{"title":"Audio GD","description":"\u003ch2 style=\"text-align: left;\"\u003eUncompromising quality\u003c\/h2\u003e  \u003cp style=\"text-align: left;\"\u003eAll Audio-GD products are designed and developed under the leadership of Mr. He Qinghua (\u0026quot;Kingwa\u0026quot;), the \u0026quot;First Prize Winner\u0026quot; of the National Semiconductor (USA) Audio Design Contest.\u003cbr\u003e\u003cbr data-mce-fragment=\"1\"\u003e With strong research and development expertise in audio technology, Audio-GD offers a complete line of Hi-Fi devices - DAC, preamplifier, and power amplifier - featuring our signature \u0026quot;Audio-GD Current Signal System\u0026quot; (ACSS) technology. \u003cbr\u003e\u003cbr\u003eOur ACCS technology transmits all audio signals in the \u0026quot;current\u0026quot; range, which provides the least coloration, most detailed, and most neutral sound. We also master advanced audio technologies such as power regeneration technology and fully balanced audio technology. Our technology is on par with internationally renowned audio equipment manufacturers.\u003c\/p\u003e  \u003cp style=\"text-align: left;\"\u003eAudio-GD has grown steadily over the years and has earned a reputation among domestic and international customers. We insist on uncompromising build quality. To ensure the highest quality, every technician at our company is not only highly experienced but also a hi-fi enthusiast.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eOur principles\u003c\/strong\u003e\u003c\/p\u003e  \u003cp style=\"text-align: left;\"\u003e1. All our products are handcrafted by experienced technicians. Quality is our top priority, without compromising on efficiency.\u003cbr\u003e\u003cbr data-mce-fragment=\"1\"\u003e 2. All our products are burned in, listened to and thoroughly tested for more than 100 hours.\u003cbr\u003e\u003cbr data-mce-fragment=\"1\"\u003e 3. All components are carefully matched to achieve the best sound.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eThe products have a 10-year repair guarantee.\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e  \u003cp\u003e  \u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003e\u003cimg style=\"display: block; margin-left: auto; margin-right: auto;\" height=\"160\" width=\"546\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/AuthorisedDealer_Audio-GD_2048x2048.png?v=1671774471\" alt=\"Audio-GD\"\u003e\u003c\/strong\u003e\u003c\/p\u003e","products":[{"product_id":"kopie-von-audio-gd-r2r-11-mk2-r2r-all-in-one-dac-amp","title":"Audio-GD R-28 2022 Edition - R2R All-in-One DAC\/Amp","description":"\u003cp\u003e\u003cstrong\u003eDelivery time on request.\u003c\/strong\u003e\u003cbr\u003e(All devices are handmade to customer order)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eFull Upgrade Version\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eincl. Metal remote control\u003cbr\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eHighlights\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eIntegrated DAC\/headphone amplifier in one device\u003c\/li\u003e\n\u003cli\u003eDigital input signal sampling Display and simulate vinyl sound\u003c\/li\u003e\n\u003cli\u003eFully balanced discrete transistor preamp and preamp in one\u003c\/li\u003e\n\u003cli\u003eBuilt-in true balanced headphone amplifier with a maximum output power of 9500mW, which can easily drive most headphones.\u003c\/li\u003e\n\u003cli\u003e8 groups of fully discrete R-2R DA modules that can be combined into true symmetrical push\/pull decoders.\u003c\/li\u003e\n\u003cli\u003e4 groups of full discrete symmetric native DSD decoders.\u003c\/li\u003e\n\u003cli\u003eFully discrete true symmetrical power transmission design.\u003c\/li\u003e\n\u003cli\u003e2pcs ultra high frequency 90\/98MHz Accusilicon 318B femtosecond clocks provide synchronous clock for the whole unit without PLL up frequency.\u003c\/li\u003e\n\u003cli\u003e32bit \/ PCM384K \/DSD512 asynchronous transmission Amanero 384 use the FPGA synchronous clock.\u003c\/li\u003e\n\u003cli\u003eThe whole digital circuit built with 1 pc FPGA and 5 pc CPLD programmable chipsets to separate the different configured circuits for avoiding interruption, data process in parallel mode.\u003c\/li\u003e\n\u003cli\u003eSupport firmware updates to improve sound quality.\u003c\/li\u003e\n\u003cli\u003eAll digital process mode settings are accessible via front panel buttons (no need to open the case).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eUnique jitter elimination technology\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eJitter has always been considered the main reason why digital systems sound quality is inferior to high-end analog systems.\u003cbr\u003e In some traditional DAC designs, the clock processing method is to follow the clock of the signal source and to restore it, and some designs also offer the possibility to reduce jitter, but with limitations when the jitter level is large.\u003cbr\u003e\u003cbr\u003e This common solution gives good measurements in laboratory tests. In practice, however, most signal sources have large jitter values, so that the resulting sound quality is not satisfactory.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cbr\u003eSpecifications\u003c\/h2\u003e\n\u003ctable class=\"auto-style3\" align=\"center\" id=\"table1908\" width=\"1028\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small; color: #000000;\"\u003eChannels imbalance\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"672\" align=\"center\"\u003e\u003cspan face=\"Arial\" color=\"#008000\" size=\"2\" style=\"color: #000000; font-family: Arial; font-size: small;\"\u003e\u003c 0.05DB\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"343\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small; color: #000000;\"\u003eFrequency Breadth\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"672\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" color=\"#008000\" style=\"color: #000000; font-family: Arial; font-size: small;\"\u003e\u003cbr\u003e20Hz - 20KHz (\u003c - 0.5DB)\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"343\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small; color: #000000;\"\u003eOutput Level\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" color=\"#008000\" style=\"color: #000000; font-family: Arial; font-size: small;\"\u003e\u003cbr\u003eHeadphone output : 19V RMS (balance)\u003cbr\u003e\u003cbr\u003ePreamp Variable output : 19V RMS (balance)\u003cbr\u003e\u003cbr\u003eDAC Fixed output : 5 V RMS (balance)\u003ct3 \u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"343\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small; color: #000000;\"\u003eHeadphone amp output power level\u003cbr\u003e(Only for headphones over 15 ohms.)\u003cbr\u003e\u003cbr\u003eBalanced mode\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small; color: #000000;\"\u003e\u003cbr\u003e\u003cspan color=\"#008000\"\u003e9500mW \/ 25 ohm\u003cbr\u003e8000MW \/ 40 ohm\u003cbr\u003e 3500MW \/ 100 ohm\u003cbr\u003e1200MW \/ 300 ohm\u003cbr\u003e600MW \/ 600 ohm\u003c\/span\u003e\u003cbr\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"343\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small; color: #000000;\"\u003e\u003cbr\u003eOutput impedance\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" color=\"#008000\" style=\"color: #000000; font-family: Arial; font-size: small;\"\u003e1 ohm \/ Headphone output\u003cbr\u003e\u003cbr\u003e5 ohm \/ DAC \/ Preamp output\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"343\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small; color: #000000;\"\u003eInput Sensitivity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" color=\"#008000\" style=\"color: #000000; font-family: Arial; font-size: small;\"\u003e\u003cbr\u003e0.5 Vp-p(75 Ohms, Coaxial)\u003cbr\u003e19 dBm (Optical)\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"343\" align=\"center\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small; color: #000000;\"\u003eSupport Operate Systems (USB)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\n\u003cbr\u003e\u003cspan lang=\"en-us\" style=\"color: #000000; font-size: small;\"\u003e\u003cspan size=\"2\" face=\"Arial\" color=\"#008000\" style=\"font-family: Arial;\"\u003eWindows, OSX, Linux, ISO\u003cbr\u003e　\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"343\" align=\"center\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small; color: #000000;\"\u003eSupport Sampling\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\u003cspan lang=\"en-us\" style=\"color: #000000; font-size: small;\"\u003e\u003cspan color=\"#008000\" size=\"2\" face=\"Arial\" style=\"font-family: Arial;\"\u003e \u003cbr\u003eUSB \u0026 IIS : 44.1kHz - 384kHz \/32Bit DSD64-512\u003cbr\u003e Coaxial mode: 44.1kHz - 192kHz\u003cbr\u003eOptical mode: 44.1kHz - 96kHz\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"343\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small; color: #000000;\"\u003ePower Requirement\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" color=\"#008000\" style=\"color: #000000; font-family: Arial; font-size: small;\"\u003e\u003cbr\u003e1 version 100-120V AC 50\/60 Hz\u003cbr\u003e\u003cbr\u003e2 version 220-240V AC 50\/60 Hz\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"343\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small; color: #000000;\"\u003ePower Consumption\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" color=\"#008000\" style=\"color: #000000; font-family: Arial; font-size: small;\"\u003e\u003cbr\u003e35W\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"343\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small; color: #000000;\"\u003ePackage Weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\u003cspan style=\"color: #000000;\"\u003e\u003cspan face=\"Arial\" size=\"2\" color=\"#008000\" style=\"font-family: Arial; font-size: small;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cspan lang=\"EN-US\"\u003eApproximately 85\u003c\/span\u003e\u003c\/span\u003e\u003cspan face=\"Arial\" color=\"#008000\" size=\"2\" style=\"font-family: Arial; font-size: small;\"\u003eKG\u003cbr\u003e　\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"343\" align=\"center\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small; color: #000000;\"\u003e\u003cbr\u003eDimensions\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\u003cspan color=\"#008000\" size=\"2\" face=\"Arial\" style=\"color: #000000; font-family: Arial; font-size: small;\"\u003eW360 X L360 X H85(MM, Fully aluminum ) \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"343\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small; color: #000000;\"\u003eAccessories\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\u003cspan face=\"Arial\" size=\"2\" color=\"#008000\" style=\"color: #000000; font-family: Arial; font-size: small;\"\u003e\u003cbr\u003eAC power cord X1\u003cbr\u003eUSB cable X1\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e.","brand":"Audio Essence","offers":[{"title":"Default Title","offer_id":42570314055869,"sku":"","price":1449.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/products\/R28211.jpg?v=1671786668"},{"product_id":"audio-gd-r-27-mkii-fully-discrete-r2r-all-in-one-dac-amp","title":"Audio-GD R-27 MKII - Fully Discrete R2R All-in-One DAC\/Amp","description":"\u003cp\u003e\u003cstrong\u003eDelivery time on request.\u003c\/strong\u003e\u003cbr\u003e(All devices are handmade to customer order)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eThe ultimate all-in-one device!\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFully balanced, fully discrete r2r ladder DAC\u003c\/li\u003e\n\u003cli\u003eFully balanced, fully discrete headphone\/preamp - \u003cbr\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eDesign overview \u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFully discrete components are used in a truly balanced power transfer design.\u003c\/li\u003e\n\u003cli\u003e4 sets of fully discrete and independent DSD hardware decoders.\u003c\/li\u003e\n\u003cli\u003e8 sets of fully discrete R-2R DA modules to form a symmetrical two-channel push-pull decoder.\u003c\/li\u003e\n\u003cli\u003e2 top-of-the-line Accusilicon TCXOs with frequencies of 90 and 98 MHz ensure synchronization of the entire device and are used for playback of all data rates without PLL upscaling.\u003c\/li\u003e\n\u003cli\u003eBoth the USB and HDMI inputs are equipped with isolators and a linear power supply that separately powers the USB and HDMI modules before the isolators to avoid interference from signal sources.\u003c\/li\u003e\n\u003cli\u003eUSB uses a two-way transmission isolator, which not only transmits IIS signals to the FPGA processor, but also receives the synchronous clock signal sent from the FPGA processor. The USB interface itself is no longer equipped with clock generators. The synchronous clock is used to make the signal transmission more accurate and raise the sound quality to an excellent level. This significantly improves the sound quality.\u003c\/li\u003e\n\u003cli\u003eThe HDMI module is now equipped with an independent isolator to improve the sound quality of the HDMI input.\u003c\/li\u003e\n\u003cli\u003eA firmware update can convert the IN2 coaxial input to an external 10MHz clock input (75 ohms).\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAll digital mode settings can be changed live on the front panel.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOn the back of the device there is a port for firmware upgrade (no need to open the cover to upgrade the firmware).\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUnique true ACSS non-reactive headphone amplifier with four channels and non-reactive output stages consisting of 8 transistors, each rated at 15A\/150W. The capacitance of the whole machine reaches up to 25,000uF. Three R-core transformers with a total power of 150W are used.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLarge output power 15W into 25ohm, 1300mW into 300ohm, which can easily drive most headphones.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMultiple information display, support user custom display information area.\u003cbr\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eUnique jitter elimination technology\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eJitter has always been considered the main reason why digital systems sound quality is inferior to high-end analog systems.\u003cbr\u003e In some traditional DAC designs, the clock processing method is to follow the clock of the signal source and to restore it, and some designs also offer the possibility to reduce jitter, but with limitations when the jitter level is large.\u003cbr\u003e\u003cbr\u003e This common solution gives good measurements in laboratory tests. In practice, however, most signal sources have large jitter values, so that the resulting sound quality is not satisfactory.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eUnique, true, feedback-free ACSS beater\/preamp technology\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eR-27 MK2 built in a true balanced design. Application of the latest ACSS design. It seems complex but in fact they are the simplest design the world has ever had, it's a lot of components to handle the power supply.The amplifier built into the R-27 MK2 has only a single \"voltage gain stage\" for signal processing, but operates in ACSS mode, so it is actually a current gain stage instead of a voltage gain stage, while normal OPA chips already contain two or three voltage gain stages in the simplest and shortest signal path produces the most neutral and least colored sound.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e The R-27 MK2 uses a single-stage, ultra-low distortion ACSS amplifier and is soldered directly to the motherboard. The amplification stages and the diamond cross output stage operate in pure Class A operation.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e ACSS is a zero-feedback technology that uses fully discrete amplifiers. Most people know that the global feedback design can perform better in test measurements, and non-feedback does not perform well in test measurements but sounds better to human ears.\u003c\/p\u003e\n\u003cp\u003eThere is a conflict between the classic circuits here. However, the ACSS opens up a new field, it can offer a less colored, more neutral sound with very low distortion and high linearity. So it can keep the dynamics, detail and neutral sound but not sound bright or harsh.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e All signal amplification is in the form of current, which is achieved by the unique excellent open-loop multi-output mirror. The result is incomparably precise and extremely low distortion of the amplification signal. The entire signal path is balanced and all transistors operate in Class A mode.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e The R-27 MK2 uses four channels with open-loop output stages consisting of 8 transistors, each rated at 15A\/150W. The capacitance of the whole device reaches up to 25,000uF. It uses four R-core transformers with a total power of 150W.\u003cbr\u003e \u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eUnique I\/V conversion volume control technology\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe volume control is also different from traditional technology. Conventional volume control technology is to implement volume control in the analog amplifier input stage through a volume potentiometer to reduce the signal.\u003c\/p\u003e\n\u003cp\u003eThe quality of the volume control directly affects the sound quality. With low quality volume control, details are lost, and imbalance of channels leads to distortion of the soundstage. Even the high power volume potentiometer, in the attenuation then gain the signal mode, still cause the detail to be lost and cause the S \/ N worst.\u003c\/p\u003e\n\u003cp\u003eOn the R-27 MK2 we have the I\/V conversion volume control, the volume control only has a variable passive I\/V conversion place at the ACSS amplifier output, where the output is the current signal, not the voltage signal. The volume control is an I\/V conversion, and the volume depends on the conversion of current (I) to voltage (V). (Like R-2R D\/A chips that output passive I\/V conversion) It can keep the signal frequency band flat and doesn't lose details. It cannot affect the sound quality at any volume level.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e The quality of the volume control is very important in the real balance gear. It must guarantee that the four channels of signal control accurately, in order to achieve the performance of the real balance gear. If the cool and hot of the balance signal can not guarantee accurate, the balance output will have large distortion, causing the sound quality and performance even much worse than a single end gear, wasting the balance gear design and cost.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e In R-27 MK2 is a four-channel digital control relay-based volume control, by changing the tolerance 0.05% resistors to avoid the volume level for the channels unbalanced, achieve the best Performance and sound quality of the device\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e R-27 MK2 have 100 steps volume control, applied supper exponential volume characteristic, easy to match the volume with different power amplifiers and speakers. while changing the volume, the various relays break or close, it can slightly changing sound had at the output and disappear while changing the volume stop.\u003c\/p\u003e\n\u003ch2\u003e\n\u003cbr\u003eSpecifications\u003c\/h2\u003e\n\u003ctable width=\"1028\" id=\"table1898\" class=\"auto-style1\" bordercolor=\"#000000\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 56px;\"\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003eS\/N Ratio\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"673\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003e\u003e120DB\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 56px;\"\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003eTHD+N\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"672\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003c0.03%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 93px;\"\u003e\n\u003ctd style=\"height: 93px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003eGain\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 93px;\" align=\"center\" width=\"673\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003eL mode : +13DB\u003cbr\u003e\u003cbr\u003eH mode : +26DB\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"343\"\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"287\"\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"387\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 56px;\"\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"314\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003eChannels imbalance\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"672\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003c 0.05DB\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 93px;\"\u003e\n\u003ctd style=\"height: 93px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003eFrequency Breadth (Whole unit)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 93px;\" align=\"center\" width=\"672\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003e20Hz - 20KHz (\u003c - 0.25DB)\u003cbr\u003e\u003cbr\u003e20Hz - 150KHz (\u003c - 3DB)\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 112px;\"\u003e\n\u003ctd style=\"height: 112px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e Output Level\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 112px;\" align=\"center\" width=\"673\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003ePreamp Variable output : 18V max (XLR) \/ 9V max (RCA)\u003cbr\u003e\u003cbr\u003eDAC Fixed output : 2-5 V (XLR) \/1-2.5V ( RCA)\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 95px;\"\u003e\n\u003ctd style=\"height: 95px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003eHeadphone amp Output Power\u003cbr\u003e (Balanced class A )\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 95px;\" align=\"center\" width=\"673\" colspan=\"2\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e25ohm: 15W\u003cbr\u003e40ohm: 10W\u003cbr\u003e100ohm: 4W\u003cbr\u003e300ohm: 1350mW\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 130px;\"\u003e\n\u003ctd style=\"height: 130px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003eHeadphone amp Output Power\u003cbr\u003e (Single-ended class A )\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 130px;\" align=\"center\" width=\"673\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e25 ohm: 4W\u003cbr\u003e\u003cbr\u003e40 ohm: 2500mW\u003cbr\u003e\u003cbr\u003e100 ohm: 1000mW\u003cbr\u003e\u003cbr\u003e300 ohm: 350mW\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 93px;\"\u003e\n\u003ctd style=\"height: 93px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003eDigital Input Sensitivity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 93px;\" align=\"center\" width=\"673\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003e0.4-1 Vp-p(75 Ohms, Coaxial)\u003cbr\u003e\u003cbr\u003e19 dBm (Optical)\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 56px;\"\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003eXLR input impedance\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"673\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003eXLR : 94K ohm\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 56px;\"\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003eSupport Operate Systems (USB)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"673\" colspan=\"2\"\u003e\n\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan lang=\"en-us\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003eWindows, OSX, Linux, ISO\u003cbr\u003e　\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 130px;\"\u003e\n\u003ctd style=\"height: 130px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003eSupport Sampling\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 130px;\" align=\"center\" width=\"673\" colspan=\"2\"\u003e\u003cspan lang=\"en-us\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e \u003cbr\u003eUSB \u0026 IIS : 44.1kHz - 384kHz \/32Bit DSD64-512\u003cbr\u003e\u003cbr\u003e AES\/EBU and Coaxial mode: 44.1kHz - 192kHz\u003cbr\u003e\u003cbr\u003eOptical mode : 44.1kHz - 96kHz\u003cbr\u003e　\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 93px;\"\u003e\n\u003ctd style=\"height: 93px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003ePower Requirement\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 93px;\" align=\"center\" width=\"673\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003e1 version 100-120V AC 50\/60 Hz\u003cbr\u003e\u003cbr\u003e2 version 220-240V AC 50\/60 Hz\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 56px;\"\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003ePower Consumption\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"673\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003e32W\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 56px;\"\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003ePackage Weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"673\" colspan=\"2\"\u003e\n\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003e\u003cspan lang=\"EN-US\"\u003eApproximately\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan lang=\"en-us\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e12\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003eKG\u003cbr\u003e　\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 56px;\"\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003eDimensions\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 56px;\" align=\"center\" width=\"673\" colspan=\"2\"\u003e\n\u003cspan\u003eW430 X L445 X H80\u003c\/span\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cspan\u003e \u003c\/span\u003e(MM) \u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 74px;\"\u003e\n\u003ctd style=\"height: 74px;\" align=\"center\" width=\"343\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003eAccessories\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 74px;\" align=\"center\" width=\"673\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\" face=\"Arial\"\u003e\u003cbr\u003eAC power cord X1\u003cbr\u003eUSB cable X1\u003cbr\u003eMetal remote X1\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cbr\u003e.","brand":"Audio Essence","offers":[{"title":"Silver","offer_id":42570369237181,"sku":"","price":2299.0,"currency_code":"CHF","in_stock":true},{"title":"Black","offer_id":42570369204413,"sku":"","price":2299.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/products\/R27RE1.jpg?v=1671788940"},{"product_id":"audio-gd-r1-fully-discrete-r2r-dac","title":"Audio-GD R1 MKIII - Fully Discrete R2R DAC","description":"\u003cp\u003e\u003cstrong\u003e1 piece silver in stock and ready to ship immediately. Otherwise: delivery time approx. 2 weeks.\u003c\/strong\u003e\u003cbr\u003e(The devices are handmade to customer order)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eHighlights\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eBuilt-in isolator for complete isolation of all inputs, including USB, HDMI, and SPDIF inputs, as well as the FPGA processor from the analog parts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFully symmetrical design of the analog parts with discrete transistors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSeparate R-core transformer power supply, integrated 7 ultra-speed linear power supplies, and two pure Class-A power supplies.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTrue symmetrical DAC design, integrated 4 groups of fully discrete, true symmetrical DSD native decoders, 8 groups of fully discrete R-2R PCM decoders, and 32-bit \/ PCM384K \/ DSD512 asynchronous transfer Amanero 384.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUSB transmits the IIS signal to the FPGA processor and receives the clock signal from the FPGA processor; the USB interface has no integrated data clocks, the signal transmission is very accurate, and the sound quality is significantly improved.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eThe FPGA processes data in parallel mode. IIS data is transmitted in serial mode, with each data transmission requiring one clock cycle for processing or transmission. A data frame (including L and R data) requires 64 clock cycles for processing or transmission, so the data is affected by the 64 clock cycles.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIn contrast, in parallel data processing and transmission mode, only one clock cycle is required to complete the processing and transmission of a data frame, avoiding the influence of clock stability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eThe IIS input (including USB and HDMI-IIS) is combined into dual 32-bit parallel data after input, the SPDIF input is combined into dual 24-bit parallel data after the decoder, and the DSD input is combined into dual 64-bit parallel data.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdvantages and disadvantages of the R-2R DAC \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003eAdvantages\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e1. The R-2R does not convert the clock signal into the output signal.\u003cbr\u003e\u003cbr\u003e2. R-2R is insensitive to jitter, while Delta-Sigma D\/A is much more sensitive to jitter.\u003cbr\u003e\u003cbr\u003e3. The output signal is much more precise compared to Delta-Sigma D\/A.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cspan style=\"text-decoration: underline;\"\u003eDisadvantages\u003cbr\u003e\u003c\/span\u003e\u003cbr\u003e1. The distortion factor is extremely good today with Sigma-Delta chips; R2R ladders are also good, but not as good.\u003cbr\u003e\u003cbr\u003e2. Disturbances and accuracy of the resistor ladder are very difficult to avoid and require complex technology to fix.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eR-2R basic design on the market\u003cbr\u003e\u003c\/strong\u003e\u003cbr\u003eThe R-2R DAC is very popular nowadays and is available from DIY kits to high-end products.\u003cbr\u003e\u003cbr\u003eIn the lower segment of the DIY market, the R-2R design often relies on old technology developed long ago by MSB and includes only the basic R2R ladder design, not the wonderful correction design of the original MSB technology. This design uses data shift register logic chips in serial mode to convert data into an analog signal. The structural problems of R2R technology cannot be avoided, and performance depends solely on the accuracy of the ladder resistors. \u003cbr\u003e\u003cbr\u003eIn the high-end market, the R2R design is much more complex and achieves the best performance. A simple R2R ladder is simply not enough to achieve good performance and sound quality! Some manufacturers use shift registers. A less complex and less powerful design based on traditional logic chips operating in serial mode to correct the ladder.\u003cbr\u003e\u003cbr\u003eA much better design switches resistors in parallel mode. An ultra-fast FPGA controls and corrects the R2R ladder. The parallel design mode controls each bit individually, achieving unprecedented performance. (In parallel mode, only 1 clock cycle is needed to output all data; the serial design mode requires at least 8 to 24 clock cycles.) The parallel design is much more complex. When properly designed, it can correct every bit of the ladder. The photo below shows a design with such an FPGA that can correct the inevitable shortcomings of R2R ladders caused by resistor tolerance and glitches to achieve the best performance.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eAccuracy of ladder resistors (tolerance)\u003cbr\u003e\u003c\/strong\u003e\u003cbr\u003eMany believe that the tolerance of the resistors in the ladder is the most important factor to achieve the best performance. Nowadays, a 24-bit resolution is standard. What tolerance is required to achieve a 24-bit resolution?\u003cbr\u003eAt 16 bits, a tolerance of 1\/65536, 0.1% (1\/1000) is far from sufficient; even a tolerance of 0.01% (1\/10000), the best tolerance available today, cannot correctly handle 16-bit requests; and we are not even considering 24 bits here!\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eThe tolerance of the resistor will never solve the imperfections of a ladder. This would require resistors with a tolerance of 0.00001% that can handle a 24-bit resolution. This is only theoretically possible, as discrete logic chips already have too high an internal impedance and would destroy the impossible tolerance of a resistor.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eThe solution is to correct the traces and not rely solely on resistor tolerance. It is a combination of both: ultra-low tolerance resistors controlled by a correction technology with a very fast FPGA are applied in our design.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eThe Importance of FPGA\/CPLD\u003cbr\u003e\u003c\/strong\u003e\u003cbr\u003eFPGA stands for Field Programmable Gate Array. Nowadays, FPGAs are used in many high-end DACs, such as the popular ROCKNA WAVEDREAM DAC. \u003cbr\u003eWe have used FPGA in our DAC products since 2008.\u003cbr\u003eThe R-7 has 1 FPGA and 5 CPLD programmable chipsets built in to separate the various configured circuits and avoid interruptions.\u003cbr\u003e\u003cbr\u003eThe internal hardware design is fully controlled by complex software. A major advantage is that the software in the FPGA can be easily upgraded to add new features or improve performance. Such a design is very flexible and future-proof!\u003cbr\u003e　\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFPGA\/CPLD Tasks\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e1. The FPGA high-performance SPDIF interface replaces traditional SPDIF interface chips like DIR9001, WM8805, or AK411X, which have lower performance compared to the FPGA.\u003cbr\u003e\u003cbr\u003e2. Complete re-clocking process with FIFO design for all inputs. This fully synchronizes output data with the clock signal to avoid any jitter.\u003cbr\u003e\u003cbr\u003e3. Built-in 2X, 4X, and 8X oversampling and digital filters plus 4 different NOS modes (only analog 6dB filtering). This lets you customize it exactly to your taste!\u003cbr\u003e\u003cbr\u003e4. Built-in special design to simulate the TDA1541A + SAA7220 sound.\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cbr\u003eSpecifications\u003c\/h2\u003e\n\u003ctable width=\"1028\" id=\"table1903\" class=\"auto-style2\" border=\"1\" align=\"center\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"343\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003eS\/N Ratio\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003e\u003cbr\u003e\u003e110dB\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"343\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003e\u003cbr\u003eOutput Impedance\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003e\u003c10 ohm (RCA\/XLR)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"343\"\u003e\n\u003cbr\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003eOutput Level\u003cbr\u003e　\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\"\u003e2.5V (RCA)\u003cbr\u003e5V (XLR)\u003cbr\u003e2mA + 2mA (ACSS)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"343\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003eFrequency Response\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"736\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003e\u003cbr\u003e20Hz - 20KHz (\u003c -0.5DB)\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"343\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\"\u003e\u003cbr\u003eTHD+N\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"736\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\"\u003e\u003c0.01%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"325\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003eInput Sensitivity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"right\" width=\"696\"\u003e\n\u003cp align=\"center\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003e\u003cbr\u003e0.5 Vp-p (75 Ohms, Coaxial)\u003cbr\u003e19 dBm (Optical)\u003cbr\u003eUSB1.0 - USB3.0\u003cbr\u003e　\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"325\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\"\u003e\u003cbr\u003eSupported Operating Systems (USB)\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"right\" width=\"696\"\u003e\n\u003cp align=\"center\"\u003e\u003cspan lang=\"en-us\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\"\u003eWindows, OSX, Linux, ISO\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"325\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\"\u003eSupported Sampling Rates\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"696\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\"\u003e\u003cspan lang=\"en-us\"\u003e \u003cbr\u003e\u003c\/span\u003e\u003cspan lang=\"en-us\"\u003e\u003cspan\u003eUSB \u0026 IIS: 44.1kHz - 384kHz \/ 32Bit DSD64-512\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e Coaxial mode: 44.1, 48, 88.2, 96, 192kHz\u003c\/span\u003e\u003cbr\u003e　\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"343\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003ePower Requirement\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\"\u003e\u003cbr\u003e Version 1: 100-120V AC 50\/60 Hz\u003cbr\u003eVersion 2: 220-240V AC 50\/60 Hz\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"343\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003ePower Consumption\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003e\u003cbr\u003e15W\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"343\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003ePackage Weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003e\u003cbr\u003e\u003cspan lang=\"EN-US\"\u003eApproximately\u003cspan\u003e 4.\u003c\/span\u003e\u003c\/span\u003e5KG\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"343\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\"\u003e\u003cbr\u003eDimensions\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\"\u003eW240 x L280 x H85 (MM, Fully aluminum) \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"343\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003eAccessories\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\"\u003e\u003cbr\u003eAC power cord X1\u003cbr\u003eUSB cable X1\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Audio Essence","offers":[{"title":"Silber","offer_id":56456818459010,"sku":null,"price":899.0,"currency_code":"CHF","in_stock":true},{"title":"Schwarz","offer_id":56456818491778,"sku":null,"price":899.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/R1MK31.jpg?v=1773150539"},{"product_id":"audio-gd-r-7he-mkii-flagship-r2r-dac","title":"Audio-GD R-7HE MKIII - Flagship R2R DAC","description":"\u003cp\u003e\u003cstrong\u003eDelivery time on request.\u003c\/strong\u003e\u003cbr\u003e(All devices are handmade to customer order)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eFlagship R2R DAC \u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003eBuilt-in regenerative power supply, fully balanced, fully discrete R2R ladder DAC.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eHighlights\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFully discrete parts are used in a truly balanced power transmission design.\u003c\/li\u003e\n\u003cli\u003e4 sets of fully discrete and independent DSD hardware decoders.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e8 sets of fully discrete R-2R DA modules to form a two-channel symmetric push-pull decoder.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2 top quality Accusilicon TCXOs with frequencies of 90 and 98 MHz ensure synchronization of the entire device and are used for playback of all data rates without PLL upscaling.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e32bit \/ 384K asynchronous Amanero USB interface synchronized with the FPGA. USB and HDMI modules are equipped with galvanic isolators and powered by two groups of independent isolated power supplies to avoid mutual electrical contamination between USB and HDMI.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eUsing the latest discrete servo-stabilized power supplies, whose performance is comparable to that of batteries after more than a year of calibration and optimization for every part of the circuit.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThe digital circuitry uses these new discrete, servo-stabilized power supplies, while the clock and analog circuitry continue to be powered by pure Class A power supplies for the best sound, as determined by listening tests.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThe digital circuitry of the entire DAC consists of an FPGA and 7 CPLDs (both programmable devices), which allow to separate the different functional circuits and avoid interference.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThe FPGA operates in parallel data processing mode, even at the fastest data rate, and supports firmware upgrades to improve sound quality as new and better design ideas are found and implemented.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThe sampling rate of the input signal is displayed.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSupport 10MHz external clock input (default: 50 ohms, can be adjusted to 75 ohms).\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAll digital mode settings can be changed directly on the front panel.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThere is a port for firmware upgrade on the back of the device (no need to open the cover to upgrade the firmware).\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eFeatures of the R-7HE MK2\u003c\/h2\u003e\n\u003cp\u003eIt has been 4 years since the launch of the R-7HE in 2017. Thanks to the R-7HE's fully programmable circuitry, we've continuously updated the firmware to improve the owner's experience.\u003c\/p\u003e\n\u003cp\u003eWe will continue to update the current R-7HE even though we are now launching a new hardware design with the R-7HE MK2. The R-7HE MK2 was designed and tested in early 2020, followed by a year of continuous listening, software and hardware tuning. Productions and sales were not planned until we were completely satisfied with the realistic sound. The improvement compared to the previous generation is quite obvious.\u003c\/p\u003e\n\u003cp\u003e1. By using the latest discrete, servo-stabilized power supply to power the digital circuitry, the noise level is comparable to that of a battery but without its dry and thin sonic characteristics, so the product's operating temperature is significantly lower than the previous model. The clock circuit and the analog circuit are still powered by a pure regulated Class A power supply to achieve the best sound results (New Upgrade)\u003c\/p\u003e\n\u003cp\u003e2.Through listening and studying the sound of a turntable for a long time, we managed to integrate the characteristics of analog vinyl sound into this product, which is optionally possible via the front panel (New feature)\u003c\/p\u003e\n\u003cp\u003e3. Both the USB and HDMI inputs are equipped with isolators and two sets of linear power supplies that separately power the USB and HDMI modules before the isolators to avoid interference from signal sources.\u003c\/p\u003e\n\u003cp\u003eUSB uses a two-way transmission isolator, which not only transmits the IIS signals to the FPGA processor, but also receives the synchronous clock signal sent by the FPGA processor. The USB interface itself is no longer equipped with clock generators. The synchronous clock is used to make the signal transmission more accurate and raise the sound quality to an excellent level. The sound quality is now actually better than the previous generation R-7HE, which was powered by the DI-20 (though not quite as good as the DI-20HE). The HDMI module is now equipped with an independent isolator to improve the sound quality of the HDMI input.\u003c\/p\u003e\n\u003cp\u003e4. Display of the function for the sampling rate of the input signal.\u003c\/p\u003e\n\u003cp\u003e5. The 10MHz clock input allows the use of an external clock.\u003c\/p\u003e\n\u003cp\u003e6. The FPGA works in parallel data processing mode. The IIS signal is a serial data transmission. Each data bit requires one clock cycle. A frame of left and right channel data requires 64 clock cycles, so stability over 64 clock cycles is required.\u003c\/p\u003e\n\u003cp\u003eParallel mode only needs one clock to transfer and process the 32-bit data of the left and right channels, which greatly improves the processing speed and is less affected by the stability of the clock.\u003cbr\u003e The IIS Input data (USB and HDMI-IIS) is reorganized into two parallel 32-bit data sets as it is input. After the SPDIF signal has been demodulated, it is also passed on to the next processing stage in two parallel 24-bit data sets. DSD data is also reorganized into two groups with 64-bit parallel processing as it is input.\u003c\/p\u003e\n\u003cp\u003eAccording to listening comparisons, the parallel processing mode can make the sound clearer and more neutral, with better dynamics and a more analog flavor.\u003c\/p\u003e\n\u003cp\u003e7. The clock management of the new architecture ensures a more stable clock, which leads to higher transparency and more details.\u003c\/p\u003e\n\u003cp\u003e8. DSD uses the built-in asynchronous clock to improve timing, which significantly increases playback clarity and dynamics.\u003c\/p\u003e\n\u003cp\u003e9. SPDIF supports DOP playback.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eFully analog regenerative power supply\u003c\/h2\u003e\n\u003cp\u003eA regenerative power supply is like a private generator built into the machine. It can largely filter out the noise on the power line, provide the audio components with super-pure power, and provide the audio system and end users with a consistent and impressive bass and high-analog signal.\u003c\/p\u003e\n\u003cp\u003eIn the implementation of regenerative power supply, the 120V\/220V AC power is converted to DC power through the input regenerative transformer, which is then supplied to the regenerative waveform generator and driver through a parallel stabilized class A power supply.\u003c\/p\u003e\n\u003cp\u003eA set of symmetrical regenerative waveform generators produces an extremely low-distortion 50Hz sine wave. After a balanced gain stage and a powerful driver stage, three regenerative output transformers output a pure voltage that is stable in both amplitude and frequency.\u003c\/p\u003e\n\u003cp\u003eTwo sets of parallel regulated Class A power supplies independently power the analog output stages of the left and right channels and the digital audio parts with their various processing functions. Both the regenerative waveform generator and the driver are powered by a stabilized Class A power supply, so that their work is not affected by mains fluctuations and disturbances.\u003c\/p\u003e\n\u003cp\u003eThe Class A shunt regulator has a very high input impedance to block interference and prevent noise on the power line from entering the audio circuit and affecting the sound quality; it also avoids crosstalk of the left and right signals by the power supply, improving separation. The low output impedance has excellent linearity and speed, which also allows for an excellent design for a regulated power supply.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAudio-GD's arguments for regenerative power supply design\u003cbr\u003e\u003c\/strong\u003e\u003cbr\u003e 1. Through the internal design analysis and actual test comparison of AP SYS-2722, the pure analog regenerative sine wave generator's distortion is much lower than that of digital synthesis generators.\u003cbr\u003e\u003cbr\u003e 2, The digital drive stage can have higher power conversion efficiency, but the all-analog drive stage has more analog sound.\u003cbr\u003e\u003cbr\u003e 3. The frequency of the regenerated waveform of 400Hz has higher power conversion efficiency. However, the regenerated waveform frequency of 50Hz is farther from the sensitive range of human hearing than 400Hz, and therefore the sound quality is smoother and more natural with 50Hz.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003e\n\u003cbr\u003eSpecifications\u003c\/h2\u003e\n\u003ctable width=\"1028\" id=\"table1897\" class=\"auto-style2\" border=\"1\" data-mce-fragment=\"1\" bordercolor=\"#000000\"\u003e\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd align=\"center\" width=\"343\" data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003eS\/N Ratio\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\" data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003e120DB\u003cbr data-mce-fragment=\"1\"\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd align=\"center\" width=\"343\" data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eOutput impedance\u003cbr data-mce-fragment=\"1\"\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\" data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003e\u003c5 ohms (XLR ,RCA)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd align=\"center\" width=\"343\" data-mce-fragment=\"1\"\u003e\n\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003eOutput Level\u003cbr data-mce-fragment=\"1\"\u003e　\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\" data-mce-fragment=\"1\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003e2.5V (RCA)\u003cbr data-mce-fragment=\"1\"\u003e5V (XLR)\u003cbr data-mce-fragment=\"1\"\u003e2+2MA (ACSS)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd align=\"center\" width=\"343\" data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003eFrequency Response\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"736\" data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e20Hz - 20KHz\u003cbr data-mce-fragment=\"1\"\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd align=\"center\" width=\"343\" data-mce-fragment=\"1\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003eTHD\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"736\" data-mce-fragment=\"1\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c0.01%\u003cbr data-mce-fragment=\"1\"\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd align=\"center\" width=\"325\" data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003eInput Sensitivity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"right\" width=\"696\" data-mce-fragment=\"1\"\u003e\n\u003cp align=\"center\" data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e0.5 Vp-p ( 75 Ohms, Coaxial )\u003cbr data-mce-fragment=\"1\"\u003e19 dBm (Optical)\u003cbr data-mce-fragment=\"1\"\u003eUSB1.0 - USB3.0\u003cbr data-mce-fragment=\"1\"\u003e　\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd align=\"center\" width=\"325\" data-mce-fragment=\"1\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eSupport Operate Systems (USB)\u003cbr data-mce-fragment=\"1\"\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"right\" width=\"696\" data-mce-fragment=\"1\"\u003e\n\u003cp align=\"center\" data-mce-fragment=\"1\"\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003eWindows, OSX, Linux, ISO\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd align=\"center\" width=\"325\" data-mce-fragment=\"1\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003eSupport Sampling\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"696\" data-mce-fragment=\"1\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e \u003cbr data-mce-fragment=\"1\"\u003eUSB \/ I2S mode: 44.1kHz\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e- 384kHz\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\/32Bit\u003cbr data-mce-fragment=\"1\"\u003eUSB \/ I2S mode:DSD native 64-512\u003cbr data-mce-fragment=\"1\"\u003e AES \u0026 Coaxial mode: 44.1kHz - 192kHz \/24Bit\u003cbr data-mce-fragment=\"1\"\u003eOptical mode: 44.1kHz - 192kHz \/24Bit (Most optical sources only support up to 96K 24BIT)\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e　\u003c\/span\u003e \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd align=\"center\" width=\"343\" data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003ePower Requirement\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\" data-mce-fragment=\"1\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eVersion 1: 100-120V AC 50\/60 Hz\u003cbr data-mce-fragment=\"1\"\u003eVersion 2: 220-240V AC 50\/60 Hz\u003cbr data-mce-fragment=\"1\"\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd align=\"center\" width=\"343\" data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003ePower Consumption\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\" data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e61W\u003cbr data-mce-fragment=\"1\"\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd align=\"center\" width=\"343\" data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003ePackage Weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\" data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN-US\" data-mce-fragment=\"1\"\u003eApproximately 20\u003c\/span\u003eKG\u003cbr data-mce-fragment=\"1\"\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd align=\"center\" width=\"343\" data-mce-fragment=\"1\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eDimensions\u003cbr data-mce-fragment=\"1\"\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\" data-mce-fragment=\"1\"\u003e\u003cspan face=\"Arial\" size=\"2\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003eW430 X L450 X H123(MM, Fully aluminum ) \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd align=\"center\" width=\"343\" data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003eAccessories\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"673\" data-mce-fragment=\"1\"\u003e\u003cspan size=\"2\" face=\"Arial\" style=\"font-family: Arial; font-size: small;\" data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eAC power cord X1 (We recommend user buy the high performance power cable replace it )\u003cbr data-mce-fragment=\"1\"\u003eUSB cable X1 (Good enough for most situation)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cbr\u003e.","brand":"Audio Essence","offers":[{"title":"Silver","offer_id":42818156101821,"sku":"","price":4199.0,"currency_code":"CHF","in_stock":true},{"title":"Black","offer_id":42818156134589,"sku":"","price":4199.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/Audio-GD-R7-HE-MKIII-00.jpg?v=1683715735"},{"product_id":"audio-gd-master-9p-mk2-dual-mono-class-a-kopfhorerverstarker","title":"Audio GD Master 9P MK2 - Dual Mono Headphone Amplifier","description":"\u003cp\u003e\u003cstrong\u003eDelivery time on request.\u003c\/strong\u003e\u003cbr\u003e(All devices are handmade to customer order)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003e2 variants \u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eMaster 9PS MK2\u003c\/strong\u003e \u003cstrong\u003e(\"Smooth\") \u003cbr\u003e\u003c\/strong\u003e8 Toshiba 15A \/150W output transistors for a warm and smooth sound \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eMaster 9PN MK2 (\"Neutral\") \u003c\/strong\u003e\u003cbr\u003e8 ON Semiconductor 15A \/230W output transistors for a neutral and transparent sound\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eHighlights\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTrue balanced dual integrated mono power amp\u003c\/li\u003e\n\u003cli\u003eDual mono headphone amplifier, true balanced, class A\u003c\/li\u003e\n\u003cli\u003e70W+70W @ 8 ohms ,14W+14W @ 40 ohms\u003c\/li\u003e\n\u003cli\u003eHeadphone output options with neutral and simulated vacuum sound for customer selection on front panel\u003c\/li\u003e\n\u003cli\u003eACSS amplifier without negative feedback\u003c\/li\u003e\n\u003cli\u003e5 group inputs\u003c\/li\u003e\n\u003cli\u003e\"Linear Fidelity\" technology\u003c\/li\u003e\n\u003cli\u003eSoft Start Power Design\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch2\u003eAre 70W+70W enough?\u003c\/h2\u003e\n\u003cp\u003eThe Master 9P MK2 is 70W+70W into 8 ohms, even at 60W output the THD+N is still low at 0.055% at 1KHz and 0.004% at 20KHz, much lower than some 60W output amps, but the Specify 150W maximum power.\u003cbr\u003e\u003cbr data-mce-fragment=\"1\"\u003e Normally with transistor power amplifiers it is recommended that the actual output power is about 1\/5 to 1\/3 of the maximum output power to keep the distortion as low as possible, so the Master 9P MK2 does the same can work well like some 200W power amplifiers.\u003cbr\u003e\u003cbr data-mce-fragment=\"1\"\u003e For the home audio system, if the speaker with less than 86DB sensitivity, the listening room is generally around 20 square meters, if the listening room is larger, the speaker has generally higher than 88DB sensitivity, for these situations, 1W\/each channel average power can already boost the speaker for normal listening, even with the really loud listening, 5W\/each channel average power can already boost n ahe 100DB on the 88DB sensitivity speakers. In that case, the Master 9P MK2 still has 14 times the reserve power. Of course there is no doubt for driving a headphone.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cbr data-mce-fragment=\"1\"\u003eTrue dual mono construction\u003c\/h2\u003e\n\u003cp\u003eFully symmetrical design, the amplification stages and pre-stages work in class A, built with discrete analog stages without OPA or coupling caps in the signal channels.\u003c\/p\u003e\n\u003cp\u003eThe output transistor stages are very linear, they sound like a pure Class A design, but without the high heat generation of the pure Class A design.\u003cbr data-mce-fragment=\"1\"\u003eUses 8 pieces ON Semiconductor transistors, each piece has a power of 15A\/230W (Master 9P MK2N). Supports 70W X2 (8 ohms) output, 14W X2 (40 ohms).\u003cbr data-mce-fragment=\"1\"\u003eThe capacitance of the whole machine reaches as high as 100,000uF, with two circuit cores in a total of 600W power, which is larger than some 200W power amplifiers.\u003c\/p\u003e\n\u003cp\u003eA total of 4 groups of high-quality Class A parallel circuits supply the amplification stages.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTwo gain modes with 100 levels exponent character volume control, high gain has 34DB, low gain has 20DB, no problem drive any high or low sensitivity headphones and speakers.\u003c\/li\u003e\n\u003cli\u003e5 groups input: RCA X2, XLR X2, ACSS X1\u003c\/li\u003e\n\u003cli\u003eSpeaker output *1 pair\u003c\/li\u003e\n\u003cli\u003eHeadphone amp output: 3pins XLR X2 \/ 4pins XLR X1 \/6.3MM X1\u003c\/li\u003e\n\u003cli\u003eHeadphone output options with neutral and simulated vacuum sound for customer selectable on front panel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr data-mce-fragment=\"1\"\u003eThe non-negative feedback output stages were equipped with the \"\u003cstrong\u003eLinear Fidelity\u003c\/strong\u003e\" technology:\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e With the Master 9P MK2, the \"Linear Fidelity\" technology was applied to the output stages . The power amps have no negative feedback but are able to keep distortion low and smooth and have excellent linear performance.\u003cbr data-mce-fragment=\"1\"\u003e In some power amp designs, distortion is very different at different power levels Even at a single power level, distortion is very different across the frequency band, especially at the low and high frequencies.\u003cbr\u003e\u003cbr data-mce-fragment=\"1\"\u003e The blue line of the graph below shows the distortion as a function of frequency at 8 ohms and 20W output power of a well-known power amplifier worth approx. USD10k.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eCurrent Conveyor Technology\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCore\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e The Master-9P is a true balanced design utilizing the latest ACSS design that can enhance the XLR connection to be just as good sounds like the ACSS connection. It seems complex but in reality they are the simplest design the world has ever had, it's a lot of components to handle the power supply.\u003c\/p\u003e\n\u003cp\u003eThe Master 9P power stage has only a single \"voltage gain stage\" for signal processing, but works in ACSS mode, so it is actually a current gain stage instead of a voltage gain stage, while normal OPA chips already contain two or three voltage gain stages . The simplest and shortest signal path produces the most neutral and least colored sound.\u003c\/p\u003e\n\u003cp\u003eThe Master-9P uses an ultra-low-distortion single-stage ACSS amplifier soldered directly to the motherboard. The amplification stages and pre-stages work in class A.\u003c\/p\u003e\n\u003cp\u003eThe output transistor stages work with a high quiescent current. The diamond cross output stage design can avoid \"switch distortion\" as well as the class A amplifier.\u003c\/p\u003e\n\u003cp\u003eACSS is a non-feedback technology with fully discrete amplifiers. Most people know that the global feedback design can perform better in test measurements, while the no-feedback design does not perform well in test measurements but offers better sound to human ears. Here there is a conflict between the classic circuits. However, the ACSS opens up a new field as it can offer a less colored, more neutral sound with very low distortion and high linearity. So it can keep the dynamics, detail and neutral sound but not sound bright or harsh.\u003c\/p\u003e\n\u003cp\u003eAll signal amplification is in the form of current, which is achieved by the unique excellent open-loop multi-output mirror. The result is incomparably precise and extremely low distortion of the amplification signal. The entire signal path is balanced and all transistors operate in Class A mode.\u003c\/p\u003e\n\u003cp\u003eThe ACSS devices use 4 groups of high-quality Class A parallel switching power supplies for the dedicated DC power supply. The class A parallel switching power supply has a very high input impedance to prevent pulses from the power supply from affecting the gain stages and a low output impedance with very high speed and high linearity, making it a very clean power supply.\u003cbr\u003e\u003ct3 \u003e\u003cstrong\u003eDrives\u003cbr\u003e\u003c\/strong\u003e\u003cbr\u003e The massive use of high-performance parts and the robust power supply guarantee a powerful current output that will drive most existing loudspeakers.\u003cbr\u003e The Master-9P uses four channels with non-feedback output stages, consisting of 8 ON Semiconductor transistors. Each piece has an output of 15A\/230W. The capacitance of the whole machine reaches up to 100,000uF. Two transformers with a total power of 600 W are used.\u003cbr\u003e \u003cbr\u003e\u003cstrong\u003eImpedance matching\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThere are many different DACs in the world that have different design and output impedance.\u003c\/p\u003e\n\u003cp\u003eIn order to avoid the effects of the different output impedances of the DACs on the sound quality, in the Master 9 4 groups of expensive single-polarity class A FET cascode buffers were built into the input. All input signals passing through these FET buffers have a very low output impedance, even if the source has high or low output impedance.\u003c\/p\u003e\n\u003cp\u003eThe FET buffers operate in pure Class A condition and have such short signal paths that they can keep the sound quality without discoloration, dry and harsh.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eVolume control\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe volume control is also different from traditional technology. Conventional volume control technology is to implement volume control in the analog amplifier input stage through a volume control to reduce the signal. The quality of the volume control directly affects the sound quality. With low quality volume control, details are lost, and imbalance of channels leads to distortion of the soundstage. Even the high power volume controls still cause the detail to be lost.\u003c\/p\u003e\n\u003cp\u003eRegardless of the quality of the volume control, the S\/N must be the worst.\u003cbr\u003e But in the Master 9P MK2 we have the I \/ V conversion volume control, the volume control only has a variable passive I \/ V conversion place at the ACSS amplifier output, where the output is the current signal, not the voltage signal. The volume control is an I\/V conversion, and the volume depends on the conversion of current (I) to voltage (V). (Like R-2R D\/A chips that output passive I\/V conversion) It can keep the signal frequency band flat and doesn't lose details. It cannot degrade the sound quality at any volume. According to the volume, there are four groups diamond non-feedback buffer output stages, provide the very low output impedance.\u003c\/p\u003e\n\u003cp\u003eThe quality of the volume control is very important in the real balance gear. It must guarantee the four channels signal control accurate to achieve the performance of the real balance gear. If the cool and hot of the balance signal can not guarantee accurate, the balance output has large distortion will cause the sound quality and performance even worse than a single end gear wasting the balance gear design and cost.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003e Specifications\u003c\/h2\u003e\n\u003ctable id=\"table1884\" width=\"1028\" border=\"1\" data-mce-fragment=\"1\" bordercolor=\"#216D94\"\u003e\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\u003ctr style=\"height: 33px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003ctd style=\"height: 33px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003eS\/N Ratio\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 33px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e\u003e110DB (Full scale)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 53px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 53px;\"\u003e\n\u003ctd style=\"height: 53px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 53px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003eGain\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 53px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 53px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e34 DB\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e(high gain)\u003cbr data-mce-fragment=\"1\"\u003e20DB (low gain)\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 53px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 53px;\"\u003e\n\u003ctd style=\"height: 53px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 53px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e Output\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e(Speaker)\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 53px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 53px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e70W*2 @ 8ohm\u003cbr data-mce-fragment=\"1\"\u003e100W*2 @ 4ohm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 131px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 131px;\"\u003e\n\u003ctd style=\"height: 131px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 131px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e Output\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e(Headphone)\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 131px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 131px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e35\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003eW*2 @\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e15\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003c\/span\u003eohm\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e20\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003eW*2 @\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e25\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003c\/span\u003eohm\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e14\u003c\/span\u003eW *2 @\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e40\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003c\/span\u003eohm\u003cbr data-mce-fragment=\"1\"\u003e6\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003eW\u003c\/span\u003e*2 @\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e100\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003c\/span\u003eohm\u003cbr data-mce-fragment=\"1\"\u003e2\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003eW*2 @ 300 ohm\u003cbr data-mce-fragment=\"1\"\u003e1W *2 @ 600 ohm\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 72px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 72px;\"\u003e\n\u003ctd style=\"height: 72px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 72px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003eInput sensitivety\u003cbr data-mce-fragment=\"1\"\u003e　\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 72px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 72px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e0.55V RMS @ XLR\u003cbr data-mce-fragment=\"1\"\u003e2mA RMS @ ACSS\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 72px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 72px;\"\u003e\n\u003ctd style=\"height: 72px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 72px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003eInput impedance\u003cbr data-mce-fragment=\"1\"\u003e　\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 72px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 72px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e47K ohms @ RCA\u003cbr data-mce-fragment=\"1\"\u003e94K ohms @ XLR\u003cbr data-mce-fragment=\"1\"\u003e\u003c10 ohms @ ACSS\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 959px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 959px;\"\u003e\n\u003ctd style=\"height: 959px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 959px;\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003eTHD+Noise\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 959px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 959px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003eTHD+N at 8 ohms 20W (\u003c0.055% at 1K, \u003c0.002% at 20KHz\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e, 2VRms XLR input\u003c\/span\u003e)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ca href=\"http:\/\/www.audio-gd.com\/Master\/Master9P\/M9P20W8R.JPG\" data-mce-fragment=\"1\" data-mce-href=\"http:\/\/www.audio-gd.com\/Master\/Master9P\/M9P20W8R.JPG\"\u003e\u003cimg height=\"426\" width=\"667\" src=\"http:\/\/www.audio-gd.com\/Master\/Master9P\/M9P20W8Rs.JPG\" border=\"0\" data-mce-fragment=\"1\" data-mce-src=\"http:\/\/www.audio-gd.com\/Master\/Master9P\/M9P20W8Rs.JPG\"\u003e\u003c\/a\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003eTHD+N at 8 ohm 60W (\u003c0055% at 1K, \u003c0.005% at 20KHz\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e, 2VRms XLR input\u003c\/span\u003e )\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003ca href=\"http:\/\/www.audio-gd.com\/Master\/Master9P\/M9P60W8R.JPG\" data-mce-fragment=\"1\" data-mce-href=\"http:\/\/www.audio-gd.com\/Master\/Master9P\/M9P60W8R.JPG\"\u003e\u003cimg height=\"419\" width=\"669\" src=\"http:\/\/www.audio-gd.com\/Master\/Master9P\/M9P60W8Rs.JPG\" border=\"0\" data-mce-fragment=\"1\" data-mce-src=\"http:\/\/www.audio-gd.com\/Master\/Master9P\/M9P60W8Rs.JPG\"\u003e\u003c\/a\u003e\u003cbr data-mce-fragment=\"1\"\u003e　\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 208.635px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 208.635px;\"\u003e\n\u003ctd style=\"height: 208.635px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 208.635px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003eFrequency Breadth (ACSS input)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 208.635px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 208.635px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e \u003ca href=\"http:\/\/www.audio-gd.com\/Master\/Master9P\/M9PFR1W8R.JPG\" data-mce-fragment=\"1\" data-mce-href=\"http:\/\/www.audio-gd.com\/Master\/Master9P\/M9PFR1W8R.JPG\"\u003e\u003cimg align=\"right\" height=\"415\" width=\"661\" src=\"http:\/\/www.audio-gd.com\/Master\/Master9P\/M9PFR1W8Rs.JPG\" border=\"0\" data-mce-fragment=\"1\" data-mce-src=\"http:\/\/www.audio-gd.com\/Master\/Master9P\/M9PFR1W8Rs.JPG\"\u003e\u003c\/a\u003e\u003c\/span\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e\u003c2.5DB at 200KHz (8 ohm 1W output, 2VRms XLR input)\u003c\/span\u003e\u003c\/span\u003e\u003ct4 \u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 56px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 56px;\"\u003e\n\u003ctd style=\"height: 56px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 56px;\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eChannels cross\u003cbr data-mce-fragment=\"1\"\u003e𩇕\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 56px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 56px;\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e\u003e-120DB\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 56px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 56px;\"\u003e\n\u003ctd style=\"height: 56px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 56px;\"\u003e\n\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003eChannels imbalance\u003cbr data-mce-fragment=\"1\"\u003e𩇕\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 56px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 56px;\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e\u003c 0.05DB\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 53px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 53px;\"\u003e\n\u003ctd style=\"height: 53px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 53px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003ePower Requirement\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 53px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 53px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e1 version 100-120V AC 50\/60 Hz\u003cbr data-mce-fragment=\"1\"\u003e2 version 220-240V AC 50\/60 Hz\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 33px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003ctd style=\"height: 33px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003ePower Consumption\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 33px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e5\u003c\/span\u003e0W static @240V or 120V\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 33px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003ctd style=\"height: 33px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003eTransformer Power\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 33px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e600W (\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e2\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003c\/span\u003etransformers)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 33px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003ctd style=\"height: 33px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003ePackage Weight\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 33px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN-US\" data-mce-fragment=\"1\"\u003eApproximately\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e21\u003c\/span\u003eKG\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 33px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003ctd style=\"height: 33px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003eProduct\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eWeight\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 33px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan lang=\"EN-US\" data-mce-fragment=\"1\"\u003eApproximately\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan lang=\"en-us\" data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e18\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003eKG\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 56px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 56px;\"\u003e\n\u003ctd style=\"height: 56px;\" width=\"343\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 56px;\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eDimensions\u003cbr data-mce-fragment=\"1\"\u003e𩇕\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 56px;\" width=\"673\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 56px;\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003eW430 X L485 X H123 (MM, Fully aluminum )\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 33px;\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003ctd style=\"height: 33px;\" width=\"314\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003eAccessories\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"height: 33px;\" width=\"668\" align=\"center\" data-mce-fragment=\"1\" data-mce-style=\"height: 33px;\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan style=\"font-size: small;\" size=\"2\" data-mce-fragment=\"1\" data-mce-style=\"font-size: small;\"\u003ePower cord X1\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e.","brand":"Audio Essence","offers":[{"title":"Master 9PS MK2 (\"Smooth\")","offer_id":42570708910269,"sku":"","price":2199.0,"currency_code":"CHF","in_stock":true},{"title":"Master 9PN MK2 (\"Neutral\")","offer_id":42570708943037,"sku":"","price":2199.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/products\/Audio-GD-Master-9P-MK2-00.jpg?v=1671808262"},{"product_id":"he9-mkii-flagship-kopfhorerverstarker","title":"HE9-MKIII - Flagship Headphone Amplifier","description":"\u003cp\u003e\u003cstrong\u003eDelivery time upon request.\u003c\/strong\u003e\u003cbr\u003e(All devices are handmade to customer order)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eHighlights\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRegenerative power supply works as a dedicated power generator\u003c\/li\u003e\n\u003cli\u003eTrue symmetrical ACSS Pure Class-A headphones and preamplifier\u003cbr\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat's new with the HE-9 MKIII?\u003c\/h2\u003e\n\u003cp\u003eAfter 5 years and long-term tests and trials, we are ready to release the new version, featuring perfect layout technology, obviously improved sound quality, better detail and dynamics, but more analog sound, no longer harsh, and the functions are also updated:\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eThe preamplifier output has exclusive output buffers built in that can improve the sound quality of the preamplifier output.\u003c\/li\u003e\n\u003cli\u003eIt has dual volume control that can match well with different output level sources.\u003c\/li\u003e\n\u003cli\u003eThe new design uses the same board for the left and right channels, making the design exactly the same so that we can measure and adjust the boards for assembly in one unit to ensure consistency.\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUnique fully analog regenerative power technology built like a private power generator, providing the cleanest power supply, enhancing sound quality with more transparency, but analog, much better than external digital technology power processors, not to mention passive LC power filter sockets.\u003c\/li\u003e\n\u003cli\u003eUnique true feedback-free ACSS spotlight applies four channels of feedback-free output stages consisting of 8 transistors, each with 15A\/150W power. The total machine capacity reaches up to 60,000uF. Four R-core transformers with a total power of 260W are used.\u003c\/li\u003e\n\u003cli\u003eThe preamplifier output has exclusive output buffers built in that can improve the sound quality of the preamplifier output.\u003c\/li\u003e\n\u003cli\u003eSeparate Class-A power supplies supply the regenerative drivers and the audio signal amplifiers.\u003c\/li\u003e\n\u003cli\u003eDigital four-channel volume controller with 100 relay-based steps avoids channel imbalance and improves sound quality.\u003c\/li\u003e\n\u003cli\u003eFour-channel 9-step digitally controlled, relay-based pre-volume control can adjust the source input level from 0dB to -9dB.\u003c\/li\u003e\n\u003cli\u003eTwo gain modes, high gain has 20dB and low gain has 10dB, providing more flexibility for different gain power stages.\u003c\/li\u003e\n\u003cli\u003e5 analog inputs: RCA x2, XLR x2, ACSS x1 (even with RCA or XLR inputs, the output still has ACSS available)\u003c\/li\u003e\n\u003cli\u003e3 preamplifier outputs: XLR \/ RCA \/ ACSS\u003c\/li\u003e\n\u003cli\u003e4 headphone amplifier outputs: 6.3MM \/ 4-pin XLR \/ 3-pin XLR *2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eDetail of the Current Conveyor Technology\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eUnique fully analog regenerative power technology:\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e While audio is life, power supply is water. Pure water creates wonderful life, clean power supply reproduces wonderful sound.\u003cbr\u003e\u003cbr\u003e The regenerative power supply is built into the device like its own electric generator. It can block most disturbances from the power line, provides ultra-clean power for the audio amplifiers, and reproduces the most neutral and analog sound of the audio signal for the system and users.\u003cbr\u003e\u003cbr\u003e In regenerative power supply, the alternating current is converted into direct current via the regenerative input transformer and forwarded to the regenerative wave generator and driver stages through the Class-A power supplies.\u003cbr\u003e\u003cbr\u003e A balanced regenerative wave generator produces an extremely low distortion 50 Hz wave, which is passed through the compensation amplifiers and the strong output stages. The regenerative transformers generate a clean AC power supply fed into the separate Class-A power supplies for the L and R channel preamplifiers.\u003cbr\u003e\u003cbr\u003e The Class-A parallel PSU has a very high input impedance to avoid interference from the PSU affecting the signal parts and a low output impedance with very fast speed and high linearity; it is a very clean power supply.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cbr data-mce-fragment=\"1\"\u003eUnique true non-feedback ACSS non-feedback\/preamplifier technology\u003c\/h2\u003e\n\u003cp\u003eThe HE-9 MK2 was built in a truly balanced design using the latest ACSS design. It seems complex, but in fact, it is the simplest design the world has ever had, with many components to handle the power supply.\u003c\/p\u003e\n\u003cp\u003eThe amplifier built into the HE-9 MK2 has only a single \"voltage gain stage\" for signal processing but operates in ACSS mode, so it is actually a current gain stage instead of a voltage gain stage, while normal OPA chips already contain two or three voltage gain stages. The simplest and shortest signal path produces the most neutral and least colored sound.\u003c\/p\u003e\n\u003cp\u003eThe HE-9 MK2 uses an ultra-low distortion single-stage ACSS amplifier that is directly soldered onto the main board. The gain stages and the diamond cross output stage operate in pure Class-A mode.\u003c\/p\u003e\n\u003cp\u003eACSS is a non-feedback technology that works with fully discrete amplifiers. Most people know that global feedback designs can deliver better values in test measurements, and that non-feedback does not perform well in tests but offers better sound for human ears.\u003c\/p\u003e\n\u003cp\u003eThere is a conflict here between classic circuits. However, ACSS opens a new field as it can offer a less colored, more neutral sound with very low distortion and high linearity. Thus, it can maintain dynamics, detail, and neutral sound without sounding bright or harsh.\u003c\/p\u003e\n\u003cp\u003eThe entire signal amplification is done in the form of current, achieved through the unique, excellent open-loop multiple output mirror. The result is an incomparably precise and extremely low distortion of the amplification signal. The entire signal path is symmetrical and all transistors operate in Class-A mode.\u003c\/p\u003e\n\u003cp\u003eThe HE-9 MK2 uses four channels with non-feedback output stages consisting of 8 transistors, each with a power of 15A\/150W. The total device capacitance reaches 60,000uF. Four R-core transformers with a total power of 260 W are used.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eUnique I\/V conversion volume control technology\u003c\/h2\u003e\n\u003cp\u003eAlso, the volume control differs from conventional technology. Conventional volume control technology implements volume control in the analog amplifier input stage by a volume potentiometer to reduce the signal. The quality of the volume control directly affects sound quality. Low-quality volume controls lose details, and channel imbalance causes soundstage distortion. Even high-performance volume potentiometers, in attenuation then gain signal mode, still cause detail loss and result in the worst S\/N ratio.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e In the HE-9 MK2, we have the I\/V conversion volume control; the volume control is just a variable passive I\/V conversion placed at the ACSS amplifier output, where the output is a current signal, not a voltage signal. The volume control is an I\/V conversion, and the volume depends on converting current (I) into voltage (V). (Like R-2R D\/A chips that output a passive I\/V conversion) It can keep the signal frequency band flat and lose no details.\u003c\/p\u003e\n\u003cp\u003eIt does not degrade sound quality at any volume. After the volume control, there is a diamond cross output stage providing very low output impedance.\u003cbr\u003e The quality of volume control is very important in real balanced gear.\u003c\/p\u003e\n\u003cp\u003eIt must guarantee that the four-channel signal control precisely achieves the real balance gear performance. If the cold and hot balance signals cannot be guaranteed accurately, the balanced output will cause large distortion, making the sound quality and performance even worse than a single-ended gear, wasting the balanced gear design and cost.\u003c\/p\u003e\n\u003cp\u003eIn HE-9 MK2, a four-channel digital control relay-based volume control is applied, changing the tolerance of 0.05% resistors to avoid volume imbalance between channels, achieving the best performance and sound quality of the control gear.\u003c\/p\u003e\n\u003cp\u003eHE-9 MK2 has 100-step volume control, applying a Super Exponential Volume characteristic, easily matching the volume with different power amplifiers and speakers. During volume changes, the various relays break or close, which can cause slight tone changes at the output that disappear when volume adjustment stops.\u003c\/p\u003e\n\u003ch2\u003eShielding\u003c\/h2\u003e\n\u003cp\u003eHE-9 MK2 has complete separation of the left and right amplifier channels, regenerative drivers and transformer, and even the 230V \/ 120V power input lines are shielded within the two thick aluminum plates.\u003c\/p\u003e\n\u003cp\u003eThe HE-9 MK2 uses a heavy full aluminum case to prevent the transformer's eddy currents from interfering with the circuit board.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable id=\"table1885\" width=\"1028\" border=\"1\" bordercolor=\"#216D94\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eS\/N Ratio\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003e130DB\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eTHD\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd width=\"313\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003c0.0025 % \u003c\/span\u003e\u003c\/td\u003e\n\u003ctd width=\"365\" align=\"center\"\u003e\u003ca href=\"http:\/\/www.audio-gd.com\/HE\/HE9MK2\/HE9MK2THD.JPG\"\u003e\u003cimg height=\"312\" width=\"500\" src=\"http:\/\/www.audio-gd.com\/HE\/HE9MK2\/HE9MK2THDs.JPG\" border=\"0\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eTHD+N\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd width=\"313\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003c0.0025%\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd width=\"365\" align=\"center\"\u003e\u003ca href=\"http:\/\/www.audio-gd.com\/HE\/HE9MK2\/HE9MK2DNR.JPG\"\u003e\u003cimg height=\"312\" width=\"500\" src=\"http:\/\/www.audio-gd.com\/HE\/HE9MK2\/HE9MK2DNRs.JPG\" border=\"0\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eFrequency Band (XLR input)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"313\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e20Hz - 100KHz (\u003c4DB )\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"365\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003ca href=\"http:\/\/www.audio-gd.com\/HE\/HE9MK2\/HE9MK2FR.JPG\"\u003e\u003cimg height=\"312\" width=\"500\" src=\"http:\/\/www.audio-gd.com\/HE\/HE9MK2\/HE9MK2FRs.JPG\" border=\"0\"\u003e\u003c\/a\u003e\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eVolume characteristic\u003cbr\u003e　\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"313\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e100 steps Super Exponential Volume Characteristic\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"365\" align=\"center\"\u003e\n\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003ca href=\"http:\/\/www.audio-gd.com\/Master\/Master-9\/M8Svol1.JPG\"\u003e\u003cimg height=\"150\" width=\"180\" src=\"http:\/\/www.audio-gd.com\/Master\/Master-9\/M8Svol1s.JPG\" border=\"0\"\u003e\u003c\/a\u003e \u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cspan face=\"Arial\" color=\"#008000\" style=\"color: #008000; font-family: Arial;\"\u003e\u003ca href=\"http:\/\/www.audio-gd.com\/Master\/Master-9\/M8Svol3.jpg\"\u003e\u003cimg height=\"150\" width=\"173\" src=\"http:\/\/www.audio-gd.com\/Master\/Master-9\/M8Svol3s.JPG\" border=\"0\"\u003e\u003c\/a\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"343\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eHeadphone amp Output Power\u003cbr\u003e (Balanced class A )\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e25 ohm: 15W\u003cbr\u003e40 ohm: 10W\u003cbr\u003e100 ohm: 4W\u003cbr\u003e300 ohm: 1350mW\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"343\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eHeadphone amp Output Power\u003cbr\u003e (Single-ended  class A )\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e25 ohm: 4W\u003cbr\u003e\u003cbr\u003e40 ohm: 2500mW\u003cbr\u003e\u003cbr\u003e100 ohm: 1000mW\u003cbr\u003e\u003cbr\u003e300 ohm: 350mW\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eGain\u003cbr\u003e　\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eHigh gain :+20DB\u003cbr\u003eLow gain : +10DB\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eOutput Level (Max)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e9.5V @ RCA\u003cbr\u003e 19V @ XLR\u003cbr\u003e6MA @ ACSS\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eOutput Impedance\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e10 ohm @ Preamp XLR\u003cbr\u003e2 ohm @ headamp balanced output\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eInput Impedance\u003cbr\u003e　\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e94K ohm @ XLR\u003cbr\u003e\u003c5 ohm @ ACSS\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eChannels cross\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003c -130DB\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eChannel imbalance\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003c 0.01DB\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003ePower Requirement\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e1 Version 100-120V AC 50\/60 Hz\u003cbr\u003e2 Version 220-240V AC 50\/60 Hz\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003ePower Consumption\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e66W Class A @230V or 120V\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eTransformer Power\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e260W (3 unit transformers)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003ePackage Weight\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan lang=\"EN-US\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eApproximately\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e20KG\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"343\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eDimensions\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eW430 X L485 X H123 (MM, Fully aluminium ) \u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"314\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eAccessories\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003ePower cord X1\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/h2\u003e","brand":"Audio Essence","offers":[{"title":"Silver","offer_id":43326977147069,"sku":"","price":2899.0,"currency_code":"CHF","in_stock":true},{"title":"Black","offer_id":43326977179837,"sku":"","price":2899.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/Audio-GD-HE-9-MK3-00.jpg?v=1702542140"},{"product_id":"audio-gd-r-7-mkii-true-balanced-r2r-dac","title":"Audio-GD R-7 MKIII - True Balanced R2R DAC","description":"\u003cp\u003e\u003cstrong\u003eDelivery time on request.\u003c\/strong\u003e\u003cbr\u003e(All devices are handmade to customer order)\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eTrue Balanced R2R DAC \u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFully discrete components are used in a truly balanced power transfer design.\u003c\/li\u003e\n\u003cli\u003e4 sets of fully discrete and independent DSD hardware decoders.\u003c\/li\u003e\n\u003cli\u003e8 sets of fully discrete R-2R DA modules to form a two-channel symmetric push-pull decoder.\u003c\/li\u003e\n\u003cli\u003e2 top-class Accusilicon TCXOs with frequencies of 90 and 98 MHz ensure synchronization of the entire device and are used for playback of all data rates without PLL upscaling.\u003c\/li\u003e\n\u003cli\u003e32bit \/ 384K asynchronous Amanero USB interface synchronized with the FPGA. USB and HDMI modules are equipped with galvanic isolators and powered by two groups of independent isolated power supplies to avoid mutual electrical contamination between USB and HDMI.\u003c\/li\u003e\n\u003cli\u003eUsing the latest discrete servo-stabilized power supplies, whose performance is comparable to that of batteries after more than a year of calibration and optimization for every part of the circuit.\u003c\/li\u003e\n\u003cli\u003eThe digital circuitry uses these new discrete, servo-stabilized power supplies, while the clock and analog circuitry continue to be powered by pure Class A power supplies for the best sound, as verified in listening tests.\u003c\/li\u003e\n\u003cli\u003eThe digital circuitry of the entire DAC consists of an FPGA and 7 CPLDs (both programmable devices), which allow to separate the different functional circuits and avoid interference.\u003cbr data-mce-fragment=\"1\"\u003e The FPGA works in parallel data processing mode, even at the fastest data rate, and supports firmware upgrades to improve sound quality as new and better design ideas are found and implemented.\u003c\/li\u003e\n\u003cli\u003eThe sampling rate of the input signal is displayed.\u003c\/li\u003e\n\u003cli\u003eSupport 10MHz external clock input (default: 50 ohms, can be adjusted to 75 ohms).\u003c\/li\u003e\n\u003cli\u003eAll digital mode settings can be changed live on the front panel.\u003c\/li\u003e\n\u003cli\u003eA firmware upgrade port is located on the back of the device (no need to open the cover to upgrade the firmware).\u003cbr\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFeatures of the R-7 MK2\u003c\/h2\u003e\n\u003cp\u003eIt has been 4 years since the launch of the R-7 in 2017. Thanks to the R-7's fully programmable circuitry, we've continuously updated the firmware to improve the owner's experience. We will continue to update the current R-7 even as we launch a new hardware design with the R-7 MK2.\u003c\/p\u003e\n\u003cp\u003eThe R-7 MK2 was developed and tested in early 2020, followed by a year of continuous listening, software and hardware tuning. Productions and sales were not planned until we were completely satisfied with the realistic sound. The improvement compared to the previous generation is quite obvious.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e 1. Using the latest discrete servo-stabilized power supply to power the digital circuits, the noise level is comparable to that of a battery but without its dry and thin sound characteristics, so the product's operating temperature is significantly lower than the previous model. The clock circuit and the analog circuit are still powered by a pure regulated Class A power supply to achieve the best sound results (New Upgrade)\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e 2. Through listening and studying the sound of a turntable for a long time, we managed to integrate the characteristics of analog vinyl sound into this product, which is optionally possible via the front panel. (New function)\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e 3.Both the USB and HDMI inputs are equipped with isolators and two sets of linear power supplies that separately power the USB and HDMI modules before the isolators to avoid interference from signal sources\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e a) USB uses a two-way transmission isolator, which not only transmits the IIS signals to the FPGA processor, but also receives the synchronous clock signal sent from the FPGA processor. The USB interface itself is no longer equipped with clocks.\u003c\/p\u003e\n\u003cp\u003eThe synchronous clock is used to make the signal transmission more accurate and raise the sound quality to an excellent level. The sound quality is now actually better than the previous generation R-7 powered by the DI-20 (although not quite as good as the DI-20HE).\u003c\/p\u003e\n\u003cp\u003eb) the HDMI module is now equipped with an independent isolator to improve the sound quality of the HDMI input.\u003cbr\u003e\u003cbr\u003e 4. Input signal sampling rate display function.\u003cbr\u003e\u003cbr\u003e 5. The 10MHz clock input allows the use of an external clock.\u003cbr\u003e\u003cbr\u003e 6. The FPGA operates in parallel data processing mode. The IIS signal is a serial data transmission. Each data bit requires one clock cycle. A frame of left and right channel data requires 64 clock cycles, so stability over 64 clock cycles is required.\u003c\/p\u003e\n\u003cp\u003eParallel mode only needs one clock to transmit and process the 32-bit left and right channel data, which greatly improves the processing speed and is less affected by the stability of the clock.\u003c\/p\u003e\n\u003cp\u003eThe IIS input data (USB and HDMI-IIS) is reorganized into two parallel 32-bit datasets as soon as they are input. After the SPDIF signal has been demodulated, it is also passed on to the next processing stage in two parallel 24-bit data sets. DSD data is also reorganized into two groups with 64-bit parallel processing as it is input.\u003c\/p\u003e\n\u003cp\u003eAccording to listening comparisons, the parallel processing mode can make the sound clearer and more neutral, with better dynamics and a more analog flavor.\u003c\/p\u003e\n\u003cp\u003e7. The clock management of the new architecture ensures a more stable clock, which leads to higher transparency and more details.\u003c\/p\u003e\n\u003cp\u003e8. DSD uses the built-in asynchronous clock to improve timing, which significantly increases playback clarity and dynamics.\u003c\/p\u003e\n\u003cp\u003e9. SPDIF supports DOP playback.\u003c\/p\u003e\n\u003ch3\u003e\n\u003cbr\u003eThe importance of FPGA\/CPLDs\u003c\/h3\u003e\n\u003cp\u003eAn important point about FPGAs\/CPLDs is that they are programmable logic array devices. Today FPGAs are used in many high-end DAC products, such as the popular ROCKNA WAVEDREAM DAC.\u003c\/p\u003e\n\u003cp\u003eWe have used FPGA designs in DAC products since 2008. This machine consists of an FPGA and 7 CPLDs, which are the heart of the digital processing.\u003c\/p\u003e\n\u003cp\u003eThe hardware layout within the FPGA can be designed and arranged in software, allowing the hardware to be upgraded through software updates.\u003c\/p\u003e\n\u003cp\u003eThis has the advantage that this design offers a high degree of flexibility. It allows improving the sound quality, adding features and updating the product through software updates (firmware).\u003c\/p\u003e\n\u003ch3\u003e\n\u003cbr data-mce-fragment=\"1\"\u003eThe tasks of the FPGA\/CPLD\u003c\/h3\u003e\n\u003cp\u003e1. The FPGA implements a high-performance SPDIF demodulator (instead of low-power SPDIF demodulator chips such as DIR9001, WM8805, AK411X, etc...).\u003c\/p\u003e\n\u003cp\u003e2. By combining clocking and FIFO technology for data output, it can be precisely synchronized with the clock and thus avoid jitter.\u003c\/p\u003e\n\u003cp\u003e3. Built-in 2x, 4x and 8x digital filters and various NOS modes allow the user to choose the sound that best suits their personal taste.\u003c\/p\u003e\n\u003cp\u003e4 Simulate the tonality of vinyl playback with a unique design.\u003c\/p\u003e\n\u003ch3\u003e\n\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eFully discrete output stage\u003c\/h3\u003e\n\u003cp\u003eThe final stage in the signal path is the analog output stage, and the output stage has a crucial impact on the sound quality of the DAC.\u003cbr data-mce-fragment=\"1\"\u003e No matter how excellent the digital circuitry, without an excellent analog output stage design, it will the sound quality is extremely ordinary.\u003c\/p\u003e\n\u003cp\u003eThe analog output stage is connected directly behind the DA 7 module, using only through-hole components (no SMD).\u003c\/p\u003e\n\u003cp\u003eThe high-speed ACSS amplifier is used for signal amplification and processing. The ACSS amplifier is designed without negative feedback and operates in current signal mode. It does not need to repeatedly convert the signal between current and voltage like other designs.\u003c\/p\u003e\n\u003cp\u003eThe output buffer stage is a pure class A single-ended FET design, and the two groups are connected in parallel to achieve lower output impedance. All in all, the output stage operates in a pure Class A condition without any negative feedback, so it can reproduce pure and lifelike sound signals.\u003c\/p\u003e\n\u003cp\u003eThe DAC has four built-in op-amps for DC servo function, so the DAC can work without coupling capacitors, which avoids noise and coloration. No switching elements are used in the entire signal channels following the DA module to achieve the truest and purest sound quality.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cbr data-mce-fragment=\"1\"\u003eHigh performance power supply design\u003c\/h3\u003e\n\u003cp\u003e3 high-power R-core transformers with a total power of 150W and more than 40,000uF audio-grade filter capacitors ensure the purity of the power supply.\u003c\/p\u003e\n\u003cp\u003e10 sets of newly developed discrete servo-stabilized power supplies and 7 sets of ultra-high-speed linear stabilized power supplies separately power the digital circuit of this product.\u003c\/p\u003e\n\u003cp\u003eThe self-contained, parallel-regulated, 5-group Class A power supply supplies power to the regenerative power driver and each part of the analog audio system separately.\u003c\/p\u003e\n\u003cp\u003eAll power supplies feature high speed and low noise.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cbr data-mce-fragment=\"1\"\u003estructure \u003c\/h3\u003e\n\u003cp\u003eThe DAC uses 5mm thick aluminum plates to separate the digital section, the left and right channel analog sections and the transformer section to avoid mutual interference.\u003c\/p\u003e\n\u003cp\u003eEven the IEC socket in the power cord is housed in a copper shell and copper groove to avoid affecting the signal parts. \u003cbr data-mce-fragment=\"1\"\u003e The analog parts of the left and right channels are symmetrically distributed on both sides of the digital part, with the same signal path length and distance, making the sound quality smoother and more accurate.\u003c\/p\u003e\n\u003cp\u003eThe DA 7 module is built between two aluminum plates to avoid interference from other circuits. The intricate arrangement and installation method were chosen to achieve clearer and purer sound quality and expand the sound field.\u003cbr\u003e\u003c\/p\u003e\n\u003cbr\u003e\u003cbr\u003e.","brand":"Audio Essence","offers":[{"title":"Silver","offer_id":42818156593341,"sku":"","price":2999.0,"currency_code":"CHF","in_stock":true},{"title":"Black","offer_id":42818156626109,"sku":"","price":2999.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/Audio-GD-R7-HE-MKIII-01_aa157c8e-1d0e-4af6-971f-acd49c63710c.jpg?v=1683715822"},{"product_id":"audio-gd-r-8he-mk3-discrete-high-end-r2r-dac","title":"Audio-GD R-8he MK3-Discrete High-end R2R DAC","description":"\u003cp\u003e\u003cstrong\u003eDelivery time upon request.\u003cbr\u003e\u003c\/strong\u003e(All devices are handmade to customer order)\u003cstrong\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e  \u003ch2\u003eR-8HE MK3\u003cbr\u003e  \u003c\/h2\u003e  \u003cp\u003eTrue symmetrical fully discrete R2R ladder DAC m\u003cspan style=\"font-size: 0.875rem;\"\u003ewith built-in regenerative power supply.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e  \u003cul\u003e\u003c\/ul\u003e  \u003cp\u003e  \u003c\/p\u003e  \u003ch2\u003eNew features and improvements\u003cbr\u003e  \u003c\/h2\u003e  \u003cp\u003eIt's been 3 years since the R-8 was launched in 2018. Thanks to the R-8's fully programmable circuitry, we have continuously updated the firmware to improve the owner's experience.\u003c\/p\u003e  \u003cp\u003eThe R-8HE MK3 was developed and tested in the first months of 2021, followed by more than half a year of continuous listening and software and hardware fine-tuning.\u003c\/p\u003e  \u003cp\u003eThe R-8HE MK3 uses the latest discrete, servo-stabilized power supplies, whose performance is comparable to that of batteries after more than a year of calibration and optimization of every part of the circuit.\u003cbr\u003e\u003cbr\u003eThe DA sections use these new discrete servo-stabilized power supplies, the analog circuits are still powered by pure Class A power supplies to achieve the best sound, as determined by listening tests.\u003c\/p\u003e  \u003cp\u003eProduction and sales weren't planned until we were completely satisfied with the realistic sound. The improvement over the previous generation is quite obvious.\u003c\/p\u003e  \u003cp\u003e1. Completely discrete components are used in a truly balanced power transfer design. Four sets of fully discrete and independent DSD hardware decoders. \u003c\/p\u003e  \u003cp\u003eEight sets of fully discrete R-2R DA modules to form a symmetrical two-channel push-pull decoder. The DA circuits are powered by the latest discrete, servo-stabilized power supply. The noise level is comparable to that of a battery, but without the dry and thin sound characteristics, allowing the product's operating temperature to be significantly lower than that of the previous model. The analog circuits are still powered by a pure, regulated Class-A power supply for optimal sound results (new upgrade).\u003c\/p\u003e  \u003cp\u003e2. Through extensive listening and study of the sound of a turntable, we have succeeded in integrating the sound characteristics of analog vinyl into this product, which is optionally available via the front panel. (New feature)\u003c\/p\u003e  \u003cp\u003e3. Both the USB and HDMI inputs are equipped with isolators and two sets of linear power supplies that supply power to the USB and HDMI modules separately before the isolators to avoid interference from signal sources.\u003c\/p\u003e  \u003cp\u003ea, USB uses a two-way transmission isolator, which not only transmits the IIS signals to the FPGA processor, but also receives the synchronous clock signal sent by the FPGA processor.\u003c\/p\u003e  \u003cp\u003eThe USB interface itself is no longer equipped with clocks. Synchronous clocking is used to increase signal transmission accuracy and raise sound quality to an excellent level. The sound quality is now actually better than the previous generation R-8 2020, which is powered by the DI-20 (although not quite as good as the DI-20HE).\u003c\/p\u003e  \u003cp\u003eb, the HDMI module is now equipped with an independent isolator to improve the sound quality of the HDMI input.\u003c\/p\u003e  \u003cp\u003e4. Function to display the sampling rate of the input signal. (New feature)\u003c\/p\u003e  \u003cp\u003e5. The digital circuits of the entire DAC consist of an FPGA and five CPLDs (both programmable components), which allow separation of the different functional circuits and prevent interference. The FPGA operates in parallel data processing mode.\u003c\/p\u003e  \u003cp\u003eThe IIS signal is a serial data transmission.Each data bit requires one clock cycle. A frame of left and right channel data requires 64 clock cycles, so stability over 64 clock cycles is required.\u003cbr\u003e\u003c\/p\u003e  \u003cp\u003eParallel mode requires only one clock to transmit and process the 32-bit data of the left and right channels, which greatly improves the processing speed and is less affected by the stability of the clock.\u003c\/p\u003e  \u003cp\u003eThe IIS input data (USB and HDMI IIS) is reorganized into two parallel 32-bit data sets as soon as it is input. After the SPDIF signal is demodulated, it is also forwarded to the next processing stage via two parallel 24-bit data sets.\u003c\/p\u003e  \u003cp\u003eDSD data is also reorganized into two groups using 64-bit parallel processing as it is input.\u003c\/p\u003e  \u003cp\u003eAccording to listening comparisons, the parallel processing mode can make the sound clearer and more neutral, with better dynamics and a more analog taste.\u003c\/p\u003e  \u003cp\u003e6. Two world-class Accusilicon TCXOs operating at 90 and 98 MHz ensure synchronization of the entire device and are used for playback at all data rates without PLL upscaling. The new architecture's clock management design ensures a more stable clock, resulting in greater transparency and more detail.\u003c\/p\u003e  \u003cp\u003e7. DSD uses the built-in asynchronous clock to improve timing, which significantly increases the clarity and dynamics of playback.\u003c\/p\u003e  \u003cp\u003e8. SPDIF supports DOP playback.\u003c\/p\u003e  \u003cp\u003e9. All digital mode settings can be changed live on the front panel.\u003c\/p\u003e  \u003cp\u003e10. There is a firmware upgrade port on the back of the device (no need to open the cover to update the firmware).\u003c\/p\u003e  \u003cp\u003e  \u003c\/p\u003e  \u003ch2\u003eFully analog renewable power supply\u003c\/h2\u003e  \u003cp\u003eA renewable power supply is like a private generator built into the machine. It can filter out power line noise to a large extent, supplying audio components with ultra-pure power, and delivering rich and impressive bass and a high-quality analog signal to the audio system and end users.\u003c\/p\u003e  \u003cp\u003eIn the implementation of the regenerative power supply, the 120V\/220V AC is converted to DC via the regenerative input transformer, which is then delivered to the regenerative waveform generator and driver via a parallel stabilized Class A power supply.\u003c\/p\u003e  \u003cp\u003eA set of symmetrical regenerative waveform generators produces an extremely low-distortion 50 Hz sine wave. Following a symmetrical amplification stage and a powerful driver stage, three regenerative output transformers output a pure voltage that is stable in both amplitude and frequency.\u003c\/p\u003e  \u003cp\u003eTwo sets of parallel-regulated Class-A power supplies independently power the analog output stages of the left and right channels, as well as the digital audio sections with their various processing functions. Both the regenerative waveform generator and the driver are powered by a stabilized Class-A power supply, ensuring their operation is unaffected by mains fluctuations and interference.\u003c\/p\u003e  \u003cp\u003eThe Class A shunt regulator has a very high input impedance to block interference and prevent noise on the power line from entering the audio circuit and degrading sound quality; it also eliminates crosstalk generated by the left and right signals from the power supply, improving isolation.The low output impedance has excellent linearity and speed, which also allows for an excellent design for a regulated power supply. Audio-gd's\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eArguments for the design of the renewable power supply:\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003e1. Through the internal design analysis and actual test comparison of AP SYS-2722, the distortion of the pure analog regenerative sine generator is much lower than that of digital synthesis generators.\u003c\/p\u003e  \u003cp\u003e2, The digital drive stage can have higher power conversion efficiency, but the fully analog drive stage has a more analog flavor.\u003c\/p\u003e  \u003cp\u003e3. The regenerated waveform frequency of 400 Hz has higher power conversion efficiency. However, the regenerated waveform frequency of 50 Hz is farther from the sensitive range of human hearing than 400 Hz, and the sound quality is therefore softer and more natural at 50 Hz.\u003c\/p\u003e  \u003cp\u003e  \u003c\/p\u003e  \u003ch2\u003eThe advantages of the R-2R DAC:\u003c\/h2\u003e  \u003cul\u003e  \u003cli\u003eR-2R does not convert the clock signal into the output signal.\u003c\/li\u003e  \u003cli\u003eR-2R is insensitive to jitter, while Delta-Sigma is very sensitive.\u003c\/li\u003e  \u003cli\u003eThe output signal level of R-2R is more accurate than Delta-Sigma.\u003c\/li\u003e  \u003c\/ul\u003e  \u003cp\u003e  \u003c\/p\u003e","brand":"Audio Essence","offers":[{"title":"Silver","offer_id":42870372434109,"sku":"","price":2399.0,"currency_code":"CHF","in_stock":true},{"title":"Black","offer_id":42870372466877,"sku":"","price":2399.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/Audio-GD-R8-MKIII-DAC-01.jpg?v=1686307130"},{"product_id":"audio-gd-master-9-mk3-dual-mono-kopfhorerverstarker","title":"Audio-GD Master 9 MK3 - Dual Mono Headphone Amplifier","description":"\u003cp\u003e\u003cstrong\u003eDelivery time approx. 2-3 weeks. \u003cbr\u003eThe devices are manufactured on customer request.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eHighlights\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Ebrima; font-size: medium;\"\u003eTrue dual mono design ,Uses two R-core transformers  separate power supplies for the right and left channels.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Ebrima; font-size: medium;\"\u003eNon-feedback ACSS gain stage and non-feedback diamond output stage.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Ebrima; font-size: medium;\"\u003eFully balanced pure class A design built by discrete analog stages without any OPA or coupling caps in the signal channels.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Ebrima; font-size: medium;\"\u003eTotal applied 8 pcs exact matching 150W transistors ( In total 1200W ) as the output stages  for implement large class A output power.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Ebrima; font-size: medium;\"\u003eMore than 32,000uf audio grade NOVER capacitors and 4 groups pure class A PSUs power supply are used to ensure ample and smooth power delivery.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Ebrima; font-size: medium;\"\u003eFour-channel 100 steps digitally controlled relay-based volume control avoids channel imbalance and improves sound quality .\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Ebrima; font-size: medium;\"\u003e16.25DB in total 2 type gain modes can drive the low sensitivity headphone very well.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Ebrima; font-size: medium;\"\u003e4 groups input: RCA X1, XLR X2, ACSS X1\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Ebrima; font-size: medium;\"\u003e3 groups preamp output: XLR \/ RCA \/ ACSS\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-family: Ebrima; font-size: medium;\"\u003e2 groups headphone amp output: 4pins XLR X1 \/ 6.3MM X1\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003eTechnology Detail\u003c\/h2\u003e\n\u003cp\u003e             \u003cbr\u003eThe Master 9 is a true dual mono design and a true balanced design, using the latest ACSS design, which can improve the XLR connection to sound as good as the ACSS -Connection. They seem complex, but in reality they are the simplest design the world has ever had, their a lot of components to handle the power.\u003c\/p\u003e\n\u003cp\u003eThe Master 9 uses an ultra-low distortion single-stage ACSS amplifier that produces the most neutral and least colored sound with the simplest and shortest signal path. the components are soldered directly to the motherboard.\u003c\/p\u003e\n\u003cp\u003eACSS is a zero-feedback technology that uses discrete amplifiers. Most people know that the global feedback design performs better in test measurements, while the non-feedback design does not perform well in test measurements, but provides better sound to the human ear.\u003c\/p\u003e\n\u003cp\u003eThere is a conflict between the classic circuits here. However, the ACSS opens up a new field; it can offer a less colored, more neutral sound with very low distortion and high linearity. This allows it to maintain the dynamics, details and neutral sound without sounding bright or harsh.\u003c\/p\u003e\n\u003cp\u003eAll signal amplification occurs in current mode, all transistors operate in pure Class A mode.\u003c\/p\u003e\n\u003ch3\u003ePowerful Class A output stages:\u003c\/h3\u003e\n\u003cp\u003eThe Master 9 has 4 groups of diamond differential output stages as a balance drive stage, which have four pairs of 150W transistors also operating in pure Class A state.\u003c\/p\u003e\n\u003cp\u003eThe pure Class A design has a greater driving capability than the specifications, it drives the headphone no worse than a Class AB design with twice the power, not to say the pure Class A design is that best sound design worth.\u003c\/p\u003e\n\u003cp\u003eThe balance drive mode can kill the noise and distortion in the end of the headphones, much improve the soundstage, background and transparency, ect. \u003c\/p\u003e\n\u003cp\u003e              \u003c\/p\u003e\n\u003ch3\u003ePower supply:    \u003c\/h3\u003e\n\u003cp\u003eTwo dedicated transformers and 4 groups of pure Class A power supplies are used to power the left and right channels separately.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe Class A parallel switching power supply has a very high input impedance to prevent pulses through the power supply from affecting the preamplifier and a low output impedance with very high speed and high linearity, making it a very clean power supply.\u003cbr\u003e　\u003c\/p\u003e\n\u003ch3\u003eVolume control:\u003c\/h3\u003e\n\u003cp\u003eThe volume control is also different from traditional technology. Conventional volume control technology is to implement volume control in the analog amplifier input stage through a volume potentiometer to reduce the signal.\u003c\/p\u003e\n\u003cp\u003eThe quality of the volume control directly affects the sound quality, a poor quality volume control results in a loss of detail and an imbalance of channels results in soundstage distortion.\u003c\/p\u003e\n\u003cp\u003eEven the high performance volume controls still cause the detail to be lost. Regardless of the quality of the potentiometer, the S\/N must be worse.\u003c\/p\u003e\n\u003cp\u003eBut in the Master 9 we have the I\/V conversion volume control, the volume control only places a variable passive I\/V conversion at the ACSS amplifier output, where the output is the current signal, not the voltage signal.\u003c\/p\u003e\n\u003cp\u003eThe volume control is an I\/V conversion, and the volume depends on the conversion of current (I) to voltage (V). (Like R-2R D\/A chips that output passive I\/V conversion) It can keep the signal frequency band flat and does not lose details. It cannot degrade the sound quality at any volume. According to the volume, there are four groups of diamond non-feedback buffer output stages to provide the very low output impedance.\u003c\/p\u003e\n\u003cp\u003eThe quality of volume control is very important in real balance transmission. It must guarantee the four channels signal control to accurately achieve the performance of the real balance gear. If the cool and hot of the balance signal can not guarantee accurate, the balance output will have large distortion causing the sound quality and performance even much worse than a single end gear, wasting the balance gear design and the cost.\u003c\/p\u003e\n\u003cp\u003eIn Master 9, a four channel 100 steps digital control relay-based volume control is applied, switch the 0.1% resistors to guarantee accurate control for the four channels of the balance amp. While changing the volume, the various relays break or close, it may have had slightly changing tone at the output and disappear while changing the volume.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Audio Essence","offers":[{"title":"Default Title","offer_id":43848250720445,"sku":"","price":1399.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/Audio-GD-Master-9-MK3-02.jpg?v=1714464158"},{"product_id":"he9-mkiii-flagship-kopfhorerverstarker-aktion","title":"He9 -Mkiii - Flagship headphone amplifier action","description":"\u003cp\u003e\u003cb\u003e1 piece in stock and available for immediate delivery.\u003c\/b\u003e\u003c\/p\u003e  \u003ch2\u003e\u003cspan style=\"color: rgb(255, 255, 255); background-color: rgb(255, 0, 107);\"\u003eYou save CHF 500!\u003c\/span\u003e\u003c\/h2\u003e  \u003cp\u003e  \u003c\/p\u003e  \u003ch2\u003eHighlights\u003cbr\u003e  \u003c\/h2\u003e  \u003cul\u003e  \u003cli\u003eRenewable power supply works as a dedicated power generator\u003c\/li\u003e  \u003cli\u003eTrue balanced ACSS Pure Class-A headphones and preamplifier\u003cbr\u003e\u003cbr\u003e  \u003c\/li\u003e  \u003c\/ul\u003e  \u003ch2\u003eWhat's new about the HE-9 MKIII?\u003c\/h2\u003e  \u003cp\u003eAfter 5 years of long-term testing and testing, we are ready to release the new version, it apply the perfect layout technology, improve sound quality obviously, better detail and dynamic, but more analog sound, no longer harsh, and also update the functions:\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e  \u003col\u003e  \u003cli\u003eThe preamp output has built-in exclusive output buffers, which can improve the sound quality of the preamp output.\u003c\/li\u003e  \u003cli\u003eIt has dual volume control can well match with the different output level sources.\u003c\/li\u003e  \u003cli\u003eThe new design apply the same board of the left and right channels which make the design exactly the same that we can measure and adjust the boards for assembly in the one unit to ensure consistency\u003cbr\u003e  \u003c\/li\u003e  \u003c\/ol\u003e  \u003cp\u003e  \u003c\/p\u003e  \u003ch2\u003eOverview\u003c\/h2\u003e  \u003cul\u003e  \u003cli\u003eUnique fully analog regenerative power technology as built in a private power generator, which provide the cleanest power supply, increase the sound quality more transparency, but analog, much better than the external digital technology power processor, not to mention the passive LC power filter socket.\u003c\/li\u003e  \u003cli\u003eThe unique ACSS true anti-reactive power amplifier employs four channels of anti-reactive output stages, each consisting of eight transistors, each with a power rating of 15A\/150W. The entire amplifier's capacitance reaches up to 60,000uF. Four R-core transformers with a total power of 260W are used.\u003c\/li\u003e  \u003cli\u003eThe preamp output has built-in exclusive output buffers, which can improve the sound quality of the preamp output.\u003c\/li\u003e  \u003cli\u003eSeparate Class A power supplies supply the regenerative drivers and the audio signal amplifiers.\u003c\/li\u003e  \u003cli\u003eFour-channel digital volume control with 100 steps based on relays avoids channel imbalance and improves sound quality.\u003c\/li\u003e  \u003cli\u003eFour-channel 9-stage digitally controlled, relay-based pre-volume control can adjust the source input level from 0DB to -9DB.\u003c\/li\u003e  \u003cli\u003eTwo gain modes, high gain has 20DB and low gain has 10DB, which is more flexibility for different gain power amplifier.\u003c\/li\u003e  \u003cli\u003e5 analog inputs: RCA X2, XLR X2, ACSS X1 (also with RCA or XLR inputs, the output still has ACSS available)\u003c\/li\u003e  \u003cli\u003e3 preamplifier outputs: XLR \/ RCA \/ ACSS\u003c\/li\u003e  \u003cli\u003e4 headphone amplifier outputs: 6.3MM \/ 4 pins XLR \/ 3 pins XLR *2\u003c\/li\u003e  \u003c\/ul\u003e  \u003cp\u003e  \u003c\/p\u003e  \u003ch2\u003eDetail of Current Conveyor Technology\u003c\/h2\u003e  \u003cp\u003e\u003cstrong\u003eUnique fully analogue renewable power technology:\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eWhile audio is life, power is water. Pure water creates wonderful life, clean power supply reproduced wonderful sound.\u003cbr\u003e\u003cbr\u003eThe regenerative power supply is built into the device like its own electrical generator. can block most of the interference from the power line, provides ultra-clean power supply for the audio amplifiers, reproduces the most neutral and analog sound of the audio signal for the system and users.\u003cbr\u003e\u003cbr\u003eIn the regenerative power supply, the alternating current is converted to direct current via the regenerative input transformer and passed on to the regenerative wave generator and the driver stages via the Class A power supplies.\u003cbr\u003e\u003cbr\u003eA balanced regenerative wave generator produces an extremely low-distortion 50 Hz wave, which is passed through the equalizing amplifiers and the powerful output stages. The regenerative transformers produce a clean AC supply, which is fed into the separate Class A power supplies for the L and R channel preamplifiers.\u003cbr\u003e\u003cbr\u003eThe Class A parallel PSU has a very high input impedance to avoid interference from the PSU from affecting the signal parts and low output impedance with very fast speed and high linear, it is a very clean power supply.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e  \u003ch2\u003e  \u003cbr\u003eUnique true ACSS non-feedback preamplifier technology\u003c\/h2\u003e  \u003cp\u003eThe HE-9 MK2 was built in a truly balanced design using the latest ACSS design. It seems complex, but in fact, they're the simplest design the world has ever had, with their numerous components handling the power supply.\u003c\/p\u003e  \u003cp\u003eThe amplifier built into the HE-9 MK2 has only a single \u0026quot;voltage amplification stage\u0026quot; for signal processing, but operates in ACSS mode, so it's actually a current amplification stage instead of a voltage amplification stage, whereas conventional OPA chips already contain two or three voltage amplification stages. The simplest and shortest signal path produces the most neutral and least colored sound.\u003c\/p\u003e  \u003cp\u003eThe HE-9 MK2 utilizes an ultra-low-distortion, single-stage ACSS amplifier soldered directly to the main circuit board. The gain stages and diamond-cross output stage operate in pure Class A mode.\u003c\/p\u003e  \u003cp\u003eACSS is a zero-feedback technology that uses fully discrete amplifiers. Most people know that global feedback designs can deliver better results in test measurements, and that non-feedback designs don't perform well in test measurements but provide better sound to the human ear.\u003c\/p\u003e  \u003cp\u003eThis is where the classic circuits conflict. However, the ACSS opens up a new field, as it can deliver a less colored, more neutral sound with very low distortion and high linearity. This allows it to retain dynamics, detail, and neutrality, but avoid sounding bright or harsh.\u003c\/p\u003e  \u003cp\u003eAll signal amplification occurs in the form of current, achieved through the unique, outstanding open-loop multiple output mirror. The result is an incomparably precise and extremely low-distortion amplification signal. The entire signal path is symmetrical, and all transistors operate in Class A mode.\u003c\/p\u003e  \u003cp\u003eThe HE-9 MK2 uses four channels with non-feedback output stages consisting of eight transistors, each rated at 15A\/150W. The entire device's capacitance reaches 60,000uF. Four R-core transformers with a total power of 260W are used.\u003cbr\u003e\u003c\/p\u003e  \u003cp\u003e  \u003c\/p\u003e  \u003ch2\u003eUnique I\/V conversion volume control technology\u003c\/h2\u003e  \u003cp\u003eThe volume control is also different from conventional technology. Conventional volume control technology implements volume control in the analog amplifier input stage through a volume control potentiometer to reduce the signal. The quality of the volume control directly affects the sound quality. If the volume control is poor, details will be lost, and channel imbalance will lead to soundstage distortion. Even the high-power volume potentiometer, in the attenuation then gain mode, will still lead to loss of detail and cause the S\/N to be worst.\u003c\/p\u003e  \u003cp\u003e\u003cbr\u003eIn the HE-9 MK2, we have the I\/V conversion volume control, the volume control only a variable passive I\/V conversion place at the ACSS amplifier output, where the output is the current signal, not the voltage signal. The volume control is an I\/V conversion, and the volume depends on the conversion of the current (I) to the voltage (V). (Like R-2R D\/A chips that output passive I\/V conversion) It can keep the signal frequency band flat and does not lose details.\u003c\/p\u003e  \u003cp\u003eIt can maintain sound quality at any volume level. After the volume level, the diamond crossover output stage provides very low output impedance.\u003cbr\u003eThe quality of volume control is very important in real balance gear.\u003c\/p\u003e  \u003cp\u003eIt must ensure that the four-channel signal control accurately achieves the performance of the real balance gear. If the cool and hot balance signal cannot be accurately guaranteed, the balance output will have significant distortion, causing the sound quality and performance to be even worse than a single-end gear, wasting the balance gear design and reducing costs.\u003c\/p\u003e  \u003cp\u003eIn HE-9 MK2 is applied a four-channel digital control relay-based volume control, by changing the tolerance 0.05% resistors to control the volume for the channels to avoid unbalanced, achieve the best performance and sound quality of the transmission.\u003c\/p\u003e  \u003cp\u003eHE-9 MK2 have 100 steps volume control, applied supper exponential volume characteristic, easy to adjust the volume to match with different power amplifiers and speakers.during changing the volume, the different relays break or close, it may had slightly changing sound at the output and disappear while stop changing the volume.\u003c\/p\u003e  \u003ch2\u003eshielding\u003c\/h2\u003e  \u003cp\u003eHE-9 MK2 has a complete separation of the left, right amplifier channels, regenerative drivers and transformer, also the 230V \/ 120V power input lines had shield in the two thick aluminum plates.\u003c\/p\u003e  \u003cp\u003eThe HE-9 MK2 uses a heavy-duty all-aluminum chassis to prevent the transformers' eddy current from interfering with the circuit board.\u003c\/p\u003e  \u003cp\u003e  \u003c\/p\u003e  \u003ctable id=\"table1885\" width=\"1028\" border=\"1\"\u003e  \u003ctbody\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eS\/N ratio\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u0026gt;130 dB\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eTHD\u003cbr\u003e  \u003c\/span\u003e\u003c\/td\u003e  \u003ctd width=\"313\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u0026lt;0.0025% \u003c\/span\u003e\u003c\/td\u003e  \u003ctd width=\"365\" align=\"center\"\u003e\u003ca href=\"http:\/\/www.audio-gd.com\/HE\/HE9MK2\/HE9MK2THD.JPG\"\u003e\u003cimg height=\"312\" width=\"500\" src=\"http:\/\/www.audio-gd.com\/HE\/HE9MK2\/HE9MK2THDs.JPG\" border=\"0\"\u003e\u003c\/a\u003e\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eTHD+N\u003c\/span\u003e\u003c\/td\u003e  \u003ctd width=\"313\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u0026lt;0.0025%\u003c\/span\u003e\u003c\/td\u003e  \u003ctd width=\"365\" align=\"center\"\u003e\u003ca href=\"http:\/\/www.audio-gd.com\/HE\/HE9MK2\/HE9MK2DNR.JPG\"\u003e\u003cimg height=\"312\" width=\"500\" src=\"http:\/\/www.audio-gd.com\/HE\/HE9MK2\/HE9MK2DNRs.JPG\" border=\"0\"\u003e\u003c\/a\u003e\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eFrequency Band (XLR input)\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003ctd width=\"313\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e20Hz - 100KHz (\u0026lt;4dB)\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003ctd width=\"365\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003ca href=\"http:\/\/www.audio-gd.com\/HE\/HE9MK2\/HE9MK2FR.JPG\"\u003e\u003cimg height=\"312\" width=\"500\" src=\"http:\/\/www.audio-gd.com\/HE\/HE9MK2\/HE9MK2FRs.JPG\" border=\"0\"\u003e\u003c\/a\u003e\u003cbr\u003e  \u003c\/span\u003e\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eVolume characteristic\u003cbr\u003e  \u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003ctd width=\"313\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e100 steps Supper Exponential Volume Characteristic\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003ctd width=\"365\" align=\"center\"\u003e  \u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003ca href=\"http:\/\/www.audio-gd.com\/Master\/Master-9\/M8Svol1.JPG\"\u003e\u003cimg height=\"150\" width=\"180\" src=\"http:\/\/www.audio-gd.com\/Master\/Master-9\/M8Svol1s.JPG\" border=\"0\"\u003e\u003c\/a\u003e  \u003cspan\u003e  \u003c\/span\u003e\u003c\/span\u003e\u003cspan face=\"Arial\" color=\"#008000\" style=\"color: #008000; font-family: Arial;\"\u003e\u003ca href=\"http:\/\/www.audio-gd.com\/Master\/Master-9\/M8Svol3.jpg\"\u003e\u003cimg height=\"150\" width=\"173\" src=\"http:\/\/www.audio-gd.com\/Master\/Master-9\/M8Svol3s.JPG\" border=\"0\"\u003e\u003c\/a\u003e\u003c\/span\u003e  \u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"343\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eHeadphone amp output power\u003cbr\u003e (Balanced class A)\u003c\/span\u003e\u003c\/td\u003e  \u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e25 ohms: 15W\u003cbr\u003e40 ohms: 10W\u003cbr\u003e100 ohms: 4W\u003cbr\u003e300 ohms: 1350mW\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"343\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eHeadphone amp output power\u003cbr\u003e (Single-ended class A )\u003cbr\u003e  \u003c\/span\u003e\u003c\/td\u003e  \u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e25 ohms: 4W\u003cbr\u003e\u003cbr\u003e40 ohms: 2500mW\u003cbr\u003e\u003cbr\u003e100 ohms: 1000mW\u003cbr\u003e\u003cbr\u003e300 ohms: 350mW\u003c\/span\u003e\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eGain\u003cbr\u003e  \u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eHigh gain: +20 dB\u003cbr\u003eLow gain: +10 dB\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eOutput Level (Max)\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e9.5V @ RCA\u003cbr\u003e 19V @ XLR\u003cbr\u003e6MA @ ACSS\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eOutput Impedance\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e10 ohms @ Preamp XLR\u003cbr\u003e2 ohm @ headamp balanced output\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eInput impedance\u003cbr\u003e  \u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e94K ohms @ XLR\u003cbr\u003e\u0026lt;5 ohm @ ACSS\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eChannels cross\u003cbr\u003e  \u003c\/span\u003e\u003c\/td\u003e  \u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u0026lt; -130 dB\u003c\/span\u003e\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eChannel imbalance\u003cbr\u003e  \u003c\/span\u003e\u003c\/td\u003e  \u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u0026lt; 0.01 dB\u003c\/span\u003e\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003ePower requirement\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e1 version 100-120V AC 50\/60 Hz\u003cbr\u003e2 versions 220-240V AC 50\/60 Hz\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003ePower Consumption\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e66W Class A @230V or 120V\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eTransformer Power\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e260W (3 unit transformers)\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003ePackage Weight\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e  \u003cp\u003e\u003cspan lang=\"EN-US\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eApproximately\u003cspan\u003e  \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e20KG\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"343\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003e\u003cbr\u003eDimensions\u003cbr\u003e  \u003c\/span\u003e\u003c\/td\u003e  \u003ctd colspan=\"2\" width=\"673\" align=\"center\"\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eW430 X L485 X H123 (MM, fully aluminum) \u003c\/span\u003e\u003c\/td\u003e  \u003c\/tr\u003e  \u003ctr\u003e  \u003ctd width=\"314\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003eAccessories\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003ctd colspan=\"2\" width=\"668\" align=\"center\"\u003e  \u003cp\u003e\u003cspan face=\"Arial\" style=\"font-family: Arial;\"\u003ePower cord X1\u003c\/span\u003e\u003c\/p\u003e  \u003c\/td\u003e  \u003c\/tr\u003e  \u003c\/tbody\u003e  \u003c\/table\u003e  \u003ch2\u003e  \u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e  \u003c\/h2\u003e","brand":"Audio Essence","offers":[{"title":"Silver","offer_id":55137505673602,"sku":null,"price":2399.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/Audio-GD-HE-9-MK3-00.jpg?v=1702542140"},{"product_id":"audio-gd-di-25he-digital-interface-ddc","title":"Audio-GD DI-25HE-Digital Interface (DDC)","description":"\u003cp\u003e\u003cstrong\u003eDelivery time approx. 2 weeks\u003c\/strong\u003e\u003c\/p\u003e  \u003ch2\u003e  \u003cbr\u003eHighlights\u003c\/h2\u003e  \u003cul\u003e  \u003cli\u003e(Digital interface with regenerative power supply)\u003c\/li\u003e  \u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eHDMI input and Amanero USB interface, supports up to PCM384K\/DSD512\u003c\/span\u003e\u003c\/li\u003e  \u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eAccsilicon AS318B 90\/98M clock used\u003c\/span\u003e\u003c\/li\u003e  \u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e50\/75 Ohm 10 MHz inputs and outputs\u003c\/span\u003e\u003c\/li\u003e  \u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eIntegrated 10 MHz clock with 50\/75 ohm output connectors for connecting DACs\u003c\/span\u003e\u003c\/li\u003e  \u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eFully integrated isolator, isolates HDMI\/USB and clock inputs to all outputs\u003c\/span\u003e\u003c\/li\u003e  \u003c\/ul\u003e  \u003cp\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e  \u003ch2\u003eNew features of the DI-25HE\u003cbr\u003e  \u003c\/h2\u003e  \u003cp\u003e1. Integrated HDMI IIS input to which source devices with compatible HDMI IIS output can be connected.\u003cbr\u003e\u003cbr\u003e2. The HDMI input signal filters out jitter, resynchronizes clock and data, and generates the most accurate clock signal, significantly improving the sound quality of the connected source, especially for low- and mid-range devices.\u003cbr\u003e\u003cbr\u003e3. The resolution of the source's HDMI output must match the figure below and the source's MCLK signal must be below 40 MHz (most sources have a built-in 24.576 MHz clock compatible with the DI-25HE's HDMI input).\u003cbr\u003e          \u003cbr\u003e4. We tested the DI-2014 (a 10-year-old DI) and a $300 CD player, along with a few other sources, and connected them to the DI-25HE. The sound quality improved significantly, almost matching that of the DI-25HE connected directly to a MacBook Pro.\u003c\/p\u003e  \u003cp\u003e5. The new clock configuration design improves the sound quality for all inputs.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e  \u003ch2\u003eAdditional features\u003c\/h2\u003e  \u003cp\u003e1. Built-in regenerative power supply like in a private power generator, built with pure Class A power supplies and pure Class A integrated amplifiers.\u003cbr\u003e\u003cbr\u003e2. Built-in Amanero USB interface, which is the most compatible and stable. During testing, it supported WIN, OSX, IOS, and Linux, and was tested with some TV and phone models based on the Android system.\u003cbr\u003e\u003cbr\u003e3. The HDMI IIS output can set the definitions of PCM and DSD via the display menu.\u003c\/p\u003e  \u003cp\u003e\u003cimg height=\"250\" width=\"361\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/HDMIinput.jpg?v=1752064916\"\u003e\u003c\/p\u003e  \u003cp\u003e4. Built-in R-core transformer with best sound quality and 13 groups of ultra power supplies that supply the different signal parts separately.\u003c\/p\u003e  \u003cp\u003e5. The USB interface and the FPGA processor use the same clocks to avoid different clocks affecting the sound quality.\u003c\/p\u003e  \u003cp\u003e6. The FPGA data processing mode can select either parallel or serial mode. The USB output IIS data is transmitted in serial transmission mode, with each data processing or transmission requiring one clock cycle.\u003cbr\u003e\u003cbr\u003eA data frame (including L and R data) requires 64 clock cycles for processing or transmission, so the data is affected by the 64 clock cycles. In parallel data processing and transmission mode, however, only one clock cycle is required to complete the processing and transmission of a data frame, thus avoiding the influence of clock stability.\u003cbr\u003e\u003cbr\u003eThe USB data is recombined into double 32-bit parallel data after input, and the DSD input is recombined into double 64-bit parallel data after input.\u003c\/p\u003e  \u003cp\u003eThe parallel processing and transmission mode can improve sound quality in terms of transparency and detail, but still remains analog. In parallel processing mode, all data processing occurs at a clock frequency of 256 fs, unlike the conventional mode, which samples different music data at a variable clock frequency of 64 to 256 fs. The fixed clock frequency of 256 fs allows the signal to have more precise phase timing and be processed at the same timing to maintain the sound character.\u003c\/p\u003e  \u003cp\u003e7. The display can show the sampling of PCM and DSD and serves as a human-machine interface, allowing the user to change the settings in the device.\u003c\/p\u003e  \u003cp\u003e8. Integrated USB firmware update button and FPGA firmware update port, firmware update without opening the device and support for future sound quality improvements.\u003c\/p\u003e  \u003cp\u003e9. Digital data and clock signals are even more susceptible to interference during transmission than analog signals, which can lead to degraded DAC sound or even malfunction. Therefore, the DI-24HE incorporates multiple high-performance driver chips to drive the various data and clock signals, reducing the impact during transmission.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e  \u003ch2\u003ePure analogue regenerative power supply\u003c\/h2\u003e  \u003cp\u003eThe regenerative power supply is like a proprietary power generator built into the device. It can block most power line interference, supply the audio amplifiers with extremely clean power, and reproduce the most neutral and analog sound, like an audio signal, for the system and users.\u003cbr\u003e\u003cbr\u003eIn the design of the regenerative power supply, the alternating current is converted to direct current by the regenerative input transformer and provided to the regenerative wave generator and driver stages via the Class A power supplies.\u003cbr\u003e\u003cbr\u003eA symmetrical regenerative wave generator produces an extremely low-distortion 50 Hz wave, which, via symmetrical amplifiers and powerful output stages, drives the regenerative transformers that produce clean AC power for the separate Class A power supplies.\u003c\/p\u003e  \u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/HE_DACs.jpg?v=1752064916\"\u003e\u003c\/p\u003e  \u003cp\u003e  \u003c\/p\u003e  \u003ch2\u003eBuilt-in Accusilicon clocks with 90 and 98 MHz\u003c\/h2\u003e  \u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/Jitters.png?v=1752064916\" alt=\"\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/Phase_noises.png?v=1752064935\" alt=\"\"\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e  \u003ch2\u003ePlease note\u003c\/h2\u003e  \u003cp\u003eThe product has a built-in Amanero USB interface, whose USB port is well compatible with Windows, Apple OS\/iOS and computers running Linux\/Android (including PI, ROCK64, newer Android smartphones and TVs). However, we cannot guarantee that it will be compatible with the USB output of non-computer-based digital transport devices. \u003cbr\u003e\u003cbr\u003eThe DI-25HE features built-in ultra-speed isolation, completely isolating the USB and clock inputs from all outputs. No external USB isolation is required; the USB port can be connected directly to the computer.\u003cbr\u003e\u003cbr\u003eThere are many different IIS definitions from other brands that need to be set on the front panel to match the DAC IIS input definition. Customers can also send us the definition and ask how it needs to be set before shipping.\u003c\/p\u003e","brand":"Audio Essence","offers":[{"title":"Silver","offer_id":55386632782210,"sku":null,"price":1149.0,"currency_code":"CHF","in_stock":true},{"title":"Black","offer_id":55386632814978,"sku":null,"price":1149.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/DI24HE01.jpg?v=1752065631"},{"product_id":"audio-gd-master-10-mk3","title":"Audio -GD Master 10 MK3 Premium - Dual Mono whole amplifier \u0026 headphone amplifier","description":"\u003cp\u003e\u003cstrong\u003eDelivery time approx. 2-3 weeks. \u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eThe product is handmade according to customer requirements.\u003c\/strong\u003e\u003c\/p\u003e  \u003ch2\u003e  \u003cbr\u003ePremium Package\u003c\/h2\u003e  \u003cp\u003e\u003cbr\u003e\u003cstrong\u003eHeadphone adapter cable\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003eHeadphone cable with two 3-pin XLR connectors and one 4-pin XLR connector for connecting a balanced 4-pin headphone\u003c\/p\u003e  \u003cp\u003e(Headphones with two XLR 3-pin connectors can be connected directly to the Master 10 MK3.)\u003c\/p\u003e  \u003cp\u003e\u003cbr\u003e\u003c\/p\u003e  \u003cp\u003e\u003cb\u003eDC blocker\u003c\/b\u003e\u003c\/p\u003e  \u003cp\u003eBecause the product uses low impedance transformers, strong power line interference (120V or 230V) typically results in low voltage on the power line, causing the transformers to vibrate and make noise.\u003c\/p\u003e  \u003cp\u003eEven with the same power line disturbance, the high-impedance transformer design can operate without vibrations and noise, for example with R-core, EI-core or high-impedance O-core transformers.\u003c\/p\u003e  \u003cp\u003eHowever, in power amplifiers, the high-impedance transformer design impairs sound dynamics, bass reproduction, and control.\u003c\/p\u003e  \u003cp\u003eSince severe power line interference is rare and, according to customer feedback, only occurs in about 10% of users, our power amplifiers are not equipped with a DC blocker. If customers have noticed vibrations and noise in their previous power amplifier model, they can reorder a DC blocker that suppresses 1.2 V DC in the power line, which is sufficient in most cases.\u003c\/p\u003e  \u003cp\u003e  \u003c\/p\u003e  \u003ch2\u003eHighlights\u003c\/h2\u003e  \u003cul\u003e  \u003cli\u003eTrue symmetrical ACSS integrated amplifier without negative feedback\u003c\/li\u003e  \u003cli\u003eDual-mono design power amplifier and headphone amplifier\u003c\/li\u003e  \u003cli\u003eSupports 250W x 2 (8 Ohm) speaker output\u003c\/li\u003e  \u003cli\u003eSupports 50W x 2 at 40 Ohm (high gain mode) headphone output and 5W x 2 at 40 Ohm (low gain mode)\u003c\/li\u003e  \u003cli\u003eApplied “Linear Fidelity” technology\u003c\/li\u003e  \u003cli\u003eSoft-start power design\u003c\/li\u003e  \u003c\/ul\u003e  \u003ch2\u003e  \u003cbr\u003eNew ACSS design\u003c\/h2\u003e  \u003cp\u003eThe Master-10 MK3 is a true symmetrical design that utilizes the latest ACSS design, making an XLR connection sound as good as an ACSS connection. It looks complex, but it's actually the simplest design ever.\u003c\/p\u003e  \u003cp\u003eIt contains many components for processing the power supply. The Master-10 MK3 power amplifier has only a single \u0026quot;voltage\u0026quot; amplification stage for signal processing, but operates in ACSS mode, so it's actually a current amplification stage instead of a voltage amplification stage, whereas conventional OPA chips already contain two or three voltage amplification stages. The simplest and shortest signal path ensures a neutral sound with minimal coloration.\u003c\/p\u003e  \u003cp\u003eThe Master-10 MK3 uses an extremely low-distortion, single-stage ACSS amplifier soldered directly to the main circuit board. The amplifier and preamplifier stages operate in Class A.\u003c\/p\u003e  \u003cp\u003eThe output transistor stages operate in a high quiescent current state. The diamond-shaped output stage design can avoid \u0026quot;switching distortion\u0026quot; as well as a Class A amplifier.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eACSS is a feedback-free technology with fully discrete amplifiers\u003c\/strong\u003eMost people know that global feedback designs perform better in test measurements, while feedback-free designs don't perform as well in test measurements but offer better sound to the human ear. This is where the classical circuits conflict. However, ACSS opens up a new field, offering a sound with minimal coloration that is more neutral, has very low distortion, and offers high linearity.This preserves dynamics, detail and a neutral sound without the sound appearing bright or harsh.\u003c\/p\u003e  \u003cp\u003eAll signal amplification is achieved via current, achieved by the unique, outstanding open-loop multi-output current mirror. The result is incomparably precise and extremely low-distortion signal amplification. The signal path is fully symmetrical, and all transistors operate in Class A mode.\u003c\/p\u003e  \u003cp\u003eThe ACSS components utilize four sets of high-quality Class A parallel power supplies for the dedicated DC power supply. The Class A parallel power supplies feature very high input impedance to prevent pulses from the power supply from affecting the gain stages, as well as low output impedance with very high speed and high linearity, ensuring a very clean power supply.\u003c\/p\u003e  \u003ch2\u003edriver\u003c\/h2\u003e  \u003cp\u003eThe extensive use of high-performance components and a robust power supply guarantee powerful current output capable of driving most existing loudspeakers. The Master-10 MK3 features four channels with diamond-shaped, feedback-free output stages consisting of 24 ON Semiconductor transistors, each rated at 15 A\/230 W. The entire unit's capacitance reaches up to 140,000 uF. Two transformers with a total output of 1500 W are used.\u003c\/p\u003e  \u003ch2\u003eEntrance\u003c\/h2\u003e  \u003cp\u003eThe Master-10 MK3 can process not only balanced XLR signals and unbalanced RCA signals, but also the high-quality ACSS current signal. Regardless of the type of input signal, it can be converted to a balanced current signal and amplified.\u003c\/p\u003e  \u003ch2\u003eShielding and avoiding vibrations\u003c\/h2\u003e  \u003cp\u003eThe Master-10 MK3 uses a heavy-duty aluminum alloy enclosure to prevent eddy currents from the transformers from interfering with the circuit board. The interior is divided into two compartments by aluminum panels to optimally separate the ACSS components, the output stages, and the transformers. The power cable is shielded from rear to front by a copper conduit.\u003c\/p\u003e  \u003cp\u003eThe Master-10 MK3 is designed to minimize vibrations to ensure the best possible sound reproduction. The amplifier components of each channel are housed beneath a 5 mm thick aluminum plate. These aluminum plates not only ensure thermal equilibrium between the hot and cold amplifiers, but our engineers also take care to mount all transistors to the aluminum plate to prevent vibrations that could degrade the sound. Our tests have shown that the aluminum plate provides clear, detailed reproduction and makes the sound less harsh than without the aluminum plate.\u003cbr\u003e\u003c\/p\u003e  \u003ch2\u003eVolume control\u003cbr\u003e  \u003c\/h2\u003e  \u003cp\u003eThe volume control also differs from conventional technology. With conventional volume control technology, the volume is reduced in the analog amplifier input stage via a volume control. The quality of the volume control directly affects the sound quality. A poor-quality volume control results in a loss of detail and channel imbalance, leading to distortion in the sound image. Even a high-quality volume control causes a loss of detail. Regardless of the quality of the volume control, the signal-to-noise ratio deteriorates.\u003c\/p\u003e  \u003cp\u003eHowever, with the Master-10 MK3, we used an I\/V converter volume control, where the volume control is simply a variable passive I\/V conversion at the output of the ACSS amplifier, where the output is a current signal rather than a voltage signal. Volume control is achieved by I\/V conversion, and the volume depends on the conversion of current (I) to voltage (V).(Similar to R-2R D\/A chips with passive I\/V conversion at the output.) This keeps the signal's frequency band flat and eliminates any loss of detail. Sound quality is unaffected at any volume level. After the volume control, four sets of diamond-shaped, feedback-free output stages ensure very low output impedance for driving the speakers.\u003c\/p\u003e  \u003cp\u003eThe quality of the volume control is very important in a true balance device. It must ensure precise signal control of the four channels to achieve the performance of a true balance device. If the signal balance cannot be precisely ensured, severe distortion will occur, making the sound quality and performance even worse than a single-ended device, wasting the balance device design and costs.\u003c\/p\u003e  \u003cp\u003eThe Master-10 MK3 utilizes a four-channel digital relay volume control. The Master-10 MK3 features a total of four channels, which can be switched to volume control by changing the DALE resistors to avoid channel imbalance and achieve the best performance and sound quality from the unit.\u003c\/p\u003e  \u003cp\u003eThe Master-10 MK3 allows users to choose between 99 levels of exponential volume control, with each volume control allowing for continuous adjustment of the volume level. When changing the volume, the various relays are interrupted or closed, which may result in a slight switching of the sound at the output, but this disappears once the volume change is complete.\u003c\/p\u003e  \u003cp\u003e  \u003c\/p\u003e  \u003ch2\u003eSpecifications\u003c\/h2\u003e  \u003cp\u003e\u003cstrong\u003eSignal-to-noise ratio\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003e\u0026gt;115 dB\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003e Speaker output\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003e250 W at 8 ohms\u003cbr\u003e500 W at 4 ohms\u003cbr\u003e1000 W at 2 ohms\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eHeadphone output (high gain mode)\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003e80 W at 25 ohms\u003cbr\u003e50 W at 40 Ohm\u003cbr\u003e10 W at 100 Ohm\u003cbr\u003e3500 mW at 300 ohms\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eHeadphone output (low gain mode)\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003e8 W at 25 Ohm\u003cbr\u003e5 W at 40 Ohm\u003cbr\u003e1 W at 100 Ohm\u003cbr\u003e350 mW at 300 ohms\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eInput sensitivity\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e1.2 V RMS on XLR\u003cbr\u003e2 mA RMS at ACSS\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eInput impedance\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e94 kOhm for XLR\u003cbr\u003e\u0026lt;10 Ohm at ACSS\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eTHD    \u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003e\u0026lt;0.007% (2.83 V RMS)\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eFrequency range\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003e\u0026lt;0.1 dB (20–20 kHz)\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eChannel overlay\u003c\/strong\u003e\u003cbr\u003e     \u0026gt;-120 dB\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eChannel asymmetry\u003c\/strong\u003e\u003cbr\u003e     \u0026lt; 0.05 dB\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePower supply\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003e1 version 100–120 V AC 50\/60 Hz\u003cbr\u003e2 versions 220–240 V AC 50\/60 Hz\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003ePower consumption\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003e150 W static at 240 V or 120 V\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eTransformer power\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003e1600 W (4 transformers)\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003eApprox. 37 kg\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eDimensions\u003cbr\u003e\u003c\/strong\u003e\u003cbr\u003e430 (W) * 400 (L) * 172 (H) (mm, including feet)\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eAccesories\u003c\/strong\u003e\u003c\/p\u003e  \u003cp\u003ePower cable  \u003cbr\u003eMetal remote control X1 (customer must provide two AAA batteries)\u003c\/p\u003e  \u003cp\u003e  \u003c\/p\u003e","brand":"Audio Essence","offers":[{"title":"Silver","offer_id":55587008807298,"sku":null,"price":3199.0,"currency_code":"CHF","in_stock":true},{"title":"Black","offer_id":55587008840066,"sku":null,"price":3199.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/Audio-GD-Master-10-MK3-03.jpg?v=1755850767"},{"product_id":"audio-gd-he-27-all-in-one-kopfhorerverstarker-vorverstarker","title":"Audio-GD HE-27 - All-In-One Headphone Amplifier\/Pre-Amplifier","description":"\u003cp\u003e\u003cstrong\u003eDelivery time approx. 2 weeks\u003cbr\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe HE-27 is a \u003cspan style=\"font-size: 0.875rem;\"\u003etruly symmetrical, fully discrete \u003c\/span\u003eall-in-one headphone amplifier and preamplifier with integrated R-2R DAC.\u003c\/p\u003e\n\u003ch2\u003eHighlights\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRegenerative power supply\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eUses 4 pieces of the most realistic R-2R DA chip PCM1704UK\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eTruly symmetrical, fully discrete headphone amplifier\/preamplifier, ultimate all-in-one device\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e32 Bit \/ PCM384K asynchronous transmission Amanero 384 uses the FPGA sync clock\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eAll digital inputs and digital parts are fully isolated from the analog parts.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eSupports external 10 MHz clock input.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003ePlease note: The PCM1704UK does not support DSD playback. The user must convert DSD to PCM in the source device.\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eDesign overview\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eA truly symmetrical current transfer design uses fully discrete components.\u003c\/li\u003e\n\u003cli\u003eFour pieces of the R-2R DA chip PCM1704UK are used, delivering the most realistic sound.\u003c\/li\u003e\n\u003cli\u003eTwo premium Accusilicon TCXOs with frequencies of 90 and 98 MHz synchronize the entire device and are used for playback of all data rates without PLL up-conversion.\u003c\/li\u003e\n\u003cli\u003eAll digital inputs and digital components are fully isolated from the analog components.\u003c\/li\u003e\n\u003cli\u003eA firmware update can convert the coaxial IN2 input into an external 10 MHz clock input (75 Ohms).\u003c\/li\u003e\n\u003cli\u003eAll settings for the digital mode can be changed live via the control panel on the front.\u003c\/li\u003e\n\u003cli\u003eAt the back of the device, there is a port for firmware upgrades (the cover does not need to be opened to update the firmware).\u003c\/li\u003e\n\u003cli\u003eThe unique, genuine, feedback-free ACSS headphone amplifier features four channels with feedback-free output stages, each consisting of 8 transistors, each with a power of 15 A\/150 W.\u003c\/li\u003e\n\u003cli\u003eThe total device capacitance reaches up to 50,000 uF.\u003c\/li\u003e\n\u003cli\u003eFour R-core transformers with a total power of 160 W are used.\u003c\/li\u003e\n\u003cli\u003eHigh output power of 10 W at 25 ohms and 1000 mW at 300 ohms, which can easily drive most headphones.\u003c\/li\u003e\n\u003cli\u003eUnique, fully analog regenerative power supply technology, similar to a built-in private power generator, providing an extremely clean power supply and making the sound quality more transparent, but analog, much better than the external digital power supply processor, let alone the passive LC power filter output.\u003cbr\u003e　\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eUnique technology in the HE-27\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e1, Unique jitter elimination technology:\u003c\/strong\u003e\u003cbr\u003eJitter has always been considered the main reason why the sound quality of digital systems is inferior to that of high-quality analog systems.\u003cbr\u003eIn some traditional DAC designs, the clock processing method consists of following and restoring the clock of the signal source. Some designs also have the ability to reduce jitter, but with limitations when the jitter level is high.\u003c\/p\u003e\n\u003cp\u003eThis common solution allows good measurement results in laboratory tests. However, in practice, most signal sources have a high jitter level, so the resulting sound quality is not satisfactory. To completely eliminate the influence of jitter in the input signal, the HE-27 uses an asynchronous clocking process.\u003c\/p\u003e\n\u003cp\u003eFirst, it reads a considerable amount of signal source data and stores it in RAM, discards the clock of the signal source, and directly uses the integrated powerful Accusilicons to clock the output from the RAM. Since both data and clock are processed by the FPGA, the influence of transmission on jitter is negligible. The jitter level essentially corresponds to that specified for the TCXO clocks used by the HE-27.\u003cbr\u003e               \u003cbr\u003eThe key to this processing method lies in ensuring the integrity of data transmission, which is our technical secret. One must realize that even the loss of a single data sample out of a million during transmission results in a sharp and clear crackling sound during playback, similar to interference noise or a scratch on a vinyl record.\u003c\/p\u003e\n\u003cp\u003eMr. He is a passionate music lover, and for him, listening sessions are a source of inspiration for new design ideas. Our company not only has the advantage of having full control over the software and hardware technology, but we also have a correct understanding of music playback. Since we do not rely on outsourcing for research and development, we can listen to the devices at any time during development and thus aim for and realize the most realistic sound reproduction.\u003c\/p\u003e\n\u003cp\u003eSince the local clock and the signal source clock are completely isolated from each other and run independently, traditional jitter measurement methods cannot be applied. Instead, a special data acquisition circuit is required to evaluate the level. For humans, the best test method is always the listening test. A jitter-free sound is very realistic and natural, clear like pure water, and very engaging.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2, Unique true ACSS headphone amplifier\/pre-amplifier technology without feedback:\u003cbr\u003e\u003c\/strong\u003e\u003cbr\u003eThe HE-27 features a true symmetrical design using the latest ACSS design. It may seem complex, but it is actually the simplest design ever, with many components for power supply processing.\u003c\/p\u003e\n\u003cp\u003eThe amplifier built into the HE-27 has only a single \"voltage gain stage\" for signal processing but operates in ACSS mode, so it is actually a current gain stage instead of a voltage gain stage, whereas normal OPA chips already contain two or three voltage gain stages. The simplest and shortest signal path ensures the most neutral and least colored sound.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe HE-27 uses a single-stage ACSS amplifier with extremely low distortion, directly soldered onto the mainboard. The gain stages and the Diamond-Cross output stage operate in pure Class-A mode.\u003c\/p\u003e\n\u003cp\u003eACSS is a feedback-free technology realized with fully discrete amplifiers. Most people know that global feedback designs can offer better specifications in test measurements, while feedback-free designs do not perform as well in tests but provide better sound for the human ear. Here lies a conflict between classic circuits. But ACSS opens a new field; it can offer a sound with minimal coloration that is more neutral, with very low distortion and high linearity. Thus, it can maintain dynamics, detail, and neutral sound without sounding bright or harsh.\u003c\/p\u003e\n\u003cp\u003eThe entire signal amplification is done in the current domain and is achieved through the unique, excellent open multi-output current mirror. The result is an incomparably precise and extremely low-distortion amplification of the signal. The signal path is fully symmetrical and all transistors operate in Class-A mode.\u003c\/p\u003e\n\u003cp\u003eThe HE-27 features four channels with feedback-free output stages, consisting of 8 transistors, each with a power of 15 A\/150 W. The total device capacity reaches up to 50,000 uF. Four R-core transformers with a total power of 160 W are used.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e3, Unique, fully analog regenerative power supply technology:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA regenerative power supply is like a private generator integrated into the device. It can largely filter out interference on the power line, supply the audio components with extremely pure power, and return a harmonious and powerful bass as well as a highly analog signal to the audio system and end users, which is far better than an external digital power supply processor, let alone a passive LC power filter output.\u003c\/p\u003e\n\u003cp\u003eIn the implementation of the regenerative power supply, the 120 V\/220 V AC is converted into DC via the regenerative mains input transformer, which is then supplied to the regenerative waveform generator and the driver through a parallel stabilized Class A power supply.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eOne set of symmetrical regenerative waveform generators produces an extremely low-distortion 50 Hz sine wave. After a symmetrical amplifier stage and a powerful driver stage, three regenerative power output transformers output a pure voltage that is stable in both amplitude and frequency.\u003c\/p\u003e\n\u003cp\u003eTwo sets of parallel regulated Class A power supplies independently power the analog output stages of the left and right channels as well as the digital audio components with their different processing functions. Both the regenerative waveform generator and the driver are powered by a stabilized Class A power supply, so their operation is not affected by fluctuations in the power grid and interference.\u003c\/p\u003e\n\u003cp\u003eThe Class A shunt regulator has a very high input impedance to block interference and prevent disturbances from the power grid from entering the audio circuit and affecting sound quality. Additionally, crosstalk between the left and right signals is avoided through the power supply, improving separation.\u003c\/p\u003e\n\u003cp\u003eThe low output impedance exhibits excellent linearity and speed, which also contributes to an outstanding design of the regulated power supply. Arguments from Audio-gd on the design of the regenerative power supply:\u003c\/p\u003e\n\u003cp\u003e1. Through internal design analysis and actual test comparison of the AP SYS-2722, the distortion of the purely analog regenerative sine wave generator is much lower than that of digital synthesis generators.\u003c\/p\u003e\n\u003cp\u003e2. The digital driver stage can have a higher energy conversion efficiency, but the fully analog driver stage has a more analog character.\u003c\/p\u003e\n\u003cp\u003e3. The regenerated waveform frequency of 400 Hz has a higher efficiency in energy conversion. However, the regenerated waveform frequency of 50 Hz is further from the sensitive range of human hearing than 400 Hz, so the sound quality at 50 Hz is softer and more natural.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e4, Unique I\/V conversion volume control technology:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eVolume control also differs from conventional technologies. In conventional volume control technologies, volume is controlled in the analog amplifier input stage via a volume control to reduce the signal. The quality of the volume control directly affects sound quality.\u003c\/p\u003e\n\u003cp\u003eLow-quality volume controls lead to loss of detail and channel imbalance, causing distortion in the sound image. Even with a high-quality volume control, detail loss and degradation of the signal-to-noise ratio occur in the attenuation and amplification modes of the signal.\u003c\/p\u003e\n\u003cp\u003eIn the HE-27, we use an I\/V conversion for volume control. Volume control is done via a variable passive I\/V conversion at the output of the ACSS amplifier, where the output signal is a current signal, not a voltage signal. Volume control is achieved through I\/V conversion, and the volume depends on converting current (I) into voltage (V). (Similar to R-2R D\/A chips that output a passive I\/V conversion.) This keeps the signal frequency band flat and no details are lost. Sound quality is not affected at any volume.\u003c\/p\u003e\n\u003cp\u003eThe quality of volume control is very important in a true balanced device. It must ensure exact signal control of the four channels to achieve the performance of a true balanced device. If the cold and hot signals of the balanced signal cannot be precisely guaranteed, strong distortion occurs at the balanced output, resulting in sound quality and performance even worse than a single-ended device, wasting the balanced device design and cost.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe HE-27 uses a four-channel digitally controlled relay volume control, where volume is adjusted by swapping resistors with a tolerance of 0.05% to avoid channel imbalance and achieve the best performance and sound quality of the device.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe HE-27 features a 100-step volume control with a super-exponential volume curve that can be easily adjusted to the volume of different power amplifiers and speakers. When changing the volume, various relays are opened or closed, which may cause a slight switching noise at the output, but this disappears once the volume change is complete.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eTechnical data\u003c\/h2\u003e\n\u003ctable width=\"1500\" id=\"table1898\" class=\"auto-style1\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eS\/N Ratio\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003e120DB\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003eTHD+N\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003c0.03%\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003eGain\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003eL mode: +13DB\u003cbr\u003e\u003cbr\u003eH mode: +26DB\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003cstrong\u003eVolume characteristic\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003eChannel imbalance\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003c 0.05DB\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eFrequency Range (Whole unit)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e20Hz - 20KHz  (\u003c - 0.25DB)\u003cbr\u003e\u003cbr\u003e20Hz - 150KHz (\u003c - 3DB)\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e Output Level\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003ePreamp Variable output : 18V max (XLR) \/ 9V max (RCA)\u003cbr\u003e\u003cbr\u003eDAC Fixed output : 2-5 V  (XLR) \/1-2.5V ( RCA)\u003cbr\u003e𩇕\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eHeadphone amp Output Power\u003cbr\u003e (Balanced class A )\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial;\"\u003e25 ohm: 10W\u003cbr\u003e40 ohm: 6500W\u003cbr\u003e100 ohm: 2500W\u003cbr\u003e300 ohm: 850mW\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003eHeadphone amp Output Power\u003cbr\u003e (Single-ended  class A )\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e25 ohm: 2800W\u003cbr\u003e\u003cbr\u003e40 ohm: 1800mW\u003cbr\u003e\u003cbr\u003e100 ohm: 750mW\u003cbr\u003e\u003cbr\u003e300 ohm: 250mW\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eDigital Input Sensitivity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e0.4-1 Vp-p(75 Ohms, Coaxial)\u003cbr\u003e\u003cbr\u003e19 dBm (Optical)\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003eXLR input impedance\u003cbr\u003e𩇕\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003eXLR : 94K ohm\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eSupport Operating Systems (USB)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\n\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan lang=\"en-us\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eWindows, OSX, Linux, ISO\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eSupport Sampling\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\u003cspan lang=\"en-us\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e \u003cbr\u003eUSB \u0026 IIS : 44.1kHz - 384kHz \/32Bit DSD64-512\u003cbr\u003e\u003cbr\u003e AES\/EBU and Coaxial mode: 44.1kHz - 192kHz\u003cbr\u003e\u003cbr\u003eOptical mode: 44.1kHz - 96kHz\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003ePower Requirement\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e1 Version 100-120V AC 50\/60 Hz\u003cbr\u003e\u003cbr\u003e2 Version 220-240V AC 50\/60 Hz\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003ePower Consumption\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e42W\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003ePackage Weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\n\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003cspan lang=\"EN-US\"\u003eApproximately\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan lang=\"en-us\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e12\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-family: Arial;\"\u003eKG\u003cbr\u003e　\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003eDimensions\u003cbr\u003e　\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\n\u003cspan\u003eW430 X L445 X H80\u003c\/span\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cspan\u003e \u003c\/span\u003e(MM) \u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"center\" width=\"500\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eAccessories\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd align=\"center\" width=\"1000\" colspan=\"2\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003eAC power cord X1\u003cbr\u003eUSB cable X1\u003cbr\u003eMetal remote X1\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Audio Essence","offers":[{"title":"Silver","offer_id":55856490086786,"sku":null,"price":2449.0,"currency_code":"CHF","in_stock":true},{"title":"Black","offer_id":55856490119554,"sku":null,"price":2449.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/AGD-HE-27_02.jpg?v=1761135258"},{"product_id":"audio-gd-r-29","title":"Audio-GD R-29 - Headphone Amplifier \/ Preamplifier and R-2R DAC","description":"\u003cp\u003e\u003cstrong\u003eDelivery time approx. 2 weeks\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eFully discrete transistor headphone amplifier\/preamplifier and R-2R DAC in one model. Integrated multi-OS and NOS modes. Support for PCM384 and DSD512\u003c\/p\u003e\n\u003ch2\u003eThe difference from the R-28 MK3\u003c\/h2\u003e\n\u003cp\u003eThe R-28 MK3 is a \u003cstrong\u003efully symmetrical\u003c\/strong\u003e headphone amplifier\/preamplifier with discrete transistors and an R-2R DAC in one model.\u003c\/p\u003e\n\u003cp\u003eThe R-29 is a fully discrete headphone amplifier\/preamplifier with transistors and an R-2R DAC in one model.\u003c\/p\u003e\n\u003ch2\u003eR-29 Features\u003c\/h2\u003e\n\u003cp\u003e1. Fully symmetrical headphone amplifier\/preamplifier with discrete transistors and DAC in one model, the maximum output power of the headphone amplifier reaches 3800 mW, making it suitable for most headphones.\u003c\/p\u003e\n\u003cp\u003e2. The device has two gain modes: 12 dB low gain for headphones with sensitivity over 95 dB and 22 dB high gain combined with strong power sufficient to drive the HE6 with about 85 dB sensitivity. If the customer wants a gain of 6-12 dB, the total gain is 28-34 dB.\u003c\/p\u003e\n\u003cp\u003e3. Built-in 5 linear power supplies and two pure Class-A power supplies\u003c\/p\u003e\n\u003cp\u003e4. Built-in 2 groups of fully discrete true DSD-native decoders and 4 groups of fully discrete R-2R PCM decoders and 32 Bit \/ PCM384K \/ DSD512 asynchronous transfer Amanero 384.\u003c\/p\u003e\n\u003cp\u003e5. USB transmits the IIS signal to the FPGA processor and receives the clock signal from the FPGA processor. The USB interface has no built-in data clocks, the signal transmission is very accurate, and the sound quality is significantly improved.\u003c\/p\u003e\n\u003cp\u003e6. The FPGA processes data in parallel mode. The IIS data is transmitted in serial transmission mode, each data transmission requires one clock cycle, a data frame (including L and R data) requires 64 clock cycles for processing or transmission, so the data is affected by the 64 clock cycles.\u003c\/p\u003e\n\u003cp\u003eHowever, the parallel data processing and transmission mode requires only one clock cycle to complete the processing and transmission of a data frame, thus avoiding the influence of clock stability.\u003c\/p\u003e\n\u003cp\u003eThe IIS input (including USB and HDMI IIS) is combined into double 32-bit parallel data after input, the SPDIF input is combined into double 24-bit parallel data after the decoder, and the DSD input is combined into double 64-bit parallel data after input.\u003c\/p\u003e\n\u003cp\u003eThe parallel processing and transmission mode can improve sound quality in terms of transparency and detail, but remains analog.\u003c\/p\u003e\n\u003ch2\u003eAdvantages and disadvantages of R-2R DACs\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAdvantages\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e1. R-2R does not convert the clock signal into the output signal.\u003c\/p\u003e\n\u003cp\u003e2. R-2R is insensitive to jitter. Delta-Sigma D\/A converters are much more sensitive to jitter.\u003c\/p\u003e\n\u003cp\u003e3. The output signal is significantly more precise compared to Delta-Sigma D\/A converters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDisadvantages\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e1. THD is very good today with Sigma-Delta chips compared to R2R ladders, but not as good.\u003c\/p\u003e\n\u003cp\u003e2. Disturbances and inaccuracies of ladder resistors are very difficult to avoid and require complex technologies to fix them.\u003c\/p\u003e\n\u003ch2\u003eBasic design of R-2R on the market\u003c\/h2\u003e\n\u003cp\u003eThe R-2R DAC is very popular nowadays and is available from DIY kits to fully high-end products. \u003c\/p\u003e\n\u003cp\u003eIn the lower segment of the DIY market, the R-2R design is often based on an old technology developed long ago by MSB and only includes the basic R2R ladder design, without the wonderful correction design of the original MSB technology.\u003c\/p\u003e\n\u003cp\u003eThis design uses data shift register logic chips in serial mode to convert data into an analog signal. The structural problems of R2R technology cannot be avoided, and performance depends solely on the accuracy of the ladder resistors. \u003c\/p\u003e\n\u003cp\u003eIn the high-end market, the R2R design is much more complex and achieves better performance. A simple R2R ladder is simply not enough to achieve good performance and high sound quality! Some manufacturers use a shift register design. A less complex and less efficient design based on traditional logic chips operating in serial mode to correct the ladder.\u003c\/p\u003e\n\u003cp\u003eA far better design switches resistors in parallel mode. An ultra-fast FPGA controls and corrects the R2R ladder. The parallel mode controls each bit individually, achieving unprecedented performance. (In parallel mode, only one clock cycle is needed to output all data; in serial mode, at least 8 to 24 clock cycles are required.)\u003c\/p\u003e\n\u003cp\u003eThe parallel design is much more complicated. Once properly designed, it can correct every bit of the ladder. The photo below shows a design with such an FPGA that can correct the inevitable imperfections of the R2R ladder caused by the intolerance of resistor disturbances and achieve the best performance.\u003c\/p\u003e\n\u003ch2\u003eAccuracy of ladder resistors (tolerance)\u003c\/h2\u003e\n\u003cp\u003eMany people believe that the tolerance of the resistors in the ladder is the most important for achieving the best performance. Nowadays, a resolution of 24 bits is standard. What tolerance is required to achieve a resolution of 24 bits?\u003c\/p\u003e\n\u003cp\u003eLooking at 16 bits, a tolerance of 1\/66536, 0.1% (1\/1000) is far from sufficient, even a tolerance of 0.01% (1\/10000), currently the best available tolerance worldwide, cannot correctly process 16 bits; here we are not even calculating 24 bits!\u003c\/p\u003e\n\u003cp\u003eThe tolerance of the resistor will never solve the imperfections of a ladder. This would require resistors with a tolerance of 0.00001% and the ability to process a resolution of 24 bits. However, this is only theoretically possible, as the discreteness of the switching logic chips already has too high an internal impedance and negates the impossible tolerance of a resistor.\u003c\/p\u003e\n\u003cp\u003eThe solution is to correct the traces and not rely on resistor tolerance. It is a combination of both: resistors with extremely low tolerance controlled by a correction technology, and very fast FPGAs used in our design.\u003c\/p\u003e\n\u003ch2\u003eMeaning of FPGA\/CPLD\u003c\/h2\u003e\n\u003cp\u003eFPGA stands for \"Field Programmable Gate Array.\" \u003cbr\u003eNowadays, FPGA is used in many high-quality DACs, such as the popular ROCKNA WAVEDREAM DAC. We have been using FPGA in our DAC products since 2008.\u003c\/p\u003e\n\u003cp\u003eThe R-29 features an integrated FPGA and three CPLD programmable chipsets to separate the various configured circuits and avoid interruptions.\u003c\/p\u003e\n\u003cp\u003eThe internal hardware design is fully controlled by complex software. A major advantage is that the software in the FPGA can be easily updated to offer new features or improve performance. Such a design is very flexible and future-proof!\u003c\/p\u003e\n\u003ch2\u003eFPGA\/CPLD tasks\u003c\/h2\u003e\n\u003cp\u003e1. The powerful FPGA SPDIF interface replaces conventional SPDIF interface chips like DIR9001, WM8805, or AK411X, which have lower performance compared to the FPGA.\u003c\/p\u003e\n\u003cp\u003e2. Complete re-clocking process with FIFO design, applicable to all inputs. This way, the output data remains fully synchronized with the clock signal to avoid any jitter.\u003c\/p\u003e\n\u003cp\u003e3. Integrated 2X, 4X, and 8X oversampling and digital filters as well as 4 different true NOS modes (analog 6-dB filtering only). This allows you to configure the device exactly to your preferences!\u003c\/p\u003e\n\u003cp\u003e4. Integrated special design to simulate the sound of vinyl records.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003eBuilt-in excellent, true discrete amplifier\u003c\/h2\u003e\n\u003cp\u003eThe final signal stage is the analog output stages, which have a decisive influence on the ultimate sound quality of the DAC. \u003c\/p\u003e\n\u003cp\u003eAfter the D\/A conversion by the R2R D\/A modules, the analog signal is carried through fully discrete, matched transistor output stages\u003c\/p\u003e\n\u003cp\u003eThe special high-speed ACSS output stages are feedback-free and current-driven. \u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThey are so special because almost all other designs have to convert the signal multiple times from current to voltage and back, which leads to less detail and a less defined soundstage.\u003c\/p\u003e\n\u003cp\u003eThe output stages feature two pairs of 15-W transistors that provide strong driver power. The diamond differential design prevents switching distortion, operates in Class A, but does not draw high current at idle. The balance drive mode suppresses noise and distortion and improves the soundstage, background, and transparency, etc.\u003c\/p\u003e\n\u003ch2\u003eHigh-performance power supply design\u003c\/h2\u003e\n\u003cp\u003eIn total, 5 groups of ultra-fast and extremely low-noise power supplies ensure a very clean power supply for the digital parts of the DAC. For the analog amplifiers, two groups of pure Class-A power supplies are installed, which make the sound more transparent and analog.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eTechnical details\u003c\/h2\u003e\n\u003ctable class=\"auto-style3\" id=\"table1909\" width=\"1500\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eS\/N Ratio\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e\u003e115DB\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eTHD+N\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e\u003c0.015%\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eGain\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eL mode : +12DB\u003cbr\u003eH mode : +22DB\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eChannel imbalance\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e\u003c 0.05DB\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eFrequency Breadth\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e20Hz - 20KHz  (\u003c - 0.5DB)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e Output Level\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eHeadphone output : 10V RMS\u003cbr\u003ePreamp Variable output : 10V RMS\u003cbr\u003eDAC Fixed output : 2.5 V RMS\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eHeadphone amp output power level\u003cbr\u003e(Only for  headphone over 15 ohms.)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e3800mW\/25 ohm\u003cbr\u003e2400mW\/40 ohm\u003cbr\u003e950mW\/100 ohm\u003cbr\u003e330mW\/300 ohm\u003cbr\u003e165mW\/600 ohm\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eOutput impedance\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e1 ohm \/ Headphone output\u003cbr\u003e5 ohm \/ DAC \/ Preamp output\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eInput Sensitivity\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e0.5 Vp-p(75 Ohms, Coaxial)\u003cbr\u003e19 dBm (Optical)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eSupport Operating Systems (USB)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan lang=\"en-us\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eWindows, OSX, Linux, ISO\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eSupport Sampling\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan lang=\"en-us\"\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e USB \u0026 IIS : 44.1kHz - 384kHz \/32Bit DSD64-512\u003cbr\u003e Coaxial mode: 44.1kHz - 192kHz\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003ePower Requirement\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e1 Version 100-120V AC 50\/60 Hz\u003cbr\u003e2 Version 220-240V AC 50\/60 Hz\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eIdle Power Consumption\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e10W\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003ePackage Weight\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cspan lang=\"EN-US\"\u003eApproximately\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003e3.3KG\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eDimensions\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eW240 X L230 X H85 (MM, with feet, Fully aluminium ) \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"500\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eAccessories\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd width=\"1000\" align=\"center\"\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial; font-size: small;\"\u003eAC power cord X1\u003cbr\u003eUSB cable X1\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Audio Essence","offers":[{"title":"Silver","offer_id":55856589013378,"sku":null,"price":599.0,"currency_code":"CHF","in_stock":true},{"title":"Black","offer_id":55856589046146,"sku":null,"price":599.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0561\/0304\/3261\/files\/AGD-R29-01.jpg?v=1761136974"}],"url":"https:\/\/audioessence.ch\/en\/collections\/audio-gd-en.oembed?page=2","provider":"Audio Essence","version":"1.0","type":"link"}