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Prometheus

The FangSound Prometheus combines the genuine flagship ESS 9039PRO DAC with high-resolution 32-bit/768-kHz playback and delivers an impressive 1W Output power at 16/32 Ω without any external power supply.

Embedded in an ultra-lightweight (33 g), precisely CNC-machined full-aluminum enclosure, the carefully designed thermal management ensures distortion-free, dynamic sound with a pitch-black background even during sustained high-performance operation.

Key Features

1. Flagship DAC Core: Genuine 9039PRO Flagship Decoder

• Equipped with ESS’s flagship DAC, known for its extremely high dynamic range and minimal distortion, it provides a solid foundation for precise imaging, rich layering, and spatial airiness.

• The flagship chip is not merely about accumulating technical specifications; it ensures uncolored signal output at studio-master quality to support high driving power downstream.

• When playing high-resolution audio files, the finest overtones and spatial reverberation are reproduced faithfully, achieving a balanced combination of analytical detail and musicality.

2. Powerful Output: 1 W + 1 W at 32 Ω / 16 Ω (No External Power Supply Required)

• The core driver architecture follows the principle of high current delivery and low output impedance, ensuring stable power output across a wide variety of headphone loads.

• Achieves an output power of $1\,\text{W} + 1\,\text{W}$ without any external power supply—meaning fewer cables, less bulk, and still the authority needed to drive a wide range of headphones.

• Even with complex music featuring wide dynamic swings, transient control remains clean and bass reproduction stays tight, avoiding the typical “lots of power, little finesse” problem.

3. High-Resolution Support: 32-bit / 768 kHz

• Supports audio formats up to 32-bit / 768 kHz, providing ample headroom for high-bitrate sources and future-proofing for the evolving audio ecosystem.

• Higher quantization accuracy and sampling rates provide more room to capture the finest details and nuances of the environment, reducing the risk of a “flat” listening experience.

• Perfectly complements the flagship DAC’s dynamics and linearity, achieving a perfect balance between resolution and musicality.

4. System-Level Noise Suppression and Stability Engineering

• From the power supply path to signal routing, the circuit layout prioritizes separating the digital and analog sections to suppress crosstalk and ensure an extremely low noise floor.

• Trace lengths and shielding strategies are carefully controlled to preserve a pitch-black background and stable imaging even at high output currents.

• Designed for sustained high-power operation, the device delivers consistent linearity and performance even during extended use—no thermal power degradation, no signal collapse.

Compact enclosure, thermally optimized

1. Full-aluminum CNC unibody construction

• The enclosure is precision-milled from a single block of aluminum alloy, ensuring exceptional structural rigidity and excellent thermal conductivity.

• The seamless unibody design minimizes assembly gaps and improves both electromagnetic shielding and long-term durability.

• The anodized surface treatment provides a refined tactile feel while also offering scratch resistance and wear protection—an ideal balance of comfort and durability.

2. Compact form factor, powerful core

• The device retains the compact dimensions typical of mainstream dongle DACs and ensures excellent portability without becoming a burden on the go.

• Careful coordination of component density and thermal management accommodates high-specification power supply and amplifier modules—without any additional bulk.

• The internal structure follows the principles of central symmetry and mechanical balance, ensuring durable and stable connections even with frequent movement and use.

3. Thermal management: Designed for continuous high-power output

• The high thermal conductivity of the aluminum enclosure, combined with internal thermal pathways, ensures that heat from core components is rapidly dissipated and evenly distributed across the enclosure.

• The enclosure’s edge geometry and wall thicknesses have been optimized to achieve the ideal balance of strength, cooling efficiency, and a comfortable surface temperature during handling.

• Even at high power and during extended operation, the device maintains controlled surface temperatures—protecting consistent sound performance and longevity.

4. Professionalism down to the last detail

• A reinforced connection area with mechanical protection against loosening reduces stress caused by repeated plugging and unplugging.

• The highest-quality components and stringent soldering processes minimize the risk of interference noise.

• All labels and chamfers follow a restrained, refined aesthetic—with visual and tactile harmony given equal priority.

Measurement diagrams & labels

• RMS level ($V_\text{rms}$): Ch1: 6.068 $V_\text{rms}$ | Ch2: 6.087 $V_\text{rms}$

• THD+N ratio / SINAD:

  • Frequency: 1.00000 kHz

  • RMS level: Ch1: 4.048 $V_\text{rms}$ | Ch2: 4.063 $V_\text{rms}$

  • THD+N ratio: Ch1: 0.000361% | Ch2: 0.000431%

  • SINAD: Ch1: 108.844 dB | Ch2: 107.313 dB

• Dynamic range – AES17: Ch1: 128.399 dB | Ch2: 127.576 dB

• Signal-to-noise ratio (SNR): Ch1: 129.808 dB | Ch2: 128.143 dB

Safety Instructions

DANGER

• Do not disassemble or modify this device yourself. Unauthorized disassembly may result in electric shocks, fire, device damage, or accidents. The warranty claim is void in these cases.

• Keep the device away from water, moisture, and other liquids. Contact with liquids may cause short circuits, electric shocks, or a fire hazard.

• Do not continue using the device if it is damaged or malfunctioning.

CAUTION

• Read this manual carefully before use and keep it for future reference.

• Headphone Use Recommendation: Do not connect two or more headphones simultaneously. Impedance differences may increase the risk of damage to the headphones or the device.

• To prevent hearing damage, start at a low volume and increase it gradually. Prolonged listening at high volume can cause permanent hearing loss.

• Ventilation and Placement: Do not cover the device during operation. Do not place it in enclosed or confined spaces. Always ensure adequate ventilation.

• Do not place the product near heat sources, open flames, or direct sunlight.

• This product is intended exclusively for use in dry indoor environments.

• Repair and Support: If the device malfunctions, stop using it immediately and contact an authorized dealer or the manufacturer for service.

• Please strictly follow the safety instructions above to ensure your safety and the proper operation of the device.

• KEEP THIS MANUAL IN A SAFE PLACE.

Technical Specifications & Contact