Fosi Audio DS3 Portable Hi-Res DAC & Headphone Amplifier

The Fosi Audio DS3 Portable Hi-Res DAC & Amp is a no-compromise USB-C dongle DAC built for audiophiles and serious gamers who demand flagship decoding, hardware-level spatial audio, and absolute portability. Featuring the ESS Sabre ES9039Q2M DAC, XMOS POWERED processor, and true balanced output, the DS3 delivers reference-grade sound from smartphones, PCs, laptops, PS5, and Nintendo Switch—without batteries, drivers, or complexity.

Designed to be both music-accurate and game-dominant, the DS3 combines ultra-low distortion, massive dynamic range, and intelligent hardware DSP to elevate every listening session—whether you’re chasing micro-details in high-resolution tracks or pinpointing footsteps in competitive FPS titles.

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Flagship ESS Sabre ES9039Q2M – Reference-Grade Decoding

At the heart of the DS3 lies the ESS Sabre ES9039Q2M, a top-tier DAC capable of PCM 32-bit/768kHz and native DSD512 decoding. With an ultra-clean signal path delivering ≥122 dB SNR and <0.0003% THD+N, the DS3 reproduces music with exceptional transparency, precise imaging, and lifelike dynamics—faithful to the original recording.

From subtle orchestral textures to punchy electronic basslines, every detail is rendered with authority and control.

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World’s First Battery-Free XMOS POWERED DAC/Amp

The DS3 is the world’s first portable DAC/amp to integrate XMOS POWERED in a battery-free design. Its dual-core 1.6 GHz processing engine ensures rock-solid clocking, ultra-low latency, and lossless data transfer from source to DAC—maximizing the full potential of the ES9039Q2M.

The result: stable, jitter-free playback across phones, PCs, consoles, and handheld devices with minimal power draw.

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Hardware-Level 7.1 Spatial Audio – No Software Required

Fosi Audio’s proprietary hardware spatial audio algorithm transforms standard stereo signals into virtual 7.1 surround sound, creating a realistic 360° soundstage—entirely at the hardware level.

No drivers. No apps. No system interference.
Just immersive positional audio for both gaming and cinematic content.

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Dedicated FPS Mode for Competitive Gaming

The FPS sound mode is precisely tuned to enhance footsteps, reloads, and gunfire, giving you a decisive positional advantage in shooters. Supporting UAC 1.0, the DS3 connects directly to PS5 and Nintendo Switch for true plug-and-play gaming—no configuration needed.

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HiFi & Gaming Dual Modes with Advanced Customisation

The DS3 supports both UAC 2.0 (Hi-Res Music) and UAC 1.0 (Console Gaming), with volume memory retained in both modes. Fine-tune your sound using:

• 8 PCM digital filter options

• 8-band hardware-level PEQ (adjustable via web-based control panel)

• Gain control for sensitive IEMs or demanding headphones

All tuning is handled at the hardware level—ensuring zero digital degradation.

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Ultra-Light Premium Design

CNC-milled from aerospace-grade aluminum, the DS3 weighs just 16 grams. A unique tempered-glass skylight reveals the internal circuitry, blending industrial elegance with functional minimalism—perfect for portable audiophile setups.

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Specifications

DAC Chip: ESS Sabre ES9039Q2M
USB Audio Processor: XMOS POWERED

Input: USB-C

Outputs:

• 3.5mm Single-Ended

• 4.4mm Balanced

USB Audio Class: UAC 2.0, UAC 1.0

Maximum Sampling Rate:

• UAC 2.0: PCM 32-bit/768kHz, Native DSD512, DoP DSD256

• UAC 1.0: PCM 16-bit/48kHz

Maximum Output Power:

• 3.5mm: ≥120mW ×2 @ 32Ω (THD+N <1%)

• 4.4mm: ≥220mW ×2 @ 32Ω (THD+N <1%)

Frequency Response: 20Hz – 48kHz (±0.2dB)

Signal-to-Noise Ratio (SNR):

• 3.5mm: ≥122dB

• 4.4mm: ≥120dB

Dynamic Range:

• 3.5mm: ≥119dB

• 4.4mm: ≥116dB

THD+N:

• 3.5mm: <0.0003%

• 4.4mm: <0.0005%

Supported Headphone Impedance: 16–300Ω

Weight (Without Cable): 16g

Dimensions: 55 × 20 × 11 mm