Portable Hi-Res USB DAC & Headphone Amplifier for Audiophile Listening

The Fosi Audio DS1 Dongle DAC Headphone Amplifier is a compact high-resolution USB DAC and headphone amplifier designed for audiophiles, gamers, music lovers, and mobile HiFi enthusiasts seeking premium sound quality on the go. Powered by the flagship ESS ES9038Q2M DAC chipset, the DS1 delivers exceptional clarity, ultra-low distortion, and powerful headphone amplification in an ultra-portable form factor.

Supporting up to 32bit/768kHz PCM and DSD512 playback, the DS1 transforms smartphones, laptops, tablets, and portable audio players into high-fidelity audio systems with clean, dynamic, and detailed sound reproduction.

ESS ES9038Q2M DAC for Reference-Grade Audio

At the heart of the DS1 is the renowned ESS Technology ES9038Q2M DAC chip, widely respected for its outstanding detail retrieval, dynamic range, and low distortion performance.

Hi-Res Audio Support:

• PCM up to 32bit / 768kHz
• Native DSD64 / 128 / 256 / 512
• Ultra-low THD+N
• High signal-to-noise ratio
• Accurate high-resolution playback

This premium DAC architecture delivers:

• Crisp vocals
• Deep controlled bass
• Extended treble detail
• Wide soundstage
• Exceptional instrument separation

Perfect for:

• Lossless music streaming
• Hi-Res audio playback
• Portable audiophile setups
• Studio-quality listening
• Mobile gaming audio

Powerful Headphone Amplification

Despite its compact dongle size, the DS1 provides impressive output power capable of driving demanding headphones and IEMs with ease.

Output Power:

• 120mW Single-Ended (3.5mm)
• 220mW Balanced (4.4mm)

Supported Headphone Impedance:

• 16Ω–300Ω

The high-power amplification stage ensures:

• Better headphone control
• Improved dynamics
• Cleaner transient response
• Enhanced low-frequency authority
• More detailed listening experience

Ideal for:

• Audiophile headphones
• High-impedance headphones
• Sensitive IEMs
• Portable DAC/AMP setups

Dual Headphone Outputs: 3.5mm + 4.4mm Balanced

The DS1 offers both standard and balanced headphone outputs for maximum compatibility and upgraded listening performance.

Output Options:

3.5mm Single-Ended Output

• Universal headphone compatibility
• Ideal for daily listening
• Low-noise clean output

4.4mm Balanced Output

• Increased output power
• Better channel separation
• Lower crosstalk
• Improved detail and dynamics

Balanced audio enthusiasts will appreciate the enhanced imaging and cleaner presentation offered by the 4.4mm output.

Ultra-Low Noise & High-Fidelity Sound

The DS1 is engineered with a low-noise HiFi audio architecture optimized for pure and transparent sound reproduction.

Audio Performance Highlights:

• THD+N < 0.0006%
• SNR ≥ 120dB
• Noise < 1.6uV
• Wide frequency response
• Near-silent background noise

This results in:

• Cleaner playback
• Greater micro-detail retrieval
• Reduced distortion
• Improved dynamic range
• Accurate musical presentation

Perfect for critical listening and high-resolution audio playback.

Universal USB-C Compatibility

The DS1 supports a wide range of modern devices and operating systems without requiring complex setup.

Compatible Devices:

• Android smartphones
• iPhones & iPads
• Windows PCs
• Mac computers
• Tablets
• Laptops
• Portable music players

Ideal Usage Scenarios:

• Daily commuting
• Office listening
• Mobile gaming
• Home HiFi
• Portable studio monitoring

The included USB-A adapter ensures broad compatibility with desktops and legacy USB ports.

Compact Portable Metal Design

Crafted from durable tin alloy material, the DS1 combines portability with premium build quality.

Design Features:

• Lightweight 38g construction
• Compact dongle size
• Durable metal housing
• Excellent heat management
• Travel-friendly design

Its minimalist portable form factor makes it easy to carry in pockets, laptop bags, or everyday carry setups.

Technical Specifications

• Model: DS1
• DAC Chipset: ESS ES9038Q2M
• Output Power:
  • 120mW (3.5mm Single-Ended)
  • 220mW (4.4mm Balanced)
• Headphone Impedance: 16–300Ω
• Input Mode: USB Type-C
• Output Modes:
  • 3.5mm Headphone Output
  • 4.4mm Balanced Output
• Frequency Response: 20Hz–20kHz (±0.5dB)
• THD:
  • 0.0006% (32Ω SE)
  • 0.001% (32Ω BAL)
• SNR: ≥120dB
• PCM Support: Up to 32bit/768kHz
• DSD Support: DSD64 / 128 / 256 / 512
• Material: Tin Alloy
• Weight: 38g

What’s Included

• DS1 USB DAC Headphone Amplifier ×1
• USB Type-C to Type-C Cable ×1
• USB-A to USB-C Adapter ×1
• User Manual ×1
• 24-Month Warranty Support

Key Features at a Glance

• ESS ES9038Q2M flagship DAC
• 32bit/768kHz PCM support
• Native DSD512 playback
• 3.5mm & 4.4mm balanced outputs
• Portable USB DAC amplifier
• Ultra-low distortion audio
• High-power headphone amplification
• Universal Android/iOS/Windows/Mac compatibility
• Compact lightweight metal body
• Audiophile-grade HiFi sound