Portable Hi-Resolution USB DAC & Headphone Amplifier for Audiophiles

The Fosi Audio DS2 Dongle DAC Headphone Amplifier is a next-generation portable USB-C DAC and headphone amplifier engineered for audiophiles seeking premium HiFi sound from smartphones, tablets, laptops, and portable audio devices. Featuring dual flagship Cirrus Logic CS43131 DAC chips, the DS2 delivers ultra-clean audio reproduction with exceptional detail, powerful amplification, and remarkably low distortion in a sleek CNC-machined metal body.

Supporting PCM 32bit/384kHz and DSD256 decoding, the DS2 transforms everyday devices into high-resolution audio systems capable of driving both sensitive IEMs and demanding over-ear headphones with ease.

Dual CS43131 DAC Chips for Flagship Audio Performance

At the core of the DS2 are two high-performance Cirrus Logic CS43131 DAC chips designed for ultra-low noise, high dynamic range, and accurate HiFi sound reproduction.

Premium Audio Performance:

• Dual CS43131 DAC architecture
• PCM 32bit / 384kHz support
• Native DSD256 decoding
• Ultra-low 1μV noise floor
• THD below 0.0002%
• 130dB signal-to-noise ratio
• 109dB SINAD performance

This advanced audio platform produces:

• Clean and transparent sound
• Deep controlled bass
• Natural vocal clarity
• Precise instrument separation
• Wide soundstage imaging

Perfect for:

• Hi-Res music streaming
• Lossless audio playback
• Audiophile portable setups
• Critical listening
• Gaming and entertainment audio

Powerful Portable Headphone Amplifier

The DS2 combines premium DAC decoding with powerful headphone amplification capable of driving a wide range of headphones and IEMs.

Output Power:

• 128mW Single-Ended (3.5mm)
• 170mW Balanced (4.4mm)

Supported Headphone Impedance:

• 16Ω–300Ω

The amplifier section delivers:

• Strong dynamic performance
• Better headphone control
• Clean transient response
• Improved detail retrieval
• Excellent compatibility with portable and desktop headphones

Ideal for:

• Audiophile headphones
• High-sensitivity IEMs
• Portable monitoring
• Balanced headphone setups

Dual Audio Outputs: 3.5mm & 4.4mm Balanced

The DS2 features both standard and balanced headphone outputs for flexible compatibility and upgraded listening performance.

Output Options:

3.5mm Single-Ended Output

• Compatible with most headphones and earphones
• Clean low-noise audio performance
• Excellent for daily portable listening

4.4mm Balanced Output

• Higher output power
• Improved channel separation
• Lower interference and crosstalk
• Enhanced dynamics and imaging

Balanced audio users will appreciate the improved clarity and immersive sound presentation.

Independent 60-Step Volume Control

Unlike standard dongle DACs that rely entirely on device volume, the DS2 includes independent hardware volume buttons with precise 60-step control.

Volume Features:

• Smooth stepless volume adjustment
• Independent hardware volume control
• Volume memory function
• Accurate low-volume listening
• Better compatibility with sensitive IEMs

This provides a more refined and user-friendly listening experience across all connected devices.

Plug-and-Play Universal Compatibility

The DS2 is designed for effortless operation with modern USB-C devices and operating systems.

Compatible Devices:

• Android smartphones
• iPhone 15 series
• iPad Pro
• Windows PCs
• Mac computers
• Laptops
• Tablets

Ideal Usage Scenarios:

• Mobile HiFi listening
• Daily commuting
• Portable gaming
• Office audio setups
• Laptop music playback

No complicated software installation is required for most devices.

CNC Metal Construction with Premium Finish

Built from solid CNC-machined metal, the DS2 combines durability, portability, and elegant minimalist design.

Build Features:

• Precision CNC-machined body
• Shock-resistant construction
• Compact portable size
• Smooth ergonomic finish
• Premium tactile feel

Its durable design makes it ideal for everyday portable use while maintaining an upscale audiophile appearance.

Technical Specifications

• Model: DS2-2024
• DAC Chipset: Dual Cirrus Logic CS43131
• Output Power:
  • 128mW (3.5mm Single-Ended)
  • 170mW (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: <0.0002%
• SNR: ≥130dB
• SINAD: >109dB
• Noise Floor: <1μV
• PCM Support: Up to 32bit/384kHz
• DSD Support: DSD256
• Compatible Systems:
  • iOS
  • Android
  • Mac
  • Windows
• Weight: 3.2 ounces

Features

• Dual CS43131 flagship DAC chips
• Hi-Res PCM 32bit/384kHz support
• Native DSD256 playback
• 3.5mm and 4.4mm balanced outputs
• Portable USB-C DAC amplifier
• Ultra-low distortion audio
• Independent 60-step volume control
• Plug-and-play compatibility
• CNC-machined metal housing
• Audiophile-grade portable sound