Compact Desktop HiFi DAC & Headphone Amplifier for Music, Gaming & Everyday Audio

The Fosi Audio Q4 Desktop DAC Headphone Amplifier is a compact all-in-one digital-to-analog converter and headphone amplifier designed for desktop HiFi audio, gaming, music streaming, and multimedia entertainment. Featuring USB, optical, and coaxial inputs, the Q4 easily connects to PCs, Macs, gaming consoles, TVs, powered speakers, and headphones for a cleaner and more immersive listening experience.

With built-in bass and treble controls, low-noise audio processing, and support for high-resolution 24bit/192kHz audio playback, the Q4 serves as an excellent desktop DAC, headphone amp, preamp, and volume controller in one compact device.

Perfect for users seeking affordable HiFi sound with simple plug-and-play convenience.

Plug-and-Play USB DAC for PC & Mac

The Q4 is designed for effortless setup without requiring special software, apps, or drivers.

Supported Operating Systems:

• Windows XP / 7 / 8 / 10
• Mac OS
• Linux

Simply connect the DAC and start enjoying high-quality digital audio instantly.

Ideal For:

• Desktop computers
• Laptops
• Gaming setups
• Streaming audio
• Everyday music listening

The plug-and-play functionality makes it ideal for both beginners and experienced audio enthusiasts.

Versatile Digital Audio Connectivity

The Q4 supports multiple digital inputs for compatibility with a wide variety of audio devices.

Inputs:

• USB
• Optical (TOSLINK)
• Coaxial S/PDIF

Outputs:

• 3.5mm Headphone Output
• RCA Line Output

The RCA output allows connection to:

• Stereo amplifiers
• Powered speakers
• Desktop speaker systems
• Active monitors

This flexibility makes the Q4 an excellent central audio hub for compact desktop setups.

Built-In Headphone Amplifier

The integrated HiFi headphone amplifier can easily drive a wide range of headphones and earphones.

Headphone Performance:

• Maximum Output Power: 100mW @ 32Ω
• Recommended Headphone Impedance: 16Ω–200Ω

The amplifier delivers:

• Clear vocal reproduction
• Better headphone dynamics
• Improved detail retrieval
• Stronger audio immersion
• Clean low-noise playback

Compatible with:

• Wired headphones
• Gaming headsets
• In-ear monitors
• Portable audiophile headphones

High-Resolution Audio Playback

The Q4 supports high-quality digital audio decoding for improved sound performance compared to standard motherboard audio.

Audio Support:

USB Input:

• Up to 24bit / 96kHz

Optical & Coaxial Inputs:

• Up to 24bit / 192kHz

The DAC architecture provides:

• Low-jitter audio playback
• Improved sound clarity
• Better stereo imaging
• Cleaner detail reproduction
• More natural sound presentation

Perfect for:

• HiFi music listening
• Gaming audio
• Movie playback
• Streaming content

Bass & Treble Tone Controls

Customize your listening experience easily using the front-panel tone controls.

Adjustable Controls:

• Bass adjustment
• Treble adjustment
• Master volume control

The ±6dB EQ range allows users to:

• Enhance bass impact
• Improve vocal clarity
• Fine-tune brightness
• Match different headphones and speakers

Ideal for adapting sound to:

• Gaming
• Music genres
• Movies
• Personal preferences

Low-Noise HiFi Audio Performance

The Q4 is engineered with a clean low-noise audio design to protect connected equipment and improve overall sound quality.

Audio Performance:

• THD: 0.01%
• SNR: ≥105dB
• Frequency Response: 20Hz–20kHz

This results in:

• Reduced background noise
• Better signal clarity
• Lower distortion
• More enjoyable listening

The built-in output protection also helps safeguard expensive audio equipment.

Compact Desktop-Friendly Design

The Q4 features a compact footprint ideal for modern desktop environments.

Design Features:

• Mini compact chassis
• Easy-access front controls
• Lightweight desktop design
• Space-saving footprint
• Simple cable management

Perfect for:

• Home office desks
• Gaming stations
• Bedroom audio setups
• Small desktop HiFi systems

Technical Specifications

• Model: Q4
• Product Type: Desktop DAC & Headphone Amplifier
• USB Input Sampling Rate:
  • Up to 24bit / 96kHz
• Optical/Coaxial Sampling Rate:
  • Up to 24bit / 192kHz
• Frequency Response:
  • 20Hz–20kHz (±3dB)
• THD:
  • 0.01%
• SNR:
  • ≥105dB
• Headphone Output Power:
  • 100mW @ 32Ω
• Recommended Headphone Impedance:
  • 16Ω–200Ω
• RCA Output Level:
  • 2.3V
• EQ Adjustment Range:
  • ±6dB
• Inputs:
  • USB
  • Optical
  • Coaxial
• Outputs:
  • 3.5mm Headphone
  • RCA
• Power Supply:
  • DC5V
• Dimensions:
  • 73.5 × 98 × 33mm

Key Features

• USB DAC and headphone amplifier combo
• Plug-and-play desktop audio solution
• USB, optical & coaxial inputs
• RCA and headphone outputs
• Supports up to 24bit/192kHz audio
• Built-in headphone amplifier
• Bass and treble controls
• Compact desktop design
• Low-noise HiFi sound
• Compatible with PC, Mac & gaming systems