Fosi Audio · microphone DACs & amplifiers
USB DAC and Q4 stereo headphone amplifier
The audio output of a PC often lacks clarity and power for headphones. This Fosi Audio Q4 DAC decodes the digital signal into clean analog and powers headphones or active speakers, delivering noticeably clearer sound at your desk.
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Product details
In use, this small case transforms computer audio. It is a digital-to-analog converter (DAC) paired with a headphone amplifier: connected via USB, optical (Toslink), or coaxial S/PDIF, it decodes the digital stream with its dedicated chips and delivers clearer, more detailed sound than the PC's built-in output. Its headphone output drives most headphones from 16 to 200 ohms (power of approximately 100 mW at 32 Ω), and a bass and treble adjustment (±6 dB) tailors the sound to your preference. Its RCA output (2.3 V) connects it to an amplifier or active speakers, and it can serve as a preamplifier or volume control for the PC/Mac. It handles high-definition streams up to 24 bits/192 kHz (optical/coaxial; 24 bits/96 kHz via USB). Plug and play, without drivers or software, on Windows, macOS, and Linux. Compact aluminum case, powered by USB 5 V, with output protection circuit. Supplied with USB and optical cables. Enjoy clear and powerful computer sound, on headphones or speakers.
Compatibility and uses
This DAC + headphone amplifier connects to a computer (Windows XP/7/8/10, macOS, Linux) via USB, or to any source with an optical (Toslink) or coaxial S/PDIF output (box, console, TV, player). Its RCA output connects to an amplifier or active speakers. The headphone output is suitable for headphones from 16 to 200 ohms. It decodes up to 24 bits/192 kHz via optical/coaxial (24 bits/96 kHz via USB). Plug and play, no drivers needed. Powered by USB 5 V, aluminum case. Supplied with a USB power cable, a PC-USB cable, an optical cable, and a manual. Connect your chosen digital source and connect headphones or speakers to the output.
Technical specifications
- Brand: Fosi Audio
- Model: Q4
- Type: USB DAC + headphone amplifier (stereo)
- Inputs: USB, optical (Toslink), coaxial S/PDIF
- Output: Headphone + RCA line (2.3 V)
- Resolution: 24 bits/192 kHz (optical/coax), 24 bits/96 kHz (USB)
- Compatible headphones: 16 to 200 Ω (≈ 100 mW at 32 Ω)
- Adjustments: Bass and treble (±6 dB), volume
- Operational amplifier: NE5532
- Quality: THD 0.01 %, SNR ≥ 105 dB
- Power supply: USB 5 V, aluminum case
- Installation: Plug and play (no driver)
- Weight: 0.5 kg
Usage advice
Team advice: designed for headphones from 16 to 200 Ω; for very demanding headphones, its power (~100 mW) remains modest.
Presentation
The Fosi Audio Q4 decodes digital sound from a PC or an optical/coaxial source and sends it, clearer, to headphones (16-200 Ω) or active speakers (RCA output). Bass/treble adjustment, up to 24 bits/192 kHz, THD 0.01 %. Plug and play, aluminum case powered by USB. Supplied with USB and optical cables.
Key features
- DAC + headphone amplifier: Clearer sound than the PC output.
- 3 inputs: USB, optical, coaxial S/PDIF.
- RCA output: To amplifier or active speakers.
- Bass/treble adjustment: ±6 dB, plug and play.
For whom?
For anyone wanting better sound on a PC or Mac, on headphones or active speakers. And for those starting out in desktop hi-fi.
Frequently asked questions
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Frequently asked questions
Is a driver required?
No, it is plug and play under Windows, macOS, and Linux.
What inputs?
USB, optical (Toslink) and coaxial S/PDIF.
Which helmets does it drive?
Headphones from 16 to 200 ohms (approximately 100 mW under 32 Ω).
What resolution?
Up to 24 bits/192 kHz via optical/coaxial, 24 bits/96 kHz via USB.
Can speakers be connected?
Yes, via the RCA output, to an amplifier or active speakers.
What's in the box?
The Q4, a USB power cable, a PC-USB cable, an optical cable, and a manual.
