Having previously purchased two ‘cheap’ DAC Converter units and really struggled to get any decent level of sound through them, I decided to bite the bullet and pay a bit more for the Fosi Audio Q4 Headphone Amplifier DAC Converter. I am using this unit with a TosLink optical cable and it has exceeded all my expectations. This little device punches above its weight and delivers a remarkable listening experience that I think would be hard to match in its price range.
It is a very compact and sturdy design, with a solid and premium feel to it.
I am using this device with an LG Smart TV that is fitted into a bed unit (so TV rises from foot of the bed). As such, we only ever use this TV with headphones, so achieving decent sound through headphones is essential to us. As previously mentioned, I had struggled to get any decent level of sound through two cheaper versions of DAC converters (the sound levels were so quiet we had resorted to always using subtitles when watching TV), but I just left the cables in place that were used with those and plugged them into the Fosi unit – which clearly showed me there was nothing wrong with the cables I had been using and the issue was with the cheap DAC units. With the Fosi unit, everything works brilliantly and the sound quality and levels are awesome. I am not using particularly expensive headphones – they are wired and have an impedance value of 32 – which should have been good enough with the original ‘cheap’ DAC converter but simply wasn’t
The Fosi Audio Q4 Headphone Amplifier DAC Converter is an absolute gem – although it should be noted I have only tried connecting via Toslink optical cable so cannot comment on other connection options. It’s hard to believe that such a small, affordable device can provide this level of audio performance. Highly recommended!
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This item: Fosi Audio Q4 Headphone Amplifier DAC Converter, Mini Stereo Digital-to-Analog DAC Amp, USB Coaxial Optical to 3.5MM AUX RCA Jack, for Computer Desktop Powered Active Speakers Up to 24 bit/192 kHz
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Product Description
Fosi Audio Q4 DAC & Headphone Amplifier
Fosi Audio Q4 DAC & Headphone Amplifier
A compact and lightweight, user-friendly desktop audio device.
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Accommodate Various Home Audio Systems
Equipped with USB/Optical/Coaxial inputs and RCA/Headphone outputs for diverse connection needs.
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DAC + Headphone Amplifier
Suitable for 16-200 Ohm headphones
A compact, lightweight, and user-friendly desktop device that adapts to your varied needs.
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A Little Gem for Music Lovers
SNR up to 105dB keeps the sound clear and pure at all times and effectively resists interference.
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Perfect for Gaming
Low latency and an outstanding sound stage provide an incomparable feeling of immersion.
3.5mm Headphone Output
Boosts headphone performance and enhances audio quality by delivering higher current and voltage output.
- Headphone output power: 250mW (32Ω load)
- Headphone matching impedance: 16-200Ω
Exquisite Craftsmanship
The corners are treated to safeguard against scratches from sharp metal edges, while the entire device is constructed from sturdy and durable all-aluminum alloy.
Parameter Comparison
 Q4 |  K5 PRO |  SK01 |  SK02 |  DS1 |  DS2 |  PH05 | |
|---|---|---|---|---|---|---|---|
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Customer Reviews
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2,947
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1,029
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302
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194
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527
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527
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67
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Price
| £69.07 | £77.77 | £79.99 | £99.99 | £77.99 | £62.99 | £49.99 |
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Type
| DAC+ Headphone Amp | DAC+ Headphone Amp | Headphone Amp+Equalizer | Headphone Amp+Equalizer | DAC+ Headphone Amp | DAC+ Headphone Amp | 5.0 CH Headphone Amp |
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MAX Power Output
| 250mw@32Ω | 500mw@32Ω | 2400mW@32 Ohm | 3.5MM: 280mW/4.4MM: 1100mW@32Ω | 120mW(SE); 220mW(BAL) | 130mW(SE); 170mW(BAL) | 310mW@32 Ohm/36mW@300 Ohm |
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Input
| USB + Optical + Coaxial | USB-C+OPT+COA+Microphone | 3.5mm AUX | USB/OPT | Type C | Type C | 3.5mm AUX |
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Output
| RCA + 3.5mm Headphone | RCA + 3.5mm Headphone | 3.5mm AUX+6.35mm Headphone | 3.5mm/4.4mm HP+3.5mm AUX/OPT | 3.5mm + 4.4mm Headphone | 3.5mm + 4.4mm Headphone | 3.5mm Headphone*5 |
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Treble & Bass Control
| ✔ | ✔ | ✔ | ✘ | ✘ | ✘ | ✘ |
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THD
| ≤ 0.01% | <0.003% | ≤ 0.001% | ≤ 0.001% | ≤ 0.0006%(SE) ≤ 0.001%(BAL) | ≤ 0.0002%(SE) ≤ 0.001%(BAL) | 0.001% |
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SNR
| ≥ 105dB | >110dB | ≥ 108dB | 3.5mm: 120dB/4.4mm: 115dB | ≥120dB | ≥130dB | 105db |
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Terminating Impedance
| 16-200 Ohms | 16-300 Ohms | 16-300 Ohms | 16-300 Ohms | 16-300 Ohms | 16-300 Ohms | 16-300 Ohms |
Using with my PC - just what I was looking for, 5-stars
Why did you choose this product over others?: Reviews on Amazon and YT. Functionality: I'm very happy with the Q4 and the sound quality. I'm using it with my PC and if gives both a better sound out than the motherboard DAC and also, the thing I was really looking for, was the ease of controlling bass and treble on the fly. The unit is well made with a metal casing but it is quite small and relatively light so the rear cables can't be left to hang from the back otherwise the unit will likely tilt up.
Top reviews from United Kingdom
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- Reviewed in the United Kingdom on 19 November 2024
- Reviewed in the United Kingdom on 22 January 2022
I asked the question if this would work as a gaming DAC and output sound to my headphones and still have the ability to mic into the motherboard of my PC.
I was told no but I can say that this setup configuration works without issues for me. (Runbing Windows 10, b550 motherboard, V-moda BoomPro mic, Philips shp9500, splitter cable).
I was advised by a friend, researched throughly and came to the conclusion that this would be a good quality setup. The addition of this DAC has made it a perfect gaming setup for me and at a good overall cost.
PROS:
• this DAC played a part in delivering better performance than most gaming headsets.
• I didn't think that bass and treble control would be very useful but I now find myself regularly tweaking them in various situations to optimise game sound and music to my taste.
• Nice weight to the unit yet quite compact in size.
• Control dials have a nice quality feel to them.
• Noticeable cleaner sound when compared to motherboard output.
• Good sound stage which is perfect for gaming.
• I HAVE NO PROBLEMS WITH MIC INTO MOTHERBOARD WHILST USING USB TO DAC.
CONS:
• For convenience only, it would have been nice to have the mic pass through without having to split into mobo.
CONCLUSION:
I would definitely recommend this to anyone looking for a decent gaming sound experience at a good price point.
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Top reviews from other countries
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Victor A.Reviewed in France on 10 December 2020
Parfait pour driver mon DT 770 Pro
- NobodyReviewed in the United States on 21 April 2023
A tenative review, we'll see if it lives. Let's give it the final star.
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Vincenzo CapizziReviewed in Italy on 26 June 2025
Perfetto per giocare se le vostre cuffie hanno un audio limitato
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Maria Puga FloresReviewed in Mexico on 1 November 2023
Calidad y mejora de audio en mini componente sony
Lo use para conectar la tv a un estéreo sony genezi fst-2000, la tv al fosi audio q4 lo conecte a través del cable óptico y luego del dac fosi q4 al estéreo sony genezi vía rca. El audio mejor notablemente y lo mejor fue que se se pudo ecualizar los agudos que es el motivo principal por el que adquirí este equipo ya que el sony fst-2000 daba un sonido de audio con graves muy fuertes, con este equipo solucione mi problema de los agudos y se escucha muy bien. Ya puedo ecualizar la música a mi gusto graves, agudos y volumen. Recomiendo este equipo si lo buscas para un propósito similar, su diseño es pequeño cabe en la palma de la mano es bueno porque no es voluminoso y cabe en cualquier lugar para instalarse, los materiales son robustos y de calidad. Como fuente de energía utilice la entrada usb de 500mA 5v de mi tv y levanto sin problema al equipo dac fosi q4.Maria Puga FloresCalidad y mejora de audio en mini componente sony
Reviewed in Mexico on 1 November 2023
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