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
£71.73
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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
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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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
| 250ɰ32Ω | 500ɰ32Ω | 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 | ≥120 | ≥130 | 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 |
