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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

4.3 4.3 out of 5 stars 2,624 ratings
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Purchase options and add-ons

Compatible devices Television, Amplifier, Headphone, Speaker
Specific uses for product Headphones, TV, PC
Connector type USB Type C, Coaxial
Colour Black
Item dimensions L x W x H 9.8 x 7.3 x 3.3 centimetres

About this item

  • Beginner-Friendly: The Q4 DAC headphone amplifier effortlessly connects to a range of home audio systems and headphones. It is a comprehensive solution to meet diverse needs and can convert optical/coaxial/PC-USB input digital signals into RCA headphone output analog signals for versatile connectivity.
  • Plug and Play: Simple to set up and requires no special software, app, or driver installation. Capable of delivering 160mW RMS of output power (32 Ohms, 20 Hz - 20 KHz, 0.01% THD), this desktop headphone amplifier can power headphones from 16 Ohms to 200 Ohms, making it ideal for PC/MAC/headphone/speaker systems controller.
  • Perfect for Gaming: ThisUSB DAC amp incorporates high-performance operational amplifier chips NE5532 from Texas Instruments. The device features very low noise, high output-drive capability, high unity-gain bandwidths, low distortion and high slew rate. Its excellent sound field will bring you an unparalleled sense of immersion.
  • Outstanding Build Quality: Mini compact DAC converter with a full metallic shell that ensures high quality. It streams bit-perfect 24bit/192KHz HD with low jitter(24bit/96KHz for USB), bass & treble controls provide pleasant tactile clicky sensation, with an output protection circuit to safeguard your expensive audio system.
  • What You Get: Q4 USB DAC x1, USB charging cable x1, optical cable x1, PC-USB to type B cable, User Manual x1, our worry-free 24-month warranty, as well as friendly customer service.

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Product details

  • Language ‏ : ‎ English
  • Product dimensions ‏ : ‎ 9.8 x 7.35 x 3.3 cm; 430 Grams
  • Date First Available ‏ : ‎ 19 July 2019
  • Manufacturer ‏ : ‎ Fosi Audio
  • ASIN ‏ : ‎ B07VDQQY95
  • Item Model Number ‏ : ‎ Q4
  • Country of origin ‏ : ‎ China
  • Customer Reviews:
    4.3 4.3 out of 5 stars 2,624 ratings

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Product Description

Q4 DAC Amp Headphone Amplifier Gaming Converter USB C Optical Coaxial RCA topping smsl fiio ifi
Literally Plug and Play

Fosi Audio Q4 DAC & Headphone Amplifier

A compact and lightweight, user-friendly desktop audio device.

Your Sound Perception Will be Revolutionized


Q4 is an entry-level all-in-one DAC and headphone amplifier. It is plug-and-play and does not require any driver. It has the characteristics of high signal-to-noise ratio and low distortion.

  • PC-USB Sampling Frequency: 24bit/96kHz
  • Optical/Coaxial Sampling Rates: 24bit/192kHz
  • SNR: >105dB; THD: 0.01%; Bass and Treble Range: ±6dB
  • Operation Systems: XP/Win7/Win8/Win10/Win11/MAC/Linux

Q4 DAC Amp Headphone Amplifier Gaming Converter USB C Optical Coaxial RCA topping smsl fiio ifi

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

Q4 DAC Amp Headphone Amplifier Gaming Converter USB C Optical Coaxial RCA topping smsl fiio ifi

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

Q4

K5 PRO

K5 PRO

SK01

SK01

SK02

SK02

DS2

DS2

DS1

DS1

N3

N3

Customer Reviews
4.3 out of 5 stars
2,624
4.2 out of 5 stars
537
4.6 out of 5 stars
89
4.4 out of 5 stars
16
4.0 out of 5 stars
43
4.3 out of 5 stars
177
Price
$79.99 $89.99 $119.99 $159.99 $99.99 $79.99
Type
DAC+ Headphone Amp DAC+ Headphone Amp Headphone Amp+Equalizer Headphone Amp+Equalizer DAC+ Headphone Amp DAC+ Headphone Amp Portable Headphone Amp
MAX Power Output
250mw@32Ω 500mw@32Ω 2400mW@32 Ohm 3.5MM: 280mW/4.4MM: 1100mW@32Ω 130mW(SE); 510mW(BAL) 120mW(SE); 220mW(BAL) 138mW @32Ω; 15mW @300Ω
Input
USB + Optical + Coaxial USB-C+OPT+COA+Microphone 3.5mm AUX USB/OPT Type C Type C Blueooth + AUX
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
Treble & Bass Control
THD
≤ 0.01% <0.003% ≤ 0.001% ≤ 0.001% ≤ 0.0002%(SE) ≤ 0.001%(BAL) ≤ 0.0006%(SE) ≤ 0.001%(BAL) ≤ 0.001%
SNR
≥ 105dB >110dB ≥ 108dB 3.5mm: 120dB/4.4mm: 115dB ≥126dB ≥120dB ≥ 95dB
Terminating Impedance
16-200 Ohms 16-300 Ohms 16-300 Ohms 16-300 Ohms 16-300 Ohms 16-300 Ohms 16-300 Ohms

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Customer reviews

4.3 out of 5 stars
4.3 out of 5
2,624 global ratings

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Customers say

Customers like the sound quality and value of the adapter. They mention that it has good sound, the bass and treble knobs are nice, and the noise floor is zero. They appreciate the playback being very dynamic and the music doesn't stop when the screen goes to sleep. However, some disagree on performance.

AI-generated from the text of customer reviews

17 customers mention13 positive4 negative

Customers like the sound quality of the adapter. They say the bass and treble knobs are nice and have geared steps. They also mention that the playback is very dynamic and the noise floor is zero.

"...No complaints all, plenty of power and full range audio." Read more

"...But, the bass and treble knobs are nice as they have 'geared' "steps", and the device is wired, so you won't have any broken charging ports or..." Read more

"...to a DVD player with Internet/YouTube capability,the playback was very dynamic and noise floor was zero...." Read more

"I'm no audiophile, but my impression is that my music definitely sounds better with the DAC driving to my speakers instead of the Headphones out on..." Read more

9 customers mention9 positive0 negative

Customers find the adapter fantastic, worth the buy, and good value for the price. They also say it does the job well and is a great DAC.

"For the price of this DAC it is really good value for money if you are after a beginner DAC is plug and play and comes with the instructions on how..." Read more

"...amplifier and saw this, decided to buy it and was blown away with the quality for its price. Arrived very fast, would highly recommend this!" Read more

"Definitely worth the buy in the current price bracket...." Read more

"Fantastic little item for the price. Purchased to enjoy louder volume from cans when my favourite jams are playing" Read more

3 customers mention3 positive0 negative

Customers find the installation of the adapter to be easy. They mention that it comes with instructions on how to use it and that it is plug and play.

"...money if you are after a beginner DAC is plug and play and comes with the instructions on how to use it great beginner DAC (once again for the price)" Read more

"Cheap with great sound, easy to install and use. Enhances the sound of my DT 770 Pro over motherboard sound." Read more

"Audio is passed through really well, no issues with setup using USB connection." Read more

8 customers mention5 positive3 negative

Customers are mixed about the performance of the adapter. Some mention that it works well, while others say that it only works for around 5 minutes and is not very powerful.

"Works nicely as a reliable, easy to use volume adjustor for my computer. But it has a couple issues..." Read more

"...I am using it in an audiophile hifi system and the result was excellent." Read more

"I had this DAC/AMP combo running my Fidelio X1S and it worked well... until I found the RCA outs weren't working later after some use, but I won't..." Read more

"Works Great for my use case...." Read more

Top reviews from Australia

Reviewed in Australia on 12 April 2024
Colour Name: BlackVerified Purchase
Needed one of these to connect my Akai 4k tv to drive headphones as the only audio output on the tv was optical. No complaints all, plenty of power and full range audio.
Reviewed in Australia on 23 June 2022
Colour Name: BlackVerified Purchase
For the price of this DAC it is really good value for money if you are after a beginner DAC is plug and play and comes with the instructions on how to use it great beginner DAC (once again for the price)
One person found this helpful
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Reviewed in Australia on 4 August 2023
Colour Name: BlackVerified Purchase
Works nicely as a reliable, easy to use volume adjustor for my computer. But it has a couple issues

-While adjusting volume, it seems to 'float' between left/right biased sound. This is annoying because it means you need to tinker with it a bit to get the sound set right, but the fix is just adjusting it a bit here and there

-If you turn the volume all the way down, then past a "click", the device will turn completely off. Turning the device/volume back on means you'll be waiting a bit for windows to reconfigure the sound settings etc.
Not a big deal, but it would be better if there was a switch for power instead

-A bit of static at very high volume -- your computer/game volume might be quiet, so if you adjust the knob to a high setting, then there will be a (small) bit of static.

But, the bass and treble knobs are nice as they have 'geared' "steps", and the device is wired, so you won't have any broken charging ports or bloated batteries.
Reviewed in Australia on 28 February 2023
Colour Name: BlackVerified Purchase
When connected to a DVD player with Internet/YouTube capability,the playback was very dynamic and noise floor was zero.I am using it in an audiophile hifi system and the result was excellent.
4 people found this helpful
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Reviewed in Australia on 1 October 2021
Colour Name: BlackVerified Purchase
I had this DAC/AMP combo running my Fidelio X1S and it worked well... until I found the RCA outs weren't working later after some use, but I won't dock any stars considering that these things happen.

The problem is that there are much better combos you could get for the price like the KGUSS DAC-K3 Pro or Aiyima DAC-A5 Pro. They are much better at driving more power hungry headphones and without doubt have better componentry. They can both be had for ~$80 on AliExpress, only $10 more than Fosi is asking for this bottom tier DAC/AMP combo.

I also didn't like that the only way to power it on or off is to turn the volume all the way down, and with the knob being smooth with no tactile steps you can never quite get the volume in that sweet spot you had it at before without some fiddling.

It's not bad, but there's better options for the same price category.
8 people found this helpful
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Reviewed in Australia on 12 July 2021
Colour Name: BlackVerified Purchase
I'm no audiophile, but my impression is that my music definitely sounds better with the DAC driving to my speakers instead of the Headphones out on my Monitor via HDMI. An additional benefit is that my music doesn't stop when my screen goes to sleep.

Haven't really used the headphones jack, so cannot comment if it's better than direct output from my laptop, but I suspect it would be given the quality difference I have with my speakers.
One person found this helpful
Report
Reviewed in Australia on 23 November 2022
Colour Name: BlackVerified Purchase
Had to replace my old headphone amplifier and saw this, decided to buy it and was blown away with the quality for its price. Arrived very fast, would highly recommend this!
Reviewed in Australia on 13 January 2024
Colour Name: BlackVerified Purchase
Sounds fine, as good as my computers speaker out, but much better than the headphone socket on my screen. The main thing is that it has plenty of power for headphones, I only need to turn up half way for it to be too loud. which is good because, in my case at least, above that i can hear noise, which is coming from the power side of things, i was able to make it quite a bit less audible by using a high quality usb wall wart, though it really doesn't matter, as I can only hear the noise if it's turned up too high. It does require an amp or powered speakers, if you want to use those, I think that's why in other reviews I've seen people say it's too quiet, I think they're plugging speakers straight into it, and it doesn't work like that. I'm very happy with the purchase, and it came with nice optical and usb cables. The optical and the usb sound about that same btw.
One person found this helpful
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Top reviews from other countries

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Maria Puga Flores
5.0 out of 5 stars Calidad y mejora de audio en mini componente sony
Reviewed in Mexico on 1 November 2023
Colour Name: BlackVerified Purchase
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.
Customer image
Maria Puga Flores
5.0 out of 5 stars Calidad y mejora de audio en mini componente sony
Reviewed in Mexico on 1 November 2023
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.
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One person found this helpful
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Mike Kay
5.0 out of 5 stars Amazing Device! DAC & Preamp, Volume Adjustment! Works with SHIELD Pro 2019!
Reviewed in Canada on 13 February 2022
Colour Name: BlackVerified Purchase
I bought this because I needed a way to watch my movies at night while the little one sleeps. Let me tell you about the rabbit hole of options that I had ventured into. I tried Avantree Dual BT options (range was brutal), I tried USBc DACs with basic 3.5mm only out(sound quality was not good). This was the best option... yes the wires are not ideal. But let me tell you its worth the sacrifice! You can buy little inline volume controls and have a silent movie night with up to 4 people. I understand these might not be a typical problem many have but sometimes the simplest problems bring the most complicated solutions.

Packaging and weight of the device are awesome has bass and treble fine adjustments which is awesome for headphones. This thing is loud, even when split into two earbuds. I imagine you could easily do up to 4 without loss of line gain.

I am using this with a SHIELD 2019 Pro and it picks it up and is plug and play. I imagine anything with android 11+ can pick it up as well. Switching between inputs is easy and well! I will update on the longevity of the device when I get to the 6 month mark. There is a 1.5 year warranty of the device not sure through who, but its a warm fuzzy feeling if warranties are your thing.

BONUS: My 18 month old child unpackaged the box, so you could call it frustration free packaging ;)

I am an audiophile with speakers in my whole home and used to install car audio equipment.

This is an excellent device for anyone trying to solve the usb/opt out audio streams to multiple headphones. Or just trying to get a little more gain from your headphones for gaming.
Customer image
Mike Kay
5.0 out of 5 stars Amazing Device! DAC & Preamp, Volume Adjustment! Works with SHIELD Pro 2019!
Reviewed in Canada on 13 February 2022
I bought this because I needed a way to watch my movies at night while the little one sleeps. Let me tell you about the rabbit hole of options that I had ventured into. I tried Avantree Dual BT options (range was brutal), I tried USBc DACs with basic 3.5mm only out(sound quality was not good). This was the best option... yes the wires are not ideal. But let me tell you its worth the sacrifice! You can buy little inline volume controls and have a silent movie night with up to 4 people. I understand these might not be a typical problem many have but sometimes the simplest problems bring the most complicated solutions.

Packaging and weight of the device are awesome has bass and treble fine adjustments which is awesome for headphones. This thing is loud, even when split into two earbuds. I imagine you could easily do up to 4 without loss of line gain.

I am using this with a SHIELD 2019 Pro and it picks it up and is plug and play. I imagine anything with android 11+ can pick it up as well. Switching between inputs is easy and well! I will update on the longevity of the device when I get to the 6 month mark. There is a 1.5 year warranty of the device not sure through who, but its a warm fuzzy feeling if warranties are your thing.

BONUS: My 18 month old child unpackaged the box, so you could call it frustration free packaging ;)

I am an audiophile with speakers in my whole home and used to install car audio equipment.

This is an excellent device for anyone trying to solve the usb/opt out audio streams to multiple headphones. Or just trying to get a little more gain from your headphones for gaming.
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2 people found this helpful
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Liviu a.
5.0 out of 5 stars Divino
Reviewed in Spain on 10 May 2024
Colour Name: BlackVerified Purchase
Me ha gustado mucho amplifica un monton y se escucha muy muy bien! Por este precio no se puede pedir mas!
Andrea Sperelli
5.0 out of 5 stars Buonissima qualità del suono
Reviewed in Italy on 26 February 2024
Colour Name: BlackVerified Purchase
Ho collegato il DAC ad un vecchio lettore DVD tramite cavo coassiale e ad un vecchio MacBook Air tramite USB. Funziona perfettamente e la qualità del suono è davvero ottima. La costruzione sembra di ottima fattura e la regolazione di bassi e alti funziona perfettamente. È anche carino sulla scrivania e adesso posso regolare il volume di entrambe la fonti dallo stesso punto. Rapporto qualità/prezzo eccezionale.
Erik
5.0 out of 5 stars Good!
Reviewed in Sweden on 31 December 2023
Colour Name: BlackVerified Purchase
Since it fully turns off when volume is set to 0, you can use separate speakers that don't go through this unit as secondary audio source. They drive all my cans. 5/5
One person found this helpful
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