---
product_id: 146629540
title: "Fosi Audio Q4 DAC Headphone Amp for PC, Desktop Digital to Analog Audio Converter for Home Stereo Amplifier and Powered Speakers, PC-USB/Optical/Coaxial Inputs, 3.5mm Headphone/RCA Outputs"
brand: "fosi audio"
price: "€ 139.83"
currency: EUR
in_stock: true
reviews_count: 8
category: "Fosi Audio"
url: https://www.desertcart.fr/products/146629540-fosi-audio-q4-dac-headphone-amp-for-pc-desktop-digital
store_origin: FR
region: France
---

# 24-bit/192kHz HD audio USB/Optical/Coaxial inputs Adjustable bass & treble knobs Fosi Audio Q4 DAC Headphone Amp for PC, Desktop Digital to Analog Audio Converter for Home Stereo Amplifier and Powered Speakers, PC-USB/Optical/Coaxial Inputs, 3.5mm Headphone/RCA Outputs

**Brand:** fosi audio
**Price:** € 139.83
**Availability:** ✅ In Stock

## Summary

> 🎧 Elevate your sound game—because your ears deserve the best.

## Quick Answers

- **What is this?** Fosi Audio Q4 DAC Headphone Amp for PC, Desktop Digital to Analog Audio Converter for Home Stereo Amplifier and Powered Speakers, PC-USB/Optical/Coaxial Inputs, 3.5mm Headphone/RCA Outputs by fosi audio
- **How much does it cost?** € 139.83 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/products/146629540-fosi-audio-q4-dac-headphone-amp-for-pc-desktop-digital)

## Best For

- fosi audio enthusiasts

## Why This Product

- Trusted fosi audio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Tailor Your Sound:** Precision bass and treble controls let you customize your audio vibe on the fly.
- • **Compact Powerhouse:** Sleek metal shell packs premium 24-bit/192kHz sound quality into a space-saving design.
- • **Ready Out of the Box:** Includes all essential cables for quick, hassle-free setup—start listening like a pro immediately.
- • **HiFi Audio, Zero Fuss:** Plug-and-play setup with no driver hassle—instant upgrade for your desktop or home stereo.
- • **Versatile Connectivity:** Seamlessly switch between USB, Optical, and Coaxial inputs to power your headphones or speakers.

## Overview

The Fosi Audio Q4 is a compact, entry-level DAC and headphone amplifier designed for professionals seeking superior audio clarity. Supporting 24-bit/192kHz high-definition sound with USB, Optical, and Coaxial inputs, it drives headphones from 16Ω to 200Ω and outputs via 3.5mm and RCA. Its metal chassis ensures durability, while adjustable bass and treble controls provide personalized sound tuning. Plug-and-play convenience and included cables make it an instant upgrade for desktop and home stereo setups.

## Description

Buy Fosi Audio Q4 DAC Headphone Amp for PC, Desktop Digital to Analog Audio Converter for Home Stereo Amplifier and Powered Speakers, PC-USB/Optical/Coaxial Inputs, 3.5mm Headphone/RCA Outputs: Amplifiers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: I love it! The audio is fantastic! Great little piece of equipment. - I love this! Listening to music and watching movies on my PC using spatial sound is great. The quality of the sound is superb! My two slight complaints are as follows: 1) To power the unit you have to use a USB slot on your PC which seems like a waste. It might be possible to use a phone charger and plug it into the wall, I haven't tried that yet. 2) The knobs could be ever so slightly bigger. But that is it. I had no issues hooking it up, it works great and I'm very satisfied with the audio. I'm using it on a Windows 11 PC in Secure Boot with no issues. One of the main reasons why I bought it was to be able to turn the volume up or down on the fly without having to go into Windows to adjust the sound. Sometimes if you're scrolling through videos online, one might be quiet and another might be loud. This is a very useful feature. Overall, great value for the money!
Review: A tenative review, we'll see if it lives. Let's give it the final star. - After losing five $20-30 headphone amplifiers in a row, within days or weeks, just because we're tripling the cost here doesn't necessary mean this will do better. In the q&a section one person warned me it died within two months, another person says it's been running for two years. Why a solid state device should have any life is beyond me, my beloved 50+ year old Nakamichi RE-3 receiver is still running fine. My question was, since this does not have a 3.5 audio input, can it be fed by a PC into the coaxial input with a converter? Four people said yes, one said no. It's no. So, what use is a 3.5 to coaxial conversion plug? Never mind. Since I cannot get my Dell running Windows 10 to put any sound into this through the USB route, it's useless, to me at least, as a PC headphone driver. One of the days I suppose I should get the headphone jack fixed, it's dead for some reason. Still working on that, the last headphone amp I had died, so my PC is going through the Nakamichi for awhile, rather clumsy. I also need an amp for my new Vizio TV. It also has a 3.5 audio out, forget about that. Therefore, I hooked up the optical input, and nothing, no sound at all. I checked all the connections, seemed to be okay, but just before I ripped it out to send it back to Azon, the darn thing turned on. Is there a warm-up delay?? It will be on all the time, so hopefully it will keep running. One other slight problem, the cords are absurdly too short, the optical cable isn't even as long as my TV. No biggie of course, but if you're going to put cords in the box, at least make them long enough to be useful. So, I'll live with this for awhile, and then edit the review . . . one way or the other. Ed: One thing, normally I set the volume control at about 75% on everything, and adjust the volume to my earphones through an in-line control. When set like that, I was picking up sputtering sounds on some Youboob videos, but it was fine on video files played from a USB stick (the only two ways I use the TV). Youevil volumes are much higher than typical USB files, I knew that, and the USB files play fine. I was not picking up any problems on my PC, so I switched out everything, the in-line volume wheel controls, the earphones, both combinations, and it was definitely something in the TV audio. I turns out I had the volume set waaaay too high on the Fosi box, with the in-line control taken out, the headphones were blasting. I played around with the volume knob, and lo and behold, the sputtering sounds went away. I had to fine tune it so the in-line control had enough room with both Eviltube and USB sources, which worked out to be around 55%. If you're having problems, you might try turning it down. Note, the variable audio output on my TV does not work if you plug in something to the optical output, so unless you want to get up off the couch every 30 seconds to adjust the Fosi volume, in-line controls are a must for my setup. They're very cheap, but buy them by the handful, they wear out. They work very well with YT when you run into a commercial, you can cut the volume to zero instantly. Ed: I'll bump it a star, for two reasons. First, the original unit I bought is still alive, and in the headphone amplifier world, that seems to be a real accomplishment. And, I bought another one for my 2015 Vizio, now relegated to the bedroom, and it fired up and worked as well, on optical. So now I have two of them, and I'll see how long they last. Maybe someday down the road this will get the final star. Also wik: Two months now, one is on 24/7, the other with the second TV off and on. No problems. That should be long enough for any glitches to show up. Update: Over two years now, it's on all the time, and it still works.

## Features

- Versatile Entry-Level: The Fosi Audio Q4 is an entry-level DAC and headphone amp, featuring USB, Optical, and Coaxial inputs, plus RCA and 3.5mm outputs. It drives headphones from 16Ω to 200Ω, enhances audio quality, and connects to speakers or amplifiers
- Plug-and-Play Convenience: Instant HiFi audio with no driver installation. Connect to TVs, computers, speaker systems, or DVD players. Compact design fits anywhere, offering ultimate audio freedom
- Bass and Treble Controls: Adjustable bass and treble knobs for fine-tuning sound. Natural feel with smooth volume adjustment. High-quality metal knobs for a premium experience. Optimize audio for any source
- Compact and High-Quality: Compact DAC converter with full metallic shell. Supports 24-bit/192kHz HD audio with low jitter. Includes output protection circuit for system safety
- Complete Accessories: Includes USB charging cable, optical cable, and PC-USB to Type-B cable. Ensures hassle-free setup and immediate use. Seamless connectivity for various devices. (Note: No microphone input.)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07VDQQY95 |
| Best Sellers Rank | #9,769 in Electronics ( See Top 100 in Electronics ) #11 in Headphone Amps #39 in Audio Component Amplifiers |
| Brand | Fosi Audio |
| Brand Name | Fosi Audio |
| Customer Reviews | 4.4 out of 5 stars 3,252 Reviews |
| Included Components | User Guide |
| Interface | Coaxial, Optical, USB |
| Interface Type | Coaxial, Optical, USB |
| Item Dimensions L x W | 3.9"L x 2.9"W |
| Item Weight | 430 Grams |
| Manufacturer | Fosi Audio |
| Material Type | Metal |
| Maximum Supply Voltage | 5 Volts (DC) |
| Minimum Supply Voltage | 5 Volts (DC) |
| Mounting Type | Tabletop Mount |
| Number of Channels | 1 |
| Number of Pins | 11 |
| Unit Count | 1.0 Count |
| Warranty Description | 24-month warranty |

## Product Details

- **Brand:** Fosi Audio
- **Maximum Supply Voltage:** 5 Volts (DC)
- **Minimum Supply Voltage:** 5 Volts (DC)
- **Mounting Type:** Tabletop Mount
- **Number of Pins:** 11

## Images

![Fosi Audio Q4 DAC Headphone Amp for PC, Desktop Digital to Analog Audio Converter for Home Stereo Amplifier and Powered Speakers, PC-USB/Optical/Coaxial Inputs, 3.5mm Headphone/RCA Outputs - Image 1](https://m.media-amazon.com/images/I/51ahAHhZF6L.jpg)

## Questions & Answers

**Q: Can Q4 output analog stereo audio through both the 3.5mm headphone jack and the RCA red/white jacks at the same time?**
A: Q4 will mute the RCA output when headphones are plugged in.

**Q: How do I connect Q4 to my computer with USB input?**
A: Your other USB cables must support OTG function. -For iPhone: Use a USB B to Lightning OTG Cable. -For Android: Use a USB B to TYPE C Cable.

**Q: Where is the 0db position (Q4)?**
A: The 0db position is at 12 o'clock on the knob.

**Q: Does Q4 support PS5?**
A: Yes, it supports PS5.

**Q: Can RCA output be connected to a soundbar (e.g., AUX input) (Q4)?**
A: Yes, it can work.

## Customer Reviews

### ⭐⭐⭐⭐⭐ I love it! The audio is fantastic! Great little piece of equipment.
*by W***M on February 21, 2026*

I love this! Listening to music and watching movies on my PC using spatial sound is great. The quality of the sound is superb! My two slight complaints are as follows: 1) To power the unit you have to use a USB slot on your PC which seems like a waste. It might be possible to use a phone charger and plug it into the wall, I haven't tried that yet. 2) The knobs could be ever so slightly bigger. But that is it. I had no issues hooking it up, it works great and I'm very satisfied with the audio. I'm using it on a Windows 11 PC in Secure Boot with no issues. One of the main reasons why I bought it was to be able to turn the volume up or down on the fly without having to go into Windows to adjust the sound. Sometimes if you're scrolling through videos online, one might be quiet and another might be loud. This is a very useful feature. Overall, great value for the money!

### ⭐⭐⭐⭐⭐ A tenative review, we'll see if it lives. Let's give it the final star.
*by N***Y on April 21, 2023*

After losing five $20-30 headphone amplifiers in a row, within days or weeks, just because we're tripling the cost here doesn't necessary mean this will do better. In the q&a section one person warned me it died within two months, another person says it's been running for two years. Why a solid state device should have any life is beyond me, my beloved 50+ year old Nakamichi RE-3 receiver is still running fine. My question was, since this does not have a 3.5 audio input, can it be fed by a PC into the coaxial input with a converter? Four people said yes, one said no. It's no. So, what use is a 3.5 to coaxial conversion plug? Never mind. Since I cannot get my Dell running Windows 10 to put any sound into this through the USB route, it's useless, to me at least, as a PC headphone driver. One of the days I suppose I should get the headphone jack fixed, it's dead for some reason. Still working on that, the last headphone amp I had died, so my PC is going through the Nakamichi for awhile, rather clumsy. I also need an amp for my new Vizio TV. It also has a 3.5 audio out, forget about that. Therefore, I hooked up the optical input, and nothing, no sound at all. I checked all the connections, seemed to be okay, but just before I ripped it out to send it back to Azon, the darn thing turned on. Is there a warm-up delay?? It will be on all the time, so hopefully it will keep running. One other slight problem, the cords are absurdly too short, the optical cable isn't even as long as my TV. No biggie of course, but if you're going to put cords in the box, at least make them long enough to be useful. So, I'll live with this for awhile, and then edit the review . . . one way or the other. Ed: One thing, normally I set the volume control at about 75% on everything, and adjust the volume to my earphones through an in-line control. When set like that, I was picking up sputtering sounds on some Youboob videos, but it was fine on video files played from a USB stick (the only two ways I use the TV). Youevil volumes are much higher than typical USB files, I knew that, and the USB files play fine. I was not picking up any problems on my PC, so I switched out everything, the in-line volume wheel controls, the earphones, both combinations, and it was definitely something in the TV audio. I turns out I had the volume set waaaay too high on the Fosi box, with the in-line control taken out, the headphones were blasting. I played around with the volume knob, and lo and behold, the sputtering sounds went away. I had to fine tune it so the in-line control had enough room with both Eviltube and USB sources, which worked out to be around 55%. If you're having problems, you might try turning it down. Note, the variable audio output on my TV does not work if you plug in something to the optical output, so unless you want to get up off the couch every 30 seconds to adjust the Fosi volume, in-line controls are a must for my setup. They're very cheap, but buy them by the handful, they wear out. They work very well with YT when you run into a commercial, you can cut the volume to zero instantly. Ed: I'll bump it a star, for two reasons. First, the original unit I bought is still alive, and in the headphone amplifier world, that seems to be a real accomplishment. And, I bought another one for my 2015 Vizio, now relegated to the bedroom, and it fired up and worked as well, on optical. So now I have two of them, and I'll see how long they last. Maybe someday down the road this will get the final star. Also wik: Two months now, one is on 24/7, the other with the second TV off and on. No problems. That should be long enough for any glitches to show up. Update: Over two years now, it's on all the time, and it still works.

### ⭐⭐⭐⭐ Great value for money
*by A***M on December 15, 2020*

My unit had an audible hissing sound (white noise) that was more pronounced on the left channel than on the right. The hiss was always there when the unit is connected, regardless of chosen input, or if it is usb powered from the PC or directly from a power socket. After contacting Fosi support I was assured these units do have white noise and that it may be more pronounced in certain headphones. I later changed from my low impedance headphones (32 Ohm HyperX Alpha's) to a medium impedance headphone (150 Ohm Sennheiser 58x Jubilee's), and on the higher impedance phones the hissing is barely noticable - so much better performance there. Pros: 1. Good sound quality, clear and loud, especially for the price. 2. Much smaller and lighter then I expected it to be. I can take this in my backpack with my laptop to have good quality sound on-the-go. 3. Physical bass and treble eq that works very well. 4. High quality materials, especially the knobs (!) - bass and treble knobs have tactile "clicking" when turned, the volume knob has a smooth turn operation. All knobs are from metal, heavy, and feel very high quality. I greatly appreciate this. 5. Lots of connectivity options - IN usb / opt / coa, OUT front 3.5mm headphone jack or back RCA. 6. True plug&play - Easiest setup I had. Cons: 1. White noise. Especially noticeable in low impedance headphones. 2. Left and right channels differ slightly (white noise at very different levels between them), so it may not be very balanced. 3. Cannot compete with DAC/AMPs above the 100$ range in sound quality (is that even a con...?)

## Frequently Bought Together

- Fosi Audio Q4 Desktop DAC Headphone Amp for PC Mini Stereo Headphone Amplifier Combo USB Optical Coaxial to RCA AUX Digital-to-Analog Audio Converter Adapter for Home Powered Speakers
- Sennheiser HD 560 S Over-The-Ear Audiophile Headphones - Neutral Frequency Response, E.A.R. Technology for Wide Sound Field, Open-Back Earcups, Detachable Cable, (Black) (HD 560S)

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*Product available on Desertcart France*
*Store origin: FR*
*Last updated: 2026-04-22*