---
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: "S$137"
currency: SGD
in_stock: true
reviews_count: 8
category: "Fosi Audio"
url: https://www.desertcart.sg/products/146629540-fosi-audio-q4-dac-headphone-amp-for-pc-desktop-digital
store_origin: SG
region: Singapore
---

# 24-bit/192kHz HD audio support 16Ω-200Ω headphone drive USB/Optical/Coaxial multi-inputs 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:** S$137
**Availability:** ✅ In Stock

## Summary

> 🎶 Elevate your audio 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?** S$137 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/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

- • **Compact Powerhouse:** Sleek full-metal design fits anywhere while delivering low-jitter, high-res audio up to 24-bit/192kHz.
- • **HiFi Plug-and-Play:** Instantly elevate your sound with zero driver hassle—just connect and immerse yourself in crystal-clear audio.
- • **Ready Out of the Box:** Comes with all essential cables for a hassle-free setup—start enjoying premium sound the moment it arrives.
- • **Tailored Sound Control:** Fine-tune your bass and treble with premium metal knobs for a personalized listening experience that stands out.
- • **Versatile Connectivity:** Seamlessly switch between PC, TV, and stereo with USB, Optical, and Coaxial inputs for ultimate audio freedom.

## Overview

The Fosi Audio Q4 is a compact, entry-level DAC and headphone amplifier designed for professionals seeking high-resolution 24-bit/192kHz audio. It supports multiple digital inputs (USB, Optical, Coaxial) and outputs (3.5mm headphone, RCA), drives headphones from 16Ω to 200Ω, and features adjustable bass and treble controls with premium metal knobs. Its plug-and-play design requires no drivers, making it perfect for seamless integration with PCs, TVs, and home stereo systems.

## 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: Sounds great, affordable, and high quality to dollar ratio - Great budget DAC+amp combo. Super simple to set up for a PC, and great quality feel. It is hefty for its size, and the knobs feel really premium. Good level of volume, bass, and treble adjustments too. Definitely would recommend if you are looking to get a better audio setup for under $100. It is roughly 4x4 and about 2 inches tall so it should fit basically anywhere. No mounting brackets or hardware included, but you could easily make something work if you wanted to mount this on a desk.
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.)

## 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

### ⭐⭐⭐⭐⭐ Sounds great, affordable, and high quality to dollar ratio
*by M***K on December 14, 2025*

Great budget DAC+amp combo. Super simple to set up for a PC, and great quality feel. It is hefty for its size, and the knobs feel really premium. Good level of volume, bass, and treble adjustments too. Definitely would recommend if you are looking to get a better audio setup for under $100. It is roughly 4x4 and about 2 inches tall so it should fit basically anywhere. No mounting brackets or hardware included, but you could easily make something work if you wanted to mount this on a desk.

### ⭐⭐⭐⭐⭐ 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 Singapore*
*Store origin: SG*
*Last updated: 2026-02-27*