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
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AI Verdict
This is a simple, no-fuss audio upgrade for your PC or TV setup that adds noticeable clarity and the fun of physical bass and treble knobs.
For its entry-level price, the Q4 is a strong fit for anyone wanting a tangible audio improvement over their computer's built-in headphone jack. Its combination of versatile inputs (USB, Optical, Coaxial) and the rare inclusion of physical bass/treble knobs makes it a flexible and user-friendly first step into better desktop audio.
If you need to power more demanding headphones (250Ω and up), look for a DAC/amp with a higher power output, often specified in milliwatts (mW) into a certain impedance.
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Pros
- Physical bass and treble knobs allow for easy, on-the-fly sound tuning.
- Plug-and-play on PC/Mac with no drivers needed for instant setup.
- Versatile inputs including USB, Optical, and Coaxial fit most desktop and TV setups.
- Drives a wide range of headphones from 16Ω to 200Ω.
- Solid-feeling full metal shell provides durability.
- Includes optical and USB cables right in the box.
Cons
- The blue power indicator LED is extremely bright and distracting in dark rooms.
- No physical power button; the unit turns off by turning the volume knob all the way down until it clicks.
- Bass and treble knobs lack a center detent, making it hard to find a neutral/flat setting.
- Some users report channel imbalance or scratchiness at very low volume levels.
- Uses a dated PC-USB Type-B port instead of the more common USB-C.
Dimension Scores
Provides a clear improvement over most motherboard audio, though some audiophiles find the mids recessed.
The physical bass and treble knobs offer a significant range of adjustment, which is a standout feature at this price.
Having USB, Optical, and Coaxial inputs is excellent for an entry-level device, covering PC, TV, and other sources.
The full metal shell feels sturdy and durable, but it requires USB power and isn't designed for portable use.
Best For
- Upgrading from motherboard audio for PC gaming and music listening.
- Improving TV audio for use with wired headphones via the optical input.
- A first-time desktop audio setup for powering headphones and active speakers.
- Users who want simple, physical controls for bass and treble without software EQs.
Not Recommended For
- Driving high-impedance audiophile headphones that require more power (above 200Ω).
- Gamers who need a microphone input for their headset.
- Users seeking a portable, battery-powered device for on-the-go use.
Watch Out For
- The blue power LED is so bright that many users resort to covering it with electrical tape.
- There is no dedicated power switch; it's always on unless you turn the volume knob all the way down or unplug the USB power.
- Some Windows updates have caused driver conflicts, requiring users to roll back the update to restore audio.
- With very sensitive IEMs or headphones, a slight background hiss or noise floor may be audible.
Full Specifications
| ASIN | B07VDQQY95 |
| Brand | Fosi Audio |
| Language | English |
| Material | Metal |
| Item Weight | 15.2 ounces |
| Manufacturer | Fosi Audio |
| Mounting Type | Tabletop Mount |
| Interface Type | Coaxial, Optical, USB |
| Number of Pins | 11 |
| Item model number | Q4 |
| Number of Channels | 1 |
| Product Dimensions | 3.9"L x 2.9"W |
| Maximum Supply Voltage | 5 Volts (DC) |
| Minimum Supply Voltage | 5 Volts (DC) |
What Buyers Say
The most surprising thing about the Q4 is how much fun the bass and treble knobs are; they're the main reason to pick this over other budget DACs. It's a clear step-up from your computer's built-in audio, making things sound fuller and more detailed. Setup is dead simple—just plug it in and it works. The biggest annoyance is the piercingly bright blue power LED that you'll almost certainly want to cover with a piece of tape. While it won't satisfy high-end audiophiles, it's a fantastic and affordable starting point.
“for the price this thing is a no brainer, it makes my headphones sound way better than my pc's headphone jack and i can crank the bass for games, just had to put tape over the crazy bright blue light lol.”
Common Praise
- A noticeable upgrade in sound clarity and power compared to onboard PC audio.
- The bass and treble knobs are effective and make it easy to tweak the sound for music, movies, or games.
- Plug-and-play functionality works flawlessly with Windows and Mac without needing drivers.
- The all-metal case feels surprisingly premium and sturdy for the price.
- Great value, providing multiple inputs and a headphone amp for a low price.
Common Complaints
- The blue power LED is blindingly bright.
- The volume knob can feel scratchy or cause channel imbalance at the lowest settings.
- No center-detent on the EQ knobs makes it hard to know when they are set to neutral.
- Lack of a dedicated power button is inconvenient.
- Some users experience driver issues or the device failing after a Windows update.
- Sound can be 'thin' or 'tinny' for more critical listeners, especially compared to more expensive DACs.
Ownership Tips
- After a few weeks, you'll have a piece of electrical tape permanently living over the blue power LED.
- You find yourself using the bass and treble knobs more than you expected, especially when switching between music and YouTube videos.
- The lack of a power button means you either leave it on 24/7 or get used to the click-off on the volume knob.
- You might notice some USB-powered noise or 'squelch' with highly sensitive headphones, prompting a search for a cleaner power source.
Frequently Asked Questions
Do I need to install any drivers to use this with my computer?
No, the Fosi Audio Q4 is a true plug-and-play device on Windows, Mac, and Linux systems and does not require any driver installation.
Can I use this with a PS4 or PS5?
Yes, you can connect it to a PS4 or PS5 using the included optical cable for audio output to your headphones or speakers.
Does this have a microphone input for my gaming headset?
No, the Q4 does not have a microphone input. It is a DAC and amplifier for audio output only.
Why is there no sound when I plug in my headphones?
Plugging in headphones automatically mutes the RCA output. If you're not getting sound from the headphones, ensure you've selected the correct input (USB/OPT/COA) and turned the volume knob up.
What do I do if my TV is connected via optical but I only hear noise?
You need to set your TV's digital audio output format to PCM. The Q4 does not support Dolby or DTS audio formats.
Can the Q4 power high-impedance headphones like the Beyerdynamic DT 990 Pro 250 ohm?
While the Q4 is rated for headphones up to 200Ω, it will struggle to properly power 250Ω headphones to their full potential. It's better suited for lower impedance models.
Is the USB cable for power and audio?
The device comes with two USB cables. One is a PC-USB Type-B cable for connecting to your computer for audio data, and the other is a micro-USB cable for power, which can be plugged into a USB port or a separate 5V adapter.
Buying Guide
A DAC/Amp like the Fosi Q4 takes the digital audio from your computer or TV, bypasses the cheap, noisy components inside, and gives your headphones a clean, powerful signal. You don't need to be an audiophile to hear the difference; it'll make your audio sound clearer and less 'flat'. The main reason to get this specific model is if you love the idea of twisting a real knob to add more bass for a movie or turn up the treble for a podcast.
DAC (Digital-to-Analog Converter)
Your phone and computer already have a DAC, but it's usually a low-quality afterthought. An external DAC like the Q4 is a specialist, designed to do one job well: converting the 1s and 0s of your music file into a clean audio signal for your ears.
Inputs (USB/Optical/Coaxial)
This determines what you can plug into it. USB is for your computer. Optical is perfect for getting audio from your TV or game console. Having all three makes the Q4 really versatile for a desktop setup.
Headphone Impedance (Ω/Ohms)
Think of impedance as how much resistance your headphones put up. The Q4 can easily power most common headphones (16-200Ω). If you have specialty high-impedance headphones (250Ω+), you'll need a more powerful, and usually more expensive, amplifier.
Alternatives
If this isn't quite right, look for a 'headphone amp with a dedicated power supply' to reduce potential USB noise. If you have very hard-to-drive headphones, search for an amp with a higher 'milliwatt (mW) output at 300 ohms' to ensure you have enough power.
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