K5 Pro ​

Gaming DAC & Headphone Amplifier​

- Born for Gaming. Perfect for your home gaming system.
- Suitable for PS5/Computers/PC/MAC/Nintendo Switch/active speakers, etc. 
- Adopts the Texas Instruments NE5532 op-amp chip
- Converts USB Type C/Optical/Coaxial signals to 3.5MM AUX and RCA signals
- Master volume/bass/treble control and input mode switch

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Your computer, phone, tablet, TV and more can benefit from the K5 Pro 24-bit DAC and headphone amplifier, which is perfect for upgrading the audio between your computer and gaming system.

the upgraded version of Fosi Audio Q4

Fosi Audio USB DAC Headphone Amp Combo

Input: USB-C/OPT/COA/3.5MM Microphone; Output: RCA/3.5mm Headphone

USB C/OPT/COASampling Rate: up to 24bit/96 kHz;

Output power: 1000mw@16Ω, 500mw@32Ω, 300mw@64Ω,   150mw@128Ω, 80mw@300Ω;

THD: <0.003%; S/N: >110db; Frequency response: 20Hz-20kHz

Recommended headphone impedance: 16-300Ω


Perfect for providing high quality audio to speakers or headphones, the K5 Pro is a premium 24-bit DAC and headphone amplifier for your computer, phone, tablet, TV and more, The K5 Pro connects to your computer’s USB port or optical output without any software to download, making the K5 Pro quick and easy to set up, and will have you playing in seconds.

An elegant and rich sound​


The K5 Pro breathes new life to your games – even the ones you thought you knew best – by delivering more detail and immersion than ever before.

Outstanding performance​


Cross-platform compatibility allows you to enjoy enhanced audio on your favorite games, regardless of whether you play on a PS5, PS4, Xbox One, Nintendo Switch, or PC.


PC, Mac, PS5, PS4, PS4 Pro,Nintendo Switch, Phone


Input Type

USB-C, Optical, Coaxial, 3.5 mm mic


Output Type

3.5 mm headphone jack/line-out, RCA


USB Sampling Rate

Up to 24 bit/96 kHz


Optical/Coaxial Sampling Rate

Up to 24 bit/192 kHz


Headphone Impedance 

16-300 Ω  


Power Input

DC 5V via USB-C  






≥ 110dB  



4.4x3.7x1.2 in (112x95x30mm)  


Net Weight

0.55 lb (251g)  

Frequently asked questions

Have questions? We’re hereto help

1: No sound from the microphone.

  • Please make sure all cables are well connected.
  • Please make sure your headphone has a PC default path: Setting-Microphone-Allow accessing to your microphone.
  • Please make sure the Record on your PC sound settings is set to "Fosi Audio K5 Pro". PC default path: Sound settings-Record Choose "Fosi Audio K5 Pro".
  • Please make sure the K5 Pro is in USB input In optical and coaxial input mode, the K5 PRO DOES NOT support microphone.
  • Please make sure the microphone permission is enabled on the audio source device.

2: Why it can not be turned on when connecting to PS5?

  • The USB cable included in the package has two Please use Type-C to Type-C form to connect K5 Pro to your PS5's Type-C port on the front panel. K5 Pro cannot be powered on if you use the Type-A to Type-C form to connect.

3: Wow! So now I can connect to pretty much any TVs and many gaming consoles, as well as PC and MAC?

  • Yes.Other devices with Type-C port like mobile phones, tablets, iPad Pro, etc. are also supported. Fosi Audio K5 Pro is super-versatile.

4: How do I power on the K5 Pro Mini stereo DAC?

  • Besides the USB Type-C Cable included in the package, you'll also need a SV power adapter with USB output, such as your cell phone's charger or power bank, or just connect to your PC via the USB Type-C Note: When you plug the USB Type-C Cable into the K5 PRO and long press the multi-function knob, if you see the Input Mode Indicator is on, that means the connection is up.

5: Why do I get endless white noise?

  • Please check if the input mode selection is correct.
  • The K5 PRO supports 3.Smm headphone output and RCA sound output simultaneously. You can check if the headphone output is normal or not when you find the RCA output has no sound.
  • Please try to replace the RCA cable and test again.
  • Please check that if your input device is playing Dolby/DTS audio or not, If yes, please change it to RAW/PCM type and try again.

6: Does K5 Pro support Microsoft Xbox?

  • It doesn't support the latest Xbox Series X or Series S since they do not support the UAC 1.0 or UAC 0 protocol. For Xbox One X, Xbox One Sand Xbox One, you can connect the console to K5 Pro via the optical, which only supports audio output but microphone not supported.

7: No Dolby/DTS audio and I still get noise through the USB input?

  • Please try to connect the USB Type-C cable to the other USB ports on your Some USB ports may have unstable data transmission so please try to swap it.
  • Please try it on another computer.
  • Please replace the USB Type-C cable and retest.

8: The K5 PRO is not recognized on Windows?

  • Click Start menu, then type device manager in the Search box and then select Device Manager.
  • Expand Universal Serial Bus Press and hold (or right-click) a device and select Uninstall. Repeat for each device.
  • Once completed, restart your computer. Your USB controllers will automatically install.
  • If Windows update causes the device to be unrecognized, please update all windows components and reboot and Please contact us if the problem still insists.

9: How to do plug-and-play on Windows?

  • Just click the sound icon in your notification area.
  • Click the "Select playback device" option.
  • Select the playback device "Fosi Audio K5 Pro".

10: I can't play Spotify music in Plug-and-Play­ mode?

  • Please exit the Spotify app and switch the playback device to the computer's own sound card device, open Spotify and play, confirm that it works, and then switch the playback device to "Fosi Audio K5 Pro".

11: How do I get the highest 24Bit/96kHz resolution on my PC?

  • Right-click the PC sound icon in the right bottom notification area, open Volume Mixer, click the icon of the device/SPDIF: "Fosi Audio K5 Pro" to open the Properties, click the Advanced, select 24Bit/96kHz for maximum sound quality output.

12: Why do I get an intermittent sound via the USB connection?

  • Please try to connect the USB Type-C cable to the other USB ports on your Some USB ports may have unstable data transmission. Normally speaking, it's better to use the USB port on the rear panel of the computer console.
  • Please replace the USB Type-C cable and Contact us if the problem still insists.

13: Why the sound cuts in or out?

  • Try to reduce the sound of your device.
  • Try to exchange your audio source and cables to test, if still so then there may be some problem with the K5 Pro.

14: Why does my device stop working after a short time of use?

  • Make sure your audio source devices and the headphones, amplifier, or active speakers you connect are working well. And please check over all the connections of the input and output cables. Then you can try to change the audio input source, output devices, and cables to test again. Also please check if the power supply works.


Comparison Chart


User Instructions