1: How do I power the DAC-Q4?

• You will need to use the supplied Micro-USB cable to power it; we recommend using the PC-USB port/5V power adapter.

Note: The Micro-USB cable cannot be fully inserted into the device power port; please do not force it. Subsequent revisions have been made.

2: Why are all my wires plugged in, but the Q4 RCA analog output is silent?

• At this point, you should check to see if the headphone output is plugged into the headphone. If so, you should unplug the headset to simulate RCA output.

3: Why do I get endless white noise?

• Please check that your input device uses Dolby/DTS audio; please switch off Dolby/DTS audio and try again.

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

• Please switch the USB port to USB 3.0 or back USB port and try again, as some USB ports have unstable data transmission;
• Please try again with another computer;
• Please replace the PC-USB cable and retest, and contact us for compensation if the original cable is faulty;
• Please change the power supply adaptation and retest; why? Because of the aging of the power supply, there may be an abnormal power supply resulting in white noise. We recommend using the PC-USB port/5V power adapter to power it.

5: Is a USB Device not recognized on Windows?

• Select Start, then type device manager in the Search box, and then select Device Manager;
• Expand Universal Serial Bus controllers. Press and hold (or right-click) a device and select Uninstall. Repeat for each device;
• Once complete, restart your computer. Your USB controllers will automatically install.

If a Windows update causes the device to be unrecognized, please update all windows components, reboot, and retest. Please contact me for a solution.

6: How to do a 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 Q4” (Digital HiFi Audio).

7: 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 sound card device, open Spotify and play, confirm that it works, and then switch the playback device to DAC-Q4 “Digital HiFi Audio.”

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

• Right-click the PC sound icon in the lower right corner, open Volume Mixer, click on the icon of the device/SPDIF: “Digital HiFi Audio” to open the Properties, click the Advanced, and select 24Bit, 96000Hz for maximum sound quality output.

9: Why do I get an intermittent sound?

• Please switch the USB port to USB 3.0 or back USB port and try again, as some USB ports have unstable data transmission;
• Please replace the PC-USB cable and retest; contact me for compensation if the original cable is faulty.

10: Why is there no sound when PC-USB connects to the PC?

• First, press the PC-USB operation to confirm whether the digital playback output has been selected. If there is still no sound, you can restart the computer and repeat the process; please make sure you have chosen the correct device name on your PC sound setting.
• Some computers’ USB ports are low quality on the front panel; please change the USB port to have a try; it’s better to use the USB port on the computer’s back panel.

11: Why is my device stopping working after a short time of use?

• Ensure your audio source and the headphones, amplifier, or powered speakers you connected are working well. And please check all the connections of the input and output cables; please change the audio source, output devices, and cables to try again. Also, please check the power supply works or not.