1. Why does the sound only come from the phone when using it as the audio source in USB mode, despite all devices being correctly connected?
Please verify if the data transfer function on your phone is activated. Some phones automatically facilitate data transfer, while others require manual activation of this feature.
2. Why is there no sound during playback despite all connections being correct?
A. Please rotate the power switch/volume knob to check if the device is turned off or if the volume is too low.
B. Verify the input mode indicator to ensure the correct input mode is selected.
C. Check if the audio source device is not playing or is on mute.
3. What is the purpose of the PRE OUT interface on the Fosi Audio MC351?
It is designed to expand your audio system, allowing connections to an active subwoofer, active speakers, or an additional amplifier. It's important to note that the volume output from this interface can be adjusted via the volume knob, but it is not affected by the treble and bass settings.
4. Why do interruptions occur in the sound during Bluetooth mode?
A. Please check and ensure there are no other interfering signals or electronic devices nearby;
B. Try moving the amplifier closer to the Bluetooth source device to enhance signal reception;
C. Remove and then securely reinstall the Bluetooth antenna, or try testing with a different antenna;
D. Test with another Bluetooth device to see if the issue persists;
E. Verify that the amplifier is set to the correct input and output modes; try switching modes to troubleshoot the problem.
5. How to change the sampling rate in USB mode?
To change the USB sampling rate on your computer, please follow these steps:
A. Open the Control Panel and go to Sound settings.
B. In Sound settings, locate and right-click on the Fosi Audio device, then select "Properties."
C. Navigate to the "Advanced" tab, where you can adjust the sampling rate to your desired setting.
If you have any further questions, please contact our support team at support@fosiaudio.com.
