- Make sure the wiring is correct.
- Connect the same subwoofer to the speaker output to check if it plays sound, adjust the frequency knob and turn the volume up full.
- Try another input mode.
- Try the different audio source, subwoofer and cables.
- Download some Subwoofer test music in the range of 20 - 100 Hz.
If you have any questions or concerns, please don't hesitate to contact support@fosiaudio.com.
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