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In order to fix the issue you may have more effectively, here are some tips:
–About Bluetooth connectivity issue:
1. Ensure that all wiring is correct.
2. There is no signal interference nearby.
3. Try using a different power source and outlet.
4. If there are multiple input modes, check whether other input modes work properly.
5. Try using different Bluetooth devices, speaker wires, and speakers.
6. Change the environment.
7. If there is a Bluetooth antenna included, ensure that it is connected correctly and try using a different antenna.
–About sound issue or not working properly:
1. Make sure all the cables are fully connected.
2. Adjust the treble and bass control of the power amplifier to achieve the right tone.
3. Please try to change the sound source and cables to test.