1 Please plug the power cord into the amplifier then the wall to avoid
sparkers. (The sparker is caused by wrong use way)
2 Please plug the audio cables into the amplifier then switch on to avoid
the humming and noise.
3 Bluetooth connection has priority than RCA input. After Bluetooth is
connected, the RCA input won't work. If your device has no sound with
RCA input. please check if the Bluetooth was connected.
4 The Bluetooth input and RCA input of the Fosi Audio BT30C 2.1 channel
Bluetooth amplifier cannot be used at the same time.
5 Please turn the VOL knob to the minimum before power on to avoid
instant loud noise
6 For more troubleshooting, please read the User Guide and contact us.