To connect the Bluetooth (BT) module with the DVD amplifier, connect the BT audio output (usually mono) to the amplifier’s audio input. If the DVD’s native audio is also going to the amplifier, it is highly recommended to use a DPDT switch. The switch not only lets you seamlessly choose between BT audio and DVD audio, but it also prevents the BT module or the amplifier from possible damage that can occur if both audio sources are connected at the same time.
🔹 DPDT Switch Wiring (for Audio Selection)
Inputs (Side A):
Connect BT module audio output (L or R + GND) to one side of the switch.
Connect DVD audio output (L or R + GND) to the other side of the switch.
Outputs (Center):
Connect the center pins of the DPDT switch to the Amplifier audio input (L or R + GND).
🔹 Working:
When you flip the DPDT switch one way → BT audio goes to the amplifier.
When you flip it the other way → DVD audio goes to the amplifier.
This prevents both signals from mixing, avoiding distortion or damage to BT module/amplifier
Note: if you want to select L R and Ground to the amplifier you can use single stst in L, and ground for single output to amplifier.