I have a stereo source, a stereo amp (input and output), but only 1 speaker (building a boombox).
Amp (RCA input) below:
Amp (stereo output):
I want to combine L+R (input OR output) to a single channel. I tried connecting both -VEs and/or both +VEs together but it didn't sound great. In fact, people online are saying it could be damaging stuff, and that you'd need a resistor or two.
What's my best option? I plan to run 3.5mm AUX, radio/bluetooth audio through it. Thanks!