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I should probably have mentioned it's a car amp.. So it's probably DC? I'm also not sure about "feeding the same signal into all inputs". The signal (=voltage?) needed depends on overall design, chips used, I can't just select, say, 9 volts and use that? Yep, you are correct, it attaches to...

I don't have an oscilloscope, but I do have a multimeter. :)

I have a JBL amp which is working BUT there's something wrong with 2 of the outputs. Front left output just buzzes and front right produces no sound at all. I opened it yesterday and just from looking at the board I see nothing wrong with it so I'm not sure where to go from there. I'm also a...