Amp Problems
2nd lower the gains on the amp till the whining/pitch goes down/away.
3rd get better RCA's.
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The ground I used for my amps is one of the screws/bolts that holds down the 'C A M A R O' bezel in the rear. I sanded the area down good, sandwiched the round lug terminal between two washers.
No alternator whine or ignition noise here at all (of course, power wires and rca's are run on separate sides of the car too).

