[evono]

A while ago I posted about the annoying whine coming from my head-unit. People seemed to think it was a ground loop and after some reasearch im pretty sure thats the problem.
However, I can't get it to go away!
I figured my head-unit had a blown a resister internally (someone mentioned pioneer head units like to do that) so I went ahead a bought the new Pioneer DEH-p4800MP. Wire this baby up and the hum is still there.

Im currently running a single 2006 kicker 750.1 amp. I wired the headunit and sub in myself. Ran the power wires along the left side of the cab and the signal and RCA cables along the right (I heard running them together could cause some noise). Granted I don't have great RCA cables but this is some serious noise to just be minor interfierace.

I can't figure this out anyone have an idea for ways I could either test to make sure it's a ground loop, fix the loop, anything? I want to stick some tweeters in but with this whine its going to sound awful. Thanks in advance