lolz......should of known to search here first.....after having my Pioneer DEH-P5000UB installed and pushing hard for 6 months, the amp and subs grounded out after being bumped by one of my labs last week. afterwards, no matter where or how I grounded the amps/sub/headunit; I was receiving horrible ground loop whining & popping. The entire time I was thinking I had fubarred my amps.

After re-wiring the system twice, buying new wire/connectors/etc., I was about to give up. I had done many searches without results, but the first time I included Pioneer and ground loop brought up that RCA to H/U grounding method. Wish I would of saw this before hand, could of saved me $40. I was shocked when it worked.

To think I let IA talk me into purchasing a Pioneer. I should of stuck with JVC (which I know isn't top of the line either, but I've never had a problem with them).