When i installed my second hifonics amp, i started picking up the alternator whine and some buzzing through the speakers. I bought a stinger ground loop isolator and plugged it in between my daisy chained amps, and the whine did not change. So, i grounded the tiny little red wires that were attached to the stinger. Not much improvement, but i could live with it. I decided yesterday to put in my Knukonceptz RCAs (lowest quality but double sheilded) to replace my "BOSS" ones. After this swap, the buzzing was back, but worse. I tried an old wire harness type noise filter that i had, and nothing changed. I tried grounding my rcas, still nothing. Ive noticed that if you wiggle the rca plugs at just the right angle, the buzzing goes away, but only if you hold the plug in that position. I really dont want to pour money into this problem, but do i need a new HU? Would the Knukonceptz Krystal Kables fix my problem? What can i do?!!!