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As a few of you know I've been in the market for an amp for my new L7. Since I've been working on a few other projects on my system I figured it was about time to get rid of the ground loop isolators and fix the root of the alternator whine. I've spent countless hours researching on various forums so I thought I'd share what actually worked for me.

1. Sanded down the contact for the head unit ground. (it was already on bare metal but i figured what the hay)

2. Adjusted the angles of my two amp grounds.

Let me explain the 2nd because it made a bigger difference. I've got two amps grounded to a single point on the riser behind the rear seats. I tried sanding that down to bare metal a few months ago but that didn't work. This time I played around with how the two wires sat in relation to each other. I noticed that as I moved them around the whine would change. If they ran parallel to eachother the whine got worse. So what finally did the trick was putting them at 90 degree angles... and viola, no more buzz, whine or ground loop isolators and to top it off my head lights don't dim as much when the bass hits and my system is quite a bit louder now. Hope this helps some of the others who've had problems w/ ground loops.

 
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good tips. bad grounding is a reason for whine. when i had it, it was due to cheap RCA plugs, JL audio if i remember correctly. i bought some street wires zero noise RCA's and that killed it completly. they are the best plugs that money can buy IMO. i suggest giving them a try if the grounding point isnt your problem.

 
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OK, you gona hate me! Electronics is what I do. All you actually did was to get a proper ground from both wires,simple as that!
WHY does everybody have to complicate things?