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I was very dissapointed in all the electrical noise I had in the car. Even with the car off, I was hearing popping and clicking. Start the car and add alternator noise!
The head unit was an JVC unit. My son has a JVC head unit in his BMW so we swapped them, knowing wiring would be the same and my HU was silent in his car and his popped and whined in mine.
I tried everything I could think of including running the speaker level outputs from the HU to the amp (as is done with the Becker 220). No change.
I ran dedicated temporary power and ground from the HU to the battery without improvement.
Tried two different ground loop isolators. No joy. Finally connected HU speaker outputs directly to dash speakers and there was no noise.
I run my dash speakers (Polk 4") as fronts and the door "woofers" as rears. Using the fader just a bit I'm satisified with the sound. I'll wire in the back speakers at some point but they contribute so little that I'm really not missing them at all.
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