Jason;
This sounds a lot like the problem I had with my install.

I moved the ground leads all over the car and could not get rid of all the noise. This was with an Alpine 4 channel amp. I finnaly gave up on the Alpine and went with a Kenwood that had floating ground inputs which got rid of all my noise.

You might want to see if the A/D/S line has a unit with floating grounds or move to a brand that does.

Kamau Wanguhu
[email protected]
http://www.BORGcube.com
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Kamau Wanguhu [email protected] http://www.BORGcube.com