BMiller wrote: Then, if I could just fix that darn ground loop noise.

I had an "alternator whine" or ground loop noise for the last year. Got so fed up that I brought it to an install shop to try and get them to fix it once and for all. Finally, we figured out that I my Alpine 4 channel amp had one flaky channel! Scrapped the whole amp and went with a JL Audio 300/4 amp...

MUCH BETTER! Man, that was driving me absolutely batty!

- Jon