'ey PirateKing & lojikop... .thanks for the info. I presently have all my components using just one ground point (ground power block, which is connected back to the battery ground through firewall). I have only one ground point -- so it *shouldn't* be a ground loop matter. But one thing I didn't do is ground to the case of my opus but rather the ground wire from inside the opus. Perhaps I should switch.
I also have my carpc on the drivers-side rear seat and all power, rca's, monitor cables, etc.. all run down the drivers side -- so this might be my problem.
Will have to give it a lil more thought... thanks for the suggestions.