ive had a d3 installed in my envoy for over a year now. im having trouble with my gmos-04. it has a gain control on it, and when i turn the gain up, i get great sound, but the awful alternator whine. and the ground is not the problem, ive tried grounding to every different location on the vehicle with the car running and stereo playing with no luck. ive also tried grounding the rcas on the back of the headunit. when i turn the gain control down, i have great sound with no whine, but if i turn up the volume the front speakers cut out then the back ones cut out, back and forth and so on. wonderi