I just put in a Eclipse AVN6610 double din unit, for some reason I have some feedback comming from the front speakers, and I checked the rca and wiggled them and it did nothing, i have aftermarket RF t1 power componets in there and rf punch 400x4 amp. I had a kenwood single din unit in there before and did not have the problem.

I have a double din kenwood in a while back and had the same problem I am having now and there is some antenna that was mounted to the side of my back window not sure if it was for the onstar or a extra antenna for a cellphone, well that got disconneted and it went away and still is to this day, not sure need help