Community I need some help please. So I took out the stock Symphony II out of my motor and installed a Kenwood DDX-4028BT Head Unit. Everything else work just fine except there is this annoying "thumping" sound through the speakers when powering on/off. Anybody here who has had similar problem and how they overcame it. I did not have to cut wires as I used the proper indicated harness for these motors. And by the way this aftermarket Kenwood stereo is miles better than the Symphony II. The sound quality is excellent.