guys i need help !!. i have this annoy noise coming from all speakers, specially when the head lights and the a\c (heater) are on you can hear the tranny shifting sounds like a whizzed ,almoust at the same volume of the music. if i press mute i can still hear it. im guessing its a ground some where. i have a kenwood exelon1200 watss and a coustic crossover, both in the rear of the car , hatch. thanks guys .