I have a big problem , I've gone around the whole trunk looking for a ground to stop the engine noice. The bass has a popping sound none stop its a constant thump thump thump even when the radio volume is at 0. The voice speakers have a rpm whine. the higher it goes the higher the whine. I have the 4 gauge power cable ran through the right side and the rca, remote ran through the left side under the side steps right under the carpet there. I tried getting a capacitor to see if that would help the ground but i dont know what else to do. I'm this close to changing the radio.. can some one please help!!