So I installed my amp today got power running to it and everything. When I turned the ignition, expecting to hear music, I instead got no music and a loud buzzing sound. I messed around a little bit and now I am getting a patting sound, almost like a helicopter. I had this problem when I would unplug the speaker pre-outs and the subs would make the same sound. Do I have to have all pre-outs used or what? Doesnt make any sense to me.