i have a 97 civic and just put a system in it. at first i was all good, but the power wire was sticking out and i thought it was gonnna touch with the ground wire so i screwed the wire in a little more. i turn on the system and now it makes a weird noise. when there's no music playing the sub just bumps, like boom boom boom boom, even though theres nothing playing. can some one help me out. thanx