Alright guys... a couple weeks ago I got some Alpine 6.5's and 6x9's. I have them wired up to two seperate amps and they worked fine, until today. Now I have this annoying whine in the rears only and when my engine revs up the whine increases also. When the headlights are on the noise is really bad but when off it's hardly noticable. Also when my head unit is turned off there is no whine at all. HELP!!!! this noise is driving me insane