Okay, i have a Alpine 7893 with MB quart coaxils in the back, and Jl TR coaxils in the front. Whenever i play a cd, the speakers make static sounds, like a radio station that doesnt come in. The cd's arent scratched or dirty, cuz brand new cds that play fine in my friends cars, dont in mine. What could be wrong with it? by the way, all four speakers are making this noise and they sound fine when listening to the ready, bad only with a cd. thanks