Anybody have this problem before. I have a 94 z28 with the Bose stereo. A few months ago a high pitched sound started coming out of the radio, as the radio warmed up it went away. After a few months its now a loud almost booming sound (mostly from the back) and it doesnt go away.

Anybody have a clue on whether it could be the radio or the bose sub woofer?

Ideas on fixing it?

 

anybody have any ideas on this one?