my car is a 95 z28 camaro with the optional factory amp on teh speakers. as soon as i changed the factory deck i got feedback when its at low volume, not engine feedback but more like when ypu crank ur speakers when the deck isnt paying music ie mute. what can i do to eliminate the problem. i changed my deck 3 times now, always to a better one but still no luck.
Factory amps generally have no external gain control, if any. I would guess that the issue here is that the increase in output voltage from the HU is not sitting well with the factory amp and it is letting you know this.