Originally Posted by
luke81
Sounds like you might have an internal issue in the HU or amplifier. You mentioned that the problem started when you swapped door speakers. In theory the speakers should have nothing to do with the whine, but if somewhere in the process of swapping them the highs amp was shorted it could have caused internal damage to the amplifier. Those older Kicker amps were nice amps, but they had rather ineffective protection circuitry.
The kicker amp does have a blown channel but i didnt know until i put it in and hooked it up so i bridged the connections that is the only thing i know about the amp im considering looking for a new one.
I'll do some more trouble shooting tomorrow and possibly looking for a new highs amp.