I have a Pioneer AVIC Z110BT running through the stock amp and speakers, with a JL sub and dedicated amp. Have not had a problem since upgrading from the F90BT at Christmas, nor with the F90BT or the stock Bose/Symphony II before that.

A couple of days ago I started getting alternator whine and humming in the RF door speakers. Normally I would diagnose this as a ground issue and start chasing it down, however with the other speakers unaffected I'm a little baffled. I plan to pull and check the HU as soon as I get a chance, but in the meantime was wondering if any experts out there had suggestions on possible causes. Some thoughts/guesses:

- Broken/chaffed speaker wire
- Amp channel failing
- Defective RCA connection behind HU
- Other??

Thanks

 

Well, the good news is that pulling the HU was enough to stop the whine. Of course when the gremlins magically solve a problem they often bring it back later... will keep my fingers crossed :-)