2005 BMW 330 w/ stock Harmon Kardon audio.
Recently went on a road trip that included some not-so-good roads, which resulted in a lot of "shaking." Nothing that stood out at the time, but it may have added up...
Part way through the trip my audio started playing with what sounds like static. It's not loud, but it's there in most songs. Playing with the bass/treble didn't help. I tried isolating it to a particular speaker, but the noise seems to be coming from all of them (played with fader/balance).
Happens on all input sources - iPod, radio and aux.
I checked all connections behind the stock deck.
I checked all wiring to/for the iPod connection unit.
I checked all wiring coming out of the stock amp, including the ground.
Only thing I can think of is that the amp is dying... any other ideas? Any good shops around that I can take this to to diagnose the problem?