There's a couple of threads about this, but none of them had conclusive advice on how to fix the vibration. Service bulletins are hard to obtain without paying for them. My car is only in powertrain warranty mode, so taking it to the dealership may cost me.
Basically, when music with moderate bass is played, the passenger front speakers vibrate. It sounds like either the tweeter near the door handle or the midrange/woofer in the door. Very nasty sounding.
What causes this and what is the fix, with possible references to the technical service bulletin? Thanks!