A virbrating sound coming from the right rear. Any ideas? Normally i hear it when the bass hits a
 

bit on the stereo, but at certain RPM ocassionally it will rattle. Im not sure what it is but it sounds like it might be coming from the right rear door-ish area. Help....

B

Speakers vibrate when they make noise.
 

I have the same exact issue. Had it for quite some time now. I've just been too lazy to open it up and dynamat the speakers. I just turn down the volume so I don't hear it so much... but my friends complain about it when they're in the back seat.

im getting it with the engine too, at certain RPM's the frequency must be just right and i get a
 

rattling sound