probably a stupid question

[blackvetterzo6]

With my baffles open on start up, i get this vibration on my right side door or rear pillar. Only coming out of first. It's really annoying with the radio off.I've tried pressing on ever piece of the right side but cant quite find it yet. Left side is as solid as a rock, not a sound. Anyone have this annoying noise, or give me a guess on where it might be coming from.There's no way i'm bringing it in the dealer for this, but i'm just curious.
Thanks guys.

[blackvetterzo6]

I found the rattle in the back passanger speaker.Could something of come lose inside or do you think it's the grill? How hard to get at it? I cant really tell ,but by tapping on the speaker the annoying rattle happens. I know nothing about bose speakers.
Thanks guys. I will look for some threads on getting to the speakers.