Tigerfootball

I have this ANNOYING rattle coming from the rght rear deck, around the speaker. I have looked around here and found that there are several others with my problem. they say they went to the dealer and it was fixed, but the rattles came back. would something like dynamat or just some foam padding work? or is it a problem with the clamps holding the panels down?

If there is a thread pertaining to this directly about how someone has fixed it, feel free to point me in the right direction. Thanks a lot.