A follow-up!
So waaaay back before we got to the Bose debate and all these graphs, I had this problem with my Bose 901's and came here looking for advice. Here's what I did:
Ordered the CLOTH surround kit from Simply Speakers (~$60 on eBay).
WHOLE NEW SOUND! Not only is the rattle gone, but the sound overall is so much richer and fuller than before.
