Originally Posted by tomlavelle at m5board.com
M audio either doesn't have speakers under the grills in the rear doors or they're inoperable. I'm not happy with the rear package shelf rattle on deep bass with my non-M audio setup (I have the power rear shade which I've read contributes to this rattle) so I'm looking forward to upgrading the rear subs and fixing this rattle.
I just upgraded my rear speakers. Replaced the stock crappy Nokia Speakers and replaced them with Boston Acoustics S55 and Polk Audio db1000 tweeters. An excellent upgrade. Part of the reason for the upgrade is to fix the darn rattle in the rear shelf.
Sorry I havent gotten around to making my post with pictures on how to remove and replace the rear speakers and fix the rattles but I hope to do that soon.
Here's a quick summary. Replace your rear speakers if they are stock. The difference is very noticeable as Nokia makes crappy speakers. The Boston Acoustics and Polk Tweeters costs $200.00 total and they sound much much better.
Rattles in the rear deck: and I have the electric rear sunshade. ALL the screws in the rear shelf were loose! (I have the M-Audio) The subwoofer screws are loose, the electric rear sunshade nuts were loose, and so as the other screws in the rear shelf.
So I removed all the screws and nuts, applied locktite to all the threads, reinstalled and retightened all screws, and voila! NO MORE RATTLES even in loud volume cranking up the subwoofers.
I will post pictures soon of my upgrade.