Applied foam rubber tape to the door button housings to stop bass rattle.
There is a TSB on this, I saw later, but I am using a much thicker foam
rubber, and it worked like a charm!

 

I didn't need to do the switch housing, but I did the same thing on the covers behind the door handle and armrest it makes a difference.If your having rattles this works great. Somewhat off topic when I got my car the doors rattled like crazy, so I took the door panels off and they were full off loose change, another thing to think about if you have rattling subwoofers.

 

I've done the same to my sub surround, and the small panels behind the door pull and door handle.