04 LS430 Rear Deck Subwoofer Question
 

I have a 04 LS430 with ML Sound System and Nav

Sound like the speaker is rattling rather then producing bass.

How do I know if its blown or can there be something else making that sound?

Do a search on the forum. There are plenty of threads that address all the questions in your post. The info is very detailed (saved me a bunch...).