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Where is the rattling sound coming from? Is it possibly one of the speaker grills? That stinks that the dealership won't replace the sub. I'd consider getting a second opinion from either another BMW dealer or BMW (don't know their contact info) themselves about this "unsolvable problem" that you were informed about. That way if you find out that your dealer is full of crap you can come back to him and make them replace the sub.
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