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I have the same bass-rattle issue in the driver's door; seems to be around the the door lock post. Started happening a few months ago. Mine is the (non ML) standard stereo system. I don't play my music loud, nor have the bass cranked up. Very annoying...
So I finally had mine fixed, dealership said it was a "deformed left front door interior handle with frame", they replaced it and it's perfect now. Evidently more than a few have had the same issue so I'm told by dealer..