If you chose the M Audio Enhanced bass option in 2001, the tweeter area on the door, to the right of the air vents is empty. Just a grill with nothing behind it. On my 2000 it WAS occupied and if you did not get the M Audio in 2001--same deal.
The difference between my '00 and '01 with M Audio is dramatic. It is certainly the best stock BMW audio system ever.
MJ
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