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It would make sense. The woofers do what the amp tells them, the amp does what the head unit tells it. This is assuming there's not some other unit in the chain between them.
Someone w/ more knowledge about BMW systems should chime in, please don't buy parts based on my thoughts. I've been doing 12V automtive electronics for... oh 30 years now, but the way our systems are so integrated and my lack of experience with your particular version (i.e. is it analog, digital, the "MOST" system, etc.) I could be easily missing something.
And there's a chance it's actually a woofer, an electrical issue of some sort, could it overextend the travel and busted a foam surround or spider or something else like that?
In the "old days" we start swapping cables, speakers, etc. and see what if the issue swaps or stays in the same place. Not sure how easily done that is for your car.
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