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The upper freq. tend to go as do the lower when I speaker gets tired. If you can remove your door panel and remove the speakers and take a look they might be dry rotted. I know my tweeter and 4" were both bad in my M3. The 5 1/4 was still fin down in the kick panel, which is usually the case because it isn't exposed to the elements the others are in the doors.
I replaced mine but also added a aftermarket in dash CD player, 4 channel amp and JL Audio's 8" stealth boxes. I am a manager at a car audio shop where I live so I have to have good audio.
MB Quart makes a nice direct replacement and JL makes one that requires a little work.
Good luck...
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