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      08-09-2012, 11:13 AM   #3
Z K
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Drives: E90 M3, MK6 GLI
Join Date: Jul 2011
Location: San Francisco

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The problem is not only what audio speakers are good.. it's what speakers fit in the stock locations. The mounting points for the BMW door speakers are very unique and most 4" speakers do not fit without an adapter. I don't know if anyone still makes these.