Have you tried the upgrade midrange/tweeter speakers from BSW? Go to their web site Bavarian Sound Werks, they got a kit where you yank the OEM speakers and put new tweeters & midranges speakers, don't have to touch the subwoofer on the HiFi (base) system. The instructions are quite comprehensive, and you don't loose any of the feature of GPS integrated audio system. I was thrilled to hear the "new rich sound" coming out. It took me no more than three hours to do the four speakers for my e93 w/nav.
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