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There was a link in one of the many threads regarding the Harman Kardon system that had the folks from Harman Kardon actually explaining how they develop specific systems for each vehicle. Although a lot of what they had to say was of little interest to me, the one statement that really struck me was when it was mentioned that BMW imposes strict guidelines for the total weight of the system. Really? How do you design proper speakers when you are limited to how much they weigh? As soon as I heard that comment, everything made sense to me as to how a renowned Manufacturer could come up with such a weak product. A well regarded aftermarket mobile stereo equipment installer told me that the best way to really improve the X3 is to add a dedicated 10” subwoofer and amplifier in the luggage compartment. Not exactly cheap at around $750 installed, but in line with the cost of premium sound systems from other luxury Manufacturers.
Short of shelling out that kind of money, I absolutely agree that the first thing to do is to disable the synthesized engine sounds from the cabin. I personally think that all of the other suggestions made by the OP are more subjective in nature.
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