I've heard a lot about Bavsound.
Try having someone code into the car the Bang and Olufsen sound profiles. This unlocks a very in depth equalizer and did the trick for me.
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02' 740iA 09' 750iA 15' 750iA
08' 328iA 09' 328i/6 13' 335i/6
08' MINI S/6 12' MINI JCW/6
04' LR-D2 12' LR-RRSC 16' LR-RRSC
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