I have B&O in my F10 M5 and HK in F15 X5. The sound quality and the power of the B&O is obviously better, but I have couple annoyances about the B&O. Center speaker rattles and lower front speakers have a zipping sound with certain tones. I have not had any annoyances with HK yet, but like I said the sound quality is not all there.
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Current: 21 M5 Comp, 17 X5M, 06 M3, 14 Ferrari FF, Tesla Model S Performance.
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