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Iain123 · 10-03-2021, 11:14 AM

The standard HK system is pretty poor. Best bet is to just replace the rear sub:

https://bmwi.bimmerpost.com/forums/s....php?t=1304784

10-03-2021, 11:14 AM	#2
Iain123 Private 15 Rep 76 Posts Drives: I8 Join Date: Jun 2018 Location: Edinburgh, UK iTrader: (0)	The standard HK system is pretty poor. Best bet is to just replace the rear sub: https://bmwi.bimmerpost.com/forums/s....php?t=1304784
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