As someone who has the B&W system, I think a much more realistic and cost effective option would be adding a sub to the HK system. It'll give you a lot of the low end that's missing and make the system sound fuller. I'd argue that unless you're a serious audiophile you're apt to get similar gains going that route. The B&W does mids and highs really well, but it's still lacking on the low end.
A quality sub can go a long way. My personal reccomendation would be the Audison APBX 10 AS2, which is a powered and compact unit that can fit in the spare tire well.
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2019 X7 xDrive40i
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