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I had done Bavsound stage 1 and the underseat woofers in my f10 with the HK audio. I was really happy with the sound in there. Recently I traded my car for a 6 gran coupe with B&O audio. The sound was good, but the bass was muddy, and not as punchy or tight as my f10 was. Last week I changed out the woofers in my 6, and holy cow- what a difference. The B&O amp must send more power to the underseat woofers than the HK does. The bass is tight and clean. The vibes felt in the seat at higher volumes are awesome.
I would highly recommend this upgrade to anyone with B&O audio looking for better sound.
I'm impressed by the Bavsound guys. Great products, great support.