I'm quite happy with the HK system in the M2, when I'm actually listening to it instead of listening to the N55 sing. And I consider myself someone who has put a fair amount of time and energy into learning about audio systems, both 2-channel and home theater; my current dedicated 2-channel listening room is based around Audio Research amplification running Wilson Benesch composite and carbon fiber-cabinet stand mount speakers. I'm sure the B&W Diamond system in the M5 sounds better, but my car didn't cost $125K.
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