Interesting. There have been suggestions elsewhere that Naim tends to accentuate the upper bass, which I have assumed to be to emphasise the rhythmic part of the music and a characteristic of the “Naim sound”, This finding would seem to be consistent with that. Preference would depend whether you like your sound natural or inducing foot tapping - some people equate foot tapping with the music conveying emotion, though that is only the emotion induced by the beat, not the full emotional content of the music as written/played (depending of course on the music). To other people naturally reproduced music sounds better, while for some music deeper bass may be a significant part of conveying feeling, even though that might not be part of the beat.