The active crossover of M9 can be adjusted to plus and minus a few dB's. The owner originally played it on 0dB, ie flat, the bass was too thin for his room. Later he set it at +2dB. The bass was very smooth and linear. I have requested it to be set to +4dB, there were more bass and the sound was warmer.Very interesting! Not many have heard both...and even fewer have heard them in the same room and perhaps in the same system!
Did you find the much bigger Magico M9 had more powerful bass and greater sense of all out scale and higher 'limits' due to its size, larger cone/air displacement, etc? Or did you feel that in the areas of pure power and scale, they seemed comparable, just different?
It is up to the user to dial in the amount of bass he/she prefers. Even if one turns up the bass, the presentation is different from that of XVX. XVX has more mid bass, more slam, perhaps helps by the tuned port. M9 has more low bass and it will not give you the kick at the bottom as some prefers with Wilson Audio speakers.
There is certainly more details in M9. It gives me the impression of it being more refined, better for classical. XVX maybe better for Michael Jackson, pop music.