Hi Don! Glad to hear you're enjoying the M22s.
I went from Cambridge Soundworks Ensemble 1s to M50s (and later to M80s), but I'm afraid my impressions of the CSWs weren't quite so good as yours. The M50s were an amazing leap over the CSWs (and the M80s were an amazing leap over the M80s).
I'm interested by your M2 review; they're the only speakers of the current Axiom lineup I haven't heard. I'm sorry to hear that they don't hold up as well at low volumes, but my towers seem to do quite well.
I too was amazed by the soundstage of the M22s when I first heard them. They're really outstanding speakers. Congrats!
