Hi Paula,
I am an M3 owner for a little under a month, but have not listened to any of the other speakers you mention. I also don't listen to too much classical music, but thought that maybe something here may help out.
Up until two days ago, I had no subwoofer and was impressed with the low range extension of these relatively small speakers. If I had no option to get a sub, I would have been satisfied with the way the M3's performed with the genres of music I listen to regularly (Jazz, Hawaiian, R&B, Classic Hip-Hop, Heavy Metal).
In room response goes down to 40hz for me. Good enough to get a decent sense of the bass in a jazz band if that is analogous to anything in classical music.
