I have always heard that M3s > M22s when there is no sub. I didn't know because I always had a sub. I got my parents M3s because they didn't want a sub. When I moved into an apartment where I didn't feel comfortable using a sub I starting using my M22s by themselves. In my opinion, with no sub, M22 > M3s. M3s have that bass hump and mids I dont like. M22s have sufficient musical bass and a great neutral sound. I really like them without a sub.

Denon 3808, M22s, M2s, VP100, Hsu sub