I felt something was lacking with just the M22's also, but to me, it was more of a lack of sound stage. The sound was localized. Then I tried the on-wall M22's and it greatly enhanced the sound stage, but I didn't like the sound. At first I thought there was a lack of bass, but after much listening, there seemed to be more bass. I don't like voices from the on-walls, they just don't sound right at all, and some frequencies seem shrill.
My next trial will be with mounting the M22's on the wall and then mount M2's just above them. I'm not sure what affect this will have, if any, but I'm expecting the same M22 sound with perhaps a bigger sound stage since sound will be coming from above also.
Anyway, just my experience with M22's.
