Adrian, I think Randy is pointing out that the M22's are ported and designed to be played vertically. Of course, only he can answer to that.
Also, the ports may cause some issues if placed in an enclosed shelf unit like the vp100 or vp150 are designed for. The cabinet design of the M22 is not quite the same as the center channels which allow for two different angles if I see the websites pic and details correctly. I have been looking in to a center channel myself and have been using one of my M3's in a vertical position above my tv and so far have some mixed emotions on it. Probably an M2 or an M22 might better match my M80's. Won't know unless I try it or someone tells me different.
I know another M80 would be the ticket but that ain't gonna happen in my current living room setup. Not sure if I would need two of any of the three though. Meaning the M2's, M3's or M22's. Just my two and a half cents worth.
