That would be an interesting comparison. Your mains aren't very far apart but my guess is that you would still get better results with a horizontal VP180 as opposed to two horizontal M22's. The number (2) and layout (centred) of the mid drivers and tweeters on the VP180 should help "separate" them from your mains somewhat. I'm not sure why you'd want to rotate the VP180 into a vertical position though since I thought you already had a vertical M80 for a centre.
My mains are about 10-11 feet apart the closer distance mentioned above was in my apartment. Also the issue wasn’t just separation from the mains but width of the center channel image. I agree that the VP180 driver layout should tighten up that image as compared to dual horizontal M22s.
The reason for considering a rotating VP180 would be to have it vertical for most music giving IMO a more precise soundstage for music, and horizontal for most movies giving more of a “wall-of-sound-effect. Another possibility I’ve considered would be to try a vertical M80 below the screen like I have now with a horizontal VP180 above with the option of turning the VP180 off for most music listening. Though this arrangement would create the hassle of also needing to change the center channel volume for level matching when switching between one and two centers. Though it would give the advantage during movies of better centering the center channel image vertically on the screen.
Not a high priority for me just something I’m considering if the VP180 gets good reviews that don’t indicate any horizontal dispersion issues which I often found with the VP150.
