My stand is about 60-70% open at the back, it's one of those tiered glass (3 panes) type stands, supported at the front corners and in the middle of the back, so I wouldn't be concerned about the porting. The 22s have such great reviews and are often said to sound, dare I say "M80ish", that it sounds as if they would blend extremely well with M80s up front. This is just something I wanted to put out there, to you guys that might have tried it, whether successfully or not and compare the two. Obviously the VP150/M22/M80 are all well timbre matched, as they use the same drivers and twtrs, so the differences are probably subtle anyway.
