Unless you have started construction, I would first order the W22s and trial them. You may be dissapointed going from the M80s to the 22s in that large of a space.
I can't comment on it furthur as my room is only 16x14x8.
Alan Lofft would be a good guy to PM or to email and get his advice, here is some advice he gave me on a similar question:
"Alan, in my 14 x 16 x 8 room, will I notice a difference between a pair of M22s and an EP500 sub and a pair of M60s and the EP500 sub in my room size?" -Robb
"Hi Robb,
As to the comparison you cited: you might notice a little more upper bass "warmth" with the M60s and the EP500 vs. the M22s and EP500, simply because the M60s have two woofers that aren't far from the floor and you'll benefit from some upper bass enhancement, even if you set the M60s to Small with the EP500. Other than that, they are extremely close to the M22s, as are the M80s, so much so that in many comparisons I forget which combo I'm listening to. I have to look at my A/B switcher to remind me. These comments assume I'm listening in 5.1 with the EP500 always on. If I switch to stereo only, with the EP500 running, the differences are a bit more detectable but still subtle.
One advantage that I like about using the M22s over the much larger M60s or M80s is that because the M22s front baffle and overall dimensions are smaller, the M22 soundstage seems to have just a bit greater spaciousness and depth. It's quite subtle but it's there, and I believe it's simply because the overall dispersion of the M22s may be a little better." -Alan
