Nut, a few comments on your replies. Yes, it was understood that you were speaking of the usual situations where the power capabilities of your receiver wouldn't be exceeded. In those situations more than a mere "consensus" is involved; there's no factual basis(shown in properly controlled double blind tests)for claims that separate amplifiers would be audibly different. The fairly widespread audio mythology to the contrary is simply that: a mythology.
Although volume leveling processing can be useful at times(e.g., late at night or suddenly loud commercials), even a sophisticated application such as Audyssey's Dynamic Volume shouldn't be used as standard practice, since some dynamics are lost. I always use Audyssey Dynamic EQ, but rarely have the need for Dynamic Volume.
As to the dual center speaker arrangement described by Gieseman(Mike Drew has a similar one), it may have some benefits, but the single M22 should be tried first. In this connection a recent
post by Ian is of interest. Although the point under investigation there in the double blind testing was the fear that comb filtering was very harmful when more than one speaker was playing the same sound, the results are clearly applicable to two center speakers which of course are playing the same center channel sound.
