True North, here is a post from someone who can compare the MM27s to a monitor with a sub. Perhaps you could PM them and ask them specific questions?
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From: Gravity8058
I understand your concerns. We received our MM27s a month ago. We all gathered around and cranked them up. With a MASTERED rock cd, at a loud volume, they sounded bright. However, as we started working with them in normal situations (normal volumes), we realized that what they are giving us is just the TRUTH. Seriously, these things are indispensible. I mixed a dense rock track the other day with a lot of tracks, that was recorded all digitally. Even with our 192/ Rosetta 800 convertors (w/ Big Ben clock) we still have had difficulty with buildup in that 2-8k region when mixing songs with a lot of tracks.
That was with our Ns-10, Genelec 1031a/ 1094 sub setup. NOW, with the Barefoots we hear it all so clearly that we make better mix decisions and turn out better mixes -- hands down. These dont hype anything -- they do make obvious the recent trend on harsh sounding rock records. I spend half of my time mastering (in our other room with B&Ws etc...) and I can say that the mixes done on the Barefoots are really EASY to master.
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Tetness