Well, since I happen to have a V4B, two 210AVs and a 212AV outside in the band room at the moment I just popped out and did a very quick five minute side by side comparison. Of course, Tom is right (is he ever wrong?

). To my ears the 212AV sounded tighter and the two 210AVs were louder in a "room filling" kind of way, if you get my drift. But to be honest, I don't think the difference in volume was sufficient to make me choose one over the other on volume alone - if I was in a situation where one 212AV did not suffice I think I would be reaching for more than a pair of 210AVs to make the difference.