Thanks Alan and BBIBH for some very useful information. Although the room we're in is huge, the group occupies only a portion of the room, so I don't have to fill the whole room with loud music. Nevertheless, such an open space robs us of much of our music. It is very nice to know that it is the amp that is giving up and not the speakers. I'll try moving to the NAD C370 with double the rated power.
I have tried using a fairly large subwoofer and I frankly didn't hear enough of a difference to make it worthwhile. Is it possible that there just isn't much musical information in the acoustic jazz I play that is below the M22s range? If that's true, then wouldn't another set of M22s (and another amp) be a better solution than a subwoofer? With proper placement, it seems that music would have to travel less distance to get to everyone from 4 speakers instead of 2, so that we could actually run at lower volumes. And it would probably improve the off-axis performance too, right?
Roger
