dznutz
I agree that someone should have his expectations in check to a degree.The size of the sound and the bass that comes out of the Perspectives is really surprising. However, yes, we are talking about fairly small drivers (though long excursion, and low distortion).
Not sure what you mean by "compromises the midrange" the louder you play them. One of the features of the Perspectives is that they remain clear, clean and grain-free even at loud volumes. That's what I hear, and John Atkinson made a point about that also in his review.
However, I'd say there does seem to be a bit of a limitation in terms of going super loud, where it seems like you turn up the volume but they hit a point where they don't seem to be going much louder. But, for me, that only just barely begins to happen when I'm cranking them to listen from another room down the hall in my house. They go louder without strain than I need when in my listening room.
But, yes, if you play really loud you might want a larger speaker, or one with more/larger drivers (well designed of course).