I heard the Krell MR amps at a demo show at the local hifi shop. Dan D'Agastino was there, and I believe the big Krell subwoofer was also a part of that show. The system was playing in a massive room, and most of what I remember is just the SPLs, even in that big room....volume levels were ear splitting, and the sub was literally shaking the walls. Wilson speakers were a part of that demo as well, as I recall...X1s, Maxes or Watt Pupplies, don't remember exactly...and the MR amps were driving them beyond their limits. This was right before or during the launch of Krell's speaker line, and I think they were trying to make a point....
So its hard to comment on the sound of the MR amps from that demo, other than that they have some horse power...