Clavil, the monster amp is called 925. I still do not know too much about it. . . a 4-chassis design, operating in class A/B, probably with a switch mode power supply and PFC rectification, probable power rating between 500W and 550W per channel. Price between $45K and $50K.
There is also a new 625 stereo amp: once again, my information is incomplete and not definite: single chassis, 330 to 350 Watts per channel, SMPS + PFC. Listed between $12000 and $13000.
I'll add more info as I learn it. G.