Thanks for the 'insider's view', George. If the development of D-amps continues at the current pace, the 60 lb.blocks can finally stop heating listening rooms....Not to mention the spinal damage every time we have to move or clean them.
I want to see a GaN Class-d amp like Technics SE-R1 with it's 1.5mhz switching frequency for around $1500, it's not out of the question, just needs a different component change and little heatsinking.
Cheers George