I think the reason why nobody has bothered with digital amps in context of power amps is because you can only 2/3rds of of the power from a digital amp..

look at sony's spec sheet as an example, they report 110-130 watt on some of their digital hybrid amp sections..

in reality a 130w system 105-110w is the effective output, try and use the rated spec power and watch a fried circuit board in your near future..

a 110w system will have the effective output of 85-90watt range try and use the rated wattage output and watch the circuit board fail...

that is the price of a digital amp hybrid..

I doubt a full digital power amp could push the same power output that the traditional power amps we use today do.

I would expect a 20-35% power reduction on a digital amp.. in regards to the rated output of the suggested maximum output of the power amp in question can produce.. if you follow sony's example for the last 25 years..

a pure digital or a hybrid digital amp is a lost cause to produce..