I agree. I believe he is assuming that this genre of amps has not improved any in the last 20 years.
It has.......I wouldn't waste my time with them if they hadn't.
As for "conversion".........some types do. The PCM/PWM ones do. Mostly, they just modulate the power supply, which is all that any amp does to begin with. It is just a different form of modulation.
I do not understand how they "only transmit white noise". Waiting for an explanation on that one. RFI, yes they do produce that. Some of us go to great lengths to eliminate it.
As for "cheap". Yes, some are. About the only real cost eliminated is the heat sink. You can get by with a smaller power transformer, as you don't have to heat the atmosphere at idle. Other than that, they are not that much cheaper to build.
Well, the goods ones aren't........
