Amazing (to me) digital amplifier

Did we evr discussed here this issue ?

I saw such an amplifier in Jerusalem, didn't listen to it - but was amazed by the way it woks:
It recievs a digital signal in the input, processes the signal to the output .
The output stage controlls the ELECTRICITY OF THE WALL to pulse the speakers as required.

An intresting idea.

(BTW - all around the new nice stories, nothing was at the level of Naim !!!).

Arye