[R-390] class-d

[John Wendler]

The real space for class-d is where high efficiency is important.

One such is portable applications where battery life and overall size
rule.

High power, where you don't want to pay for generating heat, may be another.

The R-390A is an 80 lb space heater... Regardless of which audio amp you
use.  If your desire is to experiment with class-d, then by all means go
for it - I don't think you will find cheaper.