Are you putting down my amps, like they are obsolete and that I might not should have made a recent purchase of them? 
I have had them for many years. Relatively new product at the time. Just in the middle of a major reconfig (digital mixer) and seeing if 3 amps on a 15A circuit is doable.
Back last century when class D was expensive "gee whiz" technology, it was mostly a premium expensive solution. Now that the technology has caught up and become cost effective it does IMO obsolete the old ways. From a purely engineering perspective a multiple tier class H or class G amplifier (similar but different) involves more complexity with additional points of failure than modern class D, so arguably more expensive to sell and less reliable.
That said do not throw away your amps, but if somebody offers you top dollar for them, don't chase them away.
Back when I was product manager over all Peavey power amps I did some bench comparisons between class D and multi-rail designs. And the efficiency benefits to class D was not a much as touted. The class D technology from decades ago had idle energy dissipation that diminished the efficiency benefit for modest power output.
Now I see cost effective class D being a win-win-win... simpler, cheaper, and more efficient. I am mainly angry that I didn't have today's class D technology to sell back last century.
JR
