Class "D" amp? I do not have a clue. Do you?

Mapman - you're right about low input impedance. My Rowland has extra board (with THAT1200 intrumentation amp) to increase impedance to 40k.

Channel Islands D-200 user here. They sound just as good as my previous amp, run WAY cooler and weigh a lot less. My previous amp was a Pass Labs X250.5

Kij,
I gave up listening to sine waves sometime soon after I survived the '70s.
Zobel limit on long term power is therefore pretty much a non-starter.

One other MINOR issue, I don't think yet mentioned, of 'd' /ICE is that the frequency response changes as a function of speaker impedance. Lower impedance starts rolloff earlier. The ASP1000 module is worst in this respect being what....about 1/2 db down at 20khz w/4 ohm load?
Give up, at least for now, the idea of flat, wide band response out to X-ray.

I have been an audiophile for over 30 years and after owning tube amps from Conrad Johnson, to Michaelson Austin TV10,VTL,Grant Lumley,AtmaSphere OTL and SET from Cary and a host of good solid state amps, I now enjoy the Red Dragon Leviathan mono blocks-which if you haven't a clue about class D then you wouldn't know anything about my amps either.

All I can report is that I find much to admire about them, little to fault, and that they have been on 24/7 for over a year and no problems.

If they have a "sound" it is something of a cross between a good tube amp and a good solid state amp.
They are smooth, detailed,non fatiguing and have as much power as you are ever likely to need.

They sounded great on Merlin TSMMX,high eff. Tanoy Arden(dc)and on Ref 3a Grand Veena.
They emit no hiss, hum, or any snap crackle or pop.

Noises that most of my tube and solid state amps had.

Th

I leave my Class Ds on 24X7 also with little concern, except if I am away for more than a day or so I will turn them off.