Listening to equipment at home before you buy

After 45 years in the hobby I am not, nor have I ever been, an audiophile. So take what I have to say with a grain of salt.

I do not believe that an amp with a class D output stage is representative of the spectrum of solid state amps that are available. I would try again with a traditional power amp topology. This is not a put down of class D, just a suggestion to consider an alternative.

No, that is not correct, the ultrasonic spuriae in most amps with a class D output stage is not representative of class A, B, H, etc amps in any way shape or form. Here in the Stereophile bench tests of another PS Audio Stellar amplifier, you can clearly see that a low pass filter is used so as not to interfere with the test setup. The amp is compromised in its ability to pass a clean square wave without ringing:

https://www.stereophile.com/content/ps-audio-stellar-m700-monoblock-power-amplifier-measurements

Figure 3 also shows a 1K sine wave dirtied by ultrasonic noise. You just don’t see this stuff in traditional output stages. They measure it at .8 volts at the speaker terminals centered at 465k. Show me an amp with a class A/AB output stage with this kind of behavior.

Which is not to say that they are not excellent examples of this topology, or that there are not more important criteria than passing a square wave or the presence of ultrasonic noise.