Which Class D Amplifier? PS Audio, Ghent, Nord, Merrill or other???

The need for higher switching frequencies in class D amps is usually based on the theory that current frequencies are too low and cause sound anomalies in the human audible range of 20- 20,000 Hz. Current class D switching frequencies are typically in the 400-600 KHz range with theory proponents claiming switching frequencies above about 1.5 MHz are required to ensure there are no sonic anomalies in the audible range.

However, this theory has never been scientifically proven and there’s virtually no evidence to support it. Several class D amp designers. including the highly respected inventor of Hypex NCore Bruno Putzeys, have publicly stated there’s no need for increasing the switching frequencies above current levels.

The human ear is capable of decoding intermixed harmonics and timing cues into the 200khz plus ---with zero jitter. Micro and macro signals intermixed. With two ears doing this as a combined spaced pair, with the micro and macro intermixed temporal cues.

So 1.5mhz, with zero distortion in all parameters might finally be good enough. Who knows. Except the amps, as good as they might be, very likely won’t make that spec.

Hearing has just about nothing to do with 20khz sine waves.
consider not looking at engineering specs .. and start looking at the literal library of research of the human ear.

After all... its about the ear, not the amplifier alone with just engineering weighting and engineering measurement considerations.

:)

Eric, I’d love to pull all the lore out of my pocket and then, as I give to to all, it turns into money in their pockets (for builders and buyers), and better hifi for all as a final outcomes.

As that is how this works, the reality we are dealing with ..when it comes to talking on forums.

Since I worked hard, very hard, over decades, pretty well 7 days a week...in order to know this stuff inside out.... I’m reasonably reluctant to just give that away.

I need to be able to put food on the table in order to have the hard work be of use to me personally.

So, I’ll do the thing where I will make the self aware and willing to work at it, make them aware of the problem’s realities, aware of the fallacies of their argument..and then they can work it out for themselves. Which is all an intelligent thinking person actually needs--if not knowing where the mistake was made, but just to know the mistake exists, at all. That's more than enough.

If I was purely business minded and had zero empathy for my fellow man, I’d keep my damned mouth shut and let ignorance flounder, for as long as humanly possible.

Some of us say as much as we can in that spirit, but we still get beaten up by the remorselessly ignorant, no matter what good we try to do.