Class D high frequency problems.

[Sokel]

I don't think it's that different, It seems like mostly a display thing. Showing 160 dB of dynamic range isn't exactly ideal. Here are the two roughly overlayed:

View attachment 429302
It's by no means perfect, but is gives enough of an impression.

We can't narrow it I think.
Say someone is listening to old rock,or Classical:

Old rock popular example:

Space Oddity-David Bowie.

Lots of energy there and lets not forget that the energy we see across the spectrum is additive,is not like measuring a single sine for example.

(there's classical example,Vivaldi at the left too but I'll stop here,there's all kinds of stuff out there)

 

[mixsit]

..There’s a current thread elsewhere devoted to a similar, mostly subjective argument that current Class D amps feature some inherent flaw that makes music unpleasantly “synthetic” and not suited to true hi-fi sound.

Why might the sound quality from Class D amplifiers sound somewhat synthetic?

I've heard some Class D amplifiers from time to time over the past several years. My latest experience was listening to a new amplifier designed around...

forums.stevehoffman.tv

...

I tag along for general audio interests these days. But yeah thank you. This does take it in another direction doesn't it? :>)
It goes one better too ('though? :>) 11..
Ted Torres Jr. (First three paragraphs or so..