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..

 

[keesijp68]

Very nice forum, I am just be member, I am kees and do electronics already for years make a lot of amps, most analog
and hybrid/circlotron.

Sinds not that long with class D and get quite nice results already after first learn about control theory, and no it is not simple.

Saw here a post who use square signals, I do also, and use most 10 Khz to get control system optimal, also for analog I use this to opimize feedback
and sound colour/quality. the fast respons is harder tightner audio, softer resonse is more relaxed, no need to get higher slew rate then music instruments do, we need to
use the fastest musical instrument like wood sticks do to well, faster is not needed. Best is a little bump not a peak, round itf off so we get a very small ringing, max two cycles.

I stil are in ltspice sims, and busy with a 2 mhz 5 level system. and learning, I need some kind of hobby.