Investigate 2L recordings ... If there is no ultrasound in them it’s not because they did not try
did sound like a good idea. Unfortunately their demo-recordings page looks like
this.
Found a download of a so called 192kHz demo disc of theirs. Admitedly of
very questionable provenience!
About half of their 'highres' recordings looks like below. Super trusty highres that is
Most of the others are cut somewhere between 30-50kHz. Look like 96kHz recordings at best.
But a few look ~legit 192kHz. A Haydn Quartet below.
The spectrogram still seems quite strange, e.g. why are there 'empty' bands at ~70/50/40 kHz?! And the whole 40-80kHz band is quite empty/quiet and then the 80-90kHz band has approx the same sound energy as 30-40kHz. May be the dubious source, may be my software (sox), may be...
Anyway the answer for you should be quite clear: yes there is quite a bit of sound above 20kHz .. even in such a fairly dubious recording.
P.S.
and btw, cymbals are suposed to have the highest high-freq energy and there is none in this recording. This is just a small string quartet and it still goes to 90+kHz. A full grand orchestra should have a lot more high-freq energy. If someone can provide such a recording I'll do the spectrogram.