@markwd, I have seen some research work on people being able to detect sounds outside of the typical 20kHz window, though it seems largely irrelevant to music reproduction, so while there might be yet-to-be-understood science out there, the default intellectually honest posture is wait-and-see while instead focusing on what we know impacts audio reproduction.
Your statement in italics hardly suggests you are scientific in your approach to a topic. Show us your research into and the proof of your conclusion. The ability for a system to produce a response way higher than 20kHz is highly relevant. It is why supertweeters with output up to 90kHZ brings so much to the party. Although a sine wave above 20kHz can not be heard by the human ear it forms part of the sound wave. The high harmonics complete the waveform rendering the resultant sound more lifelike. Go do research you may be able to learn something and consider using your ears sometime. The science is understood just not by you.
Flashing your credentials is totally underwhelming and it appears that your vast knowledge has not endowed you with an open and reasoning stance. Remember there was a time not too long ago that scientists proved conclusively that a bumblebee could not fly which of course was later debunked.
