It almost sounds like you're living with absolute certainty that we know norhing. That none of the 100+ years of research in psychoacoustics taught us anything at all about human aural perception. “Let us assume that you can't hear 20khz or above?” It’s not an assumption. Literally millions of human beings have been tested for their frequency range. It’s almost like saying “let’s assume gravity is a real thing.” Do you really think wave interference patterns that affect the sound in the audible range are a mystery that none of us ever knew about and are mysterious and unmeasurable? If ultra frequency sounds manifest a wave within the audible range we hear it, if it isn’t masked, and we can measure it. AND any basic cable will transmit it without any audible distortion.
going back to the early days of Bell Labs about 100 years ago to current times there has been a massive amount of research on what we hear and don’t hear. We know for example that the total distortion in a basic audio cable is so low that it’s hard to say for sure if what is being measured is actual distortion or just thermal noise. It’s around -140 db. We also know that no human being can come close to hearing any noise or distortion at -140 db. And there is no recording or source component either digital or analog that can produce a signal that doesn’t add at least 20-30 db of noise and distortion. Analog sources in particular aren’t anywhere near that. And we have numerous controlled tests that clearly demonstrate this inaudibility.
We also know, based on a large body of research that humans can not accurately compare an aural memory to real time sound. Not even close. And we know through other studies that it is a cause for humans, all humans, to misidentify differences in sound where none exist.
“There are indeed all kinds of PhDs working 16 hour days doing research. What is really dumb is to think that they continually miss real audible phenomena that is only detected by audiophiles under non controlled conditions.
Did you know that for GPS to even work they have to use algorithms to make real time adjustments for time dilation due to special relativity? The sati lights are literally experiencing time at a different rate of Han we do on the ground because of the speed of their orbit Do you have any idea the level of sophistication and degree of precision that requires? Do you think the same scientific research and engineering that allows for that is missing something in cable transfer function that only audiophiles are detecting?