How confident are you about the 75% estimate?
@richardbrand granted, it’s unscientific; but if anything I’m pretty sure it errs on the conservative / generous side.
I do believe that when a significant number of people report audible differences, there is probably an explanation in physics, either already known or waiting to be discovered.
The explanation is usually in behavioral psychology rather than futuristic physics. Occam’s Razor.
This might explain why the stridency with which implausible sonic improvement claims are shouted seems proportional to the crappiness of the audio system being owned by the person making the claim.

