Proof by contradiction: if there's no threshold, then sound fidelity can in theory be infinitely precise. But nature does not work that way - at Planck length distance breaks down, at the width of a carbon atom the resolution of a vinyl surface ends, etc.
I used to have this exact problem with my cables! For this reason, I've spent the last six months building quantum shielding for audio cables, with genre-specific time crystal coatings. It is now available in my Qtsy store, if anybody is interested!
I'm not an audiophile, actually. There's no point, IMHO the most limited component of the system (with the highest actual threshold) would be my ears, and I know why: lots of exposure to loud music of various kinds over several decades.
Proof by contradiction: if there's no threshold, then sound fidelity can in theory be infinitely precise. But nature does not work that way - at Planck length distance breaks down, at the width of a carbon atom the resolution of a vinyl surface ends, etc.