@arthur1260
Evolution taught our brain what's relevant and what not. We moved to a new apartment, near train tracks, first few days/weeks were a bit unusual but we got used to it, now we can sleep through the night, though the trains are still going on time.
I can easily imagine that originally our ears (and maybe bodies) are capable of picking up a much wider frequency spectrum than the current science considers de facto, but due to our planet getting noisier our brains just filter things out in the conscious domain (as proven by scientists). It could be that our brains go into a different state (alpha or theta) while listening to music, it widens the acceptance of frequencies which enables our brain to sense or perceive something different. And that could be the point where traditional science fails to answer, especially if it starts with the well-known and accepted theorem that humans' audible spectrum is 20hz to 20khz.
Traffic noise perception is a good analogy! The adaptation of hearing is used in subjective tests, when it is necessary to separate changes in the frequency response (FR) from more subtle moments. For example, when we evaluate the sound of two different speakers, we are faced with a difference in the FR and coloration at the same time, but by default we attribute everything to the FR. The adaptation of hearing helps to separate these two sensations - for some reason, a person clearly feels changes in FR only for a short period of time after their occurrence, and all this time the attention is involuntarily focused on the FR, and the rest of the moments remain in the background unnoticed. After some time (for everyone in different ways), the perception adjusts to the new conditions and you stop feeling the tonal imbalance at all, from this moment the consciousness begins to confidently fix all the other aspects of the music. It's like walking into a dark room from bright light and having to wait for the eye to adjust to the dark.
The point here is that wires and other anomalies cannot be evaluated in quick tests. A quick test aims to detect small changes in the FR and distortion factor as accurately as possible, and this is where its advantages end. Long tests (a few minutes and more) evaluate everything else, revealing those little subjective things that turn sounds into music.