I appreciate long term listening may be required to hear subtle differences but I was expecting noticeable tonal changes between regions. Somebody mentioned the CN region was plus 8db at 8khz! I can hear plus 0.5db changes in the equaliser so how can I miss that? I’m not saying it doesn’t exist but I can’t hear it. I admit I’ve probably got expectation bias of not hearing the changes but my ears are never wrong either and I can’t hear any difference. Maybe my Walkman is ignoring the region change despite indicating it’s set.
Whether you hear a change or not is not a big deal, and nothing to worry about. The next question is what, and how you are listening. The changes being discussed are small changes, in the details, and not a major tonal change.
If listening in general, and not focusing on a particular detail of the sound, then you may not notice anything
If listening to analyze particular details, then you may notice the change. i.e. listen to familiar tracks, for specific details
- bass - impact, detail. Is there more or less sub bass. Are the bass notes a "thump", or there is detail, and you can feel that it is a bass kick drum note. An example is listening to a Bose system with resonant bass, where there is a lot of volume, but no details. The energy is attractive, but there are no details, and it can be overpowering, and not musical. Then listen to a more "normal" audio system, and hear more realistic bass notes, faster, more clearly defined, detailed. Impact/speed that you can feel. Enjoyable in a different way.
- vocals - the inflection of the voice, is it detailed, or details are blurred/non-existent? Hear the vocal shifts, where the voice is like a musical instrument? Does the voice pull you in, or leave you with a feeling of it being background / "elevator" music.
- background/single instrument tones, piano, guitar, etc. Are they richer, with more harmonics, and even simple notes can communicate musicality, or blurred together, buried in the background, and un-interesting. I find this the hardest area to quantify. But on some systems, I find simple notes so rich that it makes the song, and on others, they don't do very much at all. Just background notes that I barely notice.
- stage - does the stage seem more solid, background noises in a live recording seem real, and 3-dimensional. Can it create a space, or is everything merged together.
All the above have a close relationship to micro details/micro dynamics. If these are depressed, or blurred, or non-existent, then the above characteristics are lessened, or disappear altogether. Also, the system, and synergy, is a giant component. As are the individual ears/brain doing the interpretation.
In the end, though, this hobby has to do with whether you are enjoying the music that your system creates. If you are enjoying it, then nothing more needs to be said.
And the standard caveat, that this is just a personal, and subjective viewpoint.