there is nothing wrong with trying to succeed with the proper files, the proper headphone, and taking all the time needed to train and get used to whatever it is that can be heard. maybe that will end up working great, maybe not. as an experiment I see no problem with this. now as a representation of reality, of course it's total nonsense. what matters to me as an individual is to know if while I'm on a train or walking on the street with my IEMs that rolls off after 12khz, I would ever notice that the music is "wrong" because it's 320kbps mp3? and I believe I've answered that question for myself years ago. when at home on the computer, with a relatively silent room and speakers giving me more trebles than I can hear, I fail my ABX tests. so while walking on the street it would be real misplaced pride to pretend like 320mp3 ruined my sound. now at home again(just when I thought I was out, they pull me back in), I tend to listen to flac, because storage is not an issue so why not? but TBH I often don't pay attention and end up playing mp3 too. never killed me. IMO increasing sound quality comes from kicking the butt of whoever ordered the sound engineers to mess up records for the sake of being loud. or from finding the signature that is neutral to us, or getting rid of channel imbalance and audible hiss. not so much from worrying about what happens 60 or 70db below the loudest sound of a song. or that one instrument I don't have in 99.9% of my music that's apparently messed up in mp3 at a frequency I can't hear anymore. mp3 and AAC are practical codecs, and for all intended (space saving) uses, they do a fine job IMO.