Thank you usery for your link to the https://people.xiph.org/~xiphmont/demo/neil-young.html link. Now i know for sure that the higher res files (beyond cd quality) don't matter to me and that I couldn't really tell a difference between Spotify at high quality sound setting and Amazon cd quality or ultra high resolution sound quality. Of course i also discovered on the audiocheck.net website that i can't hear anything above 13kHz either!
Amazon Launches Lossless "Hi-rez" HD Music Service