Since I Started college 10 years ago I have been verg strict when listening to music. I used to listen and download new music each day, couldn't listen to a mp3 @128kbps and I could easily tell the difference between 128 and 320 Easily but nowdays I can't. Tried replacing my cheap Z312 logitec speakers with Beyerdynamics DT 770 PRO but couldn't notice difference neither Did MP3 encoding just got better over the years or my ears are not so good like they used to be?