bigshot
Headphoneus Supremus
if your headphones are good enough you can easily hear the difference between file capped at 22khz and file capped at 19 Khz
Not likely. The difference between 19kHz and the upper limit of human hearing is a small fraction of a note on the musical scale. Most people over 30 can't even hear up to 19kHz. And it doesn't matter anyway, because recorded music doesn't generally have any audible content up there anyway.