[griff2]

The limits of human hearing is 20kHz, right? And a 24/192 recording goes up 9 times above that, right? What benefit is that adding? Don't DACs filter out high frequencies anyways? I have not had the opportunity to compare hi-res to redbook, but I am confused by the principle of hi-res audio. Any explanations?

I used to think it was analogous to the photography explanation, but it isn't.  This link might shed some light on the subject.