I read in the MIX Insider Audio feature that a recent study published by
the AES shows people can't hear the difference between hi def (SACD or
DVD-A) or cd quality (44.1x16) audio. The test group included men,
women, audiophiles and audio professionals. They used a variety of high
end equipment and a variety of program material including audiophile
material from Chesky, Telarc, etc.