"Arny Krueger" wrote in message
...
There are no known CDs and SACDs that were mastered identically and
comparably, subject only to the differences in the media.

This is incorrect. In fact, I have just finished producing such a
disc. The new Musical Fidelity SACD of Mozart's Clarinet Concerto
has 4 versions of the same mike feed. The DSD layer contains a pure
DSD version and a DSD dub from analog tape; the CD layer contains a
Red Book PCM version prepared from the DSD master and a straight
PCM dub from the analog tape.

This disc will be available for sale from www.stereophile.com at
the end of June, and an article on its making, including an
interview with engineer Tony Faulkner, will appear in the August
issue of Stereophile.

John Atkinson
Editor, Stereophile