Redbook layer on SACD - good enough?

yeah, but the existence of the transparent layer could pose a problem for the cd player's optical pickup, no? The cd pickup (780 nm) would have to read through the transparent layer designed for the 650 nm SACD pickup, no? might that affect the sound quality of the transport? I don't know for certain, I am just asking. Or is it totally transparent?

I would imagine this would have been discussed to death on AA.

"is it common to manufacturers to make CD layer worse then SACD layer intentionally?"

Dunno. They have been accused of it but, aside from the DSOTM SACD, I know of no evidence.

KR4-I have the new Miles Davis box set The Complete Jack Johnson-it was mastered using the DSD process but it is NOT a SACD nor hybrid.
So if the information on this is correct then the DSD process can be used to make CD's as well as SACD's.

It's been my experience with hybrids that the mixes are identical on the different layers-it's just the actual replay formats that are different.
As such any difference is down to the superiority or otherwise of the format.
I've found the Redbook remastering all recent hybrid SACD's with the exception of DSOM to easily beat their previous incarnations on CD.

In addition to all his other comment with which I concur, Ben Campbell wrote: "So if the information on this is correct then the DSD process can be used to make CD's as well as SACD's."

Only if it is converted to PCM as it usually is. I was questioning 'lafish' saying that he had played DSD on his CDP.