Redbook Quality on Hybrid SACD's


Is it necessarily the case that listening to the redbook layer on a hybrid SACD would be any different from listening directly to a redbook CD? I am about to purchase "Opera Arias", a new (and first) release by Anna Netrebko. I have a universal DVD player (Pioneer 563a) that I could play the SACD through, just out of curiosity. But I don't want to lose quality when played as a normal CD. Advise? Thanks.
peter_s
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redbook layer of Hybrid SACD is definitely sounds better than normal CD. However, this layer still cannot compete sonic with SACD layer in SACD player, even if you put redbook layer into decent player at 10 times price of SACD player.

I did detail testing on this issue, software I tried:

Kenny G Live
Norah Jones - dark blue cover (cant remember title)
Aaron Neville - Natural Boy
I too found that the Redbook layer of a Hybrid SACD is usually better than its regular CD equivalent (about 70% of the times). However, I would have to agree with Rcprince. Unless the original recording has been remastered for SACD production, chances are that the two CD versions are the same sonically.
I've owned some classical recordings that were produced and released on CD in early to mid-90's. When I played the Redbook layers on the Hybrid SACD's of these same (but remastered) recordings, I hear a noticeable difference, mainly a more balanced and focused sound. Could this be due to a better CD mastering process (XRCD comes to mind)? I don't know the answer...
I think there is some variation here. Yes, there was a recent thread on AA Hi-Res about this. In any event, although I am still out to lunch on this topic even after reading all the posting, I can confirm that some CD layers on SACD hybrids sound better than their redbook only predecessors (Tommy, some of the Stones, etc) and, some are a disappointment (Elton John GBYBR for example).

I don't think there is consistency here.