I think only the early releases from Sony were single layer because they hadn't perfected dual layer yet.
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Perfected dual layer? My third SACD player (all Sony models) just started crapping out by not recognizing the SACD layer on hybrid discs. No problem with the single layer ones because there's nothing else to recognize! I haven't noticed any sonic difference, though it would be hard to tell unless the same performance was released in both single-layer and hybrid form. Dave