May be someone could correct me as well as advice me on this. As I understand it, Hybrid SACD has two layers. The Red Book CD layer is inferior to the 4.7 GB HD layer but can reproduce in stereo. What happens when a SACD is played in a universal player such as Denon DVD-2900 into stereo amp and two speakers ? 1. only get L&R channels and lose music on other channels; 2. can be set to play the CD layer. You hear all the music in stereo but not in HD; 3. or the ideal senario: universal players (and may be also SACD players) can convert HD into stereo and you get the best out of SACD. Apparently there are over 4,500 SACD releases. Are they worth a punt for 2-channel stereo use only using a universal player? And since frequency response extend to 100 kHz, do you need Sony amps and super tweeters to benefit from SACD?