Only SACD discs that are "Hybrid" (2-layers) can be played on regular CD players.
My Pioneer dv45A player (SACD and DVD-A) has both Stereo and Multichannel analog outputs (as well as digital optical which I use when playing regular CDs). There is no digital output from SACD or DVD-A. To the best of my knowledge the Stereo output is a "Mixdown" of the multichannel. It is not the different area of the disc (because it is there simultaneously with the Multichannel signal) and it isn't the second layer (because it is there for SACD which are not "Hybrid"). So my player, and probably others, can give you just 2 signals, for stereo, even if the Disc is multichannel.
My Pioneer dv45A player (SACD and DVD-A) has both Stereo and Multichannel analog outputs (as well as digital optical which I use when playing regular CDs). There is no digital output from SACD or DVD-A. To the best of my knowledge the Stereo output is a "Mixdown" of the multichannel. It is not the different area of the disc (because it is there simultaneously with the Multichannel signal) and it isn't the second layer (because it is there for SACD which are not "Hybrid"). So my player, and probably others, can give you just 2 signals, for stereo, even if the Disc is multichannel.