If by your question you mean ... can I pop a multichannel SACD into my SACD player and play it through my 2 channel system and my SACD player will recognize the SACD layer(s) of the disc and play the SACD ... the answer is "yes." You will just hear "SACD sound" from 2 speakers. Logically, this is not different than playing a DVD video through a DVD player connected to a 2 channel stereo system.
Try this site for more detailed information about the different types of layers possible on a SACD ...
http://www.licensing.philips.com/information/sacd/
Try this site for more detailed information about the different types of layers possible on a SACD ...
http://www.licensing.philips.com/information/sacd/