I'm guessing you also have the DVD connected digitaly, and your receiver is not auto-switching over to the analog inputs- still using the digital Toslink/Coax connection which very likely is ouputing 2 ch. PCM.

Try checking your receiver and verify you can select the analog input for your SACD music mode. You could also try disconnecting the digital cable, leaving only the analog to verify what you're hearing is coming from the analog side.

Good luck.

-Dave

M80s VP150 QS8s EP500s
ravenmanor.com/cinema/