resurrecting this thread to ask for clarification on something -
the only way i have found to matrix 2-channel stereo SACD'S to multichannel with my receiver (Onkyo 805) was to de-select 88khz from the ps3's audio output screen. That also let me matrix regular stereo music streamed from my computer....even after de-selecting it, I can hear SACD at 88khz according to my receiver (SACD multichannel still plays at 176khz, too).
I really like the sound of all-channel stereo from the 805 with 2.0 sacd's, but am missing out on a lot letting the 2.0 sacd's downsample to 88khz?
is there a better way to go about this?