From the last time I have checked Sony SDDS is 9.2 discrete, there also ways of matrix decoding other channels from this to equate to 12.2
For Instance working front most to back and left to right
Left
Left Center
Right Center
Right
Left Matrix
Right Matrix
Left Rear
Right Rear
Left Matrix 2
Right Matrix 2
Left Surround Back
Right Surround Back
Then there would be two LFE Channels behind the screen
~Bob