I have a 7.1 system with side and rear surrounds, and I am not sure which of the many decode options on the 818 will provide the best sound. "Best" differs for everyone of course... in this case I would say it means making the best use of all the channels I have, to provide a strong surround effect.
If I have a 7-channel source, like a DTS-HD Blu Ray, do I need to know how the disc is encoded to choose the best decoder? For example I can imagine that some movies are encoded with side surrounds, and some without.
I know PLIIx matrixes sound to drive side surrounds, but is there a better choice for content that is already 7.1 channels?