Bob's hit the nail on the head. You need to use the six channel analog input any time you want to listen to SACD's or DVD-Audio discs. "Six channel stereo" is a processing mode for stereo audio sources (digital or analog). This link (to part of my 950 review) might help you automate the switch to six channel.

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gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review