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From my memory, ALL TVs with a digital optical output will only output 5.1 sound from the internal tuner. Anything coming in from a TV input will be down-converted to 2 channel stereo over the optical out. It was something the TV manufacturers agreed to in order to fend off a lawsuit from content providers, and get Dolby Digital certification.

The only way to get Dolby Digital is through an HDMI audio return channel, as there are HDCP copy protection protocols for HDMI.

It's kind of the audio equivalent to DRM downrezzing over component cables from Blu-ray players.
 
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