Sony VGC-RA820G - Manual (Page 41)

Configuring Software for Your Speaker System
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6 From the section, Audio Speaker Configuration, select 6-channel speaker
(5.1 Home Theater) or the desired speaker configuration.
To enable S/PDIF, go to Audio Output Configuration and select Digital
(S/PDIF) out to External Processor.
7 Click Apply, and then click OK.
✍
InterVideo® software automatically detects the speaker system setup. You may notice
that some options are disabled.