Yeah, the basic box has coaxial digital audio, but only like HBO, Showtime, etc really have 5.1 audio. The rest of the channels are standard 2 channel DD. Svideo/Composite really doesn't matter ...
There are only two ways to get digital audio between your TV and soundbar, or your TV and receiver, or really between any piece of gear that transmits audio in a home A/V system: HDMI and optical.
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