Optical from my TV. No bother, it just plays whatever I throw at it but I'm sure that Plex will be able to detect it's not DTS and only present DD to the soundbar.
That's good. My Samsung TV will not passthrough DD from an HDMI connection so I would need an optical switch to get multichannel from my PC. I don't have a massive DVD/BD collection so the DTS isn't too much of a worry and I believe Netflix is DD? So tempted to get one, just have some niggling doubts