Installed basic Samsung TV and Sonos Playbar setup today with DirecTV. I had the TV and DirecTV box powered off and was trying to demo just the music throught the Playbar, but the Sonos app kept trying to jump to TV audio as if the TV was sending an audio signal. Checked the optical cable going into the Playbar which is showing red even though the TV was powered off. WTF? I've never noticed this before but maybe it's standard. Anyway, turned off HDMI CEC in the TV, and no more optical light out with TV off. Not sure what this would be for in terms of HDMI control. Maybe it's some kind of extra communication to Samsung soundbars.