I have a 55" Samsung 4K Smart TV, Samsung 4K Blu Ray/DVD play and RCA sound bar. The DVD player is hooked into the TV using HDMI. I've used an optical cable to connect the TV to the sound bar. I get sound through the sound bar when watching a disc, but anything via any of the "apps" on the TV (Amazon, Hulu, etc.) there is no sound and I have to revert back to the TV speakers. I would assume that the optical cable would work for both the Blu Ray player and the TV, yet I get no sound when watching just the TV.