Girlfriend recently bought a Samsung UN55HU8550F 4K, demo model, no manual. I've been trying to get Netflix audio (using the TV Netflix app) out to a Harman Kardon SB16 soundbar via optical with no luck. I see a setting on the TV to choose speaker/audio out, but changing that doesn't seem to do the trick. Audio from her Sony Blu Ray Netflix app is fine, so I think it's a Samsung setting. The Samsung Netflix app is much more graceful than the Sony, so I'd like to figure this out!