Here is my setup -
All of my video (SAT, BluRay, AppleTV) are connected via HDMI to a 4x1 HDMI switch with TOSLINK audio output (monoprice #5557). From that switch I send the HDMI to the HDMI1 input on my UN55F8000 and the TOSLINK from the switch to optical input 1 on my Onkyo AVR. NOTE: My Onkyo AVR is pre HDMI so that is why I have the 4x1 HDMI switch w/ TOSLINK. Lastly I have the TOSLINK output from the UN55F8000 connected to optical input 2 on my Onkyo AVR.
Now - when I use the native apps on the UN55F8000 I have to use either the internal speakers, or switch my Onkyo AVR to optical input 2.
When I want to watch my SAT, BluRay, AppleTV I have to switch my Onkyo AVR to optical input 1. I select which source (SAT, BluRay, Apple TV) using the 4x1 switcher. This is a great switch as it has TOSLINK output.
What I was trying to do was remove my 4x1 HDMI switch and use the UN55F8000 as my media hub. Connect my SAT to HDMI1, BluRay to HDMI2, and AppleTV to HDMI3. Then connect the TOSLINK output from the UN55F8000 to Onkyo optical input 1. Then I could use the UN55F8000 to switch between my SAT, BluRay, AppleTV and native Smart Apps with Dolby 5.1 going to my receiver from the UN55F8000.
Well since the TOSLINK output from the UN55F8000 does not support Dolby 5.1 passthru when viewing a HDMI input the configuration I was trying to achieve appears not possible. Maybe with an ARC compatible AVR? I don't know since I don't have an ARC AVR.
IMO its a shame to have a 'smart' TV but can't use it seamlessly in a theater setup.
Lastly, the performance of the 'Smart' apps seems slower than the similar apps on the AppleTV.