For the audio receiver control Sound Out, firstly you must have a device which supports HDMI Sound Out, then connect it to the HDMI2 port. When the "Sound Out Setting" is enabled on your TV, the TV set's speakers will mute automatically and the audio will be outputted on your sound device system
This is what your TV manual says! What a way to confuse customers! A reviewer in amazon says it has ARC another says it doesnt! A couple of people have mentioned using a home theatre. So I guess you can try and connect a sound bar through hdmi and test.