What is HDMI ARC and which port supports it?

HDMI ARC (Audio Return Channel) is a feature that allows you to connect a Home Theatre System without needing a separate audio cable. Only HDMI IN 1 (ARC) on the TV supports HDMI ARC. If your Home Theatre System also has HDMI ARC capability, connect it to HDMI IN 1 (ARC) on the TV so the HDMI connection combines both video and audio signals.