ARC (Audio Return Channel)This TV supports 3D and ARC (Audio Return Channel) functions via an HDMI cable. ARC enablesdigital sound to be output using just an HDMI cable. However, ARC is only available through the HDMI(ARC) port and only when the TV is connected to an ARC-enabled AV receiver. Connect the HDMIcable to the TV's HDMI (ARC) connector and the device's HDMI output connector.Headphone ConnectionRefer to the diagram and connect the headphones to the headphone output connector. Only useheadphones with a 3-conductor TRS type jack. The headphone volume and the TV volume areadjusted independently of each other. While the headphones are connected, the TV speakers are mutedand certain Sound options are deactivated." This option is only available for LED TVs.