Audio Return Channel, or HDMI-ARC, enables a TV to send the Axiim Q audio over the HDMI cable. HDMI-CEC must be enabled for ARC. ARC is supported on modern TVs that are HDMI 1.4 or higher. To use ARC, the Q must be plugged into the HDMI Input port on your TV labeled as ARC. Check your TVs manual or website if there is no label.