How can I connect an external audio device like a soundbar to my TV?

To obtain better TV audio quality, connect a soundbar or A/V receiver to the TV. If you connect an external audio device using an optical cable, the Sound Output setting automatically changes to the connected device, but you must turn on the external audio device before connecting the optical cable. You can also manually change the Sound Output setting via Menu > Settings > All Settings > Sound > Sound Output. (Page 22)