1. The HDMI ports are situated on the back of the TV.
2. Insert the HDMI cable into the HDMI 1 (ARC) port.
3. Insert the other end of the HDMI cable into the HDMI ARC port.
4. To set the sound output primarily through the External Speaker press Home.
5. Scroll to Settings and press OK.
6. Scroll to Audio and press OK.
7. Scroll to Speakers and press OK.
8. Scroll to Off and press OK.
9. The TV speakers are now off Roku TV will now play audio only through the external connected speaker. Press Home to return to the Home menu.