Hi @cph4309,
Greetings from the Roku Community!
We're glad to assist you with your inquiry. Please be advised that if you are not using ARC, use the Premium High-Speed HDMI Cable to connect your Streambar or soundbar to any available HDMI port, and connect the included optical cable to the digital audio output on your TV.
You can also check out this support article here on how to set up your Roku Streambar Pro or Roku Smart Soundbar.
We hope this helps.
Kind regards,
John
John
Roku Community Moderator