Thanks for reaching out here in the Community!
Audio problems on the Roku, like no audio, distorted audio, or audio dropouts, can be caused by software settings or problems with your hardware and/or cables depending on the complexity of your setup. Please follow the steps below to troubleshoot this issue.
1. Check to make sure that your A/V receiver, HDMI switcher, or speaker is connected to your Roku with the HDMI, optical, or component cables properly put into both ends.
2. Make sure all of your components are powered on.
3. Verify that the correct input is selected on your A/V receiver, HDMI switcher, or soundbar.
Here's a link to our support page to find out more to troubleshoot the audio issue:
Why is sound from my Roku® Streambar®, Roku Streambar Pro, or Roku Smart Soundbar out of sync with t...
Hope this helps! Let us know if you have any other concerns.