Hi @Santahoot2,
Thanks for reaching out to Roku Community!
We apologize for the inconvenience you have experienced with your new Roku Ultra. It sounds like you have tried multiple troubleshooting steps to resolve the sound issue but to no avail. In order to assist you in resolving the issue, we would like to gather more information.
Do you have a surround sound system on your TV? Does your Roku device is connected directly to your TV? Additionally, have you tried switching the HDMI port that your Roku is connected to on your TV to see if that resolves the issue?
Keep us posted on what you find out.
Regards,
Nimfa