Thanks for posting here in the Roku Community, @PSL1!
We see that you're having trouble using the surround sound feature on your Spectrum TV app with your Roku Ultra, and we'd like to assist you.
If this is the only app experiencing problems, we recommend contacting Spectrum TV app support for further assistance. They can provide troubleshooting steps specific to the app, as they manage and maintain their own channels.
In the meantime, you may visit this support article: How to set up your Roku® streaming player for surround sound.
We hope that everything will be sorted out soon for you.
All the best,
Emman
Emmanuel-D.
Roku Community Moderator