Help getting started with Roku devices, including setup, connecting your device to your TV, linking a Roku device to your account at my.roku.com/link, adding channels, subscribing to services, and more.
You don't connect soundbars by bluetooth to any type of roku, you use hdmi arc or combination of regular hdmi along with optical. That's for roku tv's and non- roku tv's, in the case of roku express you don't connect to it directly at all. Express doesn't have bluetooth, and what roku that do are bluetooth receivers only, they aren't transmitters.
I know this is a closed issue, but I have been told that you need to get at least a Streaming Stick Plus for a projector because they only work with an RF signal for the remote. Another reason the Express wouldn't work.