You can't have two devices replace the tv sound at the same time. Even if both were Roku brand it's either the Roku wireless speakers or the soundbar. If you pick the soundbar, then the wireless speakers can be paired to the soundbar itself to be used as rear speakers in a surround sound setup. They do sell TCL branded soundbars that are Roku ready, it pairs just like Roku branded just don't have the built-in streamer. They have to follow the same limitations as Roku brand, sorry.
Edmund
Roku Community Streaming Expert
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