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Hello, my name is Rusty. The TV doesn't have to support Atmos, that's the job of the soundbar. Connect your HDMI devices directly to your soundbar, then connect your soundbar's HDMI out to your TV. Anything plugged into your soundbar will now play Atmos, as long as the audio is encoded in Dolby.
To get your TV smart features working, go into your TV's menu, and set the audio output to HDMI ARC. This will output sound from your TV to the soundbar. Let me know if you have any questions.