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Hello. Thank you for your question. Yes, the Insignia NS‑SB512 5.1.2 Dolby Atmos/DTS:X soundbar is fully compatible with the Roku 50" Select Series 4K Smart TV (50R4A5R / 50R4AX), because your Roku TV includes the required HDMI ARC port for full‑quality audio and also supports optical output as a backup, so you can connect them easily and enjoy full surround performance with no compatibility issues. Darshan | Insignia
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