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You can use a certified cable with the HDMI logo for the LG - 2.1-Channel S40T Soundbar with Wireless Subwoofer, Bluetooth Connectivity, Dolby Audio, and WOW Orchestra - Black, Model # S40T. While any HDMI 1.4 or higher cable will technically work for basic ARC, the best choice is a Certified Premium High Speed (HDMI 2.0) or Ultra High Speed (HDMI 2.1) cable, which supports 4K, ARC, and eARC functionality, and using a newer, high-bandwidth cable ensures better reliability and future-proofs your setup for uncompressed audio (eARC)...^Ivan.
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