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HDMI 2.1 Specification Overview
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HDMI ARC and HDMI eARC: everything you need to know | What Hi-Fi?
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HDMI 2.1 Active Optical Cables - Qualtek Electronics | Mouser
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Ultra high speed HDMI 2.1 spec released, with a new cable to boot
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HDMI 2.1: What You Need to Know | PCMag
HDMI 2.1: What you need to know - CNET
