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These HDMI features are everywhere—but what do they do?

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ApoJodly 8K HDMI ARC/eARC Cable for Soundbar 6.6FT, eARC HDMI Cable 2.1 Dolby Atmos 48Gbps High Speed HDMI Cord (8K@60Hz 4K@120Hz 2K 3D HDR HDCP 2.2&2.3) for Vizio Samsung Bose Sound

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So I'm a noob with all of this. Would I connect my PS5 to either HDMI 4 or 3? Why is eARC/ARC only on one also and isn't that merely for speakers?

HDMI ARC and HDMI eARC: Everything to know - Reviewed

What is eARC? The audio technology explained

HDMI ARC and HDMI eARC explained: The evolution of the Audio Return Channel

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