what is the difference between hdmi arc and earc?

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Etzin 8K HDMI 2.1 eARC Audio Extractor 7.1CH HDMI ARC eARC To Coaxial Optical Toslink SPDIF Stereo Analog Audio Return Channel Adapter : : Electronics

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what is the difference between hdmi arc and earc?

HDMI ARC vs eARC, Which One Is Better for Your Home Theater? - The Plug - HelloTech

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Difference between HDMI ARC and eARC

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