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From my understanding it just allows you to use only one cable (HDMI) if you use the arc input. I believe if you if you use another HDMI, you would need an audio output cable as well. So to summarize the arc input allows much more plug and play verses using mutiple cords. Use this reference: https://www.tomsguide.com/us/hdmi-arc-faq,news-26262.html
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