Marantz SR7013 Owner's Manual page 76

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Connection 1 : TV equipped with an HDMI connector and compatible with the ARC

(Audio Return Channel) / eARC (Enhanced Audio Return Channel)

Use an HDMI cable to connect a TV that is compatible with the ARC / eARC function to this unit.

Set "HDMI Control" to "On" or "ARC" to "On" when using a TV that supports the ARC function. (v p. 202)

Using an eARC function-compatible television enables audio playback from the speaker connected to this unit, regardless of "HDMI Control" and "ARC"

settings in the menu.