“Re: Sony HT-S350 sound bar with subwoofer. Install states if TV does not have an "ARC" HDMI connection then an Optical Digital cable is supplied . What is the difference between a regular HDMI connection and an ARC HDMI ? What does optical cable do?”
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HDMI ARC is for audio and a regular HDMI connection does not have that Audio Return Channel. Optical is an audio cable that will carry audio from the TV to the sound bar.
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