If you're curious about the label "ARC" you might see below some HDMI cables, this is the place to find out how it can improve your soundbar.
Nakamichi reveals Shockwafe Ultra 9.2 eARC soundbar • Home Theater Forum
Having trouble getting surround sound working.
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Having trouble getting surround sound working.
HDMI ARC input not working?
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Can you use a sound bar that is connected by HDMI ARC with another device (AV Receiver)? - Quora