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.
Intermittent and repeated loss of sound via (e)ARC from Sony TV
Resources Archives • Home Theater Forum
Issue with TV ARC connection on two Samsung TV's and soundbars
Audio cutting out on soundbar when using 4K player : r/hometheater
No Audio or Sound from Soundbar connected to the TV? Here's what to do
Samsung Q950A 11.1.4-Channel Soundbar Review, Page 2
Sonos Amp w/soundbar and subwoofer connections question.
How to play back in Dolby Atmos format audio with your amplifier or Soundbar?
Introducing myself and a question about my new soundbar.
Optical vs HDMI ARC,5 Differences and Which One You Need?