“I just connected the SJ9 via HDMI ARC to my OLED B7 and don't know why most of the Sound settings on my TV are now grayed out (Dolby ATMOS, Smart Sound Mode, Sound Mode Settings, Magic Sound Tuning, Volume Mode). Is this normal?”

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• Yes, this is normal. The Sound setting are for the TVs “Internal” audio processing. With ARC, the Volume is now being controlled by the soundbar not the TV. ^AC

  Answered by LG Digital Customer Care 7 years ago

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• This is normal. LG SJ9 changes the audio mode automatically. If you want to check the audio input in your Soundbar, use Info button of Soundbar remote to see the input type.

  Answered by Deep 7 years ago

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