I just swapped out my playbase with an Arc. It sounds great, but I am trying to get it to play Dolby Atmos content. I have a 2017 LG OLED B7 TV that has an ARC output (not eARc). I have found a few streaming sources with Dolby Atmos content, but it will only play through the TV speakers (when switches to internal speaker). Any help would be greatly appreciated.