I was told by chat support that portal tv does not support sound bars. LG TV with LG sound bar had to be very common. But when portal tv from HDMI to sound via optical out, it cuts off lots of sound especially the first part of their talking. I don't have similar problems with Chromecast or Blu-ray. When I set it to TV internal speaker only it works fine but the sound is not as robust and it's annoying to toggle back and forth.