I’ve been having this issue for about a week now. I had a Vizio soundbar for 5 years and it just lost power suddenly and died. Gone forever.
So I replaced it one after another with what is now at a count of 5 sound bars across 4 brands. Samsung, Vizio, Yamaha, and now LG. All of them, whether connected via HDMI-ARC or Optical, whether the TV is set to PCM or Dolby Digital or DTS, and whether I connect the sound bars directly to the devices (the TV for the built-in apps on Roku, Xbox One X, etc) there is ALWAYS a lag. It starts off relatively small and then as I leave the channel/app/whatevs playing, it becomes quite significant.
I can always tell that it’s happening because if I turn the TV speakers on, there becomes a very clear echo. The video seems to come first with the audio delayed. The TV speakers seem to play before the external source will. My TV doesn’t have any sort of delay adjustment and any AV delay adjustment that sound bars have had are all to just ADD +10-300ms delay to the audio, which makes it even worse.
Does anyone have any idea of what’s going on here? Is there anything at all left that I can do, or do I just have to waste money on a new TV without Roku and hope that it also doesn’t have the issue?