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As title suggests, I am experiencing the video being ahead of the sound with my Beam 2 and LG OLED C3. I’ve been through all the various settings/pass through etc on the TV, and if I run eg a YouTube av synch video, the audio is approx 75ms ahead of the video. (And to be clear, the sound through the TVs speakers is in sync, and it occurs with all sources eg Apple TV, the TV apps, and Sky Q - which is actually worse, so that I think is a separate issue). The TV dialog sync only allows delay. 
 

I might be answering my own question in that it may not be technically possible to ‘advance’ the sound on the soundbar, but is there an ARC compatibility problem with LG TVs that is creating this issue? 
 

I am not the only person experiencing this according to forums. 

Unless the TV Dialog Sync option is set to add delay Sonos will play the audio as soon as it receives it. To advance the sound it would have play audio it doesn’t yet know about. 

 

But you said “if I run eg a YouTube av synch video, the audio is approx 75ms ahead of the video”. Did you mean “behind”?

Apologies, I meant “behind” the video (mixing up my + and - from the calibration video), so obviously delay makes it worse. As you say, I’m probably tackling this from the wrong end, as a video delay is actually needed, and presumably the TV and sources are the only ones that could do that. The Sky Q is particularly problematic, as that works absolutely fine with it set to “stereo”, but as soon as it’s switched to DD or DD+, the sound lags the video by far more. Annoyingly, my old LG (B6) allowed negative adjustments, but the new TV doesn’t. 

I’d better step back and let an LG user chime in. I have a Beam/g2 on a Samsung Neo QLED and amazingly it just works.

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