I reckon that most folk wouldn't notice 20ms unless they were really, reallylooking out for it, so that seems reasonable.
Somebody visibly knocking on a door, firing a gun, etc.
20ms of delay is the equivalent being just under 7 metres from the source of a sound - barely perceptible in almost every circumstance.
My folks have a lower midrange LG TV from a few years back that is absolutely abysmal with external audio peripherals. Anything connected via Optical/ARC gets ~100ms of delay. I let them borrow my Sonos kit while I was between homes and they were both completely oblivious to the sync issues.
I have a background in audio engineering, so I suspect that I'm far more sensitive than average to this sort of stuff, but I just couldn't deal with it.
(, Thu 2 Feb 2023, 21:03, Reply)