If I'm going to use the Beam on its own without a sub or rear speakers, will I lose much by doing this switch?
In other words, with this simple set up is PCM stereo enough to provide high quality sound from an Apple TV 4K connected to a TV with the Beam connected to the TV through an HDMI ARC port?
Best answer by ratty
I suspect there could be some setup issues and/or confusion with those reviews.
All Sonos HT units -- PLAYBAR & PLAYBASE being the historical examples -- are designed to have minimal latency, and in practice it can be quite hard to notice a loss of lip-sync. Where an audio lag is noticeable is if other rooms are grouped with the HT player for TV sound. This is because the grouped players require more network buffering to avoid dropouts.
As for PCM vs DD5.1 in my experience there's no difference in latency. But, to your question, in practice a PCM stereo signal will sound pretty much the same as a DD5.1 one when played through a 3.0 HT unit.