Considerable lag on a Sonos Beam when going from PCM to Dolby Digital on a 2017 Samsung TV and an Apple TV as the source. I tried both HDMI and optical adaptor.
Sonos Santa - LPCM finally!!! : r/sonos
Sonos Beam Gen 2 review | Stuff
Sonos Beam (Gen 2) Review: Big upgrade for small TVs | Trusted Reviews