I have the new Beam hooked up to my LG C1 via eARC. I have eARC / Atmos enabled on the TV. The volume seems to vary wildly from channel to channel when I am watching YouTube TV.
I have noticed in the Sonos app that the volume variations seem to be driven by the source codec, e.g. PCM 2.0 is much louder than Dolby 5.1.
It is almost as though the Beam is dipping its volume when the audio format supports more speakers, like it’s expecting the volume to be supplemented elsewhere.