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.
Multichannel PCM 5.1 dropping out since 14.10 update | Sonos Community
Sonos Beam Gen 1 vs. Sonos Beam Gen 2: Is it worth the upgrade?
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