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.
How to Play DTS Audio on Your Sonos Beam & Arc Soundbar
Apple TV 4K, Sonos Arc and Dolby Atmos - Apple Community
Sonos Arc Breaks Software Compatibility for Dolby Atmos — Techsponential
Sonos finally adds DTS audio support to its home theater lineup - The Verge
Sonos Arc - no sound with Dts audio | Sonos Community
Understanding Dolby and DTS Surround Sound Formats