Hello All! 
 

I am looking for the best possible audio settings based on my Samsung QN90B, Apple TV 4k 3rd Gen and my Sonos Beam Gen 1. I am using the HDMI to connect the Beam to my TV. 

1. What setting should I select under my Apple TV Audio Format? Change Format > Off OR On with Dolby Digital 5.1 as the new format? 
    
2. Samsung TV settings - if I select change format on within the Apple TV settings, I get three options under the Samsung TV digital output audio format: PCM, Auto or Pass-Through. if I leave change format off within the Apple TV settings, I only get Auto or PCM. 
    

Overall, what do you think would be the best settings recommendation for my set up? Note that when I select Dolby digital 5.1 with an Apple TV I feel like I’m getting some lip sync issue. Is that normal? 
 

Thank you in advance for the help!