I have a lipsync issue when I use my Apple TV 4K with my bluesound soundbar (pulse+). I have a Philips 65oled804. The Apple TV is connected to the TV via HDMI 1 eARC. The Bluesound Soundbar is also connect to the TV via HDMI 2 eARC.
Hi shrek241,
Thank you for participating in the Apple Support Communities. We understand you have audio syncing issues when connecting your sound bar with your Apple TV 4K. This article can help with making sure everything is set up properly: Set up Dolby Atmos or surround sound on Apple TV with a sound bar or AV receiver.
"Learn how to play Dolby Atmos or surround sound on your Apple TV with a sound bar or AV receiver.
Set up Dolby Atmos or surround sound
*Some sound bars and AV receivers support Dolby Atmos, but don’t support video formats like HDR10 and Dolby Vision. In this case, you can plug your Apple TV 4K into either the sound bar or AV receiver to play sound in Dolby Atmos. Or you can plug your Apple TV 4K into your television to watch video in HDR and Dolby Vision. To do both, you need a television or an AV receiver or sound bar that supports both Dolby Atmos and high-quality video formats. Apple TV 4K uses a high bandwidth form of Dolby Atmos that doesn’t work over ARC connections.
Check if Dolby Atmos is set up
On your Apple TV 4K, go to Settings > Video and Audio and select Audio Format. Under Immersive Audio, check that Dolby Atmos is on. If you don't see Immersive Audio and Dolby Atmos as an option, you might need to change how your home entertainment system is set up.
Some Dolby Atmos-supported content might show 
in its audio info.
.."Also, this article can help with adjusting your audio settings if needed: Adjust video and audio settings on Apple TV.
If that doesn't help, you may consider contacting Philips support for further assistance.
Take care.
Hi shrek241,
Thank you for participating in the Apple Support Communities. We understand you have audio syncing issues when connecting your sound bar with your Apple TV 4K. This article can help with making sure everything is set up properly: Set up Dolby Atmos or surround sound on Apple TV with a sound bar or AV receiver.
"Learn how to play Dolby Atmos or surround sound on your Apple TV with a sound bar or AV receiver.
Set up Dolby Atmos or surround sound
*Some sound bars and AV receivers support Dolby Atmos, but don’t support video formats like HDR10 and Dolby Vision. In this case, you can plug your Apple TV 4K into either the sound bar or AV receiver to play sound in Dolby Atmos. Or you can plug your Apple TV 4K into your television to watch video in HDR and Dolby Vision. To do both, you need a television or an AV receiver or sound bar that supports both Dolby Atmos and high-quality video formats. Apple TV 4K uses a high bandwidth form of Dolby Atmos that doesn’t work over ARC connections.
Check if Dolby Atmos is set up
On your Apple TV 4K, go to Settings > Video and Audio and select Audio Format. Under Immersive Audio, check that Dolby Atmos is on. If you don't see Immersive Audio and Dolby Atmos as an option, you might need to change how your home entertainment system is set up.
Some Dolby Atmos-supported content might show in its audio info.
.."Also, this article can help with adjusting your audio settings if needed: Adjust video and audio settings on Apple TV.
If that doesn't help, you may consider contacting Philips support for further assistance.
Take care.
Lipsync issue when I use my Apple TV 4K and bluesound pulse+
