sonos arc/samsung tv/apple tv 4k strange sound issue

Hi, I know there are countless issues with this setup but fortunately I do not suffer from any of the regular problems. The issue I have is a problem mainly with the voices on any app on the Apple TV 4K, the voices especially male voice seem to be distorted almost too deep and slightly slowed down (they sound like Bane) but there are no audio/picture sync problems. If I use the tv ‘s built in apps with the same shows the problem is not there, I can only replicate the problem with the apps on the apple tv. I can solve the problem with changing certain settings on the tv but the solution is not ideal and I lose Dolby digital 5.1 in exchange for Stereo PCM with the appletv even though I still get Atmos.

The setup that ends up with distorted voices with the apple tv is

Samsung qn95a sound settings

Output-receiver(HDMI-eARC)

HDMI-eARC Mode-Auto

Digital Output Audio Format- pass-through

SONOS Arc connected to HDMI eARC

Appletv4k- sound settings.

Default audio output- Receiver speakers

Audio format-Off

Immersive audio-On

With the above settings the sound is perfect on the TV’s inbuilt apps/skyQ etc and I get the shows in their correct audio formats eg Dolby digital 2.0/5.1/Atmos etc. but I get the voice distortion on the 5.1 shows on any app on the appletv; 4k Atmos seems fine. I have tried Gen 1/2/3 appletv4k and the issue is there on all of them. To get rid of the problem I change the Digital Output Audio Format setting on the Samsung tv from pass-through to Auto and the distortion disappears but all 5.1 shows now only play in Stereo PCM but Atmos is still available.

I have changed hdmi cables and my current cables are certified 2.1 48gbps cables so I don’t think that is the problem. Has anyone else experienced this issue with a similar setup and has anyone come across a solution apart from the work around I have mentioned? Thanks in advance.