I try with surcode dts with pretty good results, and the sound is fantastic !
I tried to synchronize it by watching the UHD video on Prime and listening to the DTS on the receiver, but it's out of sync. I think the movie is in 24 fps and the UHD is in 23.976 fps. Regarding the soundtrack, there's no difference between the Dolby Digital UHD Prime and the DTS Cinema. I read on another forum someone explaining the different sound levels recorded on the media, and that by increasing the volume or correcting the LFE level to bring it to the same level, the differences disappear. I managed to recreate the dynamics of laserdiscs on Blu-ray and DVD. That's actually good news.