Good Evening Everyone. Please please please help. I've purchased a Panasonic OLED 55 inch TV. It's a TX-55EZ952B. I also have a few other bits and pieces. The reason for listing these will become clear. Sony STR-DN1050 Apple TV 4 (not 4K). Sony PS4 Much to my delight about 3 weeks after purchasing my TV those lovely plex people released a native plex app capable of paying back lovely 4k files natively from the TV. Now here is what i am trying to achieve. I have my Panasonic TV connected to my AV received by HDMI 2 (ARC). Single HDMI cable between the two. When i play back content that i know has a DTS sound track i cannot get the amp to receive it. It either displays PCM or dolby digital. What i really want is those DTS letter to display. It is a licensing issues with he DTS? I'm told, and have experienced that the apple TV won't support DTS. If i plug that directly into the AV amp and play back films via the plex app on that that i know has a DTS sound track i get the same. The internet tells me that the Sony STR DN1050 is capable of receiving a DTS sound track. If i try the PS4 with the plex app with a know DTS soundtrack i get the same. However some of my PS4 games have DTS audio and that works a treat. I have checked all the setting on the TV to make sure that it isn't influencing it in anyway. My AV has shed loads of setting but the A.F.D auto sound setting says that'll it'll received the best signal coming to it. What am i missing?