Thank you coreelek community
My story is, LG C2 simply won't do anything DTS because they are too poor to buy the license for their customers. Also its DLNA client will downmix trueHD to some 6.1 strangeness, even if set to passthrough. It also gets picky about what format the subtitles are available. Never had an issue with the picture though, all HDR/DV plays fine. On the other hand Kodi on the xbox series x, never had issues with audio passthrough but occasionally likes to fuck up the image with DV. So I got tired of this and started looking into nvidia shield 2019 pro. But I like to tinker so I found coreelec and the AM6B+, which took forever to show up from aliexpress and go through customs etc.
So I read a few comments here and in the coreelec forums, i used this as a guide https://discourse.coreelec.org/t/guide-s922x-j-ugoos-am6b-coreelec-ng-installation-and-faqs/51231 but with the latest -ng build from here instead https://github.com/pannal/CoreELEC/releases/tag/T4a
overall pretty easy install on an sd card, reboot on recovery and done. Audio passthrough works just fine and while I haven't done many DV tests yet, seems to chew on everything I've added. My setup is very simple, minidlna running as an app in my truenas does the majority of streaming.
I'll experiment with skins next, I would like something that would look like a library.
Overall very impressed with coreelek and how well it works with the am6b+