Well, if you consider a 2.2 speaker system as Dolby Atmos, then I guess it handles True-HD and DTS-HD. From what I've read, the B7P has built in decoders for Atmos and DTS X and Atmos, specifically, via the Dolby access app. I think that is for the TV speakers only. (Internal processing of Dolby True-HD and DTS-HD.) I believe if you used ARC to an AVR, then it would be DD+ - - just like everything else.
If you had more speakers (5.1.4, 7.1.4) - then the best soundtrack would be an uncompressed Bluray disc - either UHD/4K or regular Bluray with Atmos or DTS X.
But if you like the sound of the B7P, then by all means, go for it. If you do not have a separate sound system and AVR for a multi-speaker layout - - then that's one way of getting Dolby Atmos without having an AVR or all the speakers. And, you'll get Netflix Atmos (via DD+) natively through the internal speakers and possibly through ARC to an AVR. Better off angle viewing, as well.
Thanks so much for the fast response! . I’ve an Onkyo HTIB from 2010, wich since then, I use with my windows pc to obtain DTS-HD and DOLBY True-HD.
This time I need to output to my non 4K Onkyo receiver Dts-HD and True-HD, from the tv itself/without the pc. It is possible trough ARC?
And separate question for all...if you can buy the B7P for $200 bucks cheaper than the X900E, you’ll do it?
Thanks so much again