Any way that you could check this out on the X700 and UB820,
This morning I discovered that if I disable 24p output on the X700, the black levels during Dolby Vision content from a disc are WAY darker. I was watch the 4K UHD of the LOTR:FOTR and at during the opening sequence there are a number of continues full black screens that appeared very much black. When I engaged the 24p, again the black levels were elevated much higher. Forcing HDR10 was still the best, as far as reproducing absolute black.
Also, for some reason, streaming Dolby Vision content with the X700 Netflix app, the black levels were noticeably better on full screen black. Netflix Dolby Vision content with 24p enabled full screen black scenes matched 4K UHD full screen black levels when the discs were played with 24p disabled. Netflix Dolby Vision content with 24p disabled had perfect full screen blacks.
Yes I can try disabling 24p on the 820 to see if that makes a difference.
We just finished watching LOTR trilogy. It was so dang good wasn’t it? The Atmos mix on those movies is DEMO worthy! Anyways yes I had noticed those spots in the openings of FOTR as well. I will see if disabling 24p makes a difference.
Also I tried playing a couple Dolby Vision demos on my USB drive through the TV’s USB input and 50 still had the elevated solid black screen just like on HDMI sources so I know you said you noticed a difference with those slides between HDMI & USB but they seem to be the same to me.
Also pausing at some different dark scenes last night in Return of the King there was just so many times where having it on 50 seemed wrong and 49 seemed how it was meant to be. Like 50 would have weird halo’s or globs or grey and 49 fixed them.
As far as Netflix I remember stranger things having some issues where I noticed the elevated black and changing to 49 fixed that. My findings so far have found the error to be consistent with Dolby Vision across all inputs and sources where 50 doesn’t seem to be right and 49 seems much closer to black.
Also, I’m sure the calibration guys wouldn’t recommend this but I like to put the gamma at 1 instead of 0 for Dolby Vision and and HDR10. Helps it pop just a lot more over SDR. Also putting it to 1 helps bring back a bit of brightness lost in dark scenes from taking black from 50 to 49. Also when I was using the x800m2 before getting the 820 I would have to put the gamma at 2 since the Sony player had dim DV output. The 820 DV output looks amazing though and with the gamma back at 1 it’s perfect for me!