Xbox Series X 4K Blu-ray Player Cannot Output True Black (Objective Proof)

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Published May 29, 2025

*Update 20 Nov 2020:* After investigating the problem we pointed out in this video, Microsoft has identified & fixed the issue of black floor being elevated during Blu-ray playback on the Xbox Series X, and will roll out a public update shortly.

We verified that the 4K Blu-ray player on the Xbox Series X cannot render true black, leading to incorrectly elevated black level.

Using the pixel value checker function on a Canon DP-V2411 4K reference monitor, we found that the Blu-ray app on the Xbox Series X would always display a black video signal as a very very dark shade of grey with RGB subpixel values of 11, 11, 11, resulting in a minimum luminance level (MLL) of 0.00243 cd/m2 instead of 0 cd/m2.

We also compared the results from a Panasonic UB9000 4K Blu-ray player, as well as an Xbox One X, both of which were capable of producing true 0 cd/m2 blacks.

Due to this issue, not to mention the lack of support for Dolby Vision, HDR10+ and 3D Blu-rays, we currently do not recommend using the Xbox Series X for high-quality 4K Ultra HD Blu-ray playback.

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