As someone who tests home cinema products for a living, I have used countless 4K Blu-ray discs to challenge picture and sound quality on a range of different products. That includes some of the cheapest projectors we have tested (the Xgimi Vibe One, for example) and premium all-in-one sound systems such as the Focal Mu-so Hekla.
There are some discs that I turn to specifically for their unique specifications. Pan, for instance, is a pretty tedious watch, but it is mastered to a whopping 4000 nits, which makes it a great test of brightness.
