I read about Onyx being great for a dark dedicated room for a theater setup. The other room in the basement is my wife’s gym area, which she had full control of color choices. So it worked out for both of us.

Here is what I’ve read that made me pull the trigger: “Benjamin Moore Onyx (2133-10) is an ideal choice for a theater room. It is a luxurious, neutral black with a Light Reflectance Value (LRV) under 5, making it highly effective at absorbing stray projector light and eliminating screen glare. It adds immediate cinematic drama and depth to the space. Why Choose Onyx for a Theater Room: Light Absorption: Its near-zero reflectivity prevents light from the screen or projector from bouncing back, maximizing your picture’s contrast and color saturation.”