I am in the process of finishing off my basement, and plan on making it a projector theatre room. It is nicely suited to this because it is dark, it is fairly narrow and very long. It is also just being sheetrocked right now, so I can change things that need to be changed, such as adding networking cable and other cables.
My question is, I have measured and can output my projector (Proxima LS1) to a 300 inch screen. Currently I output to a 150 inch screen in my living room, and it looks excellent. I have not come across any screens for 300inches or even close to this. Currently I output right onto my flat white wall and it looks great, but was wondering if I should look into any special paints or coating for my wall for optimum viewing without a screen.