REALLY NEED help, Black material behind screen??!?

Out of curiosity, why don't you want to paint it? I would think that paint would be the most economical solution since money is a factor here. Black paint covers any color very easily. You could also take some inexpensive casing moulding and frame a rectangle slightly larger than the screen leaving several inches between the inside of the casing and the screen. Then paint it black and the area between the casing and the screen black. Depending on your skills, that's a fairly easy way to add a nice finished touch and to create a nice, straight rectangle fairly easily (assuming you have a mitre saw- either manual or power). If you go with fabric I would think it would be difficult to keep the lines straight and parallel with your screen.

I don't know anything about your screen.....but I used duvetyne aka "commando cloth" behind my flat fixed mounted screen.

Here's an example:

http://www.filmtools.com/duvetyne.html

You can put either term in the search engine and shop for price.

Ron

For $30 you could pick up a roll of dark landscape fabric. It's a little porous so maybe a couple of layers.

The whole screen wall should be treated w/linacoustic and then covered with the acoustically transparent fabric. The GOM makes many different fabrics which you can use for this purpose.

I second the flat black paint idea. Works great.

Paint is the way to go.

So Josh, what did you decide to do?

Maybe, it wasn't really Josh ?