Room Acoustics: Where to place the squares?

I still want to know more about the squares, as in size, thickness, material used, and how many. Who makes them and what model would do.

 Thanks Eric,

 Good choices you have there. I want to be interested in them, but it ain't gonna happen. My question was aimed more toward what info the OP has about what he has chosen to use. We know nothing and can assume little.

 For a while, I worked for the local college repairing some of their abused machinery. Usually the ticket would read "broke" or "doesn't work". What we have here is a lack of communication. One of my favorite movie lines.