I am using a AmPro projector. It has 7" crt's. My room is 25' X 13' The first row is about 6' from the screen. My screen size is 8'X6'. There are three rows in my theater room each rising about 12". The projector is approx. 13' from the screen. P.S. any suggestions to another problem that I am having. After the projector has been running aprox. 1/2 hour a shadow appears on the top of the screen. It comes and goes with scene changes. It is very irregular in size and timing. Anyone have any suggestions?