# Planning for Audio, Video & Lighting

How do we properly choose a screen size and projector for our auditoriums? It all comes down to some basic math. It begins with looking at our stage and figuring how tall a screen the room can permit. I add the stage height to the normal height of a person on top of that stage and then subtract that number from the overall ceiling height. For example: If my stage is 2 feet tall, my overall ceiling height is 16 feet, and my worship team averages 6 feet tall, then 16 feet minus 8 feet leaves 8 feet for a screen. I usually stay with a 16:9 HDTV format for screens. This gives me the remaining numbers for the screen, based on the 8 feet height. I can go online and find a calculator that will tell me that for a 96” high screen, the width would be 171” and have a diagonal of 196”. Now that I know my screen size, I can calculate the square footage of the screen. This will clue us in to how many lumens of brightness is necessary in our projector. If you plan ahead, amplifier locations can be included in your plans so that they are not exposed or sitting against a wall in the open. This can be unsightly or an inconvenience later. There is also the issue of speaker placement. You may run into the challenge of not being able to position a speaker in the best position if it is an afterthought. Things get in the way and there may not be supports to hang speakers from. The positioning of your speakers is critical.