You will need to have a source for each projector. Be it usb (if the projector can play from a usb drive), DVD player, or laptop. The only way to play on three separate projectors from one source would be computer with three video ports, opening a video player program for each projector. The cables to run to all the projectors would cost far more (depending on distance) than buying three cheap DVD players. If you can specify which projector you have, it may help to determine what the best solution is.