In most classrooms, additional audio reinforcement is required for the AV system. We have found the Epson SP02 wall mounted speakers to be a great addition to a standard size classroom.
Not only are they loud and clear enough to fill a classroom space, they also feature a second audio output, meaning independent audio can be cabled allowing iPod/Mp3 players to be used without having to turn on the AV system.
30W ELPSP02 Specification Sheet