I am a teacher in a small Christian School in Florida, and we need an
extremely cheap PA system for the classrooms. I have very little
knowledge in audio, but I used to play with speakers and adaptors to
add speakers as a kid. The difference here is that the distance is
greater (300 feet) and they will probably need a way to easily connect
or disconect the speakers to address specific classrooms. There are 11
classrooms, but probably the hall will need a couple of speakers too.

I have been trying to search the internet for a project or more
technical information about how to make your own PA system. I would
appreciate any information about the kind of speakers I need, the kind
of cables I need, and if it is necesary to buy some kind of amplifier.
If you have an idea of how to do this, please email me and let me know.