I don't know I think it depends on the teacher. Granted I majored in Music and took several business courses so audio systems were kinda necessary as well as PC's. But you if you meant a PA system then yeah I can't recall that ever working for a teacher.
I was always the tech guy for my teachers. I did it so often, whenever there was a problem in class, my classmates just stared at me until I stood up and did something.
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