Megaphones: 5 Fast Facts

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Fact #1. There's a bit of controversy surrounding the actual invention of the megaphone as we know it today. Early designs were as much for hearing from great distances as they were for projecting one's voice. They were like binoculars, or telescopes, but for the ears.
Fact #2. You might remember seeing images of Beethoven operating a small, coiled hearing device. It looked like a miniature version of the speaker on an old record player. This is because he went progressively deaf as he aged. These early hearing aides were smaller versions of the first megaphones. They were meant to send as well as receive. This was made possible by the fact that they weren't electric. It was a simple trick of acoustic physics.
Fact #3. The first developments of acoustic models reach back into the 17th century. Thomas Edison came along some 200 years later to advance the design. In the 1970s, they went electric. Since then, electric models have come to dominance in every arena save the cheer-leading floor. They've gotten more powerful with time.
Fact #4. At first glance, it might be hard to see any real difference between one unit and the next. They're all shaped basically the same, with a little removable handheld microphone, a long bell, and a handle. Similarities, while reassuring to a certain extent, can make a product decision more difficult for lack of real comparability.
Fact #5. Try to think about what you'll be using your megaphone to accomplish. Are you rallying fellow students in a crowded and boisterous gymnasium? In noisy, crowded areas, you're going to want a lot of power and coverage. Think of every other object in space as a potential impediment to your sound waves. Every fellow student, every colorful sign or well-made banner will dampen your efforts. You want a powerful driver and a big cone.