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Consumer Electronics by S. P. Bali

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BASIC LOUDSPEAKER

When broadcasting first began, the only available devices for converting sound energy into electrical energy, and vice versa, were those used in the ordinary telephone. Microphones were usually of the carbon type. The hearing device, or telephone receiver, was a simple electromagnet energised by electrical signals. These signals caused a thin sheet of magnetic material (the telephone diaphragm) to vibrate in synchronism. Wearing headphones, however, was not exactly conducive to listening pleasure, besides the reproduction wasn't of the best quality. So, engineers started to search for some sort of hearing device that could be separated from the head of the listener and still supply enough volume to make listening easy. Hi-fi ...

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