The Purpose of Loudspeakers

Author: N.H. Crowhurst

Amplifying the currents from the microphone is not enough - we cannot hear currents! (Birds do not sit on telephone wires to listen to the conversations.)

How do we make ourselves heard?

It is the purpose of loudspeakers to convert the varying currents back into sound waves. In fact, loudspeakers may be thought of as microphones in reverse. An example of the use of an actual speaker as a microphone was given earlier, and the principles of operation of the microphones already discussed are all used in making loudspeakers.