There are some types of loudspeakers. The most known and useful of them are Digital speakers.
1861 - A simple type of electronic loudspeaker was developed by Johann Philipp Reis - a teacher at Friedrichsdorf, Germany. The speaker was crudely able to reproduce sound and just an experiment.
Alexander Graham Bell also tried to produce a speaker based on Reis's work.
he idea of the electromagnetic coil driven speaker is formulated by Werner Von Siemens, he used it with input signals of DC transients and telegraphic signals. He had no way to amplify sound to create a useful speaker, but he theorized that this could eventually be done.
Various inventors and engineers played with the idea of the electrodynamic loudspeaker but could only create rough distorted sounds. There was no way to electrically amplify the signal to create very loud sounds. The industry continued to rely on more advanced horns to create amplification.
The first prototype loudspeaker, finished in May 1921. The speaker cone is damaged. Inside the cabinet is a groundbreaking power amplification system.
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