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Saved by Omer Asmat
on April 20, 2011 at 10:44:28 pm





Table of contents:

  1. History

          1.1 Invention of the first Loudspeaker

          1.2 Further Improvements    

     2. What is a loudspeaker?

     3. Design

     4. Physics

     5. Resources




Invention of the first Loudspeaker:


In 1867, Alexander Graham Bell constructed the first ever electrical speaker device for the purpose of building a telephone. In 1877, Ernst Siemens improved upon Bell's invention and invented a more advanced electrical loudspeaker. During the period of 1867 to 1891, physicists such as Nikola Tesla  were working upon improving this idea of the loudspeaker. The research of these three physicists 'sparked' the development of the modern-era loudspeaker.



Alexander Graham Bell,  Nikola Tesla and Ernst Siemens (left to right) were key individuals who contributed to the development of the modern speaker.


Further Improvements:

In 1898, Horace Short used the design of the loudspeaker which was driven through compressed air. These designs however proved to have flaws such as poor sound quality and inability to produce sounds at a low volume. At this time, other scientists such as Oliver Lodge were experimenting with the modern design of moving coil.


What is a loudspeaker?


Brief Description:

A loudspeaker is a device which converts electricity into sound which is amplified through a device. Commonly used loudspeakers are radios and stereo systems. There are many different types of loudspeakers and they all are different in terms of producing sound frequency. A loudspeaker can also be referred to transducer which means that it converts a certain type of energy into another. In this case a loudspeaker converts electrical energy into sound energy.








Many common types of drivers today are made from lightweight diaphragm, or cone which is then connected to a rigid basket type frame. Basically an electric signal is applied to the voice coil, in which a magnetic field is created by running current through it. A mechanical force is generated by the interaction of the coil and the driver's mechanical system causing the coil to move back and forth, thereby reproducing sound. The amplifier is constantly switches the electrical signal, causing the fluctuation between a negative and positive charge in the red wire.




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