• If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.

  • Finally, you can manage your Google Docs, uploads, and email attachments (plus Dropbox and Slack files) in one convenient place. Claim a free account, and in less than 2 minutes, Dokkio (from the makers of PBworks) can automatically organize your content for you.



This version was saved 9 years, 10 months ago View current version     Page history
Saved by Omer Asmat
on April 20, 2011 at 5:11:30 pm




A speaker is a device that converts electrical signals to sound waves. It is a transducer; a transducer is a device that converts one form of energy to another. Speaker may be referred to just one transducer or an integration of many transducers and filters.



Table of contents:

  1. History


Invention of the first Loudspeaker:


In 1867, Alexander Graham Bell constructed the first ever electrical speaker device for the purpose of building a telephone.








Later Ernst Siemens and Nicola Tesla improved upon Bell’s invention from the period of 1877 to 1881.


Horace Short patented a loudspeaker design that uses compressed-air mechanism in 1898.



Pathe and Victor Talking Machine Company were few companies that incorporated the compressed-air speakers in their players but the sound quality was poor and producing low volume sound was not possible.



In the more advanced design we use moving coil transducer, which was patented by Chester W. Rice and Edward W. Kellogg in 1924. The moving coil transducer used electromagnets as permanent magnets.



It was only in the 1930s that filters were used in the speakers to increase the level of sound pressure, frequency response and overall quality of the device output.




The Shearer Horn System for Theatres was the first speaker system of industry standard that was installed in 1937.



Comments (0)

You don't have permission to comment on this page.