Humanities ? History & Culture History of the Loudspeaker Primitive Loudspeakers Were Created in the Late 1800s Share Flipboard Email Print ?Les Chatfield/Creative Commons History & Culture Inventions Famous Inventions Famous Inventors Patents & Trademarks Invention Timelines Computers & The Internet American History African American History African History Ancient History and Culture Asian History European History Genealogy Latin American History Medieval & Renaissance History Military History The 20th Century Women's History View More By Mary Bellis Inventions Expert Mary Bellis covered inventions and inventors for ThoughtCo for 18 years. She is known for her independent films and documentaries, including one about Alexander Graham Bell. our editorial process Mary Bellis Updated February 28, 2018 The very first form of loudspeaker came to be when telephone?systems were developed in the late 1800s. But it was in 1912 that loudspeakers really became practical -- due in part to electronic amplification by a?vacuum tube. By the 1920s, they were used in radios, phonographs,?public address systems?and theater sound systems for?talking motion pictures. What is a Loudspeaker? By definition, a loudspeaker?is an?electroacoustic?transducer that converts an electrical?audio signal?into a corresponding?sound. The most common type of loudspeaker today is the?dynamic speaker. It was invented in 1925 by?Edward W. Kellogg?and Chester W. Rice. The dynamic speaker operates on the same basic principle as a?dynamic microphone, except in reverse to produce sound from an electrical signal. Smaller loudspeakers are found in everything from radios and televisions to portable audio players,?computers and?electronic musical instruments. Larger loudspeaker systems are used for music,?sound reinforcement?in theaters and concerts?and in?public address systems. First Loudspeakers Installed in Telephones Johann Philipp Reis?installed an electric loudspeaker in his??telephone?in 1861 and?it could reproduce clear tones as well as reproduce muffled speech.?Alexander Graham Bell?patented his first electric loudspeaker capable of reproducing intelligible speech?in 1876 as part of his telephone. Ernst Siemens improved upon it the following year. In 1898, Horace Short earned a patent for a loudspeaker driven by compressed air. A few companies?produced record players using compressed-air loudspeakers, but these designs had poor sound quality and could not reproduce sound at a low volume. Dynamic Speakers Becomes the Standard The first practical moving-coil (dynamic) loudspeakers were made by Peter L. Jensen?and?Edwin Pridham?in 1915 in?Napa, California. Like previous loudspeakers, theirs used horns to amplify the sound produced by a small diaphragm. The problem, however, was that Jensen could not get a patent. So they changed their target market to radios and?public address systems?and named their product?Magnavox. The moving-coil technology commonly used today in speakers was patented in 1924 by?Chester W. Rice?and?Edward W. Kellogg.? In the 1930s, loudspeaker manufacturers were able to boost?frequency response?and?sound pressure?level.?In 1937, the first film industry-standard loudspeaker system was introduced by?Metro-Goldwyn-Mayer?. A very large two-way?public address?system was mounted on a tower in Flushing Meadows at the?1939 New York World's Fair.? Altec Lansing?introduced the?604?loudspeaker in 1943 and?his?"Voice of the Theatre" loudspeaker system was sold beginning in 1945. It offered better coherence and clarity at the high output levels necessary for use in movie theaters.The Academy of Motion Picture Arts and Sciences immediately began testing its sonic characteristics and they made it the?film house?industry standard in 1955. In 1954,?Edgar Villchur?created the?acoustic suspension?principle of loudspeaker design in?Cambridge, Massachusetts. This design delivered?better bass response and was important during the transition to stereo recording and reproduction. He and his partner?Henry Kloss?formed the?Acoustic Research??company to manufacture and market speaker systems using this principle.?