A loudspeaker (or loud-speaker or speaker) is an electroacoustic transducer; a device which converts an electrical audio signal into a corresponding sound. The first primitive loudspeakers were invented during the development of telephone systems in the late 1800s, but electronic amplification by vacuum tube beginning around 1912 made loudspeakers truly practical. By the 1920s they were used in radios, phonographs, public address systems and theatre sound systems for talking motion pictures.
The most widely used type of speaker today is the dynamic speaker, invented in 1925 by Edward W. Kellogg and Chester W. Rice. The dynamic speaker operates on the same basic principle as a dynamic microphone, but in reverse, to produce sound from an electrical signal. When an alternating current electrical audio signal is applied to its voice coil, a coil of wire suspended in a circular gap between the poles of a permanent magnet, the coil is forced to move rapidly back and forth due to Faraday's law of induction, which causes a diaphragm (usually conically shaped) attached to the coil to move back and forth, pushing on the air to create sound waves. Besides this most common method, there are several alternative technologies that can be used to convert an electrical signal into sound. The sound source (e.g., a sound recording or a microphone) must be amplified with an amplifier before the signal is sent to the speaker.
Loudspeakers (stylised as LOUDspeakers) is a Georgian rock band formed in 2009.
Loudspeakers formed in 2009 as an alternative rock band. In that year, the band recorded their first song in the kote kalandadze studio. In January 2010 they played their songs in Tbilisi rock club. In 2010 otar gurgenidze left the band, Zura Mchedlishvili replaced him. The same time Zura left and Dato Tsomaia joined the band.
The first important success of this band was when they played in Tbilisi Altervision-Newcomers and became a winner. In 2011 the band had the first solo concert in Magti Club. After this concert Aleko Dolidze left the band. It was an important loss but LoudSpeakers didn’t stop their work, Sandro Tsiklauri joined the band.
By today LoudSpeakers have played in festivals in Georgia and other countries around the world. For example, Tbilisi Open Air and Arenal Sound Festival.
The band realised their debut album Lighthouse on 4 March 2015.