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Longman Dictionary of Contemporary English
loudspeaker
noun
EXAMPLES FROM CORPUS
▪ Because treble frequencies are directional and bass frequencies are not, standing in front of a loudspeaker cabinet always gives a brighter sound.
▪ Broadcasting via a system of street loudspeakers the radio is on the air for three hours each Sunday.
▪ But there are differences, the most obvious being the loudspeakers.
▪ Later that evening, however, loudspeaker vans cruised the town, announcing the election for Friday, the next day.
▪ Mimicking candidates who campaigned with loudspeakers, I went outside every day and gathered neighborhood children and made speeches.
▪ Only if the loudspeaker starts singing a new song will her soliciting start afresh.
▪ Similarly, there are few restrictions on temporary use of loudspeakers, such as when messages are blasted intermittently from mobile vans.
▪ So microphones and loudspeakers were installed.
The Collaborative International Dictionary
loudspeaker

loudspeaker \loudspeaker\ n. A device which converts electrical signals into sounds loud enough to be heard at a distance, usually outdoors; it is used to amplify or transmit over a distance speech from a person, who is typically speaking into a microphone. Sometimes it is used to play recorded speech or music.

Syn: speaker, speaker unit, loudspeaker system, speaker system.

Douglas Harper's Etymology Dictionary
loudspeaker

also loud-speaker, 1884, from loud (adj.) + speaker.

Wiktionary
loudspeaker

n. 1 An electromechanical transducer that converts an electrical signal into audible sound. 2 An encasing containing one or more loudspeaker devices and usually other electrical equipment such as a driver.

WordNet
loudspeaker

n. electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance [syn: speaker, speaker unit, loudspeaker system, speaker system]

Wikipedia
Loudspeaker

A loudspeaker (or loud-speaker or speaker) is an electroacoustic transducer; 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.

Speakers are typically housed in an enclosure which is often a rectangular or square box made of wood or sometimes plastic, and the enclosure plays an important role in the quality of the sound. Where high fidelity reproduction of sound is required, multiple loudspeaker transducers are often mounted in the same enclosure, each reproducing a part of the audible frequency range (picture at right). In this case the individual speakers are referred to as "drivers" and the entire unit is called a loudspeaker. Drivers made for reproducing high audio frequencies are called tweeters, those for middle frequencies are called mid-range drivers, and those for low frequencies are called woofers. Smaller loudspeakers are found in devices such as radios, televisions, portable audio players, computers, and electronic musical instruments . Larger loudspeaker systems are used for music, sound reinforcement in theatres and concerts, and in public address systems.

Loudspeaker (album)

Loudspeaker is an instrumental album by the guitarist Marty Friedman, released in 2006 in Japan, and 2007 in United States. It entered the Japanese national chart at #33. This marks the first Top 40 chart position for any of his solo albums.

The album features guest performances of Steve Vai, Kirito, John Petrucci, Jens Johansson, Mick Karn, Masaki, Ryuichi Nishida, and Billy Sheehan.

Loudspeaker (film)

Loudspeaker is a 2009 Malayalam film produced, written, and directed by Jayaraj, starring Mammootty, Sasi Kumar, Gracy Singh, Jagathy Sreekumar, Cochin Hanifa, Saleem Kumar, and KPAC Lalitha.

Loudspeaker (disambiguation)

Loudspeaker may refer to:

  • A loudspeaker, an electroacoustic transducer that converts an electrical signal into sound
  • The Loudspeaker, a 1934 American film directed by Joseph Santley
  • Loudspeaker (album), a 2006 instrumental album by the guitarist Marty Friedman
  • Loudspeakers (band), a Georgian rock band
  • Loudspeaker (film), a 2009 Malayalam Cinema directed by Jayaraj starring Mammootty

Usage examples of "loudspeaker".

Groundbugs filled the roadway, pedestrians the sidewalks, a sailor, a pilot, a raftman, a fisher, a hunter, a farmer, a whore, a secretary, a drunk about to collapse, another drunk getting belligerent at a monitor, a man gaunt and hairy and ragged who stood on a corner and shouted of some obscure salvation, endless human seething, shrilling, chattering, through engine rumble, foot shuffle, raucousness blared out of loudspeakers.

Inside the towers are the searchlights, the monitor videocams, the loudspeakers, the controls for locking the gates, the tear-gas nozzles, the long-range sprayguns.

D-112, an eight-man bunkroom, and Sam was showing him how to set the lock on the one empty locker when there was a distant call on a loudspeaker.

German Army had spoiled and ravaged the lands of Russia, we could scarcely expect to be received with such open arms as the blandishing of the trench loudspeakers sought to persuade us would be the case.

The spell of the play was not yet cast on them, the occult masked figures on the skene below, the voices of gods and doomed kings manifested by loudspeakers with terrifying intimacy even on the highest benches.

He landed and set up an ultrasensitive shotgun microphone, hooked to a powerful amplifier and loudspeaker.

At present the loudspeaker is the enemy of the creative writer, but this may not necessarily remain true when the volume and scope of broadcasting increase.

  As he listened to the countdown being announced over the loudspeakers in the VIP area, he was eager and anticipant, but not yet in awe.

The loudspeaker above the Asdic cabinet crackled urgently, the voice hurried, insistent.

Then, slapping shoulders and joking, about half of them had crowded through the door when in the passageway the loudspeaker bawled, "Now belay that last word.

Renny's voice bawled out of the loudspeaker: "That queer centipede that disappeared after clawin' up the elevator starter -- well, it showed up again.

It would take an army of priests, a water cannon filled with holy water, a loudspeaker to pronounce the benedictions.

There was a loudspeaker on top of the Buick's roof, and now it began to give off amplified boops and beeps, followed by the scratchy sounds of an old record's opening grooves, and then, blaring up and down the spectral, deserted streets of Des Moines came the sweetly droning voice of Mother Maybelle Carter, singing "Keep on the Sunny Side.

The voice emanated from the loudspeakers built into the entertainment center.

In the Enterprise ready room, the fliers listened avidly to the jocular, occasionally obscene radio exchanges pouring from the loudspeaker as the Hornet planes found the two cripples and plastered them with half-ton bomb hits.