loudspeaker


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loudspeaker

or

speaker,

device used to convert electrical energy into sound. It consists essentially of a thin flexible sheet called a diaphragm that is made to vibrate by an electric signal from an amplifieramplifier,
device that accepts a varying input signal and produces an output signal that varies in the same way as the input but has a larger amplitude. The input signal may be a current, a voltage, a mechanical motion, or any other signal; the output signal is usually of the
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. The vibrations create sound waves in the air around the speaker. In a dynamic speaker, the most common kind, the diaphragm is cone-shaped and is attached to a coil of wire suspended in a magnetic field produced by a permanent magnet. A signal current in the suspended coil, called a voice coil, creates a magnetic field that interacts with the already-existing field, causing the coil and the diaphragm attached to it to vibrate. To provide a faithful reproduction of music or speech, a loudspeaker must be able to reproduce a wide range of audio frequencies (i.e., 20 Hz to 20 kHz). Since it is difficult for a single speaker to do that adequately, many quality sound systems employ speakers of three different sizes. The largest ones, or woofers, reproduce low frequencies; the medium-sized ones, or midrange speakers, reproduce middle frequencies; the smallest ones, or tweeters, reproduce high frequencies. The three sizes were traditionally contained in the same cabinet, with a pair of such speakers used for stereophonic soundstereophonic sound,
sound recorded simultaneously through two or more electronic channels. For live recordings, microphones are placed in different positions relative to the sound source.
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, but increasingly in the late 1980s and early 1990s home sound systems used smaller pairs of speakers enclosures containing only the midrange speakers and tweeters and a single woofer cabinet designed to be placed in an out-of-the-way location. This design takes avantage of the fact that the human ear is not good at determining the direction of low-frequency sound, and thus stereo perception is not adversely affected by the location of the woofer. A crossover network is a filter in a speaker system that ensures that each speaker receives only signals in the frequency range it is designed to reproduce. A properly designed enclosure can reduce unwanted resonances and extend the frequency range of a speaker system. Along with dynamic speakers, other speaker types include electrostatic and piezoelectric.

Loudspeaker

 

an electroacoustic or mechanical device for the loud reproduction of speech. music, and other sounds. Most types of loudspeakers transform electrical current or the voltage of sound frequencies into sound vibrations of the surrounding air medium with the aid of a mechanical movable system (diffuser. diaphragm). There are different types of loudspeakers. including the moving-coil. the horn. the piezoelectric. the condenser. and the magnetic. In the past pneumatic loudspeakers were also used. The direction in which a loudspeaker operates is determined by a horn (in moving-coil and pneumatic loudspeakers) and by the use of sound columns.

The most frequently used devices in broadcast receivers and sound amplification systems are moving-coil loudspeakers with a rated capacity of 0.1 to 100 watts (W) and a band of reproduced frequencies of 50 to 12.000 hertz (Hz); sound columns consisting of several diffuser loudspeakers with total rated capacity of up to 100 W and a band of reproduced frequencies of 100 to 8,000 Hz; and loudspeaker systems consisting of moving-coil and horn-type loudspeakers with a total rated capacity of up to 100 W.

REFERENCES

Dreizen. I. G. Elektroakustika i zvukovoe veshchanie. Moscow, 1961.
Dol’nik, A. G. Gromkogovoriteli. 3rd ed. Moscow-Leningrad, 1961.

What does it mean when you dream about a loudspeaker?

A loudspeaker may be the mind’s way of trying to get our attention, especially about something that we have forgotten or an action we have delayed.

loudspeaker

[′lau̇d‚spēk·ər]
(engineering acoustics)
A device that converts electrical signal energy into acoustical energy, which it radiates into a bounded space, such as a room, or into outdoor space. Also known as speaker.

loudspeaker

An electroacoustic device, used to radiate acoustic power in air, the acoustic waveform of the reproduced sound being essentially equivalent to that of the electrical input.

loudspeaker

a device for converting audio-frequency signals into the equivalent sound waves by means of a vibrating conical diaphragm

loudspeaker

A device that converts analog audio signals into the equivalent air vibrations in order to make audible sound. A loudspeaker is also a "speaker;" however, the term loudspeaker may be used to differentiate human speakers at a podium from the PA (public address) system that amplifies their speech. See speaker, Bluetooth speaker and parametric speaker.
References in periodicals archive ?
2.1.1 Global Loudspeaker Market, by Product, 2018 (US$ Mn)
The loudspeaker was used for the playing of songs and to make spot announcements asking party members to vote for Mohd Rafizi.
A cross-sectional view of the cone loudspeaker is shown in Figure 2.
The black fabric covers hover like sails in front of the speakers, and the curved wooden base lifts up the large structure from the floor, allowing the loudspeaker to fit in with the interior design anywhere in the home.
We can live in peace." "In this case, we have the high court's directions that the loudspeakers can be put up only after we permit.
Using a loudspeaker in the street to advertise a trade is an offence under Section 62 of The Control of Pollution Act 1974.
Lichfield District Council had already warned Hunt that the sounding of a loudspeaker in the street to advertise his trade as a scrap metal collector was an offence.
As per the deal, FX Entertainment will import, distribute, retail and service the entire range of loudspeakers from Triangle, France.
WHEN I read your article on loudspeaker alarms activated by smoke detectors outside our hospitals I thought it was some sort of end of year April Fool story.
"It's not just a loudspeaker; it's a whole new approach to audiophile loudspeakers, disposing with the old idea of a rectangular box," he said.
<p>Aficionados of Linn systems have been known to create the ultimate system with Klimax Kontrol by connecting Klimax DS -- a new generation of music player, Klimax 500 Solo and Klimax 500 Chakra Twin power amplifiers, and Klimax loudspeakers while in search of audio perfection.<p>Like all Linn pre-amplifiers, Klimax Kontrol features Knekt technology which means you can also enjoy music throughout your home as part of a Linn Knekt multi-room system.<p>The Klimax loudspeaker range is what Linn says is the culmination of an intensive period of acoustic analysis and development which spanned over two years.
Worldwide Computer Products News-30 October 2008-German loudspeaker brand launches in the UK(C)1995-2008 M2 COMMUNICATIONS LTD http://www.m2.com