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Index Loudspeaker

A loudspeaker (or loud-speaker or speaker) is an electroacoustic transducer; which converts an electrical audio signal into a corresponding sound. [1]

213 relations: Absorption (acoustics), Acoustic impedance, Acoustic Research, Acoustic resonance, Acoustic suspension, Alarm clock, Alexander Graham Bell, Aliasing, Alnico, Altec Lansing, Altec Lansing Duplex, Aluminium, Analog-to-digital converter, Anechoic chamber, Asphalt, Association of Loudspeaker Manufacturing & Acoustics International, Audio crossover, Audio power, Audio power amplifier, Audio signal, Audiophile, Background music, Bakelite, Bamboo, Bandwidth extension, Bass reflex, Bell Labs, Bessel function, Binding post, Bit, Bose Corporation, Cabasse (company), Cambridge, Massachusetts, Capacitance, Capacitor, Carbon fiber reinforced polymer, Carbon nanotube, Casting (metalworking), Ceramic, Charles Algernon Parsons, Chester Williams Rice, Compression driver, Computer, Computer speakers, Copper, Damping factor, Decibel, Diaphragm (acoustics), Diffraction, Digital speaker, ..., Directional sound, Distortion, Douglas Shearer, Dust cap, Dynamic range compression, Echo suppression and cancellation, Edgar Villchur, Edward W. Kellogg, Electric current, Electric field, Electric power, Electrical impedance, Electrical polarity, Electrical reactance, Electrical resistance and conductance, Electromagnet, Electronic musical instrument, Electronics, Electrostatic loudspeaker, Faraday's law of induction, FeONIC, Ferrite (magnet), Field coil loudspeaker, Flushing Meadows–Corona Park, Foam, Frequency response, Full-range speaker, Genelec, Glass fiber, Glass wool, Guitar speaker, Headphones, Helium, Hemp, Henry Kloss, High fidelity, High-end audio, Horn (acoustic), Horn loudspeaker, Impedance matching, Inductance, Inductor, Infrasound, Ingeniøren, Instrument amplifier, Intermodulation, Isobaric loudspeaker, James Bullough Lansing, Jay Pritzker Pavilion, Johann Philipp Reis, John Kenneth Hilliard, John M. Eargle, Josef Anton Hofmann, KEF, Kevlar, KLH (company), Kyocera, Lafayette Radio Electronics, LARES, Lead, Lincoln Walsh, List of loudspeaker manufacturers, Long Range Acoustic Device, Lorentz force, Loudness, Loudspeaker, Loudspeaker acoustics, Loudspeaker enclosure, Loudspeaker measurement, Machine press, Magnavox, Magnet, Magnetic field, Magnetostriction, Mass, Megaphone, Metro-Goldwyn-Mayer, Microphone, Mid-range speaker, Movie theater, Moving iron speaker, MP3, Music centre, Napa, California, Natural rubber, Neodymium, Nitrous oxide, NTi Audio, OLED, Oliver Lodge, Optical disc, Oskar Heil, Ozone, Parabolic loudspeaker, Pathé, Peter L. Jensen, Phase (waves), Phase plug, Phonograph, Pioneer Corporation, Planephones, Plasma (physics), Plasma speaker, Plasmatronics, Power supply, Powered speakers, Public address system, Radio, Radio frequency, Radio receiver, Rare-earth magnet, Resistor, Resonance, Roll-off, Room modes, Rotary woofer, Rudy Bozak, Rule of thumb, Samarium–cobalt magnet, Sampling (signal processing), Sensitivity (electronics), Silver, Sonar, Sound, Sound from ultrasound, Sound power, Sound pressure, Sound recording and reproduction, Sound reinforcement system, Soundbar, Speaker driver, Speaker stands, Speaker wire, Speakerphone, Speakon connector, Speech, Standing wave, Studio monitor, Styrofoam, Subwoofer, Super tweeter, Surround sound, Tannoy, Telephone, Television, Thiele/Small parameters, Thomas Edison, THX, Timbre, Trade-off, Transducer, Tweeter, Ultrasound, Victor Talking Machine Company, Viscoelasticity, Voice coil, Walter H. Schottky, Watch, Werner von Siemens, Western Electric, Wireless speaker, Woofer, 1939 New York World's Fair. Expand index (163 more) »

Absorption (acoustics)

Acoustic absorption refers to the process by which a material, structure, or object takes in sound energy when sound waves are encountered, as opposed to reflecting the energy.

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Acoustic impedance

Acoustic impedance and specific acoustic impedance are measures of the opposition that a system presents to the acoustic flow resulting of an acoustic pressure applied to the system.

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Acoustic Research

Acoustic Research was a Cambridge, Massachusetts-based company that manufactured high-end audio equipment.

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Acoustic resonance

Acoustic resonance is a phenomenon where acoustic systems amplify sound waves whose frequency matches one of its own natural frequencies of vibration (its resonance frequencies).

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Acoustic suspension

Acoustic suspension (air suspension or sealed box) is a type of loudspeaker speaker enclosure design which uses one or more loudspeaker drivers mounted in a sealed box or cabinet.

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Alarm clock

An alarm clock (or sometimes just an alarm) is a clock that is designed to alert an individual or group of individuals at specified time.

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Alexander Graham Bell

Alexander Graham Bell (March 3, 1847 – August 2, 1922) was a Scottish-born scientist, inventor, engineer, and innovator who is credited with inventing and patenting the first practical telephone.

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In signal processing and related disciplines, aliasing is an effect that causes different signals to become indistinguishable (or aliases of one another) when sampled.

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Alnico is an acronym referring to a family of iron alloys which in addition to iron are composed primarily of aluminium (Al), nickel (Ni) and cobalt (Co), hence al-ni-co.

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Altec Lansing

Altec Lansing is an American audio electronics company founded in 1927.

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Altec Lansing Duplex

Duplex was the trade name given by Altec Lansing to its line of coaxial loudspeakers, beginning with the first model 601 in 1943.

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Aluminium or aluminum is a chemical element with symbol Al and atomic number 13.

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Analog-to-digital converter

In electronics, an analog-to-digital converter (ADC, A/D, or A-to-D) is a system that converts an analog signal, such as a sound picked up by a microphone or light entering a digital camera, into a digital signal.

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Anechoic chamber

An anechoic chamber (an-echoic meaning "non-reflective, non-echoing, echo-free") is a room designed to completely absorb reflections of either sound or electromagnetic waves.

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Asphalt, also known as bitumen, is a sticky, black, and highly viscous liquid or semi-solid form of petroleum.

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Association of Loudspeaker Manufacturing & Acoustics International

The Association of Loudspeaker Manufacturing & Acoustics International (ALMA International) is a not-for-profit trade association open to companies that design, manufacture, sell and/or test loudspeakers, loudspeaker components, and loudspeaker systems and electroacoustic devices and equipment.

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Audio crossover

Audio crossovers are a type of electronic filter circuitry used in a range of audio applications, to split up an audio signal into two or more frequency ranges, so that the signals can be sent to drivers that are designed for different frequency ranges.

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Audio power

Audio power is the electrical power transferred from an audio amplifier to a loudspeaker, measured in watts.

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Audio power amplifier

An audio power amplifier (or power amp) is an electronic amplifier that reproduces low-power electronic audio signals such as the signal from radio receiver or electric guitar pickup at a level that is strong enough for driving (or powering) loudspeakers or headphones.

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Audio signal

An audio signal is a representation of sound, typically as an electrical voltage for analog signals and a binary number for digital signals.

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An audiophile is a person who is enthusiastic about high-fidelity sound reproduction.

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Background music

Background music refers to the various styles of music or soundscapes primarily intended to be passively listened to.

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Bakelite (sometimes spelled Baekelite), or polyoxybenzylmethylenglycolanhydride, is the first plastic made from synthetic components.

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The bamboos are evergreen perennial flowering plants in the subfamily Bambusoideae of the grass family Poaceae.

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Bandwidth extension

Bandwidth extension of signal is defined as the deliberate process of expanding the frequency range (bandwidth) of a signal in which it contains an appreciable and useful content, and/or the frequency range in which its effects are such.

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Bass reflex

A bass reflex system (also known as a ported, vented box or reflex port) is a type of loudspeaker enclosure that uses a port (hole) or vent cut into the cabinet and a section of tubing or pipe affixed to the port.

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Bell Labs

Nokia Bell Labs (formerly named AT&T Bell Laboratories, Bell Telephone Laboratories and Bell Labs) is an American research and scientific development company, owned by Finnish company Nokia.

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Bessel function

Bessel functions, first defined by the mathematician Daniel Bernoulli and then generalized by Friedrich Bessel, are the canonical solutions of Bessel's differential equation for an arbitrary complex number, the order of the Bessel function.

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Binding post

A binding post is a connector commonly used on electronic test equipment to terminate (attach) a single wire or test lead.

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The bit (a portmanteau of binary digit) is a basic unit of information used in computing and digital communications.

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Bose Corporation

Bose Corporation is a privately held American corporation, based in Framingham, Massachusetts, that designs, develops and sells audio equipment.

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Cabasse (company)

Cabasse is a French audio manufacturer founded by Georges Cabasse in 1950.

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Cambridge, Massachusetts

Cambridge is a city in Middlesex County, Massachusetts, and part of the Boston metropolitan area.

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Capacitance is the ratio of the change in an electric charge in a system to the corresponding change in its electric potential.

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A capacitor is a passive two-terminal electrical component that stores potential energy in an electric field.

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Carbon fiber reinforced polymer

Carbon fiber reinforced polymer, carbon fiber reinforced plastic or carbon fiber reinforced thermoplastic (CFRP, CRP, CFRTP or often simply carbon fiber, carbon composite or even carbon), is an extremely strong and light fiber-reinforced plastic which contains carbon fibers.

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Carbon nanotube

Carbon nanotubes (CNTs) are allotropes of carbon with a cylindrical nanostructure.

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Casting (metalworking)

In metalworking and jewellery making, casting is a process in which a liquid metal is somehow delivered into a mold (it is usually delivered by a crucible) that contains a hollow shape (i.e., a 3-dimensional negative image) of the intended shape.

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A ceramic is a non-metallic solid material comprising an inorganic compound of metal, non-metal or metalloid atoms primarily held in ionic and covalent bonds.

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Charles Algernon Parsons

Sir Charles Algernon Parsons, (13 June 1854 – 11 February 1931), the son of a member of the Irish peerage,http://www.tcd.ie/Secretary/FellowsScholars/discourses/discourses/1968_Lord%20Rosse%20on%20W.%20Parsons.pdf was an Anglo-Irish engineer, best known for his invention of the compound steam turbine, and as the namesake of C. A. Parsons and Company.

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Chester Williams Rice

Chester Williams Rice (December 16, 1888 – 1951) was an electrical engineer who was the joint inventor in 1925 of the moving coil loudspeaker along with Edward W. Kellogg.

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Compression driver

A compression driver is a small specialized diaphragm loudspeaker which generates the sound in a horn loudspeaker.

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A computer is a device that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming.

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Computer speakers

Computer speakers, or multimedia speakers, are speakers sold for use with computers, although usually capable of other audio uses, e.g. for an MP3 player.

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Copper is a chemical element with symbol Cu (from cuprum) and atomic number 29.

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Damping factor

In an audio system, the damping factor gives the ratio of the rated impedance of the loudspeaker to the source impedance.

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The decibel (symbol: dB) is a unit of measurement used to express the ratio of one value of a physical property to another on a logarithmic scale.

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Diaphragm (acoustics)

In the field of acoustics, a diaphragm is a transducer intended to inter-convert mechanical vibrations to sounds, or vice versa.

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--> Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit.

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Digital speaker

Digital speakers or Digital Sound Reconstruction (DSR) system are a form of loudspeaker technology.

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Directional sound

Directional Sound refers to the notion of using various devices to create fields of sound which spread less than most (small) traditional loudspeakers.

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Distortion is the alteration of the original shape (or other characteristic) of something.

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Douglas Shearer

Douglas G. Shearer (November 17, 1899 – January 5, 1971) was a Canadian American pioneering sound designer and recording director who played a key role in the advancement of sound technology for motion pictures.

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Dust cap

The dust cap (also known as dust dome, or dome) is a gently curved dome mounted either in concave or convex orientation over the central hole of most loudspeaker diaphragms.

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Dynamic range compression

Dynamic range compression (DRC) or simply compression is an audio signal processing operation that reduces the volume of loud sounds or amplifies quiet sounds thus reducing or compressing an audio signal's dynamic range.

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Echo suppression and cancellation

Echo suppression and echo cancellation are methods used in telephony to improve voice quality by preventing echo from being created or removing it after it is already present.

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Edgar Villchur

Edgar Marion Villchur (28 May 1917 – 17 October 2011) was an American inventor, educator, and writer widely known for his 1954 invention of the acoustic suspension loudspeaker which revolutionized the field of high-fidelity equipment.

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Edward W. Kellogg

Edward Washburn Kellogg (20 February 1883 – 29 May 1960).

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Electric current

An electric current is a flow of electric charge.

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Electric field

An electric field is a vector field surrounding an electric charge that exerts force on other charges, attracting or repelling them.

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Electric power

Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit.

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Electrical impedance

Electrical impedance is the measure of the opposition that a circuit presents to a current when a voltage is applied.

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Electrical polarity

Electrical polarity is a term used throughout industries and fields that involve electricity.

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Electrical reactance

In electrical and electronic systems, reactance is the opposition of a circuit element to a change in current or voltage, due to that element's inductance or capacitance.

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Electrical resistance and conductance

The electrical resistance of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor.

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An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.

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Electronic musical instrument

An electronic musical instrument is a musical instrument that produces sound using electronic circuitry.

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Electronics is the discipline dealing with the development and application of devices and systems involving the flow of electrons in a vacuum, in gaseous media, and in semiconductors.

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Electrostatic loudspeaker

An electrostatic loudspeaker (ESL) is a loudspeaker design in which sound is generated by the force exerted on a membrane suspended in an electrostatic field.

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Faraday's law of induction

Faraday's law of induction is a basic law of electromagnetism predicting how a magnetic field will interact with an electric circuit to produce an electromotive force (EMF)—a phenomenon called electromagnetic induction.

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Feonic is a commercial company specialising in the design and development of magnetostrictive audio products as a spin-off from Hull University.

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Ferrite (magnet)

A ferrite is a ceramic material made by mixing and firing large proportions iron(III) oxide (Fe2O3, rust) blended with small proportions of one or more additional metallic elements, such as barium, manganese, nickel, and zinc.

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Field coil loudspeaker

A field coil loudspeaker is a dynamic loudspeaker in which the field is produced by an electromagnet rather than by a permanent magnet.

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Flushing Meadows–Corona Park

Flushing Meadows–Corona Park, often referred to as Flushing Meadows Park, or simply Flushing Meadows, is a public park in New York City.

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Foam is a substance formed by trapping pockets of gas in a liquid or solid.

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Frequency response

Frequency response is the quantitative measure of the output spectrum of a system or device in response to a stimulus, and is used to characterize the dynamics of the system.

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Full-range speaker

A full-range loudspeaker drive unit is defined as a driver which reproduces as much of the audible frequency range as possible, within the limitations imposed by the physical constraints of a specific design.

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Genelec Oy is a manufacturer of active loudspeaker systems based in Iisalmi, Finland.

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Glass fiber

Glass fiber (or glass fibre) is a material consisting of numerous extremely fine fibers of glass.

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Glass wool

Glass wool is an insulating material made from fibres of glass arranged using a binder into a texture similar to wool.

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Guitar speaker

A guitar speaker is a loudspeaker – specifically the driver (transducer) part – designed for use in a combination guitar amplifier (in which a loudspeaker and an amplifier are installed in a wooden cabinet) of an electric guitar, or for use in a guitar speaker cabinet.

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Headphones (or head-phones in the early days of telephony and radio) are a pair of small loudspeaker drivers worn on or around the head over a user's ears.

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Helium (from lit) is a chemical element with symbol He and atomic number 2.

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Hemp, or industrial hemp (from Old English hænep), typically found in the northern hemisphere, is a variety of the Cannabis sativa plant species that is grown specifically for the industrial uses of its derived products.

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Henry Kloss

Henry Kloss (February 21, 1929, January 31, 2002) was a prominent American audio engineer and entrepreneur who helped advance high fidelity loudspeaker and radio receiver technology beginning in the 1950s.

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High fidelity

High fidelity (often shortened to hi-fi or hifi) is a term used by listeners, audiophiles and home audio enthusiasts to refer to high-quality reproduction of sound.

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High-end audio

High-end audio is a class of consumer home audio equipment marketed to audiophiles on the basis of high price or quality, and esoteric or novel sound reproduction technologies.

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Horn (acoustic)

An acoustic horn or waveguide is a tapered sound guide designed to provide an acoustic impedance match between a sound source and free air.

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Horn loudspeaker

A horn loudspeaker is a loudspeaker or loudspeaker element which uses an acoustic horn to increase the overall efficiency of the driving element(s).

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Impedance matching

In electronics, impedance matching is the practice of designing the input impedance of an electrical load or the output impedance of its corresponding signal source to maximize the power transfer or minimize signal reflection from the load.

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In electromagnetism and electronics, inductance is the property of an electrical conductor by which a change in electric current through it induces an electromotive force (voltage) in the conductor.

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An inductor, also called a coil, choke or reactor, is a passive two-terminal electrical component that stores energy in a magnetic field when electric current flows through it.

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Infrasound, sometimes referred to as low-frequency sound, is sound that is lower in frequency than 20 Hz or cycles per second, the "normal" limit of human hearing.

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Ingeniøren (full name: Nyhedsmagasinet Ingeniøren, literally The News Magazine "The Engineer") is a Danish weekly newspaper specialising in engineering topics.

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Instrument amplifier

An instrument amplifier is an electronic device that converts the often barely audible or purely electronic signal of a musical instrument into an audible sound.

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Intermodulation (IM) or intermodulation distortion (IMD) is the amplitude modulation of signals containing two or more different frequencies, caused by nonlinearities in a system.

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Isobaric loudspeaker

The Isobaric loudspeaker configuration was first introduced by Harry F. Olson in the early 1950s, and refers to systems in which two or more identical woofers (bass drivers) operate simultaneously, with a common body of enclosed air adjoining one side of each diaphragm.

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James Bullough Lansing

James Bullough Lansing (born James Martini, January 14, 1902 – September 24, 1949) was a pioneering American audio engineer and loudspeaker designer who was most notable for establishing two audio companies that bear his name, Altec Lansing and JBL, the letter taken from his initials, JBL.

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Jay Pritzker Pavilion

Jay Pritzker Pavilion, also known as Pritzker Pavilion or Pritzker Music Pavilion, is a bandshell in Millennium Park in the Loop community area of Chicago in Cook County, Illinois, United States.

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Johann Philipp Reis

Johann Philipp Reis (January 7, 1834 – January 14, 1874) was a self-taught German scientist and inventor.

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John Kenneth Hilliard

John Kenneth Hilliard (October 1901 – March 21, 1989) was an American acoustical and electrical engineer who pioneered a number of important loudspeaker concepts and designs.

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John M. Eargle

John Morgan Eargle (6 January 1931 in Tulsa, Oklahoma – 9 May 2007 in Hollywood, California) was an Oscar and Grammy-winning audio engineer and a musician (piano and church and theater organ).

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Josef Anton Hofmann

Josef Anton Hofmann (J.A. Hofmann, 22 July 1924-12 November 2010) was a speaker system designer.

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KEF is a British loudspeaker manufacturer with international distribution.

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Kevlar is a heat-resistant and strong synthetic fiber, related to other aramids such as Nomex and Technora.

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KLH (company)

KLH is an audio company founded in 1957 as KLH Research and Development Corporation in Cambridge, Massachusetts, United States, by Henry Kloss, Malcolm S. Low, and Josef Anton Hofmann originally to produce loudspeakers.

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() is a Japanese multinational ceramics and electronics manufacturer headquartered in Kyoto, Japan.

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Lafayette Radio Electronics

Lafayette Radio Electronics Corporation was an American radio and electronics manufacturer and retailer from approximately 1931 to 1981.

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LARES is an electronic sound enhancement system that uses microprocessors to control multiple loudspeakers and microphones placed around a performance space for the purpose of providing active acoustic treatment.

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Lead is a chemical element with symbol Pb (from the Latin plumbum) and atomic number 82.

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Lincoln Walsh

Lincoln Walsh (November 3, 1903 – November 17, 1971) was an engineer and inventor.

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List of loudspeaker manufacturers

This is a list of notable manufacturers of loudspeakers.

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Long Range Acoustic Device

The Long Range Acoustic Device (LRAD) is an acoustic hailing device developed by LRAD Corporation to send messages and warning tones over longer distances or at higher volume than normal loudspeakers.

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Lorentz force

In physics (particularly in electromagnetism) the Lorentz force is the combination of electric and magnetic force on a point charge due to electromagnetic fields.

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In acoustics, loudness is the subjective perception of sound pressure.

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A loudspeaker (or loud-speaker or speaker) is an electroacoustic transducer; which converts an electrical audio signal into a corresponding sound.

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Loudspeaker acoustics

Loudspeaker acoustics is a subfield of acoustical engineering concerned with the reproduction of sound and the parameters involved in doing so in actual equipment.

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Loudspeaker enclosure

A loudspeaker enclosure or loudspeaker cabinet is an enclosure (often box-shaped) in which speaker drivers (e.g., loudspeakers and tweeters) and associated electronic hardware, such as crossover circuits and, in some cases, power amplifiers, are mounted.

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Loudspeaker measurement

Loudspeaker measurement is the practice of determining the behavior of loudspeakers by measuring various aspects of performance.

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Machine press

A forming press, commonly shortened to press, is a machine tool that changes the shape of a workpiece by the application of pressure.

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Magnavox (Latin for "great voice") (stylized as MAGNAVOX) is an American electronics company founded in the United States.

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A magnet is a material or object that produces a magnetic field.

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Magnetic field

A magnetic field is a vector field that describes the magnetic influence of electrical currents and magnetized materials.

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Magnetostriction (cf. electrostriction) is a property of ferromagnetic materials that causes them to change their shape or dimensions during the process of magnetization.

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Mass is both a property of a physical body and a measure of its resistance to acceleration (a change in its state of motion) when a net force is applied.

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A megaphone, speaking-trumpet, bullhorn, blowhorn, or loudhailer is usually a portable or hand-held, cone-shaped acoustic horn used to amplify a person’s voice or other sounds and direct it in a given direction.

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Metro-Goldwyn-Mayer Studios Inc. (initialized as MGM or hyphenated as M-G-M, also known as Metro-Goldwyn-Mayer Pictures, Metro-Goldwyn-Mayer or simply Metro, and for a former interval known as Metro-Goldwyn-Mayer/United Artists, or MGM/UA) is an American media company, involved primarily in the production and distribution of feature films and television programs.

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A microphone, colloquially nicknamed mic or mike, is a transducer that converts sound into an electrical signal.

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Mid-range speaker

A mid-range speaker is a loudspeaker driver that reproduces sound in the frequency range from 250 to 2000 Hz.

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Movie theater

A movie theater/theatre (American English), cinema (British English) or cinema hall (Indian English) is a building that contains an auditorium for viewing films (also called movies) for entertainment.

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Moving iron speaker

Moving iron speaker Moving iron sounder The moving iron speaker was the earliest type of electric loudspeaker.

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MP3 (formally MPEG-1 Audio Layer III or MPEG-2 Audio Layer III) is an audio coding format for digital audio.

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Music centre

A music centre (or center) is a type of integrated audio system for home use, used to play from a variety of media.

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Napa, California

Napa is the largest city and the county seat of Napa County, California.

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Natural rubber

Natural rubber, also called India rubber or caoutchouc, as initially produced, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds, plus water.

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Neodymium is a chemical element with symbol Nd and atomic number 60.

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Nitrous oxide

Nitrous oxide, commonly known as laughing gas or nitrous, is a chemical compound, an oxide of nitrogen with the formula.

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NTi Audio

NTi Audio AG is a manufacturer of test and measurement instruments for acoustics, audio and vibration applications.

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An organic light-emitting diode (OLED) is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compound that emits light in response to an electric current.

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Oliver Lodge

Sir Oliver Joseph Lodge, (12 June 1851 – 22 August 1940) was a British physicist and writer involved in the development of, and holder of key patents for, radio.

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Optical disc

In computing and optical disc recording technologies, an optical disc (OD) is a flat, usually circular disc which encodes binary data (bits) in the form of pits (binary value of 0 or off, due to lack of reflection when read) and lands (binary value of 1 or on, due to a reflection when read) on a special material (often aluminium) on one of its flat surfaces.

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Oskar Heil

Oskar Heil (20 March 1908, in Langwieden – 15 May 1994, San Mateo, California) was a German electrical engineer and inventor.

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Ozone, or trioxygen, is an inorganic molecule with the chemical formula.

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Parabolic loudspeaker

A parabolic loudspeaker is a loudspeaker which seeks to focus its sound in coherent plane waves either by reflecting sound output from a speaker driver to a parabolic reflector aimed at the target audience, or by arraying drivers on a parabolic surface.

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Pathé or Pathé Frères (styled as PATHÉ!) is the name of various French businesses that were founded and originally run by the Pathé Brothers of France starting in 1896.

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Peter L. Jensen

Peter Laurits Jensen (16 May 1886 – 26 October 1961) was a Danish American engineer, inventor and entrepreneur.

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Phase (waves)

Phase is the position of a point in time (an instant) on a waveform cycle.

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Phase plug

In a loudspeaker, a phase plug, phasing plug or acoustical transformer is a mechanical interface between a speaker driver and the audience.

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The phonograph is a device for the mechanical recording and reproduction of sound.

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Pioneer Corporation

commonly referred to as Pioneer, is a Japanese multinational corporation based in Tokyo, Japan that specializes in digital entertainment products.

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Planephones, or planofoni, represent an innovative sound art creation.

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Plasma (physics)

Plasma (Henry George Liddell, Robert Scott, A Greek English Lexicon, on Perseus) is one of the four fundamental states of matter, and was first described by chemist Irving Langmuir in the 1920s.

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Plasma speaker

Plasma speakers or ionophones are a form of loudspeaker which varies air pressure via a high-energy electrical plasma instead of a solid diaphragm.

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Plasmatronics is a company, founded by former Air Force Weapons Laboratory (now Phillips Laboratory) scientist Dr.

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Power supply

A power supply is an electrical device that supplies electric power to an electrical load.

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Powered speakers

Powered speakers, also known as self-powered speakers and active speakers, are loudspeakers that have built-in amplifiers.

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Public address system

A public address system (PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment.

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Radio is the technology of using radio waves to carry information, such as sound, by systematically modulating properties of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width.

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Radio frequency

Radio frequency (RF) refers to oscillatory change in voltage or current in a circuit, waveguide or transmission line in the range extending from around twenty thousand times per second to around three hundred billion times per second, roughly between the upper limit of audio and the lower limit of infrared.

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Radio receiver

In radio communications, a radio receiver (receiver or simply radio) is an electronic device that receives radio waves and converts the information carried by them to a usable form.

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Rare-earth magnet

Rare-earth magnets are strong permanent magnets made from alloys of rare-earth elements.

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A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element.

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In physics, resonance is a phenomenon in which a vibrating system or external force drives another system to oscillate with greater amplitude at specific frequencies.

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Roll-off is the steepness of a transmission function with frequency, particularly in electrical network analysis, and most especially in connection with filter circuits in the transition between a passband and a stopband.

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Room modes

Room modes are the collection of resonances that exist in a room when the room is excited by an acoustic source such as a loudspeaker.

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Rotary woofer

A rotary woofer is a subwoofer-style loudspeaker which reproduces very low frequency content by using a conventional speaker voice coil's motion to change the pitch of a set of fan blades rotating at a constant speed.

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Rudy Bozak

Rudolph Thomas Bozak (1910–1982) was an audio electronics and acoustics designer and engineer in the field of sound reproduction.

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Rule of thumb

The English phrase rule of thumb refers to a principle with broad application that is not intended to be strictly accurate or reliable for every situation.

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Samarium–cobalt magnet

A samarium–cobalt (SmCo) magnet, a type of rare earth magnet, is a strong permanent magnet made of an alloy of samarium and cobalt.

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Sampling (signal processing)

In signal processing, sampling is the reduction of a continuous-time signal to a discrete-time signal.

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Sensitivity (electronics)

The sensitivity of an electronic device, such as a communications system receiver, or detection device, such as a PIN diode, is the minimum magnitude of input signal required to produce a specified output signal having a specified signal-to-noise ratio, or other specified criteria.

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Silver is a chemical element with symbol Ag (from the Latin argentum, derived from the Proto-Indo-European ''h₂erǵ'': "shiny" or "white") and atomic number 47.

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Sonar (originally an acronym for SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.

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In physics, sound is a vibration that typically propagates as an audible wave of pressure, through a transmission medium such as a gas, liquid or solid.

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Sound from ultrasound

Sound from ultrasound is the name given here to the generation of audible sound from modulated ultrasound without using an active receiver.

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Sound power

Sound power or acoustic power is the rate at which sound energy is emitted, reflected, transmitted or received, per unit time.

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Sound pressure

Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average or equilibrium) atmospheric pressure, caused by a sound wave.

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Sound recording and reproduction

Sound recording and reproduction is an electrical, mechanical, electronic, or digital inscription and re-creation of sound waves, such as spoken voice, singing, instrumental music, or sound effects.

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Sound reinforcement system

A sound reinforcement system is the combination of microphones, signal processors, amplifiers, and loudspeakers in enclosures all controlled by a mixing console that makes live or pre-recorded sounds louder and may also distribute those sounds to a larger or more distant audience.

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A soundbar, sound bar or media bar is a type of loudspeaker that projects audio from a wide enclosure.

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Speaker driver

A speaker driver is an individual loudspeaker transducer that converts an electrical audio signal to sound waves.

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Speaker stands

Speaker stands are stands on which loudspeakers are placed with the aim of improving the quality of sound from the speaker.

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Speaker wire

Speaker wire is used to make the electrical connection between loudspeakers and audio amplifiers.

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A speakerphone is a telephone with a microphone and loudspeaker provided separately from those in the handset.

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Speakon connector

The Speakon (stylized speakON) is a trademarked name for an electrical connector, originally manufactured by Neutrik, mostly used in professional audio systems for connecting loudspeakers to amplifiers.

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Speech is the vocalized form of communication used by humans and some animals, which is based upon the syntactic combination of items drawn from the lexicon.

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Standing wave

In physics, a standing wave – also known as a stationary wave – is a wave which oscillates in time but whose peak amplitude profile does not move in space.

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Studio monitor

Studio monitors are loudspeakers in speaker enclosures specifically designed for professional audio production applications, such as recording studios, filmmaking, television studios, radio studios and project or home studios, where accurate audio reproduction is crucial.

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Styrofoam is a trademarked brand of closed-cell extruded polystyrene foam (XPS), commonly called "Blue Board" manufactured as foam continuous building insulation board used in walls, roofs, and foundations as thermal insulation and water barrier.

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A subwoofer (or sub) is a woofer, or a complete loudspeaker, which is dedicated to the reproduction of low-pitched audio frequencies known as bass and sub-bass.

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Super tweeter

A super tweeter is a speaker driver intended to produce ultra high frequencies in a multi-driver loudspeaker system.

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Surround sound

Surround sound is a technique for enriching the sound reproduction quality of an audio source with additional audio channels from speakers that surround the listener (surround channels).

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Tannoy Ltd is a British manufacturer of loudspeakers and public-address (PA) systems.

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A telephone, or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly.

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Television (TV) is a telecommunication medium used for transmitting moving images in monochrome (black and white), or in colour, and in two or three dimensions and sound.

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Thiele/Small parameters

Thiele/Small parameters (commonly abbreviated T/S, or TSP) are a set of electromechanical parameters that define the specified low frequency performance of a loudspeaker driver.

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Thomas Edison

Thomas Alva Edison (February 11, 1847October 18, 1931) was an American inventor and businessman, who has been described as America's greatest inventor.

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THX Ltd. is an American company headquartered in San Francisco, California, and founded in 1983 by George Lucas.

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In music, timbre (also known as tone color or tone quality from psychoacoustics) is the perceived sound quality of a musical note, sound or tone.

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A trade-off (or tradeoff) is a situational decision that involves diminishing or losing one quality, quantity or property of a set or design in return for gains in other aspects.

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A transducer is a device that converts energy from one form to another.

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A tweeter or treble speaker is a special type of loudspeaker (usually dome or horn-type) that is designed to produce high audio frequencies, typically from around 2,000 Hz to 20,000 Hz (generally considered to be the upper limit of human hearing).

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Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing.

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Victor Talking Machine Company

The Victor Talking Machine Company was an American record company and phonograph manufacturer headquartered in Camden, New Jersey.

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Viscoelasticity is the property of materials that exhibit both viscous and elastic characteristics when undergoing deformation.

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Voice coil

A voice coil (consisting of a former, collar, and winding) is the coil of wire attached to the apex of a loudspeaker cone.

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Walter H. Schottky

Walter Hans Schottky (23 July 1886 – 4 March 1976) was a German physicist who played a major early role in developing the theory of electron and ion emission phenomena, invented the screen-grid vacuum tube in 1915 and the pentode in 1919 while working at Siemens, co-invented the ribbon microphone and ribbon loudspeaker along with Dr.

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A watch is a timepiece intended to be carried or worn by a person.

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Werner von Siemens

Ernst Werner Siemens (von Siemens from 1888;; 13 December 1816 – 6 December 1892) was a German inventor and industrialist.

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Western Electric

Western Electric Company (WE, WECo) was an American electrical engineering and manufacturing company that served as the primary supplier to AT&T from 1881 to 1996.

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Wireless speaker

Wireless speakers are loudspeakers which receive audio signals using radio frequency (RF) waves rather than over audio cables.

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A woofer or bass speaker is a technical term for loudspeaker driver designed to produce low frequency sounds, typically from 40 Hz up to 500 Hz.

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1939 New York World's Fair

The 1939–40 New York World's Fair, which covered the of Flushing Meadows-Corona Park (also the location of the 1964–1965 New York World's Fair), was the second most expensive American world's fair of all time, exceeded only by St.

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[1] https://en.wikipedia.org/wiki/Loudspeaker

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