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Line Array
A line array is a loudspeaker system that is made up of a number of usually identical loudspeaker elements mounted in a line and fed in phase, to create a near- line source of sound. The distance between adjacent drivers is close enough that they constructively interfere with each other to send sound waves farther than traditional horn-loaded loudspeakers, and with a more evenly distributed sound output pattern. Line arrays can be oriented in any direction, but their primary use in public address is in vertical arrays which provide a very narrow vertical output pattern useful for focusing sound at audiences without wasting output energy on ceilings or empty air above the audience. A vertical line array displays a normally wide horizontal pattern useful for supplying sound to the majority of a concert audience. By contrast, horizontal line arrays have a very narrow output pattern horizontally but a tall pattern vertically. A row of subwoofers along the front edge of a concert ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Rock Am Ring 2006 (cropped)
Bullet for My Valentine, often abbreviated as BFMV, are a Welsh Heavy metal music, heavy metal band from Bridgend, formed in 1998. The band is currently composed of Matthew Tuck (vocals, rhythm guitar), Michael Paget (lead guitar), Jason Bowld (drums) and Jamie Mathias (bass). Former members include Michael Thomas, Jason James and Nick Crandle; the latter were on bass. They were formed under the name Jeff Killed John and started their music career by covering songs by Metallica and Nirvana (band), Nirvana. Jeff Killed John recorded six songs which were not released; two of these tracks were reworked later in their career as Bullet for My Valentine. A change of style from that of Jeff Killed John led the band to change their name. In 2002, the band secured a five-album deal with Sony BMG. The band has stated that their music is influenced by classic metal acts such as Metallica, Iron Maiden and Slayer. The band is part of the Music of Cardiff, Cardiff music scene. Bullet for M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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L-Acoustics
L-Acoustics is a French manufacturer of loudspeakers, amplifiers, marketing materials, and signal processing devices. Headquartered in Marcoussis, south of Paris, the company has offices in the United States, United Kingdom and Germany. History In September 1984, Dr. Christian Heil, a physicist in the field of elementary particles with an interest in acoustics, created an electro-acoustic engineering firm named C.HEIL.TEA, later to be renamed L-Acoustics. In 1989, the company launched its MTD115, a coaxial loudspeaker for sound reinforcement use. In 1992, Heil and his team developed line source array loudspeakers with their V-DOSC system, using the company's Wavefront Sculpture Technology (WST) theory. Based on principles developed by Heil and physicist Professor Marcel Urban, WST defined five criteria for design and use of line source arrays. The WST uses a patented DOSC waveguide, which was the first high-frequency device capable of creating a rectangular, constant-phase pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Sound On Sound
''Sound on Sound'' is a monthly music technology magazine. The magazine includes product tests of electronic musical performance and recording devices, and interviews with industry professionals. Due to its technical focus, it is predominantly aimed at the professional recording studio market as well as artist project studios and home recording enthusiasts. Independently owned, the magazine is published by SOS Publications Group in Cambridge, United Kingdom. History The magazine was conceived, created and founded by brothers Ian and Paul Gilby and their friend Godfrey Davies in 1985. It was originally launched in 1985 on the UK Channel 4 television programme, '' The Tube'', championing the convergence of MIDI, computer technology and recording equipment. At the time of its launch, text for the magazine was edited on BBC Model B computers and pages were physically pasted together with wax. The modern magazine is full-colour throughout and led the way in using colour as much a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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James Thomas Engineering
James Thomas Engineering (JTE) is a British manufacturing company based in Worcester, Worcestershire. From 1990, the company also has offices in Knoxville, Tennessee. The company manufactures stage lighting equipment and stage rigging equipment, such as trusses, PAR lamp enclosures and more recently LED stage lighting equipment. History James Thomas Engineering was formed in February 1977 in a small garage in Bishampton, England by James Thomas and John Walters, manufacturing spun aluminium par lanterns. In 1978 it moved to Pershore and started manufacturing truss. It developed a pre-rigged truss system in 1983 and relocated to larger premises in Pershore in 1984. In 1990 JTE opened a USA office for manufacturing truss. In July 2000 the UK office relocated again to a larger 52,700 square foot facility in Worcester and in October 2001 the USA site relocated to a 30,000 square foot facility. In 2002 the company started manufacturing LED stage lighting fixtures as part ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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D&b Audiotechnik
d&b audiotechnik is a German loudspeaker and audio amplifier, amplifier manufacturer, founded in 1981, located in Backnang, north of Stuttgart. d&b is an international company with subsidiaries in Europe, America and Asia. Their products are produced in Germany. d&b equipment is mainly used in the rental and installation markets. Amnon Harman has been CEO since 2014. Milestones 1981-1990 April 18, 1981 - d&b audiotechnik is registered as a business in Korb near Stuttgart by Jürgen Daubert and Rolf Belz 1985 - The first complete product line 1988 - The 1220 system is d&b's entry into the installation market. 1989 - The company moves to Backnang. Their first overseas offices are opened in Great Britain and Scandinavia. 1991-2000 1996 - The company opens its first office in Italy 1997 - d&b audiotechnik begins using digital signal processing technology 1998 - An office in United States is opened 1999 and 2000 - Offices in Japan, France and Spain are opened, construction be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Interference (wave Propagation)
In physics, interference is a phenomenon in which two coherent waves are combined by adding their intensities or displacements with due consideration for their phase difference. The resultant wave may have greater amplitude (constructive interference) or lower amplitude (destructive interference) if the two waves are in phase or out of phase, respectively. Interference effects can be observed with all types of waves, for example, light, radio, acoustic, surface water waves, gravity waves, or matter waves as well as in loudspeakers as electrical waves. Etymology The word ''interference'' is derived from the Latin words ''inter'' which means "between" and ''fere'' which means "hit or strike", and was used in the context of wave superposition by Thomas Young in 1801. Mechanisms The principle of superposition of waves states that when two or more propagating waves of the same type are incident on the same point, the resultant amplitude at that point is equal to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Sound Intensity
Sound intensity, also known as acoustic intensity, is defined as the power carried by sound waves per unit area in a direction perpendicular to that area, also called the sound power density and the sound energy flux density. The SI unit of intensity, which includes sound intensity, is the watt per square meter (W/m2). One application is the noise measurement of sound intensity in the air at a listener's location as a sound energy quantity. Sound intensity is not the same physical quantity as sound pressure. Human hearing is sensitive to sound pressure which is related to sound intensity. In consumer audio electronics, the level differences are called "intensity" differences, but sound intensity is a specifically defined quantity and cannot be sensed by a simple microphone. Sound intensity level is a logarithmic expression of sound intensity relative to a reference intensity. Mathematical definition Sound intensity, denoted I, is defined by \mathbf I = p \mathbf v where * '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Point Source
A point source is a single identifiable ''localized'' source of something. A point source has a negligible extent, distinguishing it from other source geometries. Sources are called point sources because, in mathematical modeling, these sources can usually be approximated as a mathematical point to simplify analysis. The actual source need not be physically small if its size is negligible relative to other length scales in the problem. For example, in astronomy, stars are routinely treated as point sources, even though they are in actuality much larger than the Earth. In three dimensions, the density of something leaving a point source decreases in proportion to the inverse square of the distance from the source, if the distribution is isotropic, and there is no absorption or other loss. Mathematics In mathematics, a point source is a singularity from which flux or flow is emanating. Although singularities such as this do not exist in the observable universe, mathematical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Free Field (acoustics)
In acoustics, a free field is a situation or space in which no sound reflections occur. Characteristics The lack of reflections in a free field means that any sound in the field is entirely determined by a listener or microphone because it is received through the direct sound of the sound source. This makes the open field a direct sound field. In a free field, sound is attenuated with increased distance according to the inverse-square law. Examples and uses In nature, free field conditions occur only when sound reflections from the floor can be ignored, e.g. in new snow in a field, or approximately at good sound-absorbing floors (deciduous, dry sand, etc.) Free field conditions can be artificially produced in anechoic chambers. In particular, free field conditions play a major role in acoustic measurements and sound perception experiments as results are isolated from room reflections. With voice and sound recordings, one often seeks a condition free from sound reflections s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Thought Experiment
A thought experiment is an imaginary scenario that is meant to elucidate or test an argument or theory. It is often an experiment that would be hard, impossible, or unethical to actually perform. It can also be an abstract hypothetical that is meant to test our intuitions about morality or other fundamental philosophical questions. History The ancient Greek , "was the most ancient pattern of mathematical proof", and existed before Euclidean geometry, Euclidean mathematics, where the emphasis was on the conceptual, rather than on the experimental part of a thought experiment. Johann Witt-Hansen established that Hans Christian Ørsted was the first to use the equivalent German term . Ørsted was also the first to use the equivalent term in 1820. By 1883, Ernst Mach used in a different sense, to denote exclusively the conduct of a experiment that would be subsequently performed as a by his students. Physical and mental experimentation could then be contrasted: Mach asked hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Harry F
Harry may refer to: Television *Harry (American TV series), ''Harry'' (American TV series), 1987 comedy series starring Alan Arkin *Harry (British TV series), ''Harry'' (British TV series), 1993 BBC drama that ran for two seasons *Harry (New Zealand TV series), ''Harry'' (New Zealand TV series), 2013 crime drama starring Oscar Kightley#Professional career, Oscar Kightley *Harry (talk show), ''Harry'' (talk show), 2016 American daytime talk show hosted by Harry Connick Jr. People and fictional characters *Harry (given name), a list of people and fictional characters with the given name, including **Prince Harry, Duke of Sussex (born 1984) *Harry (surname), a list of people with the surname Other uses *"Harry", the tunnel used in the Stalag Luft III escape ("The Great Escape") of World War II *Harry (album), ''Harry'' (album), a 1969 album by Harry Nilsson *Harry (derogatory term), derogatory term used in Norway *Harry (newspaper), ''Harry'' (newspaper), an underground newspaper in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |