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Celestion Catalogue 1978
Celestion is a British designer and exporter of professional loudspeakers. History Origins What became Celestion was started in Hampton Wick (suburban London) in 1924. ''Cyril French'' and his three brothers had taken over a plating works and established the ''Electrical Manufacturing and Plating Company''. They were listed as "electrical instrument manufacturers". ''Eric Mackintosh'' approached Cyril French for assistance with improving a new loudspeaker he had already filed a patent for (British Patent No. 230,552 on 15 December 1923, issued 16 March 1925). The BBC had started their programme in November 1922 and was building up new senders, public interest in radio broadcasting grew rapidly. But listeners still needed to connect either earphones or gramophone horns to the first radio receivers. Installing a loudspeaker sensitive enough in decorative cabinets quickly made these sought-after pieces of furniture in the roaring twenties. French and Mackintosh perfected the d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ipswich
Ipswich () is a port town and borough in Suffolk, England, of which it is the county town. The town is located in East Anglia about away from the mouth of the River Orwell and the North Sea. Ipswich is both on the Great Eastern Main Line railway and the A12 road; it is north-east of London, east-southeast of Cambridge and south of Norwich. Ipswich is surrounded by two Areas of Outstanding Natural Beauty (AONB): Suffolk Coast and Heaths and Dedham Vale. Ipswich's modern name is derived from the medieval name ''Gippeswic'', probably taken either from an Anglo-Saxon personal name or from an earlier name given to the Orwell Estuary (although possibly unrelated to the name of the River Gipping). It has also been known as ''Gyppewicus'' and ''Yppswyche''. The town has been continuously occupied since the Saxon period, and is contested to be one of the oldest towns in the United Kingdom.Hills, Catherine"England's Oldest Town" Retrieved 2 August 2015. Ipswich was a settleme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Micro Precision Products
Micro Precision Products Ltd (MPP) was a British optical company that between 1941 and 1982 produced cameras and related equipment. (From 1976, its name was MPP Photographic Products Ltd.) MPP was formed in 1941 to sell equipment produced by Celestion Ltd.; in its early days, MPP employees also worked for Celestion or the related McMurdo Instrument Company. MPP was based in London: in Kingston until 1976, Wandsworth thereafter. Products MPP's first major product was the Micro-Technical Camera, in 1948. This was far in advance of any other camera produced in Britain. Mark II followed in 1949; Mark III in 1951; Marks VI, VII and VIII in 1952, 1956, and 1963. (Marks IV and V were not sold.) These had the full versatility and quality of technical cameras; some long remained in professional use. The Micro-Press Camera was a press camera available through the 1950s. MPP is the only postwar British manufacturer of twin-lens reflex cameras. The Microcord (1951) was based on the Roll ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Loudspeaker Enclosure
A loudspeaker enclosure or loudspeaker cabinet is an enclosure (often rectangular 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. Enclosures may range in design from simple, homemade DIY rectangular particleboard boxes to very complex, expensive computer-designed hi-fi cabinets that incorporate composite materials, internal baffles, horns, bass reflex ports and acoustic insulation. Loudspeaker enclosures range in size from small "bookshelf" speaker cabinets with woofers and small tweeters designed for listening to music with a hi-fi system in a private home to huge, heavy subwoofer enclosures with multiple or even speakers in huge enclosures which are designed for use in stadium concert sound reinforcement systems for rock music concerts. The primary role of the enclosure is to prevent sound waves generated by the rearward-facing surfa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interferometry
Interferometry is a technique which uses the ''interference'' of superimposed waves to extract information. Interferometry typically uses electromagnetic waves and is an important investigative technique in the fields of astronomy, fiber optics, engineering metrology, optical metrology, oceanography, seismology, spectroscopy (and its applications to chemistry), quantum mechanics, nuclear and particle physics, plasma physics, remote sensing, biomolecular interactions, surface profiling, microfluidics, mechanical stress/strain measurement, velocimetry, optometry, and making holograms. Interferometers are devices that extract information from interference. They are widely used in science and industry for the measurement of microscopic displacements, refractive index changes and surface irregularities. In the case with most interferometers, light from a single source is split into two beams that travel in different optical paths, which are then combined again to produce interfer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laser
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word "laser" is an acronym for "light amplification by stimulated emission of radiation". The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories, based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow. A laser differs from other sources of light in that it emits light which is ''coherent''. Spatial coherence allows a laser to be focused to a tight spot, enabling applications such as laser cutting and lithography. Spatial coherence also allows a laser beam to stay narrow over great distances (collimation), enabling applications such as laser pointers and lidar (light detection and ranging). Lasers can also have high temporal coherence, which allows them to emit light with a very narrow spectrum. Alternatively, temporal coherence can be used to produce ultrashort pulses of ligh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tweeter
A tweeter or treble speaker is a special type of loudspeaker (usually dome, inverse dome or horn-type) that is designed to produce high audio frequencies, typically deliver high frequencies up to 100 kHz. The name is derived from the high pitched sounds made by some birds (tweets), especially in contrast to the low woofs made by many dogs, after which low-frequency drivers are named (woofers). Operation Nearly all tweeters are electrodynamic drivers using a voice coil suspended within a fixed magnetic field. These designs operate by applying current from the output of an amplifier circuit to a coil of wire called a voice coil. The voice coil produces a varying magnetic field, which works against the fixed magnetic field of a permanent magnet around which the cylindrical voice coil is suspended, forcing the voice coil and the diaphragm attached to it to move. This mechanical movement resembles the waveform of the electronic signal supplied from the amplifier's output ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Celestion Catalogue 1978
Celestion is a British designer and exporter of professional loudspeakers. History Origins What became Celestion was started in Hampton Wick (suburban London) in 1924. ''Cyril French'' and his three brothers had taken over a plating works and established the ''Electrical Manufacturing and Plating Company''. They were listed as "electrical instrument manufacturers". ''Eric Mackintosh'' approached Cyril French for assistance with improving a new loudspeaker he had already filed a patent for (British Patent No. 230,552 on 15 December 1923, issued 16 March 1925). The BBC had started their programme in November 1922 and was building up new senders, public interest in radio broadcasting grew rapidly. But listeners still needed to connect either earphones or gramophone horns to the first radio receivers. Installing a loudspeaker sensitive enough in decorative cabinets quickly made these sought-after pieces of furniture in the roaring twenties. French and Mackintosh perfected the d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Home Cinema
Home cinema, also called home theaters or theater rooms, are home entertainment audio-visual systems that seek to reproduce a movie theater experience and mood using consumer electronics-grade video and audio equipment that is set up in a room or backyard of a private home. Some studies show films are rated better and generate more intense emotions when watched in a movie theater, however, convenience is a major appeal for home cinemas. In the 1980s, home cinemas typically consisted of a movie pre-recorded on a LaserDisc or VHS tape; a LaserDisc Player or VCR; and a heavy, bulky large-screen cathode ray tube TV set, although sometimes CRT projectors were used instead. In the 2000s, technological innovations in sound systems, video player equipment and TV screens and video projectors have changed the equipment used in home cinema set-ups and enabled home users to experience a higher-resolution screen image, improved sound quality and components that offer users more options (e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gold Peak
Gold Peak Industries (Holdings) Limited is a Hong Kong-based battery manufacturer established in 1964. They have been listed on the Hong Kong Stock Exchange since 1984. The Group has built few brand names for its major product categories, such as GP batteries, KEF premium consumer loudspeakers and Celestion professional loudspeakers. Gold Peak Industries (Holdings) Limited currently owns 85% interest in GP Industries while GP Industries holds an approximately 62% interest in GP Batteries. Both GP Industries and GP Batteries are publicly listed in Singapore. GP Industries Limited GP Industries is mainly engaged in the development, manufacture and marketing of electronics and acoustics products. This includes KEF consumer speakers and Celestion professional speaker drivers. Automotive wire harnesses GP Industries is one of China's manufacturers of automotive wire harnesses for the domestic market. Furthermore, it supplies Japanese, European and American automobiles. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
KEF (manufacturer)
Kef may refer to: Places *El Kef (also transliterated as ''Al-Kāf'' or ''Le Kef''), a city in northwestern Tunisia *Kef Governorate, Tunisia Others *'' Aram Bajakian's Kef'', a 2011 album by guitarist Aram Bajakian * ISO 639:kef or Ewe language of southeastern Ghana * Kef Kalesi, a castle near Adilcevaz, Turkey *A letter in a fictional alphabet in John Norman's Gor Gor () is the fictional setting for a series of sword and planet novels written by philosophy professor John Lange, writing as John Norman. The setting was first described in the 1966 novel ''Tarnsman of Gor''. The series is inspired by science f ... novels * Keflavík International Airport See also * KEF (other) * Kief, a form of cannabis {{disambiguation, geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Public Address System
A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music. PA systems are used in any public venue that requires that an announcer, performer, etc. be sufficiently audible at a distance or over a large area. Typical applications include sports stadiums, public transportation vehicles and facilities, and live or recorded music venues and events. A PA system may include multiple microphones or other sound sources, a mixing console to combine and modify multiple sources, and multiple amplifiers and loudspeakers for louder volume or wider distribution. Simple PA systems are often used in small venues such as school auditoriums, churches, and small bars. PA systems with many speakers are widely used to make announcements in public, institutional and commercial buildings ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
