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  2. Quad Electrostatic Loudspeaker - Wikipedia

    en.wikipedia.org/wiki/Quad_Electrostatic_Loudspeaker

    Late version Quad "ESL-57" loudspeaker with black grilles and rosewood end caps. The Quad Electrostatic Loudspeaker (ESL) is the world's first production full-range electrostatic loudspeaker, launched in 1957 by Quad Electroacoustics, then known as the Acoustical Manufacturing Co. Ltd. [1] The speaker is shaped somewhat like a home electric radiator curved slightly on the vertical axis.

  3. Quad Electroacoustics - Wikipedia

    en.wikipedia.org/wiki/Quad_Electroacoustics

    A Quad L-ite satellite speaker provides the audio for a concert at home. Following the Verity acquisition, Quad developed and market a range of conventional electrodynamic loudspeakers alongside its electrostatic line, available in both passive and active (i.e. featuring in-box amplification) configurations.

  4. Mark Levinson Audio Systems - Wikipedia

    en.wikipedia.org/wiki/Mark_Levinson_Audio_Systems

    Mark Levinson Audio Systems Ltd. (MLAS) was founded 1972 in Woodbridge, Connecticut (a suburb of New Haven) by Mark Levinson.Original MLAS products were designed by John Curl (Hence the JC abbreviation to many of the early products) under the supervision of Mark Levinson, with a team of associates.

  5. Harman Kardon - Wikipedia

    en.wikipedia.org/wiki/Harman_Kardon

    Harman Kardon has also made laptop speakers, which have been used in certain models of Toshiba, Acer notebooks, Asus laptops, Apple iMacs and Huawei's M5 tablets. A pair of Harman Kardon transparent spherical speakers, along with the Apple G4 Mac Cube for which they were designed and produced from 2000 to 2001, are housed in the permanent ...

  6. Quadraphonic sound - Wikipedia

    en.wikipedia.org/wiki/Quadraphonic_sound

    A four channel quadraphonic diagram showing the usual placement of speakers around the listener. Quadraphonic (or quadrophonic, also called quadrasonic or by the neologism quadio [1] [formed by analogy with "stereo"]) sound – equivalent to what is now called 4.0 surround sound – uses four audio channels in which speakers are positioned at the four corners of a listening space.

  7. Braun LE1 - Wikipedia

    en.wikipedia.org/wiki/BRAUN_LE1

    The Braun LE1, Loudspeaker Unit 1 (German: Lautsprechereinheit 1), was the first electrostatic mode loudspeaker available on the German hi-fi market. German electronics company Braun started production in 1960 [1] with the technology licensed from the British Acoustical Manufacturing Co. Ltd. (now known as QUAD Electroacoustics).

  8. Electrodynamic speaker driver - Wikipedia

    en.wikipedia.org/wiki/Electrodynamic_speaker_driver

    All speaker drivers have a means of electrically inducing back-and-forth motion. Typically there is a tightly wound coil of insulated wire (known as a voice coil) attached to the neck of the driver's cone. In a ribbon speaker, the voice coil may be printed or bonded onto a sheet of very thin paper, aluminum, fiberglass or plastic.

  9. International Audio Group - Wikipedia

    en.wikipedia.org/wiki/International_Audio_Group

    In the past the IAG purchased several British HiFi manufacturers: Audiolab, Wharfedale, Quad Electroacoustics, Mission, Tag McLaren, and Castle Acoustics, Japanese brand Luxman, plus several Italian manufacturers of lighting equipment including f.a.l. and Coef. It has a manufacturing plant in Ji'an China employing 1500 people.