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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.
Subsequent electrostatic models, the 988/989, the 2805/2905 and then the 2812/2912 were successive refinements of the ESL-63 design, featuring increased power handling and output levels, more sophisticated overload protection, and greater structural rigidity. A Quad L-ite satellite speaker provides the audio for a concert at home.
PMC speakers: United Kingdom Polk Audio: United States ProAc: United Kingdom PSB Speakers: Canada QSC Audio Products: United States Quad Electroacoustics: United Kingdom (brand) Radio Shack: United States RCF audio: Italy Rectilinear Research Corporation: United States Rega Research: United Kingdom Renkus-Heinz: United States ReVox: Switzerland ...
Although the ESL-63 was discontinued in 1999, Quad maintains production of electrostatic speakers. Quad introduced the ESL-988 and its larger variant the ESL-989 in 1999, the ESL-2805 and ESL-2905 in 2005, and the ESL-2812 and ESL-2912 in 2017, that incorporate electronic and transducer refinements.
Braun was the only foreign licensee of the QUAD electrostatic loudspeaker for a time. In 1954, the company also began producing film slide projectors, a mainstay of its business for the next forty years. By 1956, the company was marketing the first fully automatic tray film slide projector known as the PA 1. [nb 1] [6]
This was Levinson’s tri-amped active replay system. Each of the two channels comprising a woofer using a 24” Hartley drive unit, a pair of stacked Quad electrostatic speakers for the midrange and between the two Quad speakers a Decca (Kelly) ribbon tweeter for the treble, the latter modified by having the horn removed.
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).
Monsoon logo. Monsoon is a brand of loudspeakers, originally automotive speaker systems and later computer speakers.Monsoon was originally associated with OEM-sourced automotive audio speaker systems, notably supplied on a number of General Motors products and then later expanded onto other manufacturers such as Volkswagen.