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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.
Quad electrostatic speaker. In late 1949 (or early 1950), the company launched the CR corner ribbon loudspeaker. This used a Goodmans Axiom 150 cone loudspeaker for the lower frequencies and an electromagnetic ribbon loudspeaker, designed by Acoustical, for the higher frequencies. Fewer than one thousand units were sold.
The first fully successful full-range electrostatic speaker, and also among the most influential, was produced in 1957: the Quad Electrostatic Loudspeaker (Quad ESL, later known as the ESL-57) from Quad Electroacoustics, of Huntingdon, England. These were shaped somewhat like a home electric radiator curved slightly on the vertical axis.
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 ...
EK-1 - Kit electrostatic speaker, 1983; ELS-F83 - Electrostatic loudspeaker, 1983; ESTA-4U Extra - Electrostatic loudspeaker, 1983 (self-biasing) EK-1/MK2 - Electrostatic loudspeaker, 1984; ELS-F81 NEW - Electrostatic loudspeaker, 1984; ELS-8X BB - Electrostatic loudspeaker, 1987 (battery-biased) ELS-6X - Electrostatic loudspeaker, 1988; ELS-8X ...
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).