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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.
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.
The "X" option adds $2,000 to $11,000 to the price. So, for example, the 2.7i is $6000 and the 2.7X is $10,000. All Magnepans are 4-ohm speakers, with sensitivity of 86 dB at 500 Hz, 2.83 V. The 4 ohms has almost zero phase throughout the audio band, so aside from requiring a lot of current these are easy speakers to drive.
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 ...
ELS-6A - Electrostatic loudspeakers, 1976; ELS-F81 - Electrostatic loudspeaker, 1981; ESTA-4U - Electrostatic loudspeaker, 1982 (self-biasing) 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
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.
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