Quad Electrostatic Loudspeaker
First production electrostatic loudspeaker / From Wikipedia, the free encyclopedia
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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. They are widely admired for their clarity and precision, but known to be difficult speakers to run and maintain.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/8/8c/Quad_ESL-57_luidspreker.jpg/220px-Quad_ESL-57_luidspreker.jpg)
The original ESL, in production between 1957 and 1985, has been hailed in Sound & Vision as one of the most important speakers of the 20th century.[1] It was succeeded in 1981 by the ESL-63, which remained in production until 1999. As of 2013, Quad maintains four electrostatic speakers in its range.