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2. Quad Electroacoustics - Wikipedia

   en.wikipedia.org/wiki/Quad_Electroacoustics

   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.

3. 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.

4. Electrostatic loudspeaker - Wikipedia

   en.wikipedia.org/wiki/Electrostatic_loudspeaker

   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.

5. 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.

6. List of loudspeaker manufacturers - Wikipedia

   en.wikipedia.org/wiki/List_of_loudspeaker...

   Oswalds Mill Audio: United States Panasonic: Japan Peavey Electronics: United States Philips: Netherlands Pioneer: Japan 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 ...

7. Public health experts are warning of a ‘quad-demic’ this ...

   www.aol.com/finance/public-health-experts...

   Public health experts are warning of a ‘quad-demic’ this winter. Here’s where flu, COVID, RSV, and norovirus are spreading