What Hath Quad Wraught?

British engineer Peter Walker invented the ESL-57 and produced and sold it under the brand name Quad through his company, the Acoustical Manufacturing Co. Quad is an acronym for Quality Unit Amplifier Domestic and originally was the name of an Acoustical Manufacturing Co. amplifier. Founded in 1936 in Huntingdon, England, Walker’s company eventually became Quad Electroacoustics

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