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Founded in 1936, Quad is one of British hi-fi's biggest names, though these days it's part of the Chinese IAG group. It's probably best known for its amplifiers, and for creating the world's first full-range electrostatic loudspeaker
This is the fiftieth anniversary of a hi-fi legend. It was 1957 when Quad stunned the hi-fi world by introducing the first full-range speaker based an electrostatic (as distinct from the usual electro-dynamic) principle of operation