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...and early 70s...I just read an interview with ATC's engineers and they said when the co. was founded ('74), they tried to blend the high dynamic-range of U.S speakers ("often horns") with the "better fidelity" of the U.K.
I know about Klipsch and Altec horns, but I thought ESLs were audiophile-choices in the 60s -Quad, Janzen, KLH, Infinity. It appears Acoustat, Beveridge and Dayton-Wright came out in the 70s.
Maybe ESLs took longer than I thought, to become part of audiophile systems.
Edits: 06/15/17 06/15/17 06/15/17 06/15/17Follow Ups: