Lansing Manufacturing was the only firm selling them as Shearer Horns. Western Electric named them Diaphonics, and RCA used them in their RCA Photophones. The Shearer Horn gave the desired improvements and Western Electric and RCA received the contracts to each build 75 units. Blackburn were part of the team that developed the Shearer Horn, with Lansing Manufacturing producing the 285 compression driver and the 15XS bass driver. John Hilliard, Robert Stephens, and John F. In 1933, head of the Metro-Goldwyn-Mayer (MGM) sound department, Douglas Shearer, dissatisfied with the loudspeakers of Western Electric and RCA, decided to develop his own. The firm was named Lansing Manufacturing Company, from March 1, 1927. Lansing and his business partner Ken Decker started a company in 1927, in Los Angeles, manufacturing six- and eight-inch speaker drivers for radio consoles and radio sets.
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