 The first high-quality loudspeaker developed expressly as a studio monitor was the Altec Lansing Duplex 604 in 1944.This innovative driver has historically been regarded as growing out of the work of James Bullough Lansing who had previously supplied the drivers for the Shearer Horn in 1936, a speaker that had rapidly become the industry standard in motion-picture sound.He had also designed the smaller Iconic and this was widely employed at the time as a motion-picture studio monitor.