DUPLEX was the trade name given by Altec Lansing to its line of coaxial loudspeakers, beginning with the first model 601 in 1943. However, the name was...

Altec Lansing, Inc. is an American audio electronics company founded in 1927. Their primary products are loudspeakers and associated audio electronics...

of the Altec Lansing Duplex 601 coaxial driver, recording studio monitors have often been coaxial loudspeaker designs. In 1945 the improved Altec 604 was...

do with competent design. The revolutionary coaxial driver, the Altec Lansing Duplex 601 and 604, used a multicell horn for its high frequency component...

crossover designs, and a major reworking and improvement of the Altec Lansing Duplex 604, the well-known high-fidelity coaxial loudspeaker driver originally...

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...

mix. The studio monitors were Big Reds, popular boxes based on the Altec Lansing Duplex 604 coaxial speaker, powered by McIntosh MC75 tube monoblock amplifiers...

were likely made by Western Electric. Altec Lansing introduced the 604, which became their most famous coaxial Duplex driver, in 1943. It incorporated a...