Altec Duplex Loudspeaker Data (c.1946)
By combining both high ond low frequency units in a compact two-way multi-cellular loudspeaker, Altec Lansing engineers have provided a point source of high quality sound for monitoring, radio, public address and recording The Duplex speaker in actual performance delivers up to 500% greater efficiencies in these operations. The Allec Lansing Duplex speaker delivers the very highest obtainable quality in home rodio, phonograph and F.M. reproduction,. Because of its high efficiency and small space requirements, the Duplex provides an ideal sound reinforcement system. Intermodulation effects always produced by single diaphragm type loudspeakers are not heard from the Duplex. It’s a new, small, compact two-way loudspeaker that revolutionizes the methods of sound reproduction.
Link for PDF: Altec Duplex Loudspeaker Data (c.1946) https://aboutprosound.com/wp-content/uploads/2022/11/Altec-1946-Duplex-Loudspeaker.pdf
