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Altec Lansing Duplex
The Duplex was a coaxial loudspeaker driver made by Altec Lansing beginning in 1941. The product was incorporated into various loudspeaker enclosures, and supplied with various crossovers to make studio monitors and public address system loudspeakers for professional audio.
Starting with the 601 model, Altec Lansing mated a low frequency woofer with a high frequency compression driver, the two drivers sharing a common center for better point-source clarity in sound. With the introduction of an Alnico magnet in the woofer and a larger voice coil in the compression driver, the 604 model was well received in the marketplace. Many recording studios used the Duplex 604 model for studio monitoring.
In 2006, the Altec Lansing 604 Duplex was inducted into the TECnology Hall of Fame.
== Altec 601 ==
The first Altec Lansing duplex speaker was the Altec 601 which was first manufactured in 1941 or 1943. It used a 12” paper cone for the bass driver with a two inch voice coil. It was designed with the magnet for the bass driver mounted on the back (as with any conventional loudspeaker) and the driver for the horn mounted on the back of that. There was then a hole up the middle of the magnet for the bass driver allowing the high frequency sound to pass through the magnet, through the horn and out to the listener. The 601 used an electromagnet (known as a field coil speaker) for the bass driver instead of a permanent magnet which is used on all speakers today. This was because strong permanent magnets were not readily available at the time. Soon after the release of the 601, Altec began working on a permanent magnet version. During the war Altec was involved in manufacturing detection equipment for the Marine Airborne Detection program. It was through this that they discovered a new type of permanent magnetic material; Alnico V. This was much stronger than any other Alnico magnet at the time. After the war, they used this technology to create a version of the 601 the 601a with a permanent magnet.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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