![]() ![]() In 1944, the first of the world-renown ALTEC “604” series of DUPLEX®Loudspeakers (left) was introduced. Thus began the famous DUPLEX® series of loudspeakers. Called the “601”, it was of the field-coil type and included a small-format HF compression driver mounted to a 12″ low frequency loudspeaker with a hole bored through the pole piece of the woofer which connected to a 2 x 3 multicellular horn. Altec Lansing invented the first DUPLEX® Loudspeaker System in 1941 (some sources say 1943 – we’re really not sure).
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