DescriptionDugan automixers - Altecs, and prototype D at top.jpg
English: Racked automixers, ones using the Dugan algorithm. At the top is a light blue faceplate unit: the prototype of the Model D, made in the late 1980s. Descending from that: Descending in the rack: the Altec 1684A, the Altec 1678C, 1678B, and 1678A.
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{{Information |Description ={{en|1=Racked automixers, ones using the Dugan algorithm. At the top is a light blue faceplate unit: the prototype of the Model D, made in the late 1980s. Descending from that: Descending in the rack: the Altec 1684A, the Al
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