Altec 415A
The Archive knows almost nothing about the Altec 415A. No manual, no spec sheet, and no confirmed production dates have turned up. That means no verified numbers for impedance, driver size, or frequency response on this page.
What does survive is period advertising that may or may not involve the 415A. In late 1955 and early 1956, Altec Lansing promoted a new series of "biflex" loudspeakers built around what they called multiple concentric compliances - stepped sections of a single cone radiating different frequencies for smoother, more extended response. Altec's own ad in High Fidelity (November 1955, p.91) claimed these new speakers outperformed anything else at comparable prices. The company followed up with a "we beg your pardon!" correction ad the next winter, apologizing for its earlier announcement in High Fidelity (February 1956, p.99). Around the same period, Altec was advertising complete high-fidelity systems priced from $324 to $1,180 in Audio (April 1956, p.13).
None of those ads names the 415A specifically, so the link is circumstantial. Still, a 415A owner is probably in the right neighborhood with the biflex era. The Archive would welcome photos of the label, a date code, or any documentation that fills in this thin record.
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