Altec 620
Documentation on the Altec 620 is thin. What survives is two forum posts - one on the Paul W. Klipsch forum, one on Audiokarma - and neither gives much beyond a basic description. This appears to have been a two-way control/bookshelf speaker system with a 12" woofer and a horn driver, and even that much comes with caveats.
The two sources agree on the woofer size and on the horn, but they differ on what the horn does. The Klipsch forum post calls it a "horn tweeter" with an 800 Hz crossover. The Audiokarma post just says "horn" and lists a 1500 Hz crossover. These could be two crossover points in the same speaker, one poster misremembering, or a real difference between production runs. The available record can't settle it. Neither source identifies the specific drivers, and neither mentions a midrange, so whether the 620 was truly a two-way or something more complex is unresolved.
Almost nothing else is recorded. No dimensions, weight, frequency response, sensitivity, impedance, or power handling figures exist in the research. There is no original price, no production years, no enclosure type, no cabinet details, and no terminal specifications. The speaker's own advertising in Recording-Engineer (December 1978, p.6) promoted Altec's studio monitor line in general, citing efficiency, dynamic range, and distortion-free power across the range. It named the 620 among the models but gave no model-specific specifications.
Known facts, in full:
- Two-way (presumed) control/bookshelf speaker system
- 12" woofer plus horn driver
- Crossover: 800 Hz (one source) or 1500 Hz (another source) — unresolved conflict
If you own a pair of 620s and can fill in the blanks - dimensions, crossover details, driver part numbers - the record would benefit.
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