ADC 210
Little is documented about the ADC 210 beyond a handful of period ads and trade coverage. The record shows a compact, totally enclosed two-way speaker system that ADC marketed as a $100-quality design, but priced lower. An ad in Audio (April 1969, p.31) openly stated the company's challenge to its engineers: build a $100 speaker that would outperform any competitor in that price range, then sell it for less. The ad positioned the 210 for both bookshelf and free-standing use.
A trade report in High Fidelity Trade News (April 1970, p.50) added a few performance claims. Distortion was rated at 0.2% at rated output from 20 Hz to 20 kHz. IM distortion was below 0.15% at all power levels and unmeasurable at normal listening levels. Driver sizes, crossover points, impedance and sensitivity don't appear in any surviving source. Production years are unconfirmed, though the 1969 and 1970 citations bracket the likely availability.
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