Audio Research EC-4A
Little is documented about the Audio Research EC-4A. It shows up in a classified advertisement in Audio (June 1977, p.145) as an electronic crossover. The record shows classified ads for it in Audio magazine during the mid-1970s. The June 1977 listing (Audio, June 1977, p.145) offered a used EC-4A at $275, alongside other Audio Research components including D-100s amplifiers, a III-A, and Janis-style subwoofers. That one price and one classified snippet are nearly the whole known record.
No technical specifications appear in any period review or manufacturer literature examined for this archive. That means no crossover frequencies, slopes, input/output configuration or circuit topology. The EC-4A appears to be a variant of the EC-4, but the relationship between the two models is not documented. If you own an EC-4A or have literature, the Archive would welcome a correction.
- Brand: Audio Research
- Model: EC-4A
- Type: Electronic crossover
- Known price (used, 1977): $275
- Period source: Audio, June 1977, p.145 (classified ad)
- Related model: EC-4
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