ESS AMT-1C (1981)
Not much is documented about the ESS AMT-1C beyond its appearances in early-1980s speaker directories. Those listings do make one thing clear: it was a complete loudspeaker, not a bare AMT driver. HiFI-Stereo (1981, p.172) listed it at $496 in genuine walnut veneer with a dark brown grille, measuring 26.75" H × 15.5" W × 15.5" D.
The driver lineup centered on ESS's signature 10.4 in² Heil air-motion transformer, which handled midrange and treble above a 2,400 Hz crossover. A cone woofer and a 10-inch fiberslate passive radiator filled in the bottom. Frequency response was rated 50-22,000 Hz ±3 dB, and maximum clean input was 100 W. Top-mounted midrange and brilliance controls allowed some adjustment. The same directory listing appears again on p.180 of the 1981 volume.
A fragmentary page from Audio (
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