ESS PS-820
Not much is documented about the ESS PS-820. The period-review file for this model is mostly garbled OCR. The only legible entry, in HI-Fi-Stereo-Buyers (1990, p.170), reads "PS-920" instead of "PS-820" - very possibly an OCR misreading of the same model. If that listing is this speaker, the PS-820 was a two-way bookshelf system with an 8-inch woofer in a passive-radiator enclosure and ESS's Heil air-motion transformer tweeter-midrange. The same listing gives power handling of 5-100 W, frequency response of 38-23,000 Hz ±1 dB, and sensitivity of 91 dB SPL/W/m.
No confirmed production dates, original price or service literature have surfaced. The archive's files hold no measured review of the PS-820 proper.
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