Sherwood EQA-280

The Sherwood EQA-280 is a 4-channel car audio graphic equalizer with a built-in amplifier. It gave the driver equalization control over all four speakers, not just the front pair. That was the point Sherwood led with when advertising it alongside the CRD-350 cassette receiver. As Audio (June 1987, p.121) reported, the EQA-280 delivered 20 watts per channel (80 watts total). The CRD-350/EQA-280 combo was voted “Among the most innovative consumer electronics products of the year” at the Summer Consumer Electronics Show.

Past that, the record thins out fast. The unit is black, intended for car use, and a service manual exists (available from Analog Alley Manuals and ManualsLib). A single eBay listing offers an untested example for parts. The available sources document no production years, original price, dimensions, frequency response, or THD figures. It also appears in a Stereo Review price listing from March 1992, alongside models like the Alphasonik PMA 2050E, but the dollar figures in that table cannot be confidently assigned to the EQA-280.

What is known: a four-channel EQ/amp hybrid from Sherwood's late-1980s car-audio line, recognized at CES for its four-speaker equalization.

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