Motorola EQB-3000 (c. 1978–1979)
Not much about the Motorola EQB-3000 survives in the period record. It appears to have been a five-band graphic equalizer/booster for car audio. Motorola's own advertising in HiFI-Stereo (October 1978, p.48) showed it as part of a complete in-dash system, next to the TC887AX cassette/AM-FM stereo and the company's 2-way and 3-way Pow-R-Handler speakers. The whole combination was rated at 30 watts of output. The equalizer had five frequency bands from 60 Hz to 10,000 Hz, plus a fader, so the driver could tailor the sound to road noise and speaker placement.
Audio (July 1978, p.54) published a measured response curve showing the range of control on the EQB-3000's slider levers. One vertical division equaled 10 dB. The curve confirms the unit worked as both equalizer and booster. Beyond those period descriptions, no specifications, pricing or production dates appear in the available record.
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