Marantz EQ-20D (1982–1984)
The Marantz EQ-20D is a stereo graphic equalizer produced from roughly 1982 to 1984. It sold for ¥39,800 in Japan. It's a ten-band design covering 30 Hz to 16 kHz, with the band split into ten sections per channel for left and right. Center frequencies run 30, 60, 120, 240, 500, 1k, 2k, 4k, 8k, and 16 kHz, each adjustable ±10 dB.
The spec sheet from audio-database.com shows solid numbers for the period. Total harmonic distortion is rated at 0.005% or less (1 V, 20 Hz to 20 kHz). Signal-to-noise ratio is 110 dB (IHF-A), and unity gain is 0 dB. Input impedance is 110k Ω with a 3.5k Ω output. The unit draws 8.5 W and measures 416 × 73 × 195 mm, weighing 2.8 kg per that source. A silver-faced variant, the EQ-20DS, was also produced. A wood side panel option appears to have been common on examples that surface today.
The record on this model is thin. No owner reviews with sound quality impressions, no production quantities, and no placement within Marantz's early-80s lineup have surfaced. What is known comes largely from Japanese market documentation and the occasional surviving unit. Some existing listings note the LED indicators and wood panels as points of condition. A separate Pinterest reference mentions a "Marantz EQ-20 (1981)" as a distinct model, but no relationship to the EQ-20D is documented.
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