Yamaha Q2031

Graphic equalizer

Yamaha Q2031 graphic equalizer rack
Buy one (35 on sale)

1984 (Dec.)
Initially sold for ¥90,000

The Yamaha Q2031 is a 31-band dual channel graphic equalizer, virtually identical to stacking two GQ1031 but with some extra features. For example, there are XLR balanced inputs and outputs, a High Pass filter for each channel and the ability to tune the levels more finely by adjusting the maximum boost/cut from 12dB to 6dB.

Before a slightly more important update in the 1990s, a minor revision was sold at a lower price in 1988, dubbed the Q2031A. The specs are identical.


  • 6 ore 12dB of boost or cut at any point, with points centered at ISO 1/3 octave frequencies from 20Hz to 20kHz.
  • Range switches on each channel reduce boost or cut from normal ± 12dB to ± 6dB for ultra-fine tuning.
  • High-pass filters on both channels provide 12dB per octave of roll-off below the desired frequency, variable 20-200 Hz.
  • Peak indicating LED's on both channels light 3dB below clipping.
  • Automatic muting circuit mutes output for 3 to 5 seconds after power is switched on to prevent transients from damaging amplifiers or speaker systems.
  • Both balanced XLR connectors and standard unbalanced phone jacks on all inputs and outputs.

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