Skip to content

Hire Catalogue

dbx 231s Dual 31-Band Constant Q Graphic EQ

  • Two channels with 31 frequency bands each give you granular control of your sound
  • Get a great sound in any room, take on any sonic challenge and sound great
  • Adjustment range of ±12 dB or ±6 dB for larger or more precise changes
  • Fantastic clarity with less than 0.003% total harmonic distortion

High quality components for excellent results

The 231s gives you two 31-band channels of 1/3-octave equalisation with 20mm nonconductive sliders and an intuitive user interface with output level metering. Built from quality components with meticulous attention to detail, it offers an extended 10Hz to 50kHz frequency response with a 112dB dynamic range, plus a switchable +/-6dB or +/-12dB boost/cut range. The unit has XLR and TRS inputs and outputs, for flexibility in setup. The 231s is ideal for use in the studio, on tour or in fixed installations.


  • Dual 31-band, 1/3-octave Constant Q frequency bands
  • +/-12dB input gain range
  • 4-segment LED ladders for monitoring output levels
  • XLR and TRS inputs and outputs
  • Bypass switch to bypass graphic equaliser section in the signal path
  • Low Cut switch to activate the 50Hz 12dB/octave high-pass filter
  • Range switch to select either +/-6dB or +/-12dB slider boost/cut range


  • Input Connectors: 1/4″ TRS, Female XLR (Pin 2 Hot)
  • Input Type: Electronically Balanced / Unbalanced, RF Filtered
  • Input Impedance: Balanced 40kOhm, Unbalanced 20kOhm
  • Max Input: >+21dBu Balanced or Unbalanced
  • CMRR: >40dB, Typically >55dB at 1kHz
  • Output Connectors: 1/4″ TRS, Male XLR (Pin 2 Hot)
  • Output Type: Impedance Balanced / Unbalanced, RF Filtered
  • Output Impedance: Balanced 100 Ohm, Unbalanced 50 Ohm
  • Max Output: >+21dBu Balanced / Unbalanced into 2kOhm or Greater, >+18dBm Balanced / Unbalanced into 600 Ohm
  • Bandwidth: 20Hz to 20kHz, +0.5/-1dB
  • Frequency Response: 50kHz, +0.5/-3dB
  • Signal-to-Noise: Typically >95dB
  • Dynamic Range: Typically >112dB
  • THD+Noise: Interchannel Crosstalk: Power Consumption: 15W