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DBX 231 EQ Rack


At a price that fits even the tightest budgets, the dbx® 231 easily lives up to the dbx reputation. The 231 includes two 31-band channels of 1/3-octave equalization in addition to a range of 6 or 12 dB boost/cut, XLR, 20mm faders, and 1/4" inputs, nonconductive nylon sliders, and an easy-to-use user interface with thorough output and gain reduction metering. Exceptional sound, performance, and dependability are always the results of our rigorous attention to detail and premium componentry.


  • - Two 31-band, 1/3-octave Constant Q frequency bands
  • - Switchable boost/cut ranges of ±6 or ±12 dB
  • - 12dB per octave 50Hz low-cut filter
  • - Front panel bypass switch
  • - ±12 dB input gain range
  • - 4-segment LED ladders for monitoring output levels
  • - XLR and TRS Inputs and Outputs
  • - Internal Toroidal Transformer
  • - Frequency Response of <10Hz to >50kHz
  • - Dynamic range of greater than 108dB


Input Connectors 1/4" TRS, female XLR (pin 2 hot)
Input Type Electronically balanced/unbalanced, RF filtered
Input Impedance Balanced 40k ohm, unbalanced 20k ohm
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 2k ohm or greater; >+18dBm balanced/unbalanced (into 600 ohm)
Bandwidth 20Hz to 20kHz, +0.5/-1dB
Frequency Response <10Hz to >50kHz, +0.5/-3dB
Dynamic Range 108dB
Signal to Noise Ratio 90dB
THD+Noise <0.004%
Interchannel Crosstalk <-80dB, 20Hz to 20kHz
Bypass Switch Bypasses the graphic equalizer section in the signal path
Low cut Switch Activates the 50Hz 12dB/octave high-pass filter
Range Switch Selects either +/- 6dB or +/-12dB slider boost/cut range
Operating Voltage 100VAC 50/60Hz; 120VAC 60Hz; 230VAC 50/60Hz
Power Consumption 15W
Power Connector IEC receptacle
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