Dual Channel 31-Band Equalizer

Exceptional sound and rugged reliability

When the pros need an EQ, they turn to dbx. With a proven track record that spans four decades, dbx® EQs are the industry standard for touring, studios, and audio installations. With the dbx heritage of revered pro EQs, the 231s meets the needs of the most demanding sound reinforcement environments, while offering the simplicity of straightforward controls.

The dbx 231s includes two 31-band channels of 1/3-octave equalization, ±12 dB input gain, switchable ±6 dB or ±12 dB boost/cut range, 20mm nonconductive sliders, an intuitive user interface, and output level metering. From its extended 10Hz to 50kHz frequency response and 112 dB dynamic range to the quality componentry and meticulous attention to detail, the 231s offers exceptional sound and rugged reliability that guarantees you will always sound your best.

Sure to find a home in the studio, on tour and with installed sound venues, the dbx 231s is destined to take its rightful place in the lineage of great dbx signal processors that are the professional's choice in signal processing. With such affordable quality, there's no longer any excuse for compromising your sound.


·       Dual 31-band, 1/3-octave Constant Q frequency bands

·       Switchable boost/cut ranges of ±6 or ±12 dB

·       Front panel bypass switch

·       ±12 dB input gain range

·       4-segment LED ladders for monitoring output levels

·       XLR and TRS Inpts and Outputs

·       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


>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)


20Hz to 20kHz, +0.5/-1dB

Frequency Response

<10Hz to >50kHz, +0.5/-3dB

Dynamic Range

Typically >112dB

Signal to Noise Ratio

Typically >95dB



Interchannel Crosstalk

<-90dB, 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

100-240VAC 50/60Hz

Power Consumption


Power Connector

IEC receptacle

Unit Weight

6.2 lbs.(2.81 kg)

Shipping Weight

7.9 lbs.(3.58kg)


3.5" (8.9cm) H x 6"(15.24cm) D x 19" (48.26cm) W 

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