231s Dual 31-band, 1/3-octave Constant Q frequency bands - Image

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

The 231s offers allows true 1/3-octave bandwidth control at all slider positions.

231s Switchable boost/cut ranges of ±6 or ±12dB - Image

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

The 231s features a boost/cut switch that allows you to select which of the two boost/cut ranges the equalizer will use, either ±6 dB or ±12 dB. The red LED lights when the ±12 dB range is selected.

231s Bypass switch - Image

Bypass switch

Bypass the EQ with a simple press of the 231s's bypass switch that is conveniently located on the front panel.

231s ±12 dB input gain range - Image

±12 dB input gain range

The 231s is capable of -12 dB to +12 dB of gain.

231s 4-segment LED ladders for monitoring output levels - Image

4-segment LED ladders for monitoring output levels

Easily determine the processing status of the 231s via the front panel LEDs.

231s XLR and TRS Inputs and Outputs - Image

XLR and TRS Inputs and Outputs

The 231s has balanced inputs and outputs that can be used with any balanced or unbalanced line-level device.

231s Frequency Response of <10Hz to >50kHz - Image

Frequency Response of <10Hz to >50kHz

The 231s is able to easily respond and adjust for a speaker's frequency response based on its amazing 10 Hz to 50 kHz frequency response range.

231s Dynamic range of greater than 108dB - Image

Dynamic range of greater than 108dB

The 231s's wide dynamic range ensures clean, clear audio regardless of the audio content being processed.

Specs & Downloads

Item# DBX231SV


Do Wonders for Your P.A. with a dbx231s EQ!

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.

General Specifications

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

Audio Specifications

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)


Unit Weight
6.2 lbs. (2.81 kg)
Shipping Weight
7.9 lbs. (3.58 kg)
3.5 in (8.9 cm)
6 in (15.24 cm)
19 in (48.26 cm)

What's in The Box?

  • 1 x dbx231s
  • 1 x AC Power Cord
  • 1 x Operation Manual (including Registration Card)

Documents & Downloads

Reviews and Q&A

Customer Reviews

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