dbx 131s
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dbx 131s

The dbx 131s is a professional graphic equaliser with a proven track record that spans four decades. The dbx® EQs are the industry standard for touring, studios, and audio installations; the 131s meets the needs of the most demanding sound reinforcement environments, while offering simple straightforward controls.

The dbx 131s includes a single 31-band channel 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 110 dB dynamic range to the quality componentry and meticulous attention to detail, the 131s offers exceptional sound and rugged reliability that guarantees you will always sound your best.

Perfect for use in the studio, on tour and with installed sound venues, the dbx 131s 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.

  • Single 31-band, 1/3-octave Constant Q frequency bands
  • Switchable boost/cut ranges of ±6 or ±12dB
  • 12dB per octave, 3dB down @ 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
  • Frequency Response of <10Hz to >50kHz
  • Dynamic range of greater than 108dB
List Ex VAT: £145.83
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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

4.8 lbs.(2.2 kg)

Shipping Weight

6.2 lbs.(2.8kg)


1.75" (4.4cm) H x 6"(15.24cm) D x 19" (48.26cm) W