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dbx 131 Graphic Equaliser Front Panel

The dbx 2-Series Graphic Equalizers are designed to meet the needs of the most demanding sound reinforcement applications with simple straightforward controls that make it easy to use. The dbx 131 is a single channel equaliser with 31 1/3 octave bands on ISO frequency centres. The 20 mm faders and selectable +/-6 dB or +/-12 dB boost/cut range enable precise gain adjustments. The input gain is adjustable over a +/- 12 dB range, and a 50 Hz/12 dB per octave low-cut filter can be switched in when needed. Inputs and outputs are balanced for quiet operation and are provided with XLR and 1/4'' TRS connectors easy installation. Designed to make your job easier, the dbx 2-Series represents a major step forward in the performance of entry-level graphic equalizers by offering out of this world specifications with a down to earth price point. Ideal for applications including studios, touring and venue installations, the 2-Series 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 Channel.
  • Electronically balanced inputs via XLR and TRS connectors.
  • Impedance balanced inputs via XLR and TRS connectors.
  • RF-filtered inputs and outputs.
  • 20 mm stroke faders with centre detent.
  • 31 1/3 octave bands on ISO frequency centres.
  • 12 dB per octave, 3 dB down at 50Hz low-cut filter.
  • Selectable +/-6 dB or +/-12 dB boost/cut range for precise gain adjustment.
  • Equaliser bypass switch to bypass the graphic equalizer section in the signal path.
  • Output level indicator - four segment LED bar graph (Green, Green, Yellow, Red) at -10, 0, +10, and +18 dBu.
  • LED Clip indicator lights when internal signal is detected at 3 dB below clipping level.
  • LED indicators for EQ Bypass, +/-12 dB Range and low cut filter active.
  • 1U rack mounting steel/aluminium chassis.
  • Magnetically shielded internal power supply transformer.

Rear Panel Layout

dbx 131 Graphic Equaliser Rear Panel

Technical Specifications

Frequency Response < 10 Hz to > 50 kHz, +0.5/-3 dB
T.H.D. + Noise < 0.004 %
Interchannel Crosstalk < -80 dB, 20 Hz to 20 kHz
CMRR > 40 dB, typically > 55 dB at 1 kHz
Input Level Max > +21 dBu balanced or unbalanced
Input Impedance Balanced 40 k ohms, unbalanced 20 k ohms
Input Connectors 1/4" TRS, female XLR (pin 2 hot)
Input Type Electronically balanced/unbalanced, RF filtered
Output Level Max > +21 dBu into 2 k ohms or greater,> +18 dBm into 600 ohms
Output Impedance Balanced 100 ohms, unbalanced 50 ohms
Output Connectors 1/4" TRS, female XLR (pin 2 hot)
Output Type Impedance-balanced/unbalanced, RF filtered
Signal to Noise Ratio 90 dB
Dynamic Range 108 dB
Power Supply Required AC Mains 100 VAC 50-60 Hz, 120 VAC 60 Hz, 230 VAC 50-60 Hz
Power Consumption 12W
Construction Steel and aluminium panels, Black enamel finish


Width ..... 483 mm
Depth ..... 152 mm
Height ..... 45 mm
Weight .... 2.1 Kg
dbx 2 Series Graphic EQ Dimensions

Ordering Information

Description Order Code
dbx 131 Graphic Equaliser DBX-131
The information presented on this page is provided by courtesy of dbx Professional Products.
Revised: 21-Dec-2010 Copyright (C) 2010 Adena Limited