DBX 1231 Dual Chanel 31-Band Equalizer

Dual 31 Band Graphic EQ - Ex Display - Last One!
DBX 1231 Dual Chanel 31-Band Equalizer


The dbx 12 Series were designed to meet the needs of the most demanding sound reinforcement environments, while offering the simplicity of straightforward controls.

The 1231 provides standard features like dual-channels, 31 1/3 octave bands, ISO frequency centers, +/- 12 dB input gain range, and switchable 40Hz/18 dB per octave low-cut filters, but also includes other insightful features.

These include 45 mm faders; selectable +/-6dB or +/-15dB boost/cut range for precise gain adjustments; XLR, barrier strip, and 1/4'' TRS connectors for installation ease; balanced inputs and outputs for quiet operation; and chassis/signal ground lift capabilities for quick hum isolation.


  • Switchable boost/cut ranges of ±6 or ±15 dB
  • Electronically balanced/unbalanced inputs
  • Servo balanced/unbalanced outputs
  • RF filtered inputs and outputs
  • XLR, Barrier Strip, and 1/4" TRS connectors
  • -12dB/+12dB input gain range
  • 18dB/octave 40Hz Bessel low-cut filter
  • Chassis/signal ground lift capability
  • Internal power supply transformer
  • Power-off hardwire relay bypass with 2-second power-up delay.


Connectors: 1/4" TRS, female XLR (pin 2 hot), and barrier terminal strip

Type: Electronically balanced/unbalanced, RF filtered

Impedance: Balanced 40 kOhm, unbalanced 20 kOhm

Max Input Level:  >+21dBu balanced or unbalanced

CMRR: >40dB, typically >55dB at 1kHz


Connectors:  1/4" TRS, male XLR (pin 2 hot), and barrier terminal strip

Type:  Impedance-balanaced/unbalanced, RF filtered

Impedance: Balanced 200 ohm, unbalanced 100 ohm

Max Output Level: 

>+21dBu balanced/unbalanced into 2 kOhm or greater

>+18dBm balanced/unbalanced (into 600 ohm)

System Performance

Bandwidth:  20Hz to 20kHz, +0.5/-1dB

Frequency Response: 

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

+/-15dB range +/-6dB range

Dynamic Range: 109dB 115dB

Signal - to -Noise: 90dB, 97dB

THD + Noise:  <0.005%

Interchannel Crosstalk:  <-80db, 20Hz to 20kHz

Function Switches

EQ Bypass: Bypasses the graphic equalizer section in the signal path

Low Cut (recessed): Activates the 40Hz 18dB/octave Bessel high-pass filter

Range (recessed): Selects either +/- 6dB or +/- 15dB slider boost/cut range


Output Level Meter:  4-LED bar graph (Green, Green, Yellow, Red) at -10, 0, +10, and +18dBu

EQ Bypass:  1 LED: Red

Clip: 1 LED: Red

Low Cut: 1 LED: Red

+/-6dB: 1 LED: Yellow

+/-15dB: 1 LED: Red

Power Supply

Operating Voltage:

100VAC 50/60Hz, 120VAC 60Hz

230VAC 50/60Hz

Power Consumption: 24W

Main Connection: IEC receptacle


Height 13.4cm

Width: 48.3cm

Depth: 20.1cm

Weight: 5.2 kg



  • Standard Delivery - Free
  • Express Delivery - $20
  • Store Pick Up (South Melbourne) - Free

Soundcorp will ship orders the first business day once all funds have cleared.


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