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The 1231 is dual channel, 31 band 1/3 octave graphic equalizer. It was designed to meet the needs of the most demanding sound reinforcement environments, while offering the simplicity of straightforward controls.


The sliders of the 1231 are 45mm center detent, with two selectable boost/cut ranges for precise gain adjustments. The unit features high pass filters with bypass, active balanced input and output connections, chassis/signal ground lift capabilities for quick hum isolation and an internal power supply. Multiple input and output configurations are provided for ease of use. The XLR and 1/4" TRS connectors use active balanced, low noise circuitry, with the addition of barrier strips.


The 1231 was precision engineered to provide years of maintenance-free operation in any application. The magnetically isolated transformer, RF-filtered inputs and outputs, and power-off hard-wire relay bypass with two second power up delay, ensures compatibility with all types of installations.

The Features

Dual channel 31 band 1/3 octave graphic equalizer

Switchable Boost/Cut range between +/-6dB and +/-15dB45mm center detent sliders

Fixed high-pass filters

Variable input level controls

Active balanced input and output connections

RF filtered inputs and outputs

Chassis/signal ground lift capability

dbx 1231 Dual Channel 31-Band Graphic Equalizer

  • dbx 1231
  • Dual Channel 31-Band Graphic Equalizer
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