dbx DBX-1231 (1231) Equalizer

dbx Dual 31 band EQ with XLR or 1/4" inputs, 45mm faders

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What's in the box:

  • dbx 1231 - Dual Channel 31-Band Graphic Equalizer with 6 or 15 dB Switchable Boost/Cut and RF Filtered I/O's
  • Power Cable
  • Two Year Warranty

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Pro-featured EQ at a great price.

    The dbx 1231 Equalizer was designed to meet the needs of the most demanding sound reinforcement environments, while offering the simplicity of straightforward controls. The 1231 equalizer 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. Some other insightful features. 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. The visionary design of the dbx 12 Series makes your job easier.


  • 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
  • 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

Specifications for the dbx DBX-1231

{ "Input Connectors" : "1/4" TRS, female XLR (pin 2 hot), and barrier terminal strip", "Input Type" : "Electronically balanced/unbalanced, RF filtered ", "Input Impedance" : "Balanced 40 kOhm, unbalanced 20 kOhm ", "Max Input" : ">+21dBu balanced or unbalanced", "CMRR" : ">40dB, typically >55dB at 1kHz ", "Output Connectors" : "1/4" TRS, male XLR (pin 2 hot), and barrier terminal strip ", "Output Type" : "Impedance-balanced/unbalanced, RF filtered", "Output Impedance" : "Balanced 200 ohm, unbalanced 100 ohm", "Max Output" : ">+21dBu balanced/unbalanced into 2 kOhm or greater; >+18dBm balanced/unbalanced (into 600 ohm) ", "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 Ratio" : "90dB, 97dB", "THD+Noise" : "<0.005%", "Interchannel Crosstalk" : "<-80db, 20Hz to 20kHz", "Bypass Switch" : "Bypasses the graphic equalizer section in the signal path ", "Low cut Switch" : "(recessed) Activates the 40Hz 18dB/octave Bessel high-pass filter", "Range Switch" : "(recessed) Selects either +/- 6dB or +/- 15dB slider boost/cut range", "I/O Meter" : "4-LED bar graph (Green, Green, Yellow, Red) at -10, 0, +10, and +18dBu", "Indicators" : "EQ Bypass (Red); Clip (Red); Low Cut (Red); +/-6dB (Yellow); +/-15dB (Red)", "Operating Voltage" : "100VAC 50/60Hz; 120VAC 60Hz; 230VAC 50/60Hz", "Power Consumption" : "24W", "Power Connector" : "IEC receptacle", "Dimensions" : "5.25" H X 19" W X 7.9" D (13.4cm x 48.3cm x 20.1cm)", "Equipment Weight" : "10.6 lbs.", "Shipping Weight" : "11.6 lbs." }

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