DBX 1231 Dual Chanel 31-Band Equalizer with 6 or 15 dB Switchable Boost/Cut and RF Filtered I/O's

SKU: DBX1231 MFR: 1231
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List Price: $449.94

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About DBX

The dbx 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.

DBX Features

  • 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

DBX Specifications

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
Input: Maximum Input Level
>+21dBu balanced or unbalanced
Input: 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
Output: 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
System Performance: Frequency Response
<10Hz to >50kHz, +0.5/-3dB
+/-15dB range +/-6dB range
System Performance: Dynamic Range
109dB 115dB
System Performance: Signal-to-Noise
90dB, 97dB
System Performance: THD + Noise
System Performance: Crosstalk
<-80db, 20Hz to 20kHz
Switches: EQ Bypass
Bypasses the graphic equalizer section in the signal path
Switches: Low Cut (recessed)
Activates the 40Hz 18dB/octave Bessel high-pass filter
Switches: Range (recessed)
Selects either +/- 6dB or +/- 15dB slider boost/cut range
Indicator: Output Level Meter
4-LED bar graph (Green, Green, Yellow, Red) at -10, 0, +10 and +18dBu
Indicator: EQ Bypass
1 LED: Red
Indicator: Clip
1 LED: Red
Indicator: Low Cut
1 LED: Red
Indicator: +/-6dB
1 LED: Yellow
Indicator: +/-15dB
1 LED: Red
Operating Voltage
100VAC 50/60Hz, 120VAC 60Hz
230VAC 50/60Hz
Power consumption
Main Connection
IEC receptacle
Dimensions (H x W xD)
5.25" X 19" X 7.9"(13.4cm x 48.3cm x 20.1cm)
10.6 lbs./4.80 kg
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