dbx 1231 Dual Channel 31-Band Equalizer

The dbx 1231 delivers responsive precision through dual 31-band channels, with smooth 45 mm faders that give you direct tactile control over every frequency in your mix. The dual-channel design lets you compare and contrast adjustments in real-time, making it an intuitive tool for mixing, mastering, and live sound applications. This is the kind of workhorse that rewards you with transparent, professional-grade tone shaping across rock, pop, electronic, and studio work.

Audio Performance & Control

With a dynamic range of 109–115 dB, signal-to-noise ratio of 90–97 dB, and THD+Noise under 0.005%, the 1231 delivers clean, artifact-free equalization. Interchannel crosstalk is minimized to less than −80 dB from 20 Hz to 20 kHz, ensuring transparent channel isolation and professional fidelity across the entire audio spectrum.

Design & Connectivity

The compact 19" rack-mountable chassis includes switchable 40 Hz/18 dB per octave low-cut filters on each channel and a choice of 6 or 15 dB boost/cut ranges to match your application. Balanced XLR, barrier strip, and 1/4" TRS connectors support both balanced and unbalanced I/O, while RF-filtered inputs and outputs keep interference at bay in demanding signal chains.

Key Features

• Dual channels with 31 1/3 octave bands at ISO frequency centers
• 45 mm faders for precise, hands-on control
• ±12 dB input gain range for flexible level management
• Switchable 40 Hz/18 dB per octave low-cut filters on each channel
• Switchable 6 or 15 dB boost/cut ranges
• XLR, barrier strip, and 1/4" TRS connectors with balanced and unbalanced options
• RF-filtered inputs and outputs
• Chassis and signal ground lift capabilities
• 4-LED bar graph output level display (−10, 0, +10, +18 dBu)
• Frequency response <10 Hz to >50 kHz
• Dynamic range 109–115 dB; SNR 90–97 dB; THD+Noise <0.005%
• Internal power supply transformer with power-off hardwire relay bypass and 2-second power-up delay

The dbx 1231 is a reliable, intuitive partner that delivers professional equalization exactly when and where you need it.