What makes the dual-channel design useful for mixing and mastering?

Each of the two independent 31-band channels gives you real-time comparison capability—you can EQ and listen to two different versions of a track or bus simultaneously, or use one channel for mix work and the other for reference. This side-by-side approach is especially valuable when A/B testing EQ decisions during sessions or mastering.

Can I use the dbx 1231 with both balanced and unbalanced cables?

Yes. The 1231 includes XLR, barrier strip, and 1/4" TRS connectors to support balanced and unbalanced I/O, so it adapts to your existing signal chain whether you're in a studio or live-sound environment.

What is the frequency range and precision of the equalizer bands?

The 1231 offers 31 one-third octave bands at ISO frequency centers, covering less than 10 Hz to greater than 50 kHz. Each band is adjustable in your choice of ±6 dB or ±15 dB boost/cut ranges, depending on the application.

Does it have a high-pass filter for cleaning up low-end rumble?

Yes. Each channel includes a switchable 40 Hz low-cut filter with 18 dB per octave slope, useful for removing stage rumble in live sound or unwanted subsonic content in studio recording.

What are the noise and distortion specs?

Dynamic range is 109–115 dB, signal-to-noise ratio is 90–97 dB, THD+Noise is under 0.005%, and interchannel crosstalk is less than −80 dB across 20 Hz to 20 kHz, ensuring clean, artifact-free equalization in professional applications.

dbx 1231 Dual Channel 31-Band Equalizer

The dbx 1231 puts surgical frequency control in your hands with dual 31-band channels and smooth 45 mm faders that respond instantly to your touch. The dual-channel design lets you compare adjustments on the fly, making it an intuitive tool for shaping your live sound, dialing in monitor mixes, and crafting the tone you hear in your head. 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.

Condition	New
Country of Manufacture	China