Dbx 1231 Dual Channel 31-Band Graphic Equalizer

Professional Dual-Channel Graphic Equalization for Sound Systems

The dbx 1231 is a dual-channel 31-band graphic equalizer designed to give system engineers precise frequency control in demanding sound reinforcement, installed audio, and touring applications. With one-third octave resolution on each channel, it allows accurate tonal shaping, feedback control, and system tuning for PA systems, monitors, and broadcast audio chains.

Precision Frequency Control with Clear Tactile Feedback

Each channel features thirty-one 45mm center-detent sliders that provide smooth, repeatable adjustments across the entire audible frequency spectrum. Two selectable boost and cut ranges allow operators to choose between fine corrective control or more aggressive equalization, making the unit suitable for both subtle system tuning and corrective EQ tasks.

Flexible Filtering and Level Management

Integrated fixed high-pass filters help remove unwanted low-frequency rumble and stage noise, improving clarity and protecting speakers. Variable input level controls on each channel make it easy to match gain structure across different signal sources, ensuring consistent performance in complex audio systems.

Low-Noise Connectivity for Professional Installations

The dbx 1231 uses active balanced circuitry on both inputs and outputs to maintain signal integrity and minimize noise. XLR, 1/4-inch TRS, and barrier strip connections provide installation flexibility for touring racks, fixed installs, and broadcast environments. RF-filtered input and output stages further protect against interference in electrically noisy locations.

Built for Reliability in Critical Environments

Designed for long-term, maintenance-free operation, the equalizer includes features such as a magnetically isolated internal power supply and power-off hard-wire relay bypass. A chassis and signal ground lift option helps resolve grounding issues quickly, ensuring clean audio performance across a wide range of installations.

Dependable Performance for Live and Installed Audio

From front-of-house mixing and monitor control to permanent venue installations, the dbx 1231 delivers consistent results under continuous use. Its rugged construction and proven circuit design make it a dependable choice for engineers who require stability, accuracy, and repeatability.