The DBX 2231 is a professional dual-channel, 31-band graphic equalizer and peak limiter housed in a single rack unit, serving as a fundamental tool for precise tonal shaping and system protection in live sound and installed audio applications. Each channel provides independent control over 31 frequency bands spaced at 1/3-octave intervals, corresponding to the ISO standard center frequencies, allowing for detailed correction of room resonances, feedback suppression, and tailoring of system response to match program material or acoustic preferences. The equalizer section offers a wide range of cut and boost per band, enabling sound engineers to surgically address problematic frequencies or creatively shape the overall tonal balance of a mix or sound system.

Integrated into each channel is a dedicated peak stop limiter, a crucial feature for protecting loudspeakers from damage caused by transient overloads. This limiter acts as a final safety gate, automatically attenuating any signal peaks that exceed a user-definable threshold, preventing clipping and distortion in the power amplifiers and downstream components. The 2231 is designed for sonic transparency in its equalization, utilizing high-quality components and circuit design to minimize phase shift and introduce minimal noise, ensuring that the processed signal remains clean and well-defined. Front-panel controls include input and output level adjustments, limiter threshold and release controls, and a range switch for selecting the EQ's cut/boost amplitude.

With balanced XLR and 1/4" TRS inputs and outputs, the DBX 2231 integrates seamlessly into any professional signal chain. Its rugged steel chassis and straightforward layout make it reliable and easy to use for both touring and permanent installation. The combination of precise equalization and robust limiting in a single, affordable unit has made the 2231 a classic and enduring piece of gear for system tuning, monitor world management, and general tone control, valued for its effectiveness, reliability, and straightforward operational workflow.