The dbx 231s is a professional dual-channel 31-band graphic equalizer engineered to deliver exceptional sound quality and rugged reliability for live sound, studio, and installed audio applications. Building on over four decades of dbx signal processing heritage, this unit provides precise frequency control with two channels of 1/3-octave equalization, each featuring 31 constant Q frequency bands on ISO standard centers. The 20mm non-conductive sliders offer smooth, quiet operation with a positive center detent, ensuring accurate visual reference when set to flat.

The 231s incorporates several professional features including switchable boost/cut ranges of ±6 dB or ±12 dB, allowing for either subtle corrective equalization or broad tonal shaping. A ±12 dB input gain control with clip LED provides optimal level matching, while a 50 Hz low-cut filter with 12 dB per octave slope effectively removes unwanted low-frequency rumble. Four-segment LED ladders per channel deliver clear visual monitoring of output levels, and the front-panel bypass switch enables instant comparison of processed and unprocessed signals.

Built with high-quality components and meticulous attention to detail, the 231s offers an extended frequency response from below 10 Hz to beyond 50 kHz with a dynamic range exceeding 112 dB and total harmonic distortion below 0.003%. Comprehensive connectivity includes balanced XLR and 1/4-inch TRS inputs and outputs, with electronically balanced RF-filtered circuitry ensuring clean signal transfer. The energy-efficient universal switch-mode power supply automatically accepts any mains voltage from 100 to 240 VAC, making the unit suitable for worldwide use. Housed in a rugged 2U steel chassis, the dbx 231s delivers professional-grade performance and reliability at an accessible price point.