Dbx 231 Dual 31-Band Graphic Equalizer With Sub Channel

The dbx 231 is a professional-grade, dual-channel 31-band graphic equalizer designed for live sound reinforcement, studio recording, and fixed installations. While the standard dbx 231 architecture manages full-range stereo signals without an integrated, dedicated subwoofer crossover sub-output, it serves as a powerful tool for shaping low-end response before signal distribution. To integrate a subwoofer with a standard dbx 231, audio engineers typically route the equalizer’s stereo outputs into an external active crossover network or directly into powered subwoofers equipped with internal high-pass filters. Specialized regional variants, such as the dbx 231SUB and EQX-231+, modify this classic design by integrating a dedicated, independent subwoofer XLR output channel complete with an adjustable crossover frequency control knob on the rear panel. This configuration allows seamless, single-unit control over both main stereo equalization and low-frequency management.Key SpecificationsFrequency Bands: Dual 31-band, 1/3-octave ISO spacing frequencies ranging from 20 Hz to 20 kHz.Input/Output Connections: Balanced XLR and 1/4″ TRS phone jacks for flexible system connectivity.Subwoofer Control (Specific Sub-Variants Only): Dedicated mono XLR subwoofer output with a variable crossover frequency control knob (typically 30 Hz to 200 Hz).Low-Cut Filter: Switchable 12dB/octave high-pass filter at 50 Hz to protect subwoofers and eliminate low-end rumble.Gain Ranges: Switchable boost/cut ranges of +/-6 dB or +/-12 dB for precise acoustic tuning.Dynamic Range: Typically greater than 108 dB to ensure clean, uncolored signal reproduction.Frequency Response: Ultra-wide bandwidth from 10 Hz to 50 kHz for pristine high-end clarity and deep low-end reproduction.