The dbx 2231 is a professional-grade, dual-channel 31-band graphic equalizer and limiter widely considered an industry standard for live sound and studio applications. Part of the dbx 20 Series, it is known for its rugged construction and precise frequency management.

• Dual 31-Band Channels: Provides 1/3-octave equalization across the full audible range (20Hz to 20kHz) with 45mm nonconductive nylon sliders.
• Type III™ Noise Reduction: An instant encode/decode system that can increase the signal-to-noise ratio by up to 20dB.
• PeakPlus™ Limiting: Features a dedicated limiter circuit on each channel with a threshold range of 0dBu to +24dBu (off) to protect speakers from signal peaks.