The dbx 1231 is a professional dual-channel 31-band graphic equalizer providing the highest resolution tonal control for live sound, studios, and installed audio systems. With ISO-standard 1/3-octave band centers and dbx's constant-Q filter design, the 1231 enables precise system tuning with the resolution required to eliminate feedback, correct room anomalies, and tailor the system response to any acoustic environment.

• Dual-channel 31-band (1/3-octave) graphic equalizer with ISO-standard centers
• Constant-Q design for smooth, musical equalization
• ±15 dB boost/cut range on each of 31 bands per channel
• Professional input/output level controls for system gain matching
• Hard-bypass switch for instant A/B comparison
• 2U rack-mount design