Product details of DBX 231 Dual Channel 31-Band 2 -Series Graphic Equalizer Frequency Response Flat: 20Hz-20kHz, 0, -0.5dB Bandwidth: 0.35Hz-80kHz, 0, -3dB Input impedance: 40k Balanced/Unbalanced Max Level: 22dBu Output Impedance: Balanced 4dBu: Balanced: 200l; Unbalanced: 100 -10dBV: Balanced: 1.5k; Unbalanced: 750 Max Level: 21dBu into 600 Side Chain Insert Input Impedance: >10k Output Impedance: 114dB, unweighted Crosstalk: <-93dB @ 1kHz Common Mode Rejection: >40dB (Any Frequency) Stereo Coupling: True RMS Power Summing Threshold Characteristics: Selectable OverEasy or hard knee Exp/Gate: Program Dependent Threshold Compressor: -40 to 20dB Expander/Gate: -60 to 10 dB Ratio: Compressor: 1:1 to :1 Expander/Gate 1:1 to 4:1 Attack Time Compressor: Scalable Program Dependent Expander/Gate: