The Nx Audio OPAL62 31+31 Constant Q Graphic Equalizer also includes Hi and Lo shelving contour controls for sweetening, Constant Q filters for better efficiency 8-segment LED input/output metering CLIP indicator, Balanced inputs and outputs on XLR, 1/4 inch jack and screw terminal connectors Opal-62 Graphic Equalizer Specifications: HP filter set to OUT. GAIN, HF, LF & all faders set to 0 INPUT SECTION Input Impedance: 10kOhm, electronically balanced Maximum Imput Level : >+20dBu CMRR: >-40dB @1kHz OUTPUT SECTION Output Impedance: < 50 Ohms, electronically balanced Maximum Output Level: >+20dBu into 600 Ohms FILTERS HP filter control: OUT to 250Hz @ 12dB/octave LF contour: +/-6dB shelving @ 50Hz 6dB/octave HF contour: +/-6dB shelving @ 14kHz 6db/octave FREQUENCY bands: +/-15dB on ISO centres with a Q of 4