[OLD MODEL] BEHRINGER ULTRAGRAPH PRO FBQ3102 Professional 31-band stereo Graphic Equalizer for both live and studio applications Revolutionary FBQ Feedback Detection System instantly reveals critical frequencies and can also be used as Audio Analyzer Dedicated mono subwoofer output with adjustable crossover frequency Additional sweepable high and low cut filters for each channel remove unwanted frequencies e.g. floor rumble, tape hiss etc. Servo-balanced inputs and outputs with 1/4" TRS and gold-plated XLR connectors