[OLD MODEL] BEHRINGER ULTRAGRAPH PRO FBQ1502 Professional 15-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 Ultra low-noise audio operational amplifiers offer outstanding sound performance Shielded toroidal power transformer for ultra low-noise performance