Behringer ULTRAGRAPH PRO FBQ1502HD Graphic with Feedback Detection and Subwoofer Output Equalizer, 15-Band Stereo,

Professional 15-band stereo graphic equalizer for live and studio use The revolutionary FBQ Feedback Detection system instantly identifies feedback-causing frequencies and can also be used as a general audio analyzer. Ultra-low noise 4580 op amp for best sound quality and response Mono subwoofer output with adjustable crossover frequency Low-cut filter removes unwanted rumbling low frequencies