The Ultragraph Pro FBQ1502 is a professional, ultra-musical 15-band stereo graphic equalizer that is equally at home in both live and studio applications. It features the amazing, patent-pending FBQ Feedback Detection System that instantly detects feedback frequencies and can also be used as an audio analyzer, making the FBQ1502 a welcome addition to any touring rack. Another FBQ1502 highlight is its dedicated mono subwoofer output with adjustable crossover frequency that lets you add some extra punch to your music. • Ultra-Musical 15-Band Stereo Graphic Equalizer with FBQ Feedback Detection System • Dedicated mono subwoofer output with adjustable crossover frequency • Additional low cut filter removes unwanted frequencies, e.g. floor rumble • Ultra low-noise audio operational amplifiers offer outstanding sound performance • Servo-balanced inputs and outputs with 1/4" TRS and gold-plated XLR connectors