The ULTRAGRAPH PRO FBQ6200 takes the graphic equalizer a giant leap forward technologically, providing robust feature sets and our proprietary FBQ Feedback Detection System – at a price that makes them a must-have for anyone who records or operates a live sound system. The low-frequency sound range requires special attention. That’s why the FBQ6200 features ultra-precise, variable High- and Low-Cut filters on each channel, with a sweepable frequency that helps remove non-essential bass content, such as floor rumble, room resonance and electrical hum, etc., which really uses up your power amp’s headroom.