Professional audio engineers have known for decades that a good EQ makes all the difference in how a performance is perceived. Although multi-band graphic equalizers have been around for a long time, they have changed very little... until now! The ULTRAGRAPH PRO FBQ6200HD takes the graphic equalizer into the realm of high-definition audio, providing robust features and Behringer proprietary FBQ Feedback Detection System - at a price that makes them a must-have for anyone who records or operates a live sound system. Audiophile 31-band stereo graphic equalizer for live and studio applications Revolutionary FBQ Feedback Detection system instantly reveals critical frequencies and can also be used as audio analyzer Ultra-low noise 4580 operational amplifiers for highest signal integrity Dedicated Limiters with gain reduction meters for each channel protect your sound system from overload and distortion Pink noise generator provides test signals to adapt your sound system to any room acoustics Mono subwoofer output with dedicated level control and adjustable crossover frequency Additional sweepable high and low-cut filters for each channel remove unwanted frequencies e.g. floor rumble, hiss etc. Highly accurate 8-segment LED input/output metering and input gain controls for easy level setting Relay-controlled hard bypass with an auto-bypass function during power failure (fail-safe relay) Servo-balanced inputs