Professional 15-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 Dedicated mono subwoofer output with adjustable crossover frequency Additional low-cut filter removes unwanted frequencies, e.g. floor rumble Highly accurate 4-segment LED output metering and input gain controls for easy level setting Ultra-low noise audio operational amplifiers for highest signal integrity Servo-balanced inputs and outputs with 1/4″ TRS and gold-plated XLR connectors Shielded toroidal power transformer for ultra-low noise performance