Behringer FBQ1502 Ultragraph Pro ultra-musical 15-band stereo graphic EQ with FBQ feedback detection system,, 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 control for easy level setting, Ultra-low noise audio operational amplifiers offer outstanding sound performance, Servo-balanced inputs and outputs with 1/4" TRS and gold-plated XLR connectors, Shielded toroidal power transformer for ultra-low noise performance, High-quality components and exceptionally rugged construction ensure long life, 19" rack/1U