Behringer Shark FBQ100 Automatic Feedback Destroyer with Integrated Microphone Preamp, Delay Line, Noise Gate and Compressor High performance single channel Feedback Destroyer with integrated microphone preamp, delay line, noise gate and compressor Automatically and "intelligently" locates and destroys up to 8 feedback frequencies Narrow FBQ filters for extremely effective feedback suppression, while keeping highest sonic quality Ultra-low noise Mic/Line input with Gain control and +48 V phantom power Delay line with up to 2.5 seconds of delay, adjustable in meters, feet and msec