Behringer FBQ100 (FBQ-100) Shark Automatic Single Channel Feedback Destroyer. Looking for feedback control? Maybe you need a compression or noise gate? Or a great DI box for line-level instruments? Whether you use it with microphones, acoustic instruments, or as a delay line for large venue loudspeaker systems, the FBQ100 is a “must-have” for your live and studio toolkit. Thanks to its intelligent “Learn Mode,” the FBQ100 can automatically equalize your PA and protect your sound system from feedback. Behringer’s search algorithm ensures feedback frequencies are attenuated within a fraction of a second, using narrow 1/60 octave singleshot filters. The remaining filters automatically take action as required, adjusting only the specific frequencies causing the feedback, so your music stays powerful and alive.