The ULTRAGRAPH PRO FBQ6200 from Behringer is a professional 31-band stereo graphic equalizer for both live and studio applications. Its FBQ Feedback Detection System instantly detects feedback frequencies and can also be used as an audio analyzer, making the unit a welcome addition to every touring setup.Dedicated limiters with gain reduction meters for each channel protect the sound system from overload and distortion, and a pink noise generator provides test signals for equalizing the system to any room acoustics. The unit also provides a dedicated mono subwoofer output with adjustable crossover frequency.