BEHRINGER Silver & Black (FBQ6200HD) Audiophile 31-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 Ultra-low noise 4580 operational amplifiers for highest signal integrity Dedicated Limiters with gain reduction meters for each channel protect your sound system from overload and distortion Pink noise generator provides test signals to adapt your sound system to any room acoustics