Behringer ULTRAGRAPH PRO FBQ1502HD, a high-definition 15-band stereo graphic equalizer.

Behringer ULTRAGRAPH PRO FBQ3102HD dual-channel 31-band stereo graphic equalizer. Key features include:
Feedback Detection: Features the proprietary FBQ Feedback Detection System, which instantly highlights problem frequencies to eliminate feedback.
High-Precision Control: Offers 31 ISO-standard 1/3-octave frequency bands per channel for detailed audio shaping.
Filters: Includes sweepable high- and low-cut filters to remove unwanted hiss or rumble.
Subwoofer Output: Provides a dedicated mono subwoofer output with an adjustable crossover frequency (30–200 Hz).
Audio Performance: Employs ultra-low noise 4580 operational amplifiers for high signal integrity.