behringer, feedback destroyer

Behringer Pro FBQ2496 Feedback Destroyer 2-channel Feedback Suppressor with 24-bit/96kHz Sampling Rate, Ultra-fast Response, and Parametric EQ
  Behringer Pro FBQ2496 Feedback Destroyer (FBQ-2496 / FBQ 2496)

The Behringer Feedback Destroyer Pro FBQ2496 is the fastest feedback suppressor on the market.

Behringer Ultracurve Pro DEQ2496 Graphic Equalizers 24-bit/96kHz Equalizer, Analyzer, Feedback Destroyer and Mastering Processor with 4 EQ Modules, Dynamics, Digital Delay, Feedback Destroyer, and FFT Analyzer
  Behringer Ultracurve Pro DEQ2496 Graphic Equalizers (DEQ-2496 / DEQ 2496)

The Behringer Ultracurve Pro DEQ2496 is a 24-bit/96kHz Equalizer, Analyzer,