Behringer FBQ2496 Feedback Destroyer ProFEEDBACK DESTROYER PRO FBQ2496 The FBQ2496 Feedback Destroyer PRO is the fastest feedback suppressor on the market (less than 0. 2 seconds) and the only one to off er a 96 kHz sampling rate. This rack mountable audio solution is the quick, easy way to protect yourself and your audience from feedback. One Smart Solution Using an ultra fast feedback detection algorithm, the FBQ2496 automatically and intelligently locates up to 20 feedback frequencies