AFS2 Dual-Channel Advanced Feedback Suppression Processor

The dbx AFS2 catches feedback before the room hears it. Two independent channels each carry up to 24 programmable filters, well beyond the ten or twelve found on most feedback processors, and those filters go as narrow as 1/80 of an octave. A narrow filter removes the ringing frequency and leaves the tone of the source intact, which matters when the microphone in question is carrying a lead vocal or a lectern.

The Wizard function walks you through setup for the room you are actually working in, so filter counts and modes are not a guessing game during soundcheck. Fixed filters lock in the trouble spots found during setup, while Live filters stay active during the show to catch feedback that appears when performers move or the room fills with people. Selectable filter lift times release a filter once the condition passes, so a correction made at soundcheck does not sit on the signal all night.

Application-specific filter types cover speech and music at low, medium, and high settings, which sets how aggressively the processor reacts to the material in front of it.

A full LCD display puts setup and monitoring information in front of you instead of buried in menus, and 24 LEDs per channel show which filters have fired and how hard they are working. Input metering keeps levels visible. Both channels offer XLR and 1/4" TRS inputs and outputs, so the AFS2 drops into a rack between a console and a crossover or amplifier.

Conversion uses dbx Type IV with dynamic range above 119 dB A-weighted, THD+Noise at 0.003% typical, and 20 Hz to 20 kHz response. The 1U chassis weighs 4.5 lb and draws 9 W.