The dbx 220i processor was designed to provide Installers with programmable system processing along with dbx’s Advanced Feedback Suppression™ (AFS™) algorithm for superior system control and performance. While the 220i offers all the tools necessary for processing a system, from EQ and De-Essing to Limiting and Ducking, the thing that sets this product apart from the competition is the inclusion of our patent-pending AFS™ algorithm that offers feedback filters with Qs up to 1/80th of an octave. This ensures that the music, or speech that comes in, goes out unblemished by the feedback detection and elimination process. In hundreds of demonstrations of this patent-pending algorithms, people have tried to discern between the original and processed signal, but to no avail.Beyond the processing that the 220i is capable of, the 220i also offers control from the ZC series wall panel controllers. These controllers provide convenient remote control capability of Program change, Zone output volume and Muting. The zone controllers are easy to install using CAT5 cable and fit in standard wall boxes.