With 6 inputs & 4 outputs the dbx Zone PRO 641 provides flexible signal routing, powerful DSP processing & multiple control interfaces for Commercial Audio applications. Designed to offer superior system sonic performance & flexibility, the 641/641 deliver the highest quality tools available. Even the input & outputs connectors were chosen for their standard usage & reliability. The Zone PRO products offer Euroblock connectors for balanced signals & RCA connectors for interfacing with consumer equipment often used in commercial applications; there is also a simple analog input buss that allows inputs to be sent from one unit to the next for unit & job scalability. The 641 & 641 provide every necessary processing tool, from the input processing like gain control & EQ available on all inputs to highly sophisticated & specific functions such as selectable paging microphone processing including Gating, De-Essing, Auto Gain Control, Compression & Feedback Suppression. The heart of the Zone PRO products is the Routing module that provides of course Primary Source Selection but also Source Ducking for Paging & Priority Override. The outputs also offer a wealth of processing designed for commercial applications like our patent-pending Auto Warmth function that was co-developed with JBL to provide natural low frequency extension at any signal level. Each output also offers EQ, Bandpass & Crossover filters, Limiting & Delay for system optimization. With the Zone PRO every tool is at your disposal to maximize the response of your system. Beyond processing, the Zone PRO products offer multiple forms of control to further extend the versatility of your system. From easy-to-use wall panel Zone Controllers for standard end-user functions like source select & volume control to advanced system control including a built-in Real Time Clock that can provide programmable system changes throughout the day or week. For system setup & monitoring the Zone PRO Designer software provides an intuitive interface & a speedy setup Wizard for configuring & editing all system parameters. The Zone PRO 641 will take your Commercial Audio system to the next level with advanced processing, versatility & control. Features Advanced Feedback Suppression (AFS) Autowarmth Auto Gain Control Compression Limiting Noise Gating Notch Filtering Bandpass & Crossover Filters Parametric EQ Security Lockout Impedance 50k ohm balanced, >75k ohm unbalanced