Shure DFR22 Audio Processor with Feedback ReductionNotes In very good condition. Was used in a church setting, and well taken care of. Few small scuffs and scratches, barely visible. Two Channels. A Powerful Processor. Shure's DFR has quickly become the industry standard for effective feedback reduction. The DFR22 builds on that reputation to provide an affordable full featured 2x2 audio processor with Shure's drag and drop software. It's much more than feedback reduction. For many jobs, it's the only