Shure DFR22 2x2 Audio 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 audio processor you'll need.

Featuring enhancements to Shure's patented Adaptive Notch Filter Algorithm, the DFR22 includes single-channel and stereo processing blocks with up to 16 precision notch filters that automatically seek out and reduce feedback. With widths between 1/10 and 1/70 of an octave, these adaptive filters affect only the problem frequencies, maximizing system stability and sound integrity. In addition, Auto Clear mode removes dynamic filters and restores the DFR to your ideally-tuned configuration after a specified amount of time.

Processors include:
• DFR Automatic Feedback Reduction.
• Parametric and Graphic Equalizers.
• Cut/Shelf Equalizer.
• Compressors/Limiters.
• Automatic Gain Control.
• Gate/Downward Expander.
• Ducker .
• 2-Way Crossover .
• Subwoofer Processor .
• Splitter.
• Delay Processors.
• 2x2 Matrix Mixer.

Processing blocks in the DFR22 can be applied in any order, to any input or output. You can also link processors for more efficient global control. Copy and paste processing blocks to any input or output to duplicate processors across multiple channels.

With the DFR22, you can design the entire system, save it to disk, and load it at the job site for easy setup. The DFR22 also allows real-time design changes, so you can add, subtract, or change processing blocks as you tune the system. It makes setup a breeze. And ensures that you get the best possible customized processor for your application. Frequency response and signal levels can be visually monitored in real time as parameters are adjusted.

Shure's digital signal processors offer unparalleled automatic feedback reduction.

Why you need automatic feedback protection:
Because no sound system has an absolutely flat frequency response, feedback occurs at certain frequencies before others .
Adaptive equalization at these frequencies flattens the response of the system.
The system can operate at a higher overall volume level without feeding back.

How it works:
Feedback is detected at a specific frequency.
A shallow, narrow notch filter is deployed .
If necessary, the notch will continue to deepen and narrow (up to 1/70th octave) until the feedback is eliminated .
16 filters per channel can be deployed automatically.

The DFR22 Software Version 3 requires a PC with the following specifications to function properly:
• 20 MB available hard disk space.
• VGA monitor with 640 x 480/256 color, or higher resolution.
• Mouse or other pointing device.