Audio processor provides an affordable, full-featured 2x2 option with drag-and-drop software. Features include DFR Automatic Feedback Reduction, Parametric and Graphic Equalizers, Automatic Gain Control, Gate Expander, Ducker, Subwoofer, and more.

Main Features

  • 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


The Shure DFR Difference. Featuring enhancements to a 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.

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. 

Furnished Accessories

Amount Part Title
1 Power Cable (DFR22) Part 95A8389
1 Power Cable (DFR22E) Part 95A8247
1 5-pin DIN Shure Link Cable Part 95A8676
1 Hardware Kit Part 90AJ8100

Available Variants


Technical specifications

2830 g
Height x Width x Depth:
44.5 × 483.0 × 248.0 mm
Power Requirements:
AC Power, IEC Connector V, DC @ 160mA, supplied by external power supply
Inputs (Channels):
Outputs (Channels):
DANTE-Enabled Products:
Mixer/DSP Type:
Audio Processor

Further Technical Specifications

Further Specs:
  • Frequency Response: 20 Hz - 20 kHz
  • Dynamic Range: 110 dB minimum A-weighted, 20 Hz to 20 kHz
  • Sampling Rate: 48 kHz
  • Conversion: 24 bit
  • Impedance Input: 10 kΩ
  • Impedance Output: 120 Ω
  • Maximum input level: +24 dBu minimum
  • Maximum output level:
    • +24 dBu
    • +12 dBu (with 12 dB pad)
    • +6 dBu (with 18 dB pad)
  • Total harmonic Distortion : < 0.05%, +4 dBu, 20 Hz to 20 kHz
  • Propagation Delay: <1.5 ms
  • Operating Voltage: 100 - 240 Vac, 50/60 Hz (auto-switching), 1 A maximum
  • Maximum Power Drain: 45 W


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