Shure DFR22 Audio Processor

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Shure DFR22 Audio Processor

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.


  • 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


  • Frequency Response: 20 Hz to 20 kHz ±1 dB
  • Dynamic Range: 110 dB minimum, A-weighted, 20 Hz to 20 kHz
  • Sampling Rate: 48 kHz
  • Digital-to-Analog, Analog-to-Digital Conversion: 24 bit
  • Impedance:
    • Input: 10 kΩ
    • Output: 120 Ω
  • Input Clipping Level: +24 dBu minimum
  • Output Clipping 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 from Input to Output: <1.5 ms
  • Polarity: Input to output: non-inverting (inverting optional)
  • Operating Voltage: 100-240 Vac, 50/60 Hz (auto-switching), 1 A, maximum
  • Maximum Power Drain: 45W
  • Temperature Range:
    • Operating: -7° to 49° C (19° to 120° F)
    • Storage: -29° to 74° C (-20° to 165° F)
  • Dimensions: 482.6 mm x 247.7 mm x 44.4 mm (19 in. x 9.75 in. x 1.75 in.)
  • Weight: 2.83 kg (6.25 lbs)


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