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DBX AFS224 Advanced Feedback Suppression Processor

  • Product Description
  • Product Video
  • Product Accessories
  • Warranty

The AFS 224 Advanced Feedback Suppression processor was designed to provide state-of-the art feedback elimination processing, while maintaining a simple and intuitive control interface. From the powerful DSP module to the no-nonsense user interface, the AFS 224 provides all the processing and control necessary for both installation and live use. The AFS 224 is an absolute must for any live sound application.

Ten and twelve filter feedback elimination processors have become the de facto standard, but the engineering staff at dbx have never been quite content residing in the neighborhood of the status quo. So, to raise the bar once again, they went out and developed a dedicated feedback suppression processor that offers up to 24 filters per channel with filter Qs up to 1/80 of an octave. To achieve these staggering numbers dbx utilized your patent-pending AFS technology that had previously only been available in the upper echelon line of products and made it available in this stand-alone processor, which takes all of the guesswork out of feedback removal. In addition to the plethora of feedback suppression filters available, the AFS 224 also offers selectable modes, live filter lift, and types of filtration, which are all readily available via the intuitive user interface front panel.

  • dbx's Patent-pending (Advanced Feedback Suppression) AFStechnology
  • 24 Programmable Filters per Channel
  • Stereo or Dual Independent Channel Processing
  • Live and Fixed Filter Modes
  • Selectable Filter Lift Times
  • Application-specific filter types include: Speech and Music Low, Med and High
  • Input channel Metering
  • 24 LED per Channel Filter Metering
  • XLR and TRS Inputs and Outputs


Number of Inputs: 2

Connections: Female XLR ad 1/4" TRS

Type: Electronically bal/unbal RF filtered

Impedance: Bal 40k ohm, unbal 20k ohm

Max. Input Level: +20dBu

CMRR: >40dB, typically >55dB @ 1kHz


Number of Outputs: 2

Connectors: Male XLR and 1/4" TRS

Type: Electronically bal/unbal, RF filtered

Impedance: Balanced >120 ohm, unbalanced >60 ohm

Max Output Level: +20dBu


Type: dbx Type IV conversion system

Dynamic Range: >114dB, A-weighted, >112dB unweighted

Type IV dynamic range: >119dB, A-weighted, 22kHz BW
>117dB, A-weighted, 22kHz BW

Sample Rate: 48kHz


Dynamic Range: 112dB, A-weighted, 110dB unweighed


Dynamic Range: >110dB, A-weighted, >107dB unweighted

THD+N: 0.002% typical at +4dBu, 1kHz, 0dB input gain

Frequency Response: 20Hz - 20kHz, +/-0.5dB

Interchannel Crosstalk: >80dB typical

Crosstalk input to
output >80dB


Operating Voltage: 100VAC 50/60Hz, 120VAC 60Hz and 230VAC 50/60Hz

Power consumption: 9 Watts
Safety Agency Approvals: UL 6500, IEC 60065, EN 55013, E 60065

Note: Specifications subject to change without notice.

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DBX warrants its products to be free from defects for 1 year from the date of purchase.

DBX: 801-566-8800