dbx AFS224 Manual - Manual (Page 6)

2 AFS™ 224 User Manual
AFS
™
224
Congratulations on your purchase of the dbx AFS™ 224. 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 content residing in the neighborhood of the status quo. So, to
raise the bar once again, we went out and developed a dedicated feedback suppression processor that
offers up to 24 filters per channel with widths as narrow as 1/80 of an octave. To achieve these staggering
numbers, we utilized our patent-pending AFS™ technology, which had previously only been available in
the upper echelon line of products. In addition to the plethora of feedback suppression filters available, the
AFS 224 also offers selectable filter widths, “Fixed” and “Live” filter types for static and dynamic filtering,
Live Filter Lift with selectable lift times, and dual mono or stereo operation, all readily available via the
front panel’s intuitive user interface. This manual will be your guide to understanding the full functionality
of the powerful AFS 224 processor.
Defining the AFS 224
The dbx AFS 224 provides the following features:
• dbx’s Patent-Pending Advanced Feedback Suppression (AFS™)
Technology
• 24 Programmable Filters per Channel
• Stereo or Dual Mono Processing
• Live and Fixed Filter Modes
• Selectable Filter Lift Times
• Application-Specific Filter Types Include: Speech; Music Low, Music
Med, and Music High
• Input Channel Metering
• 24 Segment Filter Metering per Channel
• XLR and TRS Electronically Balanced Input and Outputs
• +4dBu / -10dBV Operating Level Switch per Channel
The AFS 224 Advantage
Key features that make the AFS 224 are its Fixed and Live Modes of operation, as well as the units
Filter Lift capabilities. The Live Mode of operation continuously updates filter placement which provides
flexibility during a performance. The Filter Lift feature automatically removes filter assignments that are
no longer necessary, which in turn, maximizes sonic integrity.
The AFS 224 allows the user to optimize the elimination of feedback. In the past, graphic equalizers were
used to eliminate feedback from a system. This was an acceptable method for eliminating feedback, but
when this method was precision tested, the result clearly showed that a single 1/3 octave EQ slider was
removing approximately half of the signal power. With AFS™, the feedback is removed automatically
Introduction