Dbx DriveRack 220i User Manual download pdf (Page 22)

Detailed Parameters

Section 3

220i

DriveRack™ User Manual

Level (2-8) -12 to 12 dB

Sets the overall level of the selected parametric EQ frequency.

Band 9 Frequency 20 to 20k (High Shelf)

Selects the frequency of the high shelf parametric EQ.

Slope 9 3-12dB/Octave

Sets the slope of the high shelf parametric EQ.

Level 9 -12 to 12 dB

Sets the overall gain of the high shelf parametric

The 220i offers the exclusive patent pending AFS (Advanced Feedback Suppression) feedback

elimination module. Feedback is caused when a microphonic signal such as a guitar pickup or

microphone is reproduced by an amplification and is repeatedly picked up in phase. The AFS

uses Precision Frequency Detection and state-of-the-art processing to determine the exact por-

tions of a given frequency of your feedback that need to be removed (instead of taking out

large sections of your sound). The AFS module of the 220i allows the user to optimize the elim-

ination 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 the AFS, the module removes the feedback auto-

matically and the proprietary, precision AFS filters remove only a fraction of the frequency spec-

trum. The following diagram shows AFS as opposed to competing, competitive feedback elimina-

tors and conventional graphic EQs:

AFS On/Off

Turns the AFS module on and off. If AFS is Off, the filters are bypassed, and the algorithm is

halted (the filters are not updated). If AFS is On, the filters are active, and the they are updat-

ed according to the current selected mode (Fixed or Live).

3.3 - Advanced Feedback Suppression

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Dbx DriveRack 220i User Manual Page 22