dbx iEQ-15 Посібник користувача - Сторінка 14

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AFS™

First introduced in the DriveRack PA and 260 processors, the iEQ-15 and iEQ-31 both utilize dbx's

proprietary AFS™ (Advanced Feedback Suppression) algorithm, providing effortless feedback

elimination� AFS uses Precision Frequency Detection and state-of-the-art processing to pinpoint, with

more accuracy, the exact frequency where feedback occurs� 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 algorithm removes the feedback

automatically and the proprietary, precision AFS filters use narrower notch filters for removing the

feedback, thereby retaining the sonic integrity of the source material� This is what sets AFS apart from

using traditional EQ or other feedback elimination processors for feedback removal� The following

graph shows a comparison between AFS filters, the filters available in other feedback eliminators, and

conventional graphic EQ filters:

Competitor's

Feedback

Elimination

AFS utilizes two types of filters, they are:

NOTE: AFS works best when the gain structure of the sound system has been optimized� During use,

the iEQ's 0 dBu LED in the OUTPUT LEVEL meter should light with the +10 dBu LED lighting

occasionally�

Clearing Filters

To clear the AFS filters, press and hold the channel's AFS button until the adjacent LED meters begin to

flash, then release� This clears all filters which have been set in the channel�

IMPORTANT! It is advised to turn down the system's gain before clearing the AFS filters� If AFS filters

are set and feedback suppression is occuring, clearing the filters without turning down the system's gain

could cause the system to go into immediate feedback�

For more detailed information regarding the AFS algorithm, please see the AFS white paper located at

www�dbxpro�com�

Operation

• Fixed Filters - Fixed filters are used for ringing out a sound system before the system is

to be used, thereby notching out the most offending feedback frequencies within the venue�

Fixed filters are automatically stored in the iEQ processor, even after a power cycle, until

cleared by the user� These filters are typically best suited for fixed installation� To use the Fixed

filters, you must configure the iEQ for 6-Fixed/6-Live mode as described in the "Power-Up

Modes" section of this manual�

• Live Filters - Live filters work in the background and search for feedback during the

performance� Once all Live filters have been set, the filters will begin to round-robin (if new

feedback occurs, the first Live filter set will be lifted and placed in the new frequency location

to eliminate the new feedback)� Live filters are cleared when the iEQ is power cycled or when

cleared by the user�

iEQ User Manual

iEQ

dbx AFS™

1/3 Octave EQ