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4. dbx DriveRack Output is a line of hardware products produced by Harman’s dbx brand. These rack mount signal
processors provide detailed control for nal processing and crossovers before feeding the mix to one or more
speakers. This DriveRack functionality embedded into EON ONE MK2 is designed to optimize the combination of
speaker and Pass Thru outputs built into this JBL speaker.
a. AFS, or Automatic Feedback Suppression, is a combination of processing that can enable the user to add
up to 3 dB more total gain to their output before getting audio feedback back in through the mix inputs. dbx
AFS does this using a combination of auto-sensing and very tight width parametric EQs before the output
main EQ. Locked lters can be setup before an event as “xed” lters. Plus live AFS lters can be turned
on to continue chasing the latest feedback frequency risks during an event, such as changes caused by
handheld microphones moving positions and directions while on stage.
i. Stage setup best practices are always recommended for best results to avoid feedback,
in combination with the AFS processing system. Microphones have less chance of
contributing feedback if they follow the following position standards on stage:
. Microphones should be behind the front plane of the speakers.
. Microphones should be least two meters to the left or right of the speakers.
b. “AFS by dbx” On/Off selection toggles the AFS processor on or off.
c. “Live AFS” On/Off selection toggles the live AFS lters on or off. Live lters are best for catching feedback
on stage from microphones that are moving around the stage. Turning on “Live AFS” is the fastest, easiest
way to start using AFS processing.
d. “Reset Live Filters” will reset all live lters, prompting the lters to reset and start over in their discovery of
potential feedback frequency risks.
e. “Learn Fixed” starts the automatic discovery and setup of the Fixed AFS lters. While the microphones are
plugged in before the show and speakers are turned on, enable the “Learn Fixed” function. Then walk over
to the nearest mics and speak loudly into them to try to induce feedback. If no feedback is found, turn up
the main volume slowly until feedback rings and is suppressed by a xed AFS lter. Each time the speaker’s
AFS system notices feedback frequency it will automatically apply a xed lter at that frequency. Continue
speaking into the mics, including moving around the performer with handheld mics, speaking loudly into the
mics.
i. Turn off the “Live AFS” while operating the Learn Fixed setup.
ii. When all xed frequencies have been lled, the “Learn AFS” will automatically turn off and the Fixed
Filters are locked on for the event.
iii. If the user is unable to get all the xed AFS lters to complete frequency assignments, the user can
manually turn off “Learn AFS” by clicking the “Learn Fixed” setting again. Turning off “Learn AFS”
automatically leaves on the Fixed AFS On/Off setting.
iv. After completion of the Learned Fixed setup, turn on “Live AFS” for additional feedback suppression
during a live event.
f. “Remember Fixed on Reboot” Speakers are sometimes used in the same setup for extended times.
During this time speakers may be powered on and off multiple times. Turning on “Remember Fixed on
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