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8 FEEDBACK DESTROYER PRO FBQ2496 User Manual
4. FBQ2496 Filters
The FBQ2496 lters can be set up in an extremely narrow-band fashion. This way,
the FBQ2496 changes the way your music sounds to such a minor extent that the
actual change is absolutely negligible and inaudible.
Fig. 4.1: Filter curve of a narrow-band lter
1. Press POWER to turn the unit on. The display shows run (run).
2. Select whether you wish to run your FBQ2496 in stereo or in mono ((13)).
Let us assume that both FEEDBACK DESTROYER PRO channels are coupled
instereo.
The 20 lters pro channel can be divided up among Single-Shot lters,
automaticlters and parametric lters (g. 4.2).
◊ The number of all filter types per channel is always 20!
◊ If the number of both fixed and parametric filters is set to zero, your FBQ2496
operates with 20 automatic filters per channel.
Single Shot-
lters
automatic
lters
parametric
lters
Fig. 4.2: Dierent lter types (shown here in stereo operation)
4.1 Setting up Single-Shot lters
If no Single-Shot lters have been set up, the FBQ2496 looks for critical
frequencies after being powered up, and deploys as many lters as necessary to
combat the problem.
Single-Shot lters can be set up to work with extreme dependability and
comfort. To this end, either use the LEARN or the AUTOLEARN function of
yourFBQ2496.
◊ To work with the LEARN or the AUTOLEARN function, the FBQ2496 must
be connected to a PA system.
◊ Using the LEARN or AUTOLEARN functions only makes sense if you are
dealing with PA systems and rooms that are also used for concerts
and recordings.
LEARN mode
1. Briey press the LEARN button.
The button LED lights up and the LED on the PANIC button blinks. The current
number of Single-Shot lters is shown in the display. (S 0 = no Single-Shot
lter selected, S20 = all lters deployed as Single-Shot lters).
The FBQ2496 immediately starts searching for critical frequencies at
maximum speed and deploys as many Single-Shot lters as necessary
(forthis to work, your room has to have a functioning PA system with a
signal fed into it). The number of lters deployed will be increased on a
per-need basis and will be shown in the display.
2. You can use the wheel to change the number of Single-Shot lters
afterwards as well.
3. Press the LEARN button again to exit.
AUTOLEARN mode
This function is useful for automatically setting up Single-Shot lters before the
start of a live performance (“priming” the unit).
1. Keep the LEARN button pressed for longer than one second.
Then,thefollowing happens automatically:
• The button LED blinks.
• All Single-Shot filters and automatic filters are reset.
• A time countdown runs in the display, from 16 seconds to zero
(L1 6 , L1 5 , ... , L 1, L 0).
The FBQ2496 creates impulses with a signal level of -15dB in order to provoke
feedback. The overall amplication of your FBQ2496 is incrementally increased
from 0dB to 15dB). The FEEDBACK DESTROYER PRO detects the critical
frequencies and lowers them in an extremely narrow-band fashion.
2. Critical frequencies are consecutively lowered and stored in the storage slots
of the Single-Shot lters.
3. After the time had run out, the procedure is over. The LED on the LEARN
button is no longer lit and the display shows run.
◊ The frequency of the adjusted Single-Shot filters can not be
manually changed afterwards. However, minor feedback frequency
changes are implemented automatically. Gain adjustment is also
automatically performed in the background, constantly adjusting to
the current conditions.
◊ If a satisfactory setting for the Single-Shot and automatic filters
has been achieved, you can keep this setting by pressing the FREEZE
button. The display shows: -.