Behringer FBQ2496 - Manual (Page 7)

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FEEDBACK DESTROYER PRO FBQ2496
You can replace fuses at the FUSE SWITCH of the FBQ2496.
Always replace fuses with the same type. Please follow the
instructions given in chapter 9 “SPECIFICATIONS.”
SERIAL NUMBER
Fig. 3.5: FBQ2496’s MIDI connections jacks
The FBQ2496 features a complete set of MIDI functions. In
addition to the usual MIDI IN and MIDI OUT ports, the MIDI
THRU allows you to loop through MIDI data.
Fig. 3.6: FBQ2496’s rear connections
Use the OPERATING LEVEL switch to change from home
recording level (-10 dBV) to studio level (+4 dBu), and vice
versa. The level meters are adapted automatically to the
selected nominal level, so that the FEEDBACK DESTROYER
PRO will always work in its optimum operating range.
INPUT LEFT/RIGHT
These are the balanced inputs of your FBQ2496. They are
laid out as 1/4" TRS and XLR connectors.
OUTPUT LEFT/RIGHT
Both of the FBQ2496 outputs are also laid out as balanced
1/4" TRS and XLR connectors.
4. FBQ2496 FILTERS
The FBQ2496 filters 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 filter
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 ( ).
Let us assume that both FEEDBACK DESTROYER PRO channels
are coupled in stereo.
The 20 filters pro channel can be divided up among Single-Shot
filters, automatic filters and parametric filters (fig. 4.2).
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The number of all filter types per channel is always 20!
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If the number of both fixed and parametric filters is set to zero,
your FBQ2496 operates with 20 automatic filters per channel.
Fig. 4.2: Different filter types (shown here in stereo operation)
4.1 Setting up Single-Shot filters
If no Single-Shot filters have been set up, the FBQ2496 looks for
critical frequencies after being powered up, and deploys as many
filters as necessary to combat the problem.
Single-Shot filters can be set up to work with extreme dependability
and comfort. To this end, either use the LEARN or the AUTOLEARN
function of your FBQ2496.
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To work with the LEARN or the AUTOLEARN function, the
FBQ2496 must be connected to a PA system.
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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.
Briefly press the LEARN button.
The button LED lights up and the LED on the PANIC button
blinks. The current number of Single-Shot filters is shown in
the display. (S 0 = no Single-Shot filter selected, S20 = all
filters deployed as Single-Shot filters).
The FBQ2496 immediately starts searching for critical
frequencies at maximum speed and deploys as many Single-
Shot filters as necessary (for this to work, your room has to
have a functioning PA system with a signal fed into it). The
number of filters 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
filters afterwards as well.
3. Press the LEARN button again to exit.
AUTOLEARN mode
This function is useful for automatically setting up Single-Shot
filters before the start of a live performance (“priming” the unit).
1.
Keep the LEARN button pressed for longer than one second.
Then, the following happens automatically:
s
The button LED blinks.
s All Single-Shot filters and automatic filters are reset.
s A time countdown runs in the display, from 16 seconds
to zero (L16, L15, ... , L 1, L 0).
The FBQ2496 creates impulses with a signal level of -15 dB
in order to provoke feedback. The overall amplification of
your FBQ2496 is incrementally increased from 0 dB to 15 dB).
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 filters.
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.
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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.
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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: -.
4. FBQ2496 FILTERS