Applications - Behringer Feedback Destroyer FBQ1000 User Manual

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FEEDBACK DESTROYER FBQ1000 User Manual

2. Applications

The FBQ1000 is used exclusively to eliminate feedback in FOH and
monitor mixes.
Before you go on, please note the following two remarks:
◊ The FEEDBACK DESTROYER is not intended to be connected directly
to the microphones! If this is unavoidable, then we recommend our
proven BEHRINGER SHARK FBQ100 instead, which is equipped with a
dedicated microphone preamplifier.
◊
No processing device can undo the mistakes made when placing the
microphones! So, when you set up your mics, use them according to
their directivity and feedback susceptibility (see chapter 8 "Problems
Do Have A Cause ...").
2.1 Level setting
Take care to set levels properly on the FBQ1000, so as to successfully employ
the FEEDBACK DESTROYER to remove feedback. Use the LED LEVEL METER (1) .
Make sure that the top Clip LEDs flicker only rarely, but never light up all the time.
Low levels deteriorate the dynamics of the music signal, which results in a
poor, weak and noisy sound. On the other hand, excess levels overdriving the
converters in the FEEDBACK DESTROYER should also be avoided. Digital distortion
is (unlike its analog counterpart) very unpleasant to hear as it does not occur
gradually but abruptly.
2.2 Using the FEEDBACK DESTROYER in the
monitor path
Your FBQ1000 is equipped with two channels. In Couple mode (see control
elements (8) and (9) ), these two channels are linked. But you can also
use them separately, for example, to protect two dedicated monitor paths
against feedback.
Monitor mixes are realized either via the pre-fader Aux Sends on an FOH console,
or via a (usually stage-mount) monitor mixer. When using an additional monitor
mixer on the stage, you need a so-called splitter to route the single microphone
signals both to the FOH console and to the monitor mixer. When using the FOH
console for the monitor mix, the stage microphones are connected directly to the
console (if necessary, via a so-called stage box).
In both cases, separate monitor mixes are created for the musicians, which can
then be provided from the console outputs (usually via the Aux Send outputs).
Owing to its 2-channel design, your FEEDBACK DESTROYER allows you to protect
two monitor paths against feedback. To do so, connect the pre-fader Aux Send
outputs on your console to the inputs of the FBQ1000 (as shown in fig. 2.1).
Then, connect the inputs of the monitor power amps to the outputs of the
FEEDBACK DESTROYER (see fig. 2.1).
As already mentioned, monitor paths are particularly susceptible to feedback.
When vocal microphones are not installed in a fixed position, things become even
worse, so it really makes sense to protect the monitor paths against feedback.
Another positive side effect of using the FBQ1000 in the monitor path is the fact
that you can raise the volume levels considerably.
As you can see, your FBQ1000 is a perfect tool to protect two independent
monitor paths. But why is that so important? Because "monitoring" is a complex
task. Usually, each monitor path is used for an independent mix comprising a
variety of signal sources. This is the only way to ensure that each performer on
the stage can hear exactly what he or she wants.
◊ Owing to its 2-channel design, the FBQ1000 is the perfect tool for
application in two separate monitor paths. However, if you need to
protect four monitors against feedback, we recommend that you use a
second FBQ1000.
◊
If possible, all monitor paths should be set pre-fader, as this leaves the
monitor mix unaffected from any changes made to the FOH mix.
Monitor System
Monitor 1 Monitor 2
Power Amp
(Mono)
Output 1
Input 1
Pre-Fader
Aux Send 1
Fig. 2.1: Using the FBQ1000 in the monitor sends
2.3 Using the FEEDBACK DESTROYER
in the FOH mix
Since you want to make sure that deliberately produced feedback signals, such as
"guitar feedback", are not eliminated, you should try inserting the FBQ1000 into
those channels that are susceptible to feedback. For example, you could process
a vocal microphone that is liable to produce feedback by connecting the FBQ1000
to the insert points of the respective channel.
Outp. 1 Inp. 1
Outp. 2 Inp. 2
Channel Channel
Insert Insert
Fig. 2.2: Using the FBQ1000 for specific mics (connecting the FEEDBACK DESTROYER in either channel
or sub-group inserts)
◊ When processing a microphone signal with the FBQ1000 and a
compressor inserted into the same channel insert point, the FEEDBACK
DESTROYER should always be used pre-compressor: in this way,
the signal is taken at the insert jack, passes the FBQ1000, then the
compressor, and is finally routed back to the insert jack.
P.A. System
Output 2
Input 2
Pre-Fader
Aux Send 2
Master
Out
P.A. System
Master Out