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FEEDBACK DESTROYER PRO FBQ2496
immediately as well as the transportation company from
which you took delivery. Otherwise, all claims for
replacement/repair may be rendered invalid.
+ Please always use the original packaging to avoid damage
due to storage or shipping.
+ Never let unsupervised children play with the
FBQ2496 or with its packaging.
+ Please dispose of all packaging materials in an
environmentally friendly fashion.
1.1.2 Initial operation
Be sure that there is enough space around the unit for cooling. To
avoid overheating, do not place the FBQ2496 on top of power
amps or near radiators, etc.
+ Blown fuses must be replaced by fuses of the same type
and rating. Please refer to the SPECIFICATIONS for
further details.
The mains connection is made using the enclosed power cord and
a standard IEC receptacle. It meets all international safety
certification requirements.
+ Please make sure that all equipment is properly grounded
at all times. For your own safety, never remove or disable
the ground conductor of the unit or of the AC power cord.
1.1.3 Online registration
Please do remember to register your new BEHRINGER equipment
right after your purchase by visiting www.behringer.com
(alternatively www.behringer.de) and kindly read the terms and
conditions of our warranty carefully.
Should your BEHRINGER product malfunction, our goal is to have
it repaired as quickly as possible. To arrange for warranty service,
please contact the retailer from whom the equipment was
purchased. Should your BEHRINGER dealer not be located in
your vicinity, you may directly contact one of our subsidiaries.
Corresponding contact information is included in the original
equipment packaging (Global Contact Information/European
Contact Information). Should your country not be listed, please
contact the distributor nearest you. A list of distributors can be
found in the support area of our website (www.behringer.com/
support).
Registering your purchase and equipment with us helps us process
your repair claims quicker and more efficiently.
Thank you for your cooperation!
2. WHAT CAUSES FEEDBACK?
Fig. 2.1: How a feedback loop is created
A feedback loop is created when a microphone signal is first
reproduced on an amplifier, and is then picked up again by the
same microphone (with the same phasing). Then, it is amplified
and reproduced again. This feedback loop may, under certain
circumstances, keep on occurring and could escalate out of control.
With P.A. applications, there are two major types of setups in
which feedback can occur:
s Front mix (also called F.O.H. = front of house) refers to the
mix being created when a signal from a mixing console is
amplified by one or more power amplifiers and is fed into
loudspeakers facing the audience.
s Monitor mix refers to the mix that also originates in the
mixing console but ends up driving one or more stage
monitors. Unlike FOH speakers, a stage monitor makes the
music program audible to individual musicians.
+ Please bear in mind that high volume levels can damage
both your hearing and your equipment. Be sure to always
select an appropriate volume level.
3. CONTROL ELEMENTS AND
CONNECTIONS
3.1 The front
Fig. 3.1: Control elements on FBQ2496s left side
LEVEL METER
The LEVEL METER lets you monitor the input level. Eight
LEDs are available per channel. If the Clip LED lights up,
digital distortion may occur on FBQ2496s input. In this case,
reduce the input level.
LEARN button
A quick tap on the LEARN button (LED lights up) gets you
into the LEARN mode. The FBQ2496 will immediately start
looking for critical frequencies and will deploy as many
Single-Shot filters as necessary (of course, music or noise
has to be present in the room for this to work). Besides, using
the wheel
, you can manually determine the number of
Single-Shot filters (max. 20 per channel). See ch.4.1.
If you keep the LEARN button pressed for
longer than one
second (LED blinks), the FBQ2496 generates progressively
louder impulses to generate feedback. The feedback thus
created enters the FBQ2496 at its input, where it is recognized
and suppressed. This mode is called AUTOLEARN (ch. 4.1).
PANIC
If unexpected feedback starts occurring during a performance,
pressing the PANIC button can help. As long as the button is
kept pressed (for a maximum of 1 second), your FBQ2496
rapidly searches for feedback frequencies and suppresses
them.
SPEECH
Pressing the SPEECH button increases the sensitivity of
feedback suppression; the FBQ2496 recognizes critical
frequencies sooner and deploys a filter that cuts in
appropriately.
Unlike with feedback caused by a distorting guitar, human
speech seldom produces signals that can mistakenly be
identified as feedback. Therefore, this mode is ideal for
situations in which only speech is being transmitted. Therefore,
your P.A. system will be substantially louder.
FREEZE
Once a particularly good FBQ2496 setting is achieved, you
can keep this setting by pressing the FREEZE button. All
Single-Shot and automatic filters are kept at their settings
until you press FREEZE again.
FILTER LIFT
The so-called Filter Lifting Time informs you about how
long an adjusted automatic filter can remain inactive before
its values are reset again. You can set this time by first briefly
pressing the FILTER LIFT button and then turning the wheel.
The following time lengths are available: 0 min, 1 min,
5 min, 10 min, 30 min, 60min.
3. CONTROL ELEMENTS AND CONNECTIONS