Introduction; What Causes Feedback - Behringer FEEDBACK DESTROYER PRO FBQ2496 User Manual

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FEEDBACK DESTROYER PRO FBQ2496 User Manual

1. Introduction

The FBQ2496 is the fastest (>0.2 sec.) and the only 96 kHz Feedback Suppressor
in this market price segment. Using an ultra-fast feedback detection algorithm,
it automatically and "intelligently" locates up to 20 feedback frequencies per
channel and sets extremely narrow notch filters to "destroy" them, leaving the
remainder of the signal virtually untouched.
Easy does it: with the "Set-and-Forget" default setting plus the Panic button,
your FEEDBACK DESTROYER can be up and running in no time! The auto mode
continuously monitors the mix, resetting programmed filters automatically,
while the manual mode allows individual setting of up to 40 fully parametric
filters with frequency, bandwidth and gain adjustment. Open MIDI architecture
means that future software updates and flexible communication with digital
equipment are a no-brainer. With its various modes you can master just about
any live sound situation or use it as a creative sound-shaping tool.
1.1 Before you get started
1.1.1 Shipment
Your FBQ2496 was carefully packed at the assembly plant to assure secure
transport. Should the condition of the cardboard box suggest that damage may
have taken place, please inspect the unit immediately and look for physical
indications of damage.
◊
Damaged equipment should NEVER be sent directly to us. Please inform
the dealer from whom you acquired the unit 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 register your new BEHRINGER equipment right after your purchase
by visiting http://behringer.com and read the terms and conditions of our
warranty carefully.
Should your BEHRINGER product malfunction, it is our intention to have it
repaired as quickly as possible. To arrange for warranty service, please contact
the BEHRINGER 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
(http://behringer.com).
Registering your purchase and equipment with us helps us process your repair
claims more quickly and efficiently.
Thank you for your cooperation!

2. What Causes Feedback?

UB2442FX-PRO
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:
• 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.
• 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.
EUROLIVE B1220
EUROPOWER EP1500