User manual Behringer high-precision digital 24-bit/96 kHz EQ/RTA mastering processor DEQ2496

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ULTRACURVE PRO DEQ2496  
AUTO mode  
Microphones that are moved around during a performance  
(e.g. vocal mics) often suffer from varying feedback frequencies  
as a result of the changing positions on stage. This kind of  
feedback is best suppressed in AUTO mode. A filter in AUTO  
mode automatically identifies the optimum parameter settings for  
feedback suppression. If the feedback frequencies change, the  
AUTO filter can track them and keep suppressing them. It always  
selects the respective frequencies and a very narrow-band  
filter configuration to affect the wanted signal as little as possible.  
When all filters are locked in to a specific frequency, and a  
“new” feedback frequency occurs, then the filter with the “oldest”  
or first feedback frequency detected is released and used for  
the new one. If new feedback occurs very close to or even at  
an already identified frequency, the parameters of the filter  
already in use will be adapted, for example by widening its  
bandwidth or raising the amount of signal attenuation.  
Fig. 3.7: Filter curves with signal above/below the threshold  
.2.4 FBD menu  
The DEQ2496 features a “Feedback Destroyer” function, which  
corresponds largely to the PEQ menu as far as operation and  
choice of parameters are concerned. However, the FBD menu  
has some additional functions and therefore comprises three  
pages rather than just two.  
3
SNGL mode  
Filters in SNGL mode (single shot) also searches feedbacks  
automatically. If feedback is identified, the filter parameters are  
configured optimally for feedback suppression. Contrary to filters  
in AUTO mode, filters in SNGL mode lock in firmly to the identified  
frequency (LOCK FBD), however, their width and depth are still  
being adapted to changes in the feedback frequencies. The  
bandwidth is enlarged, if the feedback frequency shifts slightly,  
and the amount of attenuation is raised if feedback persists. To  
prevent a feedback frequency from recurring, the amount of  
attenuation is not reduced. Thus, SNGL mode is ideally suited to  
suppress constant feedback frequencies, as they are typically  
produced by fixed or permanently installed microphones.  
The Feedback Destroyer allows you to apply heavy attenuation  
no boost) to specific frequency ranges, so as to remove certain  
frequencies that are liable to cause feedback. With its extermely  
narrow-band filters it hardly affects the overall sound at all.  
(
Use the LOCK FBD function (B key in the left bottom part of the  
display) to lock the frequency of the SNGL filter manually  
(SNGL Ï). This means that the filter can only be modified in its  
bandwidth and amount of attenuation. With UNLOCK FBD  
Fig. 3.8: FBD menu (page 1)  
The first page shows a graphic representation of the filters. It  
is structured and operated in the same way as the first page in  
the PEQ menu. Since this menu can only be used to cut signals,  
the 0 dB line is located in the upper part of the display. The  
differences here are the settings ranges for the GAIN and  
BW(OCT) parameters. In order to achieve extremely narrow-  
band filters with high attenuation factors, the bandwidth ranges  
from 1/10 to 1/60 oct. and the GAIN from 0 to -60 dB.  
(B key) it can be unlocked again.  
Fig. 3.10: FBD menu (page 3)  
The third page provides three additional dynamics parameters  
+
At least one filter must be activated on page 2 to  
be able to access the first page of the FBD menu.  
for all FBD filters.  
SENS (upper data wheel) allows you to determine the point of  
onset for feedback suppression (describes the difference  
between feedback signal and overall level). When a signal  
reaches this difference, it gets reduced in level. The setting  
range here is from -3.0 to -9.0 dB. Use THRESHOLD (large data  
wheel) to select the threshold from which a certain frequency is  
considered to be feedback. The MAX. DEPTH parameter below  
determines the maximum attenuation of a filter (-18 to -60 dB) in  
Fig. 3.9: FBD menu (page 2)  
Page 2 provides a table showing the ten memory locations  
available. If parametric EQs have been activated in the PEQ menu,  
these will be shown here too, because the memory locations  
are intended for both FBD and PEQ settings.  
6
dB steps, and thus the GAIN setting range as displayed on the  
first and second page (lower data wheel).  
LEARN MODE is activated with the A key. This function  
generates additional short pulses and raises the overall gain to  
provoke feedback. Subsequently, the feedback signals arrive at  
the input of the DEQ2496, are identified and suppressed. LEARN  
MODE is ideal for use before a live event, for example to  
automatically configure the SNGL filters (“tuning-in” of a P.A.  
system).  
+
Any parametric EQs activated in the PEQ module  
cannot be edited in the Feedback Destroyer menu  
FBD)—and vice versa.  
(
In general, you can select two types of feedback filters: SNGL  
mode (single shot) and AUTO mode. To be able to identify  
feedback frequencies, the Feedback Destroyer splits up the  
entire frequency spectrum (20 Hz to 20 kHz) into bands of  
The following symbols inform you about the current status of  
the filters:  
1
/60 octave and measures their respective levels. The resulting  
values are then referenced to the level of the complete signal.  
The difference between these levels determines whether a filter  
is activated or not. As soon as a filter is set to AUTO or SNGL  
mode, the unit automatically tracks feedback frequencies and  
assigns the active filters to them.  
; In this setting, an AUTO or SNGL filter is “on duty” (RUN) to  
react to the incoming signal and effect the necessary  
settings.  
10  
3.MENU STRUCTURE AND EDITING  

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