9
E
On start-up; all active filters (AU/SI) are indicated by flashing LEDs. When feedback has been detected and
dealt with, the LED stops flashing. When all filters are set the oldest automatic filter starts flashing, indicating
that it will be the next filter to handle new feedback. Parametric filters are also indicated by a non-flashing LED.
In Single Shot mode the filter will not release a setting which has been achieved until you manually change it.
This is particularly useful with problems at discrete frequencies like turntable resonances and fixed micro-
phone and monitor positions. If feedback is detected the filter will deal with that frequency and the status of that
filter will change to Locked (LO). It will only widen its bandwidth or increase the attenuation but it will not
release that setting to destroy a new feedback. In Auto mode the oldest filter will be released to destroy a new
feedback.
1.4 Control elements
Fig. 1.1: FEEDBACK DESTROYER PRO front panel
The BEHRINGER FEEDBACK DESTROYER PRO is equipped with ten parameters keys, one jog wheel
(rotary control) which is used to alter the selected parameter or preset and a numeric LED display. Each of the
24 filters has one LED assigned to it, which informs you about the status of the filter. By means of an 8-stage
LED meter each of the two fully independent channels can be monitored.
1.4.1 Front panel control elements
Fig. 1.2: Display section DSP1100P
1
The two
LED
chains read the output signal level in dB, referenced to the internal digital maximum. If the
FEEDBACK DESTROYER PRO is set to Total Bypass mode, the level meter displays the input level.
+
Please note that the nominal level of the FEEDBACK DESTROYER PRO can be selected with
the +4 dBu / -10 dBV switch located on the back panel.
2
The FEEDBACK DESTROYER PRO features 24 filters which can be monitored conveniently with the
indicators next to the display. Twelve LEDs inform you about the status of the filters of each channel
(left/right). A bright LED announces that a filter has been set. Cyclically flashing LEDs idicate filters that
are searching in Single-Shot and Auto mode.
3
After power-up, the
LED
display reads the number of the preset last used. This clearly legible, 2½ digit
numeric display has plus/minus indicators to show that parameters are being incremented or decremented
in Edit mode.
4
The indicators
Hz, kHz, 1/60
and
dB
to the right of the display light up when you change the associated
parameters in Edit mode. For example, if you raise the level of a filter, the dB indicator lights up. A +
to the left of the preset number signals that the level is being increased.
1. INTRODUCTION
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