Behringer Feedback Destroyer Pro FBQ2496 User Manual

FEEDBACK DESTROYER PRO FBQ2496 User Manual

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Fig. 3.1: Control elements on FBQ2496’s left side

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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 

FBQ2496’s input. In this case, reduce the input level.

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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 

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, 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).

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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.

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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.

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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.

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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, 60 min.

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RESET 

If you briefly press the RESET button, all automatically set filters are erased. 

If you keep the RESET button pressed longer, Single-Shot filters are erased 

as well. 
In PEQ mode, briefly pressing the RESET button  erases the selected filter. 

Keeping the RESET button pressed longer erases all the parametric filters all 

at once.

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Fig. 3.2: Status display and the LED display on the FBQ2496

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The FBQ2496 features a total of 40 filters, i.e. 20 filters per channel. 

They can be monitored and controlled on the Status Display. A constantly lit 

LED signalizes:

A filter was deployed: It already suppresses an instance of feedback. or: 

A filter is in the Parametric EQ mode (PEQ), whereby gain has to be set 

to a value either higher or lower than 0 dB. A LED that only periodically 

blinks signalizes the selected filter in the PEQ mode.

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LED Display 

The three-digit numeric display indicates the absolute value of the 

parameter you are modifying. How individual parameter are adjusted is 

explained in ch. 4.

Hz or kHz is lit when you change the mid frequency of a filter.

The min display is lit when you are adjusting the filter lift time.

The 1/60 LED is lit when you select a filter value smaller than 0.1. In this 

case, you can select the following values: 1/60, 2/60, 3/60, 4/60 and 

5/60 (6/60 = 0.1).

The dB LED is lit when you adjust a filter gain value.

The MIDI display briefly lights up as soon as the FBQ2496 receives 

MIDI data.

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Fig. 3.3: Control elements on FBQ2496’s right

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GAIN 

In the PEQ mode, the GAIN button lets you adjust filter gain in dB (from 

+15 dB to -15 dB in 0.5-dB increments, and from -16 dB to -36 dB in 1-dB 

increments). The dB value set using the wheel is shown in the display.