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FEEDBACK DESTROYER FBQ1000 User Manual

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With the JOG WHEEL, a continuous rotary control, you can freely edit 

the selected parameters. Turn the wheel clockwise to increase the values, 

or counterclockwise to reduce them.

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With the FILTER SELECT key activated, you can use the Jog Wheel to select 

one of the 12 filters per channel. Subsequently, you can edit the filters.

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The FILTER MODE key gives you access to the four operating modes for the 

individual filters: “Off mode (OF)”, “Parametric EQ (PA)”,  “Single-Shot 

mode (SI)” and “Auto mode (AU)”. Please read chapter 6 “Operating Modes 

of the FBQ1000”.

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Use the ENGINE L key to select the left audio channel.

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Use the ENGINE R key to select the right audio channel. If you wish to 

process both channels at the same time (Couple mode), press both Engine 

keys together. In Couple mode both ENGINE LEDs light up. Whenever 

you edit one of the two audio channels and then switch to Couple mode, 

the parameters of the active channel will be copied to the other, i.e. if you 

press ENGINE L before ENGINE R, left will be copied to right.

Items  

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  through  

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  refer to Parametric EQ mode only 

(see chapters 5 and 7.3).

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Press the FREQUENCY key to select the frequency you wish to process. 

The adjustable frequency range is from 20 Hz through 20 kHz, which are split 

up by the FBQ1000 into the 31 standard ISO values of a graphic equalizer 

(see chapter 11.1 in the appendix).

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The FINE key allows you to fine tune the standard ISO frequencies (in 1/60-

octave steps), within a tuning range of 1/3 octave (-9/60 to +10/60).

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BANDWIDTH determines the filter bandwidth (Q factor) of the selected 

filter. This adjustable filter quality ranges from 1/60 octave to 2 octaves 

(120/60 octave).

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The GAIN key sets the desired boost/cut of the selected filter in 

dB (+16 dB/-48 dB).

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The IN/OUT key allows for optional bypassing of the parametric filters or 

all filters. By shortly pressing the IN/OUT key, only the Parametric EQ 

filters will be deactivated, and the green LED goes out. Hold down the key 

for about two seconds to deactivate all filters. This “Total Bypass” mode is 

indicated by the cyclic flashing of the green LED. Another short IN/OUT key 

press reactivates all filters. Additionally, the LED flashes when relevant MIDI 

data are being received.

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Any modifications made to a preset can be stored with the STORE key, 

in accordance with the number shown by the Display. Ten presets are 

available on the FBQ1000. Press the IN/OUT and STORE keys simultaneously 

to enter MIDI Setup mode.

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Use the POWER switch to switch the FEEDBACK DESTROYER on or off.

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Fig. 4.3: Rear panel connectors and control elements

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Use the OPERATING LEVEL switch to change from home recording level 

(-10 dBV) to studio level (+4 dBu), and vice versa. The level meters are 

adapted automatically to the selected nominal level, so that the FEEDBACK 

DESTROYER will always work in its optimum operating range.

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These are the balanced INPUTS of the FBQ1000, which are on 1/4" TRS and 

XLR connectors.

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The two OUTPUTS of your FEEDBACK DESTROYER are also on balanced 1/4" 

TRS and XLR connectors.

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SERIAL NUMBER. Please take the time to fill in and return the warranty card 

within 14 days after the date of purchase, so as to benefit from our extended 

warranty. Or use our online registration option available on the World Wide 

Web at behringer.com.

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The FBQ1000 features a complete set of MIDI functions. In addition to the 

usual MIDI IN  and MIDI OUT ports, the MIDI THRU allows you to loop 

through MIDI data.

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FUSE HOLDER / VOLTAGE SELECTOR. Please make sure that your local 

voltage matches the voltage indicated on the unit, before you attempt to 

connect and operate the unit. Blown fuses may only be replaced by fuses of 

the same type and rating. Some models allow for inserting the fuse holder 

in two different positions, in order to switch over from 230-V to 115-V 

operation, and vice versa. Please note that for 115-V operation outside 

Europe, you need to use a fuse of a higher rating (see chapter 1.2). Use the 

enclosed power cord to connect the unit to the mains.

In order to avoid confusion, let us give you a concise description of the FBQ1000’s 

operating principle, so as to make the three relevant points clear right from the 

start. Example: You have set up your P.A. system and connected all signal sources 

to the console. The FBQ1000 has been inserted into the monitor path (see fig. 2.1) 

or in single channel or sub-group inserts (see fig. 2.2); after power-up preset 

1 was loaded with the JOG WHEEL. Now, you can start to purposefully produce 

feedback, as described in chapter 3. Depending on the room acoustics, 

various feedback frequencies can occur. What exactly does the FBQ1000 do?
As can be seen from table 11.3, each of the ten presets on your FBQ1000 

comprises 24 separate filters, which can, however, be set to different 

operating modes: In our example, the first nine filters of the selected preset 

are set to Single-Shot mode (“SI”, see chapter 6.3). This mode is designed 

to detect feedback frequencies at fixed resonance values, and to suppress 

them consistently. So, these filters cannot be unlocked (status “LO” (locked)). 

Their bandwidth and gain reduction can be adapted if required, however, the 

frequency setting remains the same. In our example, the FBQ1000 is used to 

prevent nine fixed frequencies from “making trouble”.