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Feedback destroyer pro fbq2496, Fbq2496 filters – Behringer FBQ2496 User Manual

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FEEDBACK DESTROYER PRO FBQ2496

You can replace fuses at the FUSE SWITCH of the FBQ2496.

Always replace fuses with the same type. Please follow the

instructions given in chapter 9 “SPECIFICATIONS.”
SERIAL NUMBER

Fig. 3.5: FBQ2496’s MIDI connections jacks

The FBQ2496 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.

Fig. 3.6: FBQ2496’s rear connections

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

PRO will always work in its optimum operating range.
INPUT LEFT/RIGHT

These are the balanced inputs of your FBQ2496. They are

laid out as 1/4" TRS and XLR connectors.
OUTPUT LEFT/RIGHT

Both of the FBQ2496 outputs are also laid out as balanced

1/4" TRS and XLR connectors.

4. FBQ2496 FILTERS

The FBQ2496 filters can be set up in an extremely narrow-band

fashion. This way, the FBQ2496 changes the way your music sounds

to such a minor extent that the actual change is absolutely

negligible and inaudible.

Fig. 4.1: Filter curve of a narrow-band filter

1.

Press POWER to turn the unit on. The display shows run (run).

2.

Select whether you wish to run your FBQ2496 in stereo or in

mono (

).

Let us assume that both FEEDBACK DESTROYER PRO channels

are coupled in stereo.
The 20 filters pro channel can be divided up among Single-Shot

filters, automatic filters and parametric filters (fig. 4.2).

+

The number of all filter types per channel is always 20!

+

If the number of both fixed and parametric filters is set to zero,

your FBQ2496 operates with 20 automatic filters per channel.

Fig. 4.2: Different filter types (shown here in stereo operation)

4.1 Setting up Single-Shot filters

If no Single-Shot filters have been set up, the FBQ2496 looks for

critical frequencies after being powered up, and deploys as many

filters as necessary to combat the problem.
Single-Shot filters can be set up to work with extreme dependability

and comfort. To this end, either use the LEARN or the AUTOLEARN

function of your FBQ2496.

+

To work with the LEARN or the AUTOLEARN function, the

FBQ2496 must be connected to a PA system.

+

Using the LEARN or AUTOLEARN functions only makes

sense if you are dealing with PA systems and rooms that

are also used for concerts and recordings.

LEARN mode
1.

Briefly press the LEARN button.

The button LED lights up and the LED on the PANIC button

blinks. The current number of Single-Shot filters is shown in

the display. (S 0 = no Single-Shot filter selected, S20 = all

filters deployed as Single-Shot filters).

The FBQ2496 immediately starts searching for critical

frequencies at maximum speed and deploys as many Single-

Shot filters as necessary (for this to work, your room has to

have a functioning PA system with a signal fed into it). The

number of filters deployed will be increased on a per-need

basis and will be shown in the display.

2.

You can use the wheel to change the number of Single-Shot

filters afterwards as well.

3.

Press the LEARN button again to exit.

AUTOLEARN mode
This function is useful for automatically setting up Single-Shot

filters before the start of a live performance (“priming” the unit).
1.

Keep the LEARN button pressed for longer than one second.

Then, the following happens automatically:
s

The button LED blinks.

s

All Single-Shot filters and automatic filters are reset.

s

A time countdown runs in the display, from 16 seconds

to zero (L16, L15, ... , L 1, L 0).

The FBQ2496 creates impulses with a signal level of -15 dB

in order to provoke feedback. The overall amplification of

your FBQ2496 is incrementally increased from 0 dB to 15 dB).

The FEEDBACK DESTROYER PRO detects the critical

frequencies and lowers them in an extremely narrow-band

fashion.

2.

Critical frequencies are consecutively lowered and stored in

the storage slots of the Single-Shot filters.

3.

After the time had run out, the procedure is over. The LED

on the LEARN button is no longer lit and the display shows

run.

+

The frequency of the adjusted Single-Shot filters can not

be manually changed afterwards. However, minor

feedback frequency changes are implemented

automatically. Gain adjustment is also automatically

performed in the background, constantly adjusting to the

current conditions.

+

If a satisfactory setting for the Single-Shot and automatic

filters has been achieved, you can keep this setting by

pressing the FREEZE button. The display shows: -.

4. FBQ2496 FILTERS