9FEEDBACK DESTROYER PRO FBQ2496 User Manual

4.2Setting up parametric filters

Some or even all 40 filters on your FBQ2496 can be deployed as parametric filters. They have to be set up in a targeted fashion, with great precision. The frequency, bandwidth and gain parameters are available.

Selecting the number of parametric filters

1.Keep the PEQ button pressed for a few moments. The LED on the PEQ button blinks, and the display shows the current number of parametric filters (p 0 = no parametric filters deployed, P20 = all filters are parametric). Additionally, the LEDs on the deployed Single-Shot filters are lit.

2.You can use the wheel to change the number of parametric filters. The display shows the number of deployed parametric filters, and the corresponding LEDs in the status display ((8)) are lit.

3.Pressing the PEQ button again briefly completes the procedure.

•Now, the only parametric filters whose LEDs are still lit are those whose gain (either positive or negative) does not equal zero.

Setting up frequency, bandwidth, gain

You should implement the following procedure with each individual parametric filter:

1.Briefly press the PEQ button.

The LED on the PEQ button is lit. The display indicates the number of the selected filter (e.g. 19).

2.Use the wheel to select the parametric filter whose values you wish to modify.

◊Any filter may be selected using the wheel! However, the parameters of the Single-Shot and automatic filters can only be displays and can not be modified!

3.After you press the FREQUENCY button, use the wheel to set the filter mid frequency (the LED on the button blinks).

You can get a precise readout of the set mid frequency by observing the display and the status of the Hz/kHz LED next to it.

To modify exactly the frequency band you have in mind, you can shift the filter’s bandwidth.

4.Briefly press the BANDWIDTH button.

5.Turning the wheel changes the filter’s bandwidth. The 1/60 LED lights up if a value lower than 0.1 is set (1 x 1/60, 2 x 1/60 ... 5 x 1/60). In case of larger

bandwidths, the value is shown directly in the display (0.1, 0.2 ... 1.0,

1.1... 10.0).

A parametric filter becomes engaged only after an increase/decrease of the set frequency is entered:

6.Briefly press the GAIN button. The LED on the button is lit. At the same time, the dB LED under the 3-digit display is also lit.

7.The gain can be adjusted using the wheel. The available values range from 15 dB to - 36 dB (can be changed in 0.5-dB increments in the +15 dB to -15 dB range; in 1-dB increments in the -16 to -36 dB range). The value is shown in the display.

◊The FBQ2496 has a 3-digit display. Positive values are easily represented (14, 14.5, 15). For negative values, complete representation would require 4 digits. However, because the display only shows 3 digits, the position after the decimal point is omitted and replaced by a

dot to the right of the first two digits (-15, -14.(5), -14, -13.(5)), which stands for the missing decimal value.

8. Press the PEQ button briefly again to complete the procedure.

◊The status display only shows the filters whose gain does not equal to zero (either positive or negative).

4.3 Setting up automatic filters

The number of automatic filters can not be separately set. It results from the number of fixed and parametric filters (fig. 4.2).

◊To lower the number of automatic filters, increase the number of Single-Shot and/or parametric filters.

The automatic filters automatically spring into action on a per-need basis during a performance or a recording session. Of course, having the FBQ2496 react to changing situations would be desirable. To allow for this, you need to establish a setup in which the automatic filters are only periodically active, setting themselves back to zero afterwards in order to be ready for the next instance in which feedback is occurring.

The so-called “Filter Lifting Time” informs you about how long a filter set to automatic may remain active before its values are reset back to zero. This Filter Lifting Time can be set on the FBQ2496.

1.Press the FILTERLIFTbutton. The LED on the button starts to blink.

2.Using the wheel, Filter Lifting Time can either be turned off (OFF) or can be set to 1 min, 5 min, 10 min, 30 min or 60 min.

3.To exit this menu, press the FILTER LIFT button again. The LED no longer blinks.

4.If a Filter Lifting Time value has been set (i.e. any value other than OFF!), the button LED is lit.

◊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: -.