Behringer Ultragraph Digital DEQ1024 Owner's Manual

ULTRAGRAPH DIGITAL DEQ1024

Deactivating the search function (feedback suppression

remains active):
If you now press the ON/OFF switch for a second time, the feedback analysis

stops. Those frequencies emitting feedback will continue being lowered

(RESET (HOLD) LED is still on). This procedure is well suited for stationary

microphones, such as drum microphones. To start the “hunt” for feedback

again, hit the ON/OFF switch once again.
Displaying the feedback frequencies:
If you briefly (for approx. 2 seconds) depress the RESET (HOLD) switch,

the feedback frequencies that the DEQ1024 was able to find will be indicated

on the respective fader LEDs. If no feedback occurs, the LEDs will stop being

lit up for roughly 2 seconds.
Deactivating the FEEDBACK DESTROYER:
If you hold the RESET (HOLD) switch depressed for a few seconds, the filter

settings are reset (RESET (HOLD) LED dies out) and the FEEDBACK DESTROYER

is deactivated.

(4)

If you press the FB INDICATOR switch (green switch LED lights up), the FBQ

feedback detection system is activated. The frequency (or the frequencies)

that cause feedback are now shown in the form of a brightly shining fader

LED. All other LEDs are dimmed. Simply lower somewhat the pertinent

frequency range until feedback is no longer present and the LED dies out.
By displaying the intensity of individual frequency ranges, the feedback

recognition system also functions as an audio analyzer.

◊

Please keep in mind that the FB INDICATOR only shows the intensity of
the individual frequency bands. Not every frequency that is present
automatically causes feedback.

◊

FEEDBACK DESTROYER and FB INDICATOR function independently from
one another and can be activated simultaneously. Please bear in mind:
when in 96-kHz mode, FEEDBACK DESTROYER and FB INDICATOR are
not available!

(5)

When you keep the PINK NOISE switch depressed for a few seconds,

the internal pink noise generator of your DEQ1024 is activated (red switch

LED lights up) and the volume level of the test signal is gradually increased

as long as the switch remains depressed (the level is shown on LEVEL

METER (13)). Briefly pressing the PINK NOISE switch once again deactivates

the function.
PINK NOISE
Room resonance and the transmission characteristics of your P.A. system

naturally lift certain frequencies while lowering others. Pink noise is

a neutral signal that can be played back over the P.A. system in order

to measure these room characteristics. One such measurement of the

frequency response with a special measurement microphone (e. g.

BEHRINGER ECM8000) coupled to a real-time analyzer (integrated in the

BEHRINGER ULTRACURVE PRO DEQ2496) delivers the foundation for setting

up the equalizer. Boosted frequencies can be lowered by means of your

equalizer, while frequencies that are too weak can be boosted, and a nearly

linear playback is achieved.

◊

Try to orient yourself on a frequency whose signal level lies in the 0 dB
to -3 dB range in order to avoid overdriving the equipment connected
(e. g. amp, crossover).

(6)

In the world of ordinary graphic equalizers, there is always a difference

between the adjusted curve and the resulting frequency response.

This phenomenon is simply caused by the construction of such equalizers.

This difference depends on the frequency and its cut/boost. Near-by

frequency bands influence one another, whereby individual instances of cut

or boost can also be added up to one another.

Fig. 2.2: Graphic equalizer without frequency response correction

This occurrence can be corrected by means of a specially developed

algorithm utilized in the ULTRAGRAPH DIGITAL DEQ1024. Simply press the

TRUE CURVE switch (green switch LED lights up).

Fig. 2.3: Graphic equalizer with frequency response correction (TRUE CURVE)

The resulting frequency response now corresponds exactly to the settings

that you adjusted with the graphic equalizer.

(7)

The BYPASS switch lets you directly compare the processed and

unprocessed audio program. When the BYPASS function is activated

(red switch LED lights up), the input of the unit is directly forwarded to the

output so you can monitor the unprocessed signal.

(8)

The DYNAMICS section of the DEQ1024 consists of a GATE and a LIMITER.

Use the GATE and LIMITER controls to determine the threshold. When the

threshold is exceeded (LIMITER) or when the signal falls below the threshold

(GATE), the dynamic processors starts affecting the signal.
GATE
When the input signal falls below the threshold value, the signal is

completely faded out. Tape hiss, crosstalk or disturbing noise can thus be

effectively removed from the signal. The yellow GATE LED in the METER

section (see (13)) lights up as soon as the GATE closes. The range of the

threshold lies between -60 and -10 dB. When turned all the way to the left,

the GATE is deactivated (OFF).
LIMITER
The LIMITER protects your equipment from signal peaks that could for

example damage your speakers. Output signal levels that exceed the

selected threshold value are limited, and the red LIMITER LED in the METER

section (see (13)) lights up. By reducing signal dynamics, a more expressive

sound is achieved. The threshold range lies between -6 and +9 dB. When

turned all the way to the right, the LIMITER is deactivated (OFF).

◊

Please keep in mind that boosting many frequency bands also increases
the output signal level. In this case, the limiter is activated sooner.
You can avoid this by achieving signal correction not only by boosting
frequency bands but by also lowering signal levels. To achieve creative
sound effects, the peak limiter can deliberately be driven to its limits.