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ULTRACURVE PRO DEQ2496
3. MENU STRUCTURE AND EDITING
The high-shelving filter, on the other hand, raises
(positive gain) or lowers (negative gain) the level of the
frequency band above the adjusted frequency.
The band-pass filter raises or lowers the level of the
frequency range
around the center frequency.
The GAIN and BW(OCT) values can be reset by pressing the
large data wheel.
In this menu too, the A keys selects the left and right-channel
signals. If STEREO LINK modes has been selected in the UTILITIES
menu (chapter 3.5), the parameter values refer to both sides.
+ At least one filter must be activated on page 2 to
be able to recall the first page of the PEQ menu.
3.2.3 DEQ menu
Press the DEQ key to select the DEQ menu. Due to their
complexity, the Dynamic EQs have their parameters split up on
three pages.
Explanation:
A Dynamic EQ influences a defined frequency range of
a signal, based on the volume level. It can either raise or
lower the level of a specific frequency, depending on
the GAIN setting chosen by the user.
When the GAIN setting selected causes the frequency
range to be lowered in level, and when the signal
exceeds a pre-defined THRESHOLD, the EQ starts
processing the sound and cuts the level of the respective
frequency range. The amount of attenuation applied is
determined by the RATIO parameter. When the signal
drops below the THRESHOLD, the frequency range is
smoothed out again, i.e. the Dynamic EQ stops
processing the frequency range.
When the GAIN setting selected causes the frequency
range to be raised in level, this boost depends on the
volume level. As soon as the level of the selected
frequency range drops below a pre-defined THRESHOLD,
this results in a signal boost determined by the RATIO
parameter. If the signal exceeds the threshold again,
the Dynamic EQ stops processing the sound.
On pages 1 and 2 of the DEQ menu you can adjust the necessary
settings to determine the threshold and the way of sound
processing. Additionally, you will find a graphic representation of
the control curve with regard to THRESHOLD, GAIN and RATIO. In
the center of the display, the LEVEL meter (left) indicates the
filtered DEQ input level (control signal), while the GAIN meter (right)
shows how much boost/cut is applied to the signal.
Page 3 includes a frequency diagram showing the filter curves
with regard to frequency and threshold. The current DEQ input
level can be seen from the LEVEL meter on the right.
Fig. 3.4: DEQ menu (page 1)
The make-up gain parameter M-GAIN on page 1 allows you to
set the amount of boost/cut for the filter with the upper data
wheel. The setting range is from -15 to +15 dB. THRESHOLD
(large data wheel) defines the threshold as of which the filter
function is activated. If the filter has been set to attenuate the
signal (M-GAIN < 0), then the desired frequency range (see
page 3) will be lowered in level as soon as it exceeds the
threshold. If boost is required (M-GAIN > 0), the frequency range
will be raised in level as soon as the signal drops below the
threshold. The RATIO parameter (lower data wheel) determines
the amount of boost/cut applied to the respective frequency
range, if the signal exceeds or drops below the threshold. The
setting range is from 1:2 to 1:100.
Fig. 3.5: DEQ menu (page 2)
On the second page of the DEQ menu (accessed by pressing
the DEQ or PAGE key), you can define two additional dynamics
parameters.
ATTACK (upper data wheel) determines how fast the dynamic
EQ starts processing when the signal exceeds or drops below
the threshold. The ATTACK times available range from 0 to 200
milliseconds. Press this control to select a coarse or fine
adjustment scale.
The RELEASE parameter (lower data wheel) lets you adjust
the time needed by the EQ to release the sound after the signal
has exceeded or dropped below threshold (depending on the
GAIN setting). The RELEASE times available range from 20 to
4,000 milliseconds. Here, too, you can press the control to select
a coarse or fine adjustment scale.
It is on this page that you can also edit the THRESHOLD value
(large data wheel), so as to be able to make some readjustments
without having to change to another page.
Fig. 3.6: DEQ menu (page 3)
As mentioned before, page 3 includes a frequency diagram
and the gain reduction meter. MODE (upper data wheel) defines
the filter type, and you can choose from high-shelving, low-
shelving and band-pass filters.
The FREQUENCY parameter determines the center frequency
of the filter (large data wheel). In the case of low-shelving and
high-shelving filters, this is the cut-off frequency as of which
the low or high frequencies are processed. The entire frequency
spectrum ranges from 20 to 20,000 Hz. Press the data wheel to
select a coarse (1/6 oct. per step) or fine adjustment scale
(1/60 oct. per step).
If you selected bandpass under MODE, the parameter
BW(OCT) appears in the lower right part of the display. Here,
you can use the lower data wheel to adjust the bandwidth of
your choice and thus determine the width of the filter curve
(1/10 oct. to 10 oct.).
The B key selects which of the dynamic EQs is displayed.
Three EQs are available for each stereo side. Keep the key
pressed to reset the settings of the currently selected DEQ.
This table shows an example with extreme settings, thus
illustrating how a dynamic EQ works:
BP
1.00 kHz
+15 dB > continuous line
0 dB > broken line
-15 dB > dotted line
0.1
-40 dB
1:100
Tab. 3.1: Bandpass with extreme settings (see also fig. 3.7)