Changing Filter Parameters; Compressor (Compressor); Adjusting The Amplification (Gain); Level Limitation (Limiter) - IMG STAGE LINE DSM-240 Bedienungsanleitung

ƀ HighPass_1
(High Pass Filter 1)
high pass filter of first order with an attenua-
tion of 3 dB at the cut-off frequency and a
slope of 6 dB / octave
ƀ HighPass_2
(High Pass Filter 2)
high pass filter of second order with an atten-
uation of 3 dB at the cut-off frequency and a
slope of 12 dB / octave
ƀ HighPass_Q (High Pass Filter Q)
high pass filter with variable quality factor
ƅ All Pass_1 (All Pass Filter 1)
All pass filter with constant magnitude fre-
quency response and a phase shift of 90° for
the adjustable frequency.
ƅ All Pass_2
(All Pass Filter 2)
All pass filter with constant magnitude fre-
quency response and a phase shift of 180°
for the adjustable frequency.
Ƅ Band Pass
(Band Pass Filter)
band pass filter with a passband around the
adjustable frequency. The bandwidth is
defined by the adjustable quality factor.
Ƅ Notch Filt
(Notch Filter)
notch filter for narrow-band attenuation of the
level around the adjustable frequency.
The rate of the attenuation is defined by the
adjustable quality factor.

5.4.6.3 Changing filter parameters

1) Select an output with its button (10).
2) Use the rotary knob NAV/ PM1 to select the
EQ-1 EQ-7
desired filter ( to
with the button ENTER. The present adjust-
ment is shown, e. g.
Out-1 Low-A
ƊByp=Off Type=Peaking_Eq
3) Press the button ENTER. The present filter
parameters are now shown, e. g.
Ɗ 1000Hz +11.5dB Q=1.1
i. e. mid-frequency = 1000 Hz,
gain = 11.5 dB, filter quality factor = 1.1
Note: The availability of a parameter depends
on the filter type selected.
4) Adjust the frequency with the rotary knob
NAV/ PM1. A change is effective immediately.
For faster frequency changes, press the but-
ton ENTER. The lower line of the display now
shows e. g.:
ƊEdit Frequ = 1000Hz
The frequency can now purposefully be
changed with the rotary knobs NAV/ PM1 in
steps of 1000 Hz, PM2 in steps of 100 Hz and
PM3 in steps of 1 Hz. To return to the higher
menu level, press the button ESC.
5) Adjust the gain / attenuation with the rotary
knob PM2.
6) Adjust the filter quality factor with the rotary
knob PM3. A change is effective immediately.
To return to the next higher menu level, press
the button ESC. To exit the adjusting menu,
press the button ESC repeatedly or deselect the
output selected first.

5.4.7 Compressor (Compressor)

The compressor reduces the dynamic range and
attenuates the level above an adjustable thresh-
old. This is necessary if the dynamic range of the
audio signal is higher than allowed by the ampli-
fier system or the listening situation (e. g. in case
of background music). It is also possible to
reduce level differences (e. g. for changing
microphone distances) or to attenuate signal
peaks in order to allow a higher gain setting and
thus to obtain a higher average volume.
The compressor responds to the effective
value (RMS) of the signal. The activity of the
compressor is shown by the LED LIMIT of the
output indication (12). In addition, it is possible to
show the level reduction caused by the com-
pressor instead of the output level (
ter 5.4.11).
1) Select an output with its button (10).
2) The adjustments of the compressor are
divided into three menu items
Select the first of them with the rotary knob
NAV/ PM1 and confirm with the button
ENTER.
The present adjustment is shown, e. g.
Out-1
ƊBypass = Off
3) Use the rotary knob PM2 to define if the com-
pressor is to be used for this output
Bypass = Off
(
On
). A change is effective immediately.
4) Exit the submenu with the button ESC.
5) Use the rotary knob NAV/ PM1 to select the
next menu item and confirm with the button
ENTER.
The present adjustment is shown, e. g.
Out-1
ƊThr=+11.8dBu Rto=10:1
6) Use the rotary knob PM2 to adjust the thresh-
) and confirm old value. If this value is exceeded, the ampli-
fication is reduced. Use the control PM3 to
adjust the compression ratio. For example, a
compression ratio of
EQ-1 Ƅ
an input level increase of 20 dB above the
threshold value the output level will only be
increased by 2 dB.
7) Exit the submenu with the button ESC.
8) Use the rotary knob NAV/ PM1 to select the
next menu item and confirm with the button
ENTER.
The present adjustment is shown, e. g.
Out-1
ƊA= 50ms R=0.5s Kn= 00%
9) Use the rotary knob NAV/ PM1 to adjust the
attack time. Use the rotary knob PM2 to
adjust the release time, i. e. the time until the
amplification has reached its original value
again in case a level has fallen below the
threshold value. The control PM3 allows to
define if the change to compression is to be
made abruptly
a transition range
when the threshold value is exceeded. The
value defines the size of the transition range.
10) Exit the submenu with the button ESC.

5.4.8 Adjusting the amplification (Gain)

The level of an output signal may be adapted via
the adjustment of the gain in the range -12 dB
up to +6 dB. A level attenuation caused by the
compressor can thus partly be compensated.
1) Select an output with its button (10).
2) Select the menu item
knob NAV/ PM1 and confirm with the button
ENTER. The present adjustment is shown
ƊGain = 0.0dB
(e. g.
3) Adjust the desired gain with the rotary knob
PM2. A change is effective immediately.
4) Exit the submenu with the button ESC.
chap-
RMS Cmp.
Low-A RMS Cmp
Bypass =
) or bypassed (
Low-A RMS Cmp
10:1
means that with
Low-A RMS Cmp
Kn=00% (Hard Knee) or with
Kn=100%
(Soft Knee)
Gain
with the rotary
).

5.4.9 Level limitation (Limiter)

The limiter allows to quickly limit the signal to an
adjusted level. Thus, the power amplifiers are
protected against overload and the speakers are
protected against damage. It operates similar to
the compressor described before. However,
while the compressor still allows an increase of
the output level depending on the compression
rate adjusted, the threshold value of the limiter
defines the absolute upper limit of the output sig-
nal (compression ratio = ∞ : 1).
The limiter responds to the peak values of
the signals. The activity of the limiter is shown by
the LED LIMIT of the output indication (12). In
addition, it is possible to show the level reduction
caused by the limiter instead of the output level
( chapter 5.4.11).
1) Select an output with its button (10).
2) The adjustments of the limiter are divided into
Limiter
two menu items . Select the first of
them with the rotary knob NAV/ PM1 and con-
firm with the button ENTER.
The present adjustment is shown, e. g.
Out-1 Low-A Limiter
ƊBypass = Off
3) Use the rotary knob PM2 to define if the lim-
iter is to be used for this output (
Off ) or bypassed ( Bypass = On
change is effective immediately.
4) Exit the submenu with the button ESC.
5) Use the rotary knob NAV/ PM1 to select the
next menu item and confirm with the button
ENTER.
The present adjustment is shown, e. g.
Out-1 Low-A Limiter
ƊA= 50ms R=0.5s +10.4dBu
6) Use the rotary knob NAV/PM1 to adjust the
attack time, and the rotary knob PM2 to
adjust the release time, i.e. the time until the
amplification has reached its original value
again if the level has fallen below the thresh-
old value. Use the rotary knob PM3 to adjust
the threshold value, i. e. the output level
admitted as a maximum. If this value is
exceeded, the amplification is reduced.
7) Exit the submenu with the button ESC.

5.4.10 Phase reversal (Polarity)

The signal of an output may be inverted (phase
reversal), e. g. to balance a reverse polarity
when connecting the speakers.
1) Select an output with its button (10).
2) Use the rotary knob NAV/ PM1 to select the
Polarity
menu item and confirm with the
button ENTER.
The present adjustment is shown, e. g.
ƊPolarity = Normal
3) Use the rotary knob PM2 to define if the out-
put signal is to be inverted (
Invert Polarity = Normal
) or not (
A change is effective immediately.
4) Exit the submenu with the button ESC.
GB
Bypass =
). A
Polarity =
).
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