2
FRONT PANEL FEATURES
S
LR LR
power
87654321
channels
87654321
inputs
IWA 250 Powered Mixer
main equalizer
63 125 250 500 1k 2k 4k 8k 16k
aux
main
high
low
aux
main
high
low
aux
main
high
low
aux
main
high
low
aux
main
high
low
aux
main
high
low
aux
main
high
low
aux
min
max
min
max
-12
+12
-12
+12
min
max
min
max
-12
+12
-12
+12
min
max
min
max
-12
+12
-12
+12
min
max
min
max
-12
+12
-12
+12
min
max
min
max
-12
+12
-12
+12
min
max
min
max
-12
+12
-12
+12
min
max
min
max
-12
+12
-12
+12
min
max
min
max
min
max
min
max
min
max
min
max
-12
+12
+15
-15
+15
-15
-12
+12
line
mic
line
mic
line
mic
line
mic
line
mic
line
mic
main
high
low
gain gain gain gain gaingain
peak peak peak peak peak peak peak peak peak
active
main out
main EQ in
common
aux
main
aux
out
main
out
aux
out
override
input
main
out
OFF
HPF
OVERRIDE
ON
AUTO MANUAL
OFF
L / R Sum
20dB Pad
ON
OFF ON
OFF
L / R Sum
20dB Pad
ON
OFF ON
OFF
OFF
Phantom Power
OFF
OFF
Phantom Power
OFF
OFF
Phantom Power
U
L
R
CUS
52SJ
LISTED
120V
~
60Hz
900 Watts
Aux: These screw-driver controls set the level of channel
signals sent to the Aux Out master control. Aux controls are
used to create an independent mix of channel signals for a
secondary sound system. This mix is sent (via the Aux Out
master control) to the Aux Out connector (see below).
Main: These screw-driver controls set the level of channel
signals sent to the Main Out master control. Main controls are
used to create an independent mix of channel signals for the
primary sound system. This mix is sent (via the Main Out
master control) to the Main Equalizer and Main Amplifier, as well
as to the Main Out connector (see below).
High: These screw-driver controls set the high-frequency
equalization (Treble) for the channels. High equalization is a
shelving type filter, which provides ±12dB of gain adjustment for
frequencies above 10kHz. Equalization is used to compensate
for tonal differences which may exist between various input
signals.
Low: These screw-driver controls set the low-frequency
equalization (Bass) for the channels. Low equalization is a
shelving type filter, which provides ±12dB of gain adjustment for
frequencies below 50Hz. Equalization is used to compensate
for tonal differences which may exist between various input
signals.
Gain (Channels 1~6): These screw-driver controls set the
channel gain (0~60dB) to compensate for different input signal
levels. Adjust these controls so the channel Peak indictors flash
only on occasional peaks (see below).
L / R Sum (Channels 7 & 8): These DIP switches convert the
the balanced mono inputs to unbalanced stereo (L/R) summing
inputs. Use L / R Sum whenever input is from an unbalanced
stereo program source (i.e. CD player, tape deck, etc.).
20dB Pad (Channels 7 & 8): These DIP switches reduce input
gain by 20dB to compensate for higher level input signals. Use
20dB Pad whenever input signal levels cause the channel Peak
indicator to light more often than just on occasional peaks.
Peak: These red LEDs will light whenever channel signal levels
reach +10dB (8dB below clipping). Use this feature to aid in
proper adjustment of Gain and 20dB Pad (see above).
Phantom Power: These DIP switches assign +48 Volt DC to
the respective inputs for powering condenser microphones.
Phantom Power should remain off when input is from line-level
sources or dynamic microphones. Always turn AC power off, or
turn all level controls down, before switching Phantom Power.
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