Biamp IWA 250 User Manual
CAUTION: These installation instructions are for use by qualified service personnel only.
To reduce the risk of electric shock, do not perform any servicing other than that contained
in the operating instructions unless you are qualified to do so.
IWA 250
In-Wall Powered Mixer
Installation Instructions
Biamp Systems | 9300 S.W. Gemini Drive | Beaverton, OR | 97008 | USA | +1.503.641.7287 | www.biamp.com
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5Jul06
TABLE OF CONTENTS
Front Panel Features
Installation
Remote Control
Applications
Specifications & Block Diagram
Warranty
IWA 250
INTRODUCTION
The IWA 250 In-Wall Powered Mixer provides an 8 input/2 output mixer plus
pg. 2
emergency page interrupt, a 9-band graphic equalizer, and a 250 Watt power
amplifier with outputs for standard and distributed speaker systems. Optional
pg. 4
VCA remote control cards may be added for controlling mixer input/output
levels. Designed for in-wall or surface mounting, with integral security cover,
pg. 8
the IWA250 is UL/C-UL listed and is covered by a five-year warranty.
pg. 10
pg. 12
• six balanced microphone/line level mixer input channels
• two balanced/summing line level mixer input channels
• high & low tone controls on each mixer input channel
• independent main & aux level controls on each channel
• trim control & peak indicator on each mic/line input channel
• additional balanced line input for emergency page interrupt
• main & aux mixer outputs with master level controls
• mixer functions provided on screw-driver adjustable controls
• optional VCA cards for remote control of input/output levels
• 9-band graphic equalization integrated at amplifier input
• patch points provided for mixer outputs & equalizer input
• mixer inputs & outputs on front panel plug-in barrier strips
• output taps for standard and distributed speaker systems
• +48 Volt phantom power selectable for microphone inputs
• "in-wall" or "surface-mount" chassis with security cover
• UL and C-UL listed
• covered by Biamp Systems' five-year warranty
IMPORTANT SAFETY INFORMATION
Read these instructions.
Keep these instructions.
Heed all warnings.
Follow all instructions.
Do not use this apparatus near water.
Clean only with a dry cloth.
Do not block any of the ventilation openings.
Install in accordance with the manufacturers instructions.
WARNING - To reduce the risk of electric shock, do not expose
this apparatus to rain or moisture.
Unplug this apparatus during lightning storms or when unused
for long periods of time.
Apparatus shall not be exposed to dripping or splashing and no
objects filled with liquids, such as vases, shall be placed on the
apparatus.
Explanation of safety related markings and symbols which appear on the outside of the apparatus.
Lightning Bolt
symbol while the unit is connected to live power.
Exclamation Point
compromise safe operation of this unit.
CAUTION
RISK OF ELECTRICAL SHOCK.
DO NOT OPEN.
: Hazardous Live voltages present when this unit is in operation. Do not touch terminals marked with this
: Replace components (i.e. fuses) only with the values specified by the manufacturer. Failure to do so will
CAUTION
: Opening the unit enclosure will place operator at risk of injury due to electric shock.
Do not install near any heat sources such as radiators, heat
registers, stoves, or other apparatus (including amplifiers) that
produce heat.
Do not defeat the safety purpose of the polarized or groundingtype plug. A polarized plug has two blades with one wider than
the other. A grounding type plug has two blades and a third
grounding prong. The wide blade or the third prong are provided
for your safety. When the provided plug does not fit into your
outlet, consult an electrician for replacement of the obsolete
outlet.
Protect the power cord from being walked on or pinched
particularly at plugs, convenience receptacles, and the point
where they exit from the apparatus.
Refer all servicing to qualified service personnel. Servicing is
required when the apparatus has been damaged in any way,
such as power-supply cord or plug is damaged, liquid has been
spilled or objects have fallen into the apparatus, the apparatus
has been exposed to rain or moisture, does not operate
normally, or has been dropped.
1
FRONT PANEL FEATURES
channels
87654321
max
max
+12
+12
mic
OFF
OFF
Phantom Power
aux
min
main
min
high
-12
low
-12
gain gain gain gain gaingain
line
aux
min
main
min
high
-12
low
-12
line
peak peak peak peak peak peak peak peak peak
max
max
+12
+12
mic
aux
min
main
min
high
-12
low
-12
line
max
max
+12
+12
mic
OFF
OFF
Phantom Power
aux
min
main
min
high
-12
low
-12
line
inputs
max
max
+12
+12
mic
aux
min
main
min
high
-12
low
-12
line
max
max
+12
+12
mic
OFF
OFF
Phantom Power
aux
min
main
min
high
-12
low
-12
line
max
max
+12
+12
mic
min
min
-12
-12
OFF
OFF ON
aux
main
high
low
L / R Sum
20dB Pad
LR LR
max
max
+12
+12
ON
aux
max
min
main
max
min
high
+12
-12
low
+12
-12
L / R Sum
OFF
OFF ON
20dB Pad
87654321
ON
U
CUS
R
L
LISTED
52SJ
120V
60Hz
900 Watts
main equalizer
power
+15
-15
63 125 250 500 1k 2k 4k 8k 16k
IWA 250 Powered Mixer
HPF
OFF
aux
max
min
main
max
min
active
override
input
AUTO MANUAL
aux
out
min
S
aux
out
OVERRIDE
max
ON
main
min
main
out
out
max
~
main out
main EQ in
common
+15
-15
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.
2
FRONT PANEL FEATURES
Inputs (Channels 1~6): These plug-in barrier strips provide
mic/line input to Channels 1~6. These inputs accept signals
from balanced low-impedance microphones or from balanced
(or unbalanced) line-level sources. Balanced input (Mic or Line)
d
is wired high to (+), low to (-), and ground to (
Line input is wired high to (+), and ground to both (-) and (
Phantom Power (+48V) is selectable per input (see above) and
remote level control is optional (see pg. 8).
Inputs (Channels 7 & 8): These plug-in barrier strips provide
line level input to Channels 7 & 8. These inputs accept mono
(balanced or unbalanced) or stereo (unbalanced) signals from
line-level sources (see L/R Sum above). Balanced mono input
is wired high to (+), low to (-), and ground to (
mono input is wired high to (+), and ground to both (-) and (
Unbalanced stereo input is wired left high to (L), right high to
d
(R), and both grounds to (
). Stereo signals are summed
together into a mono signal at this input. Two independent
mono signals may be connected here (wired to left & right
respectively), which will be summed together providing common
channel equalization and level controls. Remote level control is
optional (see pg. 8).
Override Input: This plug-in barrier strip provides the line level
override input. This inputs accepts mono (balanced or
unbalanced) signals from line-level sources. Balanced input is
wired high to (+), low to (-), and ground to (
input is wired high to (+), and ground to both (-) and (
Override Input channel includes the same Main & Aux level
controls as all other inputs. However, there is no input Gain
control. Therefore, input level must be adjusted at the override
source. For best performance, adjust the override source level
so the channel Peak indictor flashes only on occasional peaks
(see Peak above). The Override Input can trigger muting of all
other input signals either manually (via external switch) or
automatically (via signal presence), regardless of Main or Aux
level settings (see Override below). For manual muting (as from
a push-to-talk paging microphone) the switch is wired across the
d
Override Input (S) and (
) terminals. For automatic muting (as
from telephone paging), an Override Sensitivity adjustment must
be made (see pg. 8). The green Active LED indicator will
remain lit during either form of Override muting.
Main Out: The Main Out screw-driver control sets the overall
level of signals sent (from channel Main controls) to the Main
Out connector. The Main Out connector is a plug-in barrier
strip, which provides a balanced line-level output for feeding
external equipment (recorders, auxiliary amplifiers, etc.). For
unbalanced output, wire high to (+) and ground to (
) un-connected. An additional plug-in barrier strip connector (to
the right of Main Out) provides unbalanced access to the mixer
Main Out, and to the Main Equalizer input. From the factory, a
jumper wire between "Main Out" and "Main EQ In" routes signal
from the Main Out control to the Main Equalizer and the Main
Amplifier. Signal processing may be inserted between the mixer
and the equalizer by first removing the jumper wire, then wiring
"Main Out" to processor input and "main EQ In" to processor
). Unbalanced
d
). Unbalanced
d
). Unbalanced
d
). The
d
), leaving (-
d
).
d
).
d
output, using a common ground (
). To access unbalanced
Main Out from the mixer (to feed recorders, auxiliary amps, etc.)
d
wire high to "Main Out" and ground to (
), without removing the
jumper wire. NOTE: If the jumper is removed, the main output
and equalizer input are separated (no signal passes between
them). Remote level control is optional (see pg. 8).
Aux Out: The Aux Out screw-driver control sets the overall
level of signals sent (from channel Aux controls) to the Aux Out
connector. The Aux Out connector is a plug-in barrier strip,
which provides a balanced line-level output for feeding external
equipment (recorders, auxiliary amplifiers, etc.). For
d
unbalanced output, wire high to (+) and ground to (
), leaving (-
) un-connected. Remote level control is optional (see pg. 8).
HPF: This DIP switch enables a high-pass filter (12dB/octave
@ 125Hz) which reduces unnecessary low-frequency signals.
Enable HPF whenever the 70V or 25V outputs are being used,
or in any 'speech only' applications.
Override: This DIP switch determines whether the Override
Input will trigger muting of all other input signals automatically
(via signal presence) or manually (via external switch).
Main Equalizer: This 9-band graphic equalizer adjusts the
frequency response (tonal balance) of signals sent to the Main
Amplifier. Each control provides ±15dB boost/cut at the
designated center frequency. From the factory, the Main
Equalizer receives signal from the mixer Main Out. However,
the Main Equalizer may instead be wired to receive signal from
another source (see Main Out above). Do not boost frequencies
below 250Hz whenever the 70V or 25V outputs are being used.
Power Switch: This switch applies power to the unit. Caution:
complete all connections & installation before turning power on.
Power Indicator (not shown): This green LED lights when
power is applied to the IWA 250.
Temp/Fault Indicator (not shown): This red LED indicates
over-temperature and output fault conditions for the amplifier.
When the LED remains lit, the amplifier has an overtemperature condition. When the LED is flashing, the amplifier
has an output fault condition. Either condition will temporarily
de-activate the amplifier, causing the Signal/Peak LED to turn
off as well. The amplifier will attempt to self-reset once the overtemperature or output fault condition is resolved.
Signal/Clip Indicator (not shown): This 2-color LED indicates
the signal level for the amplifier. When the LED is green, the
amplifier has signal (above -30dB). When the LED is red, the
amplifier signal is clipping (max. power). CAUTION: Signal
levels should be adjusted to avoid clipping. Clipping can cause
distortion, over-temperature conditions, and even loudspeaker
damage. NOTE: Signal/Peak indicators will turn off during
Temp/Fault conditions (see Temp/Fault Indicator above).
3
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