INSTRUCTION MANUAL
CXA160 / CXA80
Integrated Amplifiers
FEATURES
ꢀ. INTRODUCTION
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Line input with combination XLR/TRS connector, euro
connector, and screw terminals
The CXA160 and CXA80 amplifiers are designed for
continuous duty in speech, music, paging and sound
reinforcement applications in churches, schools, offices,
arenas, hotel meeting rooms, convention centers, recreation
facilities and other venues demanding high performance,
flexible features and rugged dependability.
Priority mic/line input with combination XLR/TRS
connector, euro connector, and screw terminals
Parallel output (switch defeatable) for daisy-chaining
input signal to other amplifiers or parts of your system
(XLR, TRS, euro connector, and screw terminals)
The CXA160 has a 160 watt power amplifier, and the
CXA80 has 80 watts. Apart from this difference in power
output, the two models are identical in details and operation.
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Input is switch-configurable for parallel output on/off,
high pass filter on/off, and 10 dB pad in/out
The main line-level input is actively balanced, with a
sensitivity control and selection switches for enabling the
parallel output, a 10 dB pad, and high-pass filtering. The input
and priority input have XLR, TRS, screw-terminal and Phoenix
euroblock connectors.
Priority input is switch-configurable for mic or line,
phantom power on/off, high pass filter on/off, and 10
dB pad in/out
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•
Priority terminals for manual ducking of main input, as
well as automatic ducking when priority signal present
The priority input is actively balanced, with a sensitivity
control and selection switches for line-level input, mic-level
input, mic-level input with 24 VDC phantom power, 10 dB pad,
and high-pass filtering.
Trim control and level-setting LED on input and priority
input
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Front panel EQ adjustment of bass and treble
Front panel master level control
When an audio signal greater than -20 dB is present at the
priority input, or when an external priority switch is pressed,
the main input is automatically muted, and the priority input
will play.
Front panel overload, signal, fault and power-on LEDs
Front panel power switch
A parallel output allows the line-level input signal to be
daisy-chained to feed other amplifiers or parts of your system.
External volume control (with user-supplied 10k pot)
External fault relay terminals
Output modes include 4 ohm constant impedance, and
constant voltage 25 V, 70 V and 100 V. The smart output
stage is fully protected against permanent damage caused by
overloading, shorts, and extreme temperatures.
CXA160: 160 watt rms, convection cooled
CXA80: 80 watt rms, convection cooled
4 ohm - 25 V - 70 V - 100 V screw terminal outputs
Global high-pass filter
The universal power supply will operate from 100 VAC to
240 VAC, 50/60Hz, supplied by a detachable IEC power cord.
Rear panel terminals are provided for connecting an
external 24 VDC backup battery, with automatic switching if
the AC mains fails.
Universal power supply, 100 VAC–240 VAC, 50–60 Hz
Automatic switching to 24 VDC backup power input
2 RU rack-mountable
The front panel provides power on/off, a master volume
control, and bass and treble controls. Status LEDs indicate
signal present, signal overload, fault and power on.
APPLICATIONS
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Foreground/background music systems
Paging systems
Continuous-duty applications
Sound reinforcement systems
CXA160 / CXA80 – 3
3. FRONT PANEL FEATURES
1. EQ-LOW
4. STATUS LEDS
These LEDs show:
OVERLOAD (RED)
Turn this clockwise to boost the level of the low-frequency
range below 100 Hz. Turn it counter-clockwise to cut the
level. In the detented center position, there is no change in
level. The maximum boost and cut is 12 dB.
SIGNAL PRESENT (AMBER)
FAULT (RED)
ꢀ. EQ-HIGH
POWER ON (GREEN)
Turn this clockwise to boost the level of the high-frequency
range above 10 kHz. Turn it counter-clockwise to cut the
level. In the detented center position, there is no change in
level. The maximum boost and cut is 12 dB.
5. POWER
Use this switch to turn the unit on or off. The power is on
when the top of the switch is pressed, and off when the
bottom is pressed. Turn it off if you are not using the unit
for long periods of time.
3. VOLUME
Use this volume control to adjust the sound output level to
your speakers.
5
1
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3 4
4 – CXA160 / CXA80
4. REAR PANEL FEATURES
10. Input DIP switch
This three-pole DIP-switch allows you to configure all four
input types, as shown in this table and the details below.
9
6
7
10
DIP # Purpose
DOWN
OFF
UP
8
1
2
3
Parallel Enable
Enabled
OFF
High Pass Filter
Enabled
OFF
–10 dB Pad Enable
Enabled
INPUT CONNECTORS
DIP switch details:
The Input section has four different styles of input
connections for line-level audio signals. Choose one which
suits your system the best:
1. Parallel Enable. Select UP if you want there to be
an output from the Parallel Output. This allows you
to send a line-level copy of the audio input signals
to other components or amplifiers in your system.
Select DOWN if you are not using the Parallel
Outputs.
6. Combination XLR/TRS connector. This
can accept a male balanced XLR connector, a
balanced TRS or unbalanced TS 1/4" connector.
7. Phoenix (Euroblock) connector. This
three-pin connector accepts the positive, negative
and ground terminals of a balanced audio line. It
accepts a push-in connector for easy installation.
2. High-pass filter enable. The default position is
enabled (DOWN). This rolls off the low frequencies
below 120 Hz, at a rate of 12 dB per octave. Use
this to reduce low frequencies, such as from low
bass notes, microphone handling and stage noise.
It is useful when using smaller speakers that do
not reproduce the low frequencies well.
8. Terminal strip. This three-terminal connector
accepts the positive, negative and ground
terminals of a balanced audio line. Secure the
connections with the screws.
3. 10 dB pad enable. Select UP to reduce the input
level by 10 dB.
Each input style is designed to accept balanced or
unbalanced line-level signals. The input can be configured
by means of the DIP-switch (see below).
9. GAIN pot and OL (overload) LED
This screwdriver-adjustable rotary potentiometer acts as a
trim control, and a red indicator LED will light 3 dB before
clipping. With normal source material playing, adjust the
pot until the LED lights only occasionally during the loudest
moments of your program.
CXA160 / CXA80 – 5
15. Priority DIP switch
This five-pole DIP-switch allows you to configure all four
priority input types, as shown in this table and described
below.
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11
1ꢀ
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15
DIP # Purpose
DOWN
Line Level
Line Level
OFF
UP
1
2
3
4
5
Mic/Line
Mic Level
Mic Level
Enabled
OFF
16
Mic/Line
PRIORITY CONNECTORS
24 V Phantom
High Pass Filter
–10 dB Pad Enable
Enabled
OFF
When a signal above –20 dB is detected at the priority
input, the main input is muted. This is useful for
making announcements, as the music program is then
automatically muted. This muting can also be accomplished
manually by connecting a user-supplied, normally open, dry
contact closure switch to the priority screw terminals.
Enabled
DIP switch details:
1. Mic/line (line-level is default). Select UP if using
a microphone, or DOWN if it is a line-level input
such as from a CD or DVD player. Note: You must
always set DIP 2 to the same setting as DIP 1.
The Priority input has four different styles of input
connections for microphone-level or line-level audio
signals. Choose one which suits your system the best:
2. Mic/Line. Set this to whatever DIP 1 is set to. See
above for details.
11. Combination XLR/TRS connector. This
can accept a male balanced XLR connector, a
balanced TRS or unbalanced TS 1/4" connector.
3. Phantom Power. Select UP if using a microphone
that requires phantom power, otherwise, it is
important to keep this DOWN.
12. Phoenix (Euroblock) connector. This
three-pin connector accepts the positive, negative
and ground terminals of a balanced audio line. It
accepts a push-in connector for easy installation.
4. High-pass filter enable. The default position is
enabled (DOWN). This rolls off the low frequencies
below 120 Hz, at a rate of 12 dB per octave. Use
this to reduce low frequencies, such as from low
bass notes, microphone handling and stage noise.
It is useful when using smaller speakers that do
not reproduce the low frequencies well.
13. Terminal strip. The three-terminal connectors
labeled +, –, and GND, accept the positive,
negative and ground terminals of a balanced audio
line. Secure the connections with the screws.
Each priority input style is designed to accept balanced
or unbalanced microphone-level, or line-level signals. The
priority input can be configured by means of the DIP-switch
(see below).
5. 10 dB pad enable. Select UP to reduce the input
level by 10 dB.
16. Priority Terminals
Priority functions can be initiated by a user-supplied,
normally open, dry contact closure switch (or switches)
connected to the terminal strip (PRI GND, PRI 1).
14. GAIN pot and OL (overload) LED
This screwdriver-adjustable rotary potentiometer acts as a
trim control, and a red indicator LED will light 3 dB before
clipping. With normal priority source material playing,
adjust the pot until the LED lights only occasionally during
the loudest moments of your program.
Connecting one leg of the switch to the PRI GND screw
and the other side to PRI 1 prepares the circuit. Closing the
switch actuates the specific priority, allowing the priority
input to play.
6 – CXA160 / CXA80
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ꢀꢀ ꢀ3
PARALLEL OUTPUT CONNECTORS
ꢀ1. Low Cut Filter
These outputs allow you to send a copy of the input signals
to another amplifier or component in your system. The
output is not affected by the volume or EQ controls.
Press this button in to engage the low-cut filter on the
output of the amplifier. It is fixed at 100 Hz with a 12 dB
slope per octave, and it serves to minimize transformer
saturation in constant voltage systems. Frequencies below
100 Hz are attenuated at a rate of 12 dB per octave.
There will only be an output here if the Input DIP switch Pin
1 is set in the UP position (see page 5 for details).
The output has four different styles of connections. Choose
one that suits your system the best:
ꢀꢀ. External Volume Control
17. XLR connector. This can accept a female
This terminal is provided for remote volume control. If you
connect a (user-supplied linear-taper 10K pot), you can
remotely control the volume of the amplifier in the same
way that the front panel volume control does.
balanced XLR connector.
18.TRS connector. This can accept a balanced
TRS or unbalanced TS 1/4" connector.
19. Phoenix (Euroblock) connector. This
three-pin connector accepts the positive, negative
and ground terminals of a balanced audio line. It
accepts a push-in connector for easy installation.
ꢀ3. Fault Relay
If a fault is detected in the amplifier section, the positive
terminal of this external connector is energized. This
external connector can be used to connect to an external
device to initiate a “fault” action as dictated by the user.
Additionally, the “fault” LED on the front of the amplifier is
lit.
20. Terminal strip. The three-terminal connectors
labeled +, –, and GND, accept the positive,
negative and ground terminals of a balanced audio
line. Secure the connections with the screws.
CXA160 / CXA80 – 7
HIGH IMPEDANCE
ꢀ6
ꢀ4
If you are using a constant-voltage distributed speaker
system, connect either the 25 V, 70 V, or 100 V output
terminal to the "+" side of the speaker system, and connect
the upper "GND" output terminal to the "–" side of the
speaker system.
The voltage of your speakers must equal the voltage of the
amplifier's output terminal ( 25 V, 70 V, or 100 V).
CAUTION: Make sure that you do not overload the
amplifier. This may cause overheating to the amplifier, and
possible damage to your speakers. To avoid overloading,
make sure that the taps on the speakers add up to no more
than 80% of the rated power of the amplifier being used
(CXA160: 128 watts, CXA80: 64 watts). For example, for the
CXA160, you could use a maximum of 12 speakers with 10
watt taps (12x10 = 120 watts). For further protection, use
these figures as the maximum power sum of all the speaker
taps: CXA160: 100 watts, CXA80 50 watts.
ꢀ5
ꢀ4. Output Connectors
CAUTION: To prevent the risk of electric shock, never
touch the bare wires coming from the OUTPUT TERMINALS
of the amplifier when it is switched on. When the
connections have been made, insulate the 25 V, 70 V, and
100 V terminals of the amplifier using the protective cover
supplied.
This is a five-position barrier strip for connection of speaker
loads. Each terminal accepts bare wire from 22 AWG
to 10 AWG, or spade lugs sized for the same range of
conductors.
Terminals are provided for 4 ohm low-impedance loads or
25, 70 and 100 Volt high-impedance loads.
GND and 25V are used to connect a string of 25V speakers.
Use Class II wiring:
All outputs with the exception of the 4 ohm output are
transformer isolated.
LOW IMPEDANCE
To connect a speaker directly, connect the lower GND
terminal to the negative post of your speaker, and connect
the 4 ohm terminal to the positive post.
ꢀ5V
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0
ꢀ5V
0
ꢀ5V
Make sure that your average speaker impedance is not less
than 4 ohm, as this may overload the amplifier.
The speaker output connectors are screw terminals. Use
16 or 18 gauge wire for connecting the amplifier outputs to
the speakers. Strip the wire back about 3/8" inch, loosen
the screw enough to loop the wire around the shaft of
the screw (clockwise), and tighten down the screw with a
screwdriver.
GND and 70V are used to connect 70V speakers.
Use Class II wiring:
70V
70V
70V
0
0
0
-
+
8 – CXA160 / CXA80
GND and 100V are used to connect 100V speakers
Use Class II wiring:
The unit seamlessly switches to the backup supply if
there's a power loss, allowing safety instructions and
emergency communications to continue. When both AC
power and 24 VDC power are connected, the AC power is
used and no current is drawn from the DC supply.
Note: The unit will not charge the battery, so you should
have a dedicated charging system. Note also, that when
running on DC power, the output is lower than when
running on AC power.
100V
0
0
100V
0
100V
ꢀ5. AC Power
The CXA160 and CXA80 are fitted with a detachable IEC
socket for AC input.
Each unit is fitted with a universal power supply, allowing
it to operate from any AC mains supply from 100 to 240
VAC, 50-60 Hz.
A 6-foot U-Ground to IEC power cable is supplied.
An integrated, removable, AC input fuse is fitted just below
the IEC socket. To remove or inspect the fuse, first unplug
the power cord from the AC socket. Then use a small
screwdriver to gently pry open the rectangular fuse holder
and inspect or replace the fuse. Replacement fuses must
be of the same rating as the original fuse.
Low voltage fuses are located internally.
ꢀ6. DC Power
These terminals allow the amplifier to be powered using
24 VDC emergency power supplies.
ꢀ4 VDC
The unit will automatically switch to external DC battery
power if your local AC power fails. You will need to
connect an external 24 Volt battery to the DC battery
terminals.
Make absolutely sure the positive post of your battery
connects to the positive terminal, and the negative
post connects to the negative terminal. To minimize the
voltage drop across the wires and prevent overheating, use
at least 14 AWG insulated wire.
CXA160 / CXA80 – 9
1/4" TRS Phone Plugs and Jacks
5. THERMAL CONSIDERATIONS
“TRS” stands for Tip-Ring-Sleeve, the three connections
available on a stereo 1/4" or balanced phone jack or plug.
TRS jacks and plugs are used for balanced signals and
stereo headphones:
The power amplifier within the unit is convection cooled
rather than fan cooled. Heat is drawn away from the
amplifier by the heatsink and radiated through the cooling
vents in the top and bottom cover.
RING SLEEVE
SLEEVE RING TIP
When installing, be sure to allow sufficient air space
around the top and rear of the amplifier to allow
adequate cooling for the heatsink. Leave at least one rack
space above and below, and at least 6 inches behind the
chassis to allow proper ventilation.
TIP
RING
TIP
SLEEVE
1/4" TRS Balanced Mono wiring:
Sleeve = Shield
If the amplifier should overheat, a thermal switch turns
off the power amplifier, allowing the heatsinks to cool
down. Once the amplifier has cooled to a safe operating
temperature, the thermal switch resets and reactivates
the amplifier. If this should occur, identify the cause of the
problem and take corrective action. For example:
Tip = Hot (+)
Ring = Cold (–)
1/4" TS Phone Plugs and Jacks
“TS” stands for Tip-Sleeve, the two connections available
on a mono 1/4" phone jack or plug. They are used for
unbalanced signals.
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Provide better ventilation,
Install a fan in the rack to move more air,
SLEEVE
SLEEVE
TIP
Make sure the amplifier is not overloaded with too
low of a load impedance or by a short circuit on the
speaker line.
TIP
TIP
SLEEVE
RACK MOUNTING
1/4" TS Unbalanced Wiring:
Sleeve = Shield
Tip = Hot (+)
The front panel rack holes allows the unit to be fitted
within a standard 19" rack.
The unit still needs to be supported underneath, due to the
weight of the power and output transformers.
Phoenix-type Connectors
These connectors use small screws to clamp the wires in
place. They can be balanced, using three conductor wiring,
or unbalanced using two-conductor wiring and a small
wiring link joining the ground and negative connector.
6. CONNECTIONS
The Input and Priority Input use a dual-purpose input
connector which can accept XLR and 1/4" TRS and TS plugs.
XLR Connectors
1
2
3
1
2
Inputs 1 and 2 can accept 3-pin male XLR connectors, wired
as follows:
2
SHIELD
HOT
Balanced
Unbalanced
1
3
COLD
SHIELD
1
3
COLD
2
HOT
SHIELD
COLD
HOT
1
3
2
XLR Balanced Wiring
Pin 1 = Shield
Pin 2 = Hot (+)
Pin 3 = Cold (–)
10 – CXA160 / CXA80
7. TYPICAL HOOKUP DIAGRAM
CXA160 / CXA80 – 11
8. SPECIFICATIONS
Audio Input and Proximity input
DISCLAIMER
EAW Commercial continually engages in research related
Input Type
Input Impedance
Balanced Differential, Unbalanced
30 kΩ (Bal, Line-In)
2.7 kΩ (Bal, Mic-In)
–3 dB to 40 dB (Mic Input)
–23 dB to 20 dB (Line Input)
+19 dBV
0 dBV
105 dB
to product improvement, new materials, and production
methods. Design refinements are introduced into existing
products without notice as a routine expression of that
philosophy. For this reason, any current EAW Commercial
product may differ in some respect from its published
description, but will always equal or exceed the original design
specifications unless otherwise stated.
Input Gain Trim Range:
Maximum Input Level:
Nominal Input Level:
Dynamic Range
Phantom Power
24 V
Frequency Response:
Total Harmonic Distortion
EQ
20 Hz - 20 kHz, + 1 dB
> 0.1% 20 Hz - 20 kHz @ 0 dBV
Butterworth, 12 dB fixed at 100 Hz
12 dB fixed at 10 kHz
“EAW Commercial” is a trademark of LOUD Technologies
Inc. All other brand names mentioned are trademarks or
registered trademarks of their respective holders, and are
hereby acknowledged.
Power Amplifier
CXA80 Output Power at 1% THD @ 1 kHz:
80 W @ 100 V
80 W @ 70 V
80 W @ 25 V
80 W @ 4 Ω
CXA160 Output Power at 1% THD @ 1 kHz:
160 W @ 100V
160 W @ 70V
160 W @ 25 V
160 W @ 4 Ω
Total Harmonic Distortion:
< 0.15%
(100 V, 70 V, 25 V & 4 Ω modes)
Power Bandwidth (at -1 dBr, all modes):
40 Hz - 15 kHz (+0 dB –3 dB)
95 dBV
Heatsink Overtemp, DC offset, Short Circuit
Signal to Noise ratio:
Protection:
AC Line Input Power
~100 VAC to 240 VAC 50/60Hz 200W
AC Input Low Voltage Detector threshold
70% of Nominal Line
Physical Specifications
Height (Excluding Feet):
Width (Overall):
3.46 in/88 mm
19.00 in/483 mm
Depth (Rear side of Rack ear to Rear panel, excluding connectors):
15.00 in/381 mm
CXA80 Weight:
Net
Shipping
CXA160 Weight:
Net
17.7 lb/7.9 kg
22.8 lb/10.2 kg
19.7 lb/8.8 kg
24.9 lb/11.1 kg
Shipping
Operating Temperature Range
–10°C to 45°C, 14°F to 113°F
1ꢀ – CXA160 / CXA80
CXA160 / CXA80 – 13
9. SERVICE INFORMATION
In the event that your CXA160 or CXA80 should require
servicing, please follow these instructions:
1. Call EAW Commercial Tech Support at 1-888-337-7404,
7 am to 5 pm PST (Monday-Friday), to verify the problem
and obtain a Return Authorization (RA) Number. Be sure to
have the serial number of the unit when you call. You must
have a Return Authorization Number in order to obtain
warranty service at the factory or at an authorized service
center. You can also email EAW Commercial Tech Support
2. Pack the unit in its original packaging. THIS IS VERY
IMPORTANT. LOUD Technologies is not responsible for
any damage that occurs during shipping due to non-
conventional packaging. Original packaging helps to
minimize the possibility of shipping damage.
3. Include a legible note stating your name, (no P.O. boxes),
daytime phone number, Return Authorization Number, and
a detailed description of the problem, including how we
can duplicate it.
4. Write the Return Authorization Number in BIG BOLD PRINT
on the top of the box.
5. Tech Support will tell you where to ship the unit when you
call for an RA Number. We suggest insurance for all forms
of cartage.
14 – CXA160 / CXA80
10. EAW COMMERCIAL WARRANTY
Warranty: LOUD Technologies Inc. requires its authorized
EAW Commercial distributors to abide by the following
warranty terms for all EAW Commercial brand products
(all dates are from the date of delivery from an Authorized
EAW Commercial Distributor to the end user/installation
site): Loudspeakers – 5 years; Active Electronics – 5 years;
Accessories – 2 years.
What Is Covered: Defects in workmanship and materials
and against malfunctions. EAW Commercial distributors
must remedy all such defects and malfunctions without
charge for parts or labor if the warranty applies. Final
determination of warranty coverage lies solely with each
authorized EAW Commercial distributor.
What Is Not Covered: This warranty does not extend
to damage or malfunctions resulting from, but not limited
to, shipment, improper installation, misuse, neglect,
abuse, normal wear, accident, or to any product on
which the serial number has been modified or removed.
Exterior defects in or damage to the exterior appearance
are specifically excluded from this warranty. EAW
Commercial distributors shall not be liable for incidental
or consequential damages resulting from the use of EAW
Commercial products. Repairs and/or modifications by
other than an Authorized EAW Commercial Distributor
automatically voids this warranty.
CXA160 / CXA80 – 15
EAW Commercial A LOUD Technologies Inc. Company
EAW Commercial | One Main Street | Whitinsville, MA 01588 USA | TEL toll free within US/Canada 888.337.7404
© 2007 LOUD Technologies Inc. All Rights Reserved.
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