EAW Stereo Amplifier CXA160 CXA80 User Manual

INSTRUCTION MANUAL  
CXA160 / CXA80  
Integrated Amplifiers  
 
FEATURES  
ꢀ. INTRODUCTION  
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.  
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  
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  
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  
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
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.  
14  
11  
1ꢀ  
13  
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  
 
17  
18  
ꢀ1  
19  
ꢀ0  
ꢀꢀ ꢀ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  
0
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.  
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  
TEL outside US 425.892.6503 | FAX 425.485.1152 | www.eawcommercial.com  
© 2007 LOUD Technologies Inc. All Rights Reserved.  
 

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