Christie Vive Audio CDA5 User manual

Christie Vive Audio
CDA5/CDA7.5 Amplifiers
User Manual
020-101354-01

Christie Vive Audio
CDA5/CDA7.5 Amplifiers
User Manual
020-101354-01

NOTICES
COPYRIGHT AND TRADEMARKS
Copyright © 2013 Christie Digital Systems USA Inc. All rights reserved.
All brand names and product names are trademarks, registered trademarks or trade names of their respective holders.
GENERAL
Every effort has been made to ensure accuracy, however in some cases changes in the products or availability could occur which may
not be reflected in this document. Christie reserves the right to make changes to specifications at any time without notice.
Performance specifications are typical, but may vary depending on conditions beyond Christie's control such as maintenance of the
product in proper working conditions. Performance specifications are based on information available at the time of printing. Christie
makes no warranty of any kind with regard to this material, including, but not limited to, implied warranties of fitness for a particular
purpose. Christie will not be liable for errors contained herein or for incidental or consequential damages in connection with the
performance or use of this material.Canadian manufacturing facility is ISO 9001 and 14001 certified.
WARRANTY
Products are warranted under Christie’s standard limited warranty, the complete details of which are available by contacting your
Christie dealer or Christie. In addition to the other limitations that may be specified in Christie’s standard limited warranty and, to the
extent relevant or applicable to your product, the warranty does not cover:
a) Problems or damage occurring during shipment, in either direction.
b) Projector lamps (See Christie’s separate lamp program policy).
c) Problems or damage caused by use of a projector lamp beyond the recommended lamp life, or use of a lamp other than a Christie lamp
supplied by Christie or an authorized distributor of Christie lamps.
d) Problems or damage caused by combination of a product with non-Christie equipment, such as distribution systems, cameras, DVD
players, etc., or use of a product with any non-Christie interface device.
e) Problems or damage caused by the use of any lamp, replacement part or component purchased or obtained from an unauthorized
distributor of Christie lamps, replacement parts or components including, without limitation, any distributor offering Christie lamps,
replacement parts or components through the internet (confirmation of authorized distributors may be obtained from Christie).
f) Problems or damage caused by misuse, improper power source, accident, fire, flood, lightening, earthquake or other natural disaster.
g) Problems or damage caused by improper installation/alignment, or by equipment modification, if by other than Christie service personnel
or a Christie authorized repair service provider.
h) Problems or damage caused by use of a product on a motion platform or other movable device where such product has not been
designed, modified or approved by Christie for such use.
i) Problems or damage caused by use of a projector in the presence of an oil-based fog machine or laser-based lighting that is unrelated to
the projector.
j) For LCD projectors, the warranty period specified in the warranty applies only where the LCD projector is in “normal use” which means
the LCD projector is not used more than 8 hours a day, 5 days a week.
k) Except where the product is designed for outdoor use, problems or damage caused by use of the product outdoors unless such product is
protected from precipitation or other adverse weather or environmental conditions and the ambient temperature is within the
recommended ambient temperature set forth in the specifications for such product.
l) Image retention on LCD flat panels.
m) Defects caused by normal wear and tear or otherwise due to normal aging of a product.
The warranty does not apply to any product where the serial number has been removed or obliterated. The warranty also does not
apply to any product sold by a reseller to an end user outside of the country where the reseller is located unless (i) Christie has an
office in the country where the end user is located or (ii) the required international warranty fee has been paid.
The warranty does not obligate Christie to provide any on site warranty service at the product site location.
PREVENTATIVE MAINTENANCE
Preventative maintenance is an important part of the continued and proper operation of your product. Please see the Maintenance
section for specific maintenance items as they relate to your product. Failure to perform maintenance as required, and in accordance
with the maintenance schedule specified by Christie, will void the warranty.
REGULATORY (if applicable)
The product has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference when the product is operated in a
commercial environment. The product generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications. Operation of the product in a
residential area is likely to cause harmful interference in which case the user will be required to correct the interference at the user’s
own expense.
CAN ICES-3 (A) / NMB-3 (A)

이
기기는
업무용
(A
급
)
으로
전자파적합등록을
한
기기이오니
판매자
또는
사용자는
이점을
주의하시기
바라며
,
가정
외의
지역에서
사용하는
것을
목적으로
합니다
.
ENVIRONMENTAL
The product is designed and manufactured with high-quality materials and components that can be recycled and reused. This symbol
means that electrical and electronic equipment, at their end-of-life, should be disposed of separately from regular waste. Please
dispose of the product appropriately and according to local regulations. In the European Union, there are separate collection systems
for used electrical and electronic products. Please help us to conserve the environment we live in!

Christie Vive Audio CDA5/CDA7.5 Amplifiers User Manual i
020-101354-01 Rev. 1 (03-2014)
Table of Contents
Important Safety Information....................................................................................................................... 1
Introduction .................................................................................................................................................. 3
Overview ................................................................................................................................................... 3
Features .................................................................................................................................................... 3
What’s In the Box?.................................................................................................................................... 3
Controls and Indicators............................................................................................................................. 4
Front Panel............................................................................................................................................ 4
Rear Panel ............................................................................................................................................. 5
Installation .................................................................................................................................................... 7
Install the CDA5 or CDA7.5 ....................................................................................................................... 7
Connections .............................................................................................................................................. 7
Stereo Mode Connections .................................................................................................................... 8
Biamp Mode Connections .................................................................................................................... 9
Operation ................................................................................................................................................ 10
Turn the Power On.............................................................................................................................. 10
Turn the Power Off ............................................................................................................................. 10
Troubleshooting.......................................................................................................................................... 11
Specifications .............................................................................................................................................. 13
Audio ....................................................................................................................................................... 13
Connections ............................................................................................................................................ 13
Power ...................................................................................................................................................... 14
Block Diagram ......................................................................................................................................... 15
Physical ................................................................................................................................................... 16

Christie Vive Audio CDA5/CDA7.5 Amplifiers User Manual 1
020-101354-01 Rev. 1 (03-2014)
Important Safety Information
Read this information thoroughly and completely before installing or operating Christie Vive Audio
CDA5/CDA7.5 Professional Power Amplifiers.
•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 ventilation openings. Install in accordance with the manufacturer’s
instructions.
•Do not install near any heat sources such as radiators, heat registers, stoves, or other
devices(including amplifiers) that produce heat.
•Do not defeat the safety purpose of the polarized or grounding-type 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. If 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 from where they exit the apparatus).
•Only use attachments or accessories specified by the manufacturer.
•Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold
with the apparatus. When a cart is used, use caution when moving the cart and apparatus
combination to avoid injury from tip-over.
•Unplug this apparatus during lightning storms or when unused for long periods of time.
•To reduce the risk of electric shock, disconnect the AC power cord to completely remove power
from the unit before repair or maintenance.
•All servicing must be completed by 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.
•Changes or modifications to this unit not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
•Provide rear support if this product is mounted in an equipment rack.
•Do not install the amplifier near water where the electrical components can be exposed to
moisture. Do not place objects containing liquids, such as vases, on the product.
•Provide proper ventilation. Allow 31 cm (12 in.) clearance from the nearest combustible
surface.
•Make sure that vents are not blocked and that air can flow freely through the unit.

2Christie Vive Audio CDA5/CDA7.5 Amplifiers User Manual
020-101354-01 Rev. 1 (03-2014)
•The power switch does not break both sides of the primary mains. Hazardous energy can be
present inside the chassis when the power switch is in the off position. The mains plug or
appliance coupler is used as the disconnect device. The disconnect device shall remain readily
operable.
•Exposure to extremely high noise levels may cause permanent hearing loss. Individuals vary
considerably in their susceptibility to noise-induced hearing loss, but nearly everyone will lose
some hearing if exposed to sufficiently intense noise for a sufficient time. These are the
permissible noise level exposures specified by the United States Occupational Safety and
Health Administration (OSHA):
Duration (Consecutive)
Sound Level (dBA), Slow Response
8 hrs 90
6 hrs 92
4 hrs 95
3 hrs 97
2 hrs 100
1.5 hrs 102
1 hr 105
30 min 110
≤15 min 115
According to the OSHA, any exposure in excess of the above permissible limits could result in
some hearing loss. Earplugs or protectors to the ear canals or over the ears must be worn
when operating this amplification system to prevent permanent hearing loss, if exposure is in
excess of the described limits.
TECHNICAL SUPPORT
Contact your dealer or technical support for questions relating to unclear information, malfunctions, or product repairs.
Americas
Email:
[e-mail]
Phone:
• Canada and USA: [phone]
• Chile: 519-744-8005
Europe, Middle East, and Africa
Email:
[e-mail]
Phone:
• Russia: [phone]
• Eastern Europe: [phone]
• France: [phone]
• Germany: [phone]
• Italy: [phone]
• Africa: [phone]
• Spain: [phone]
• Middle East: [phone]
• United Kingdom: [phone]
Asia Pacific
Email:
tech-[email protected]
Phone:
• Australia: [phone]
• China: [phone]
• India: [phone]
• Japan: 81-3-3599-7481
• South Korea: [phone]
• Singapore: [phone]

Christie Vive Audio CDA5/CDA7.5 Amplifiers User Manual 3
020-101354-01 Rev. 1 (03-2014)
Introduction
This user manual provides data about the Christie Vive Audio CDA5/CDA7.5 Professional Power
Amplifiers controls, installation, and specifications.
Overview
Christie Vive Audio CDA5/CDA7.5 Professional Power Amplifiers utilize an advanced design that reduces
the weight of the amplifier significantly while increasing output power, reliability, and thermal
efficiency.
Christie Vive Audio CDA5/CDA7.5 Professional Power Amplifiers are designed with a resonant switch-
mode power supply and a high-speed class D topology that yields superior audio resolution and
efficiency. Advanced technology and extensive protection circuitry allow operation with greater
efficiency into difficult loads and power conditions. The ACL (Automatic Clip Limiting) circuitry
provides trouble-free operation into loads as low as 2 ohms. ACL protects loudspeaker drivers and
ensures that sonic integrity is maintained, even in extreme overload conditions. The CDA’s high-
efficiency design allows the amplifier to operate at very low temperatures, and does not require
massive heat sinks for cooling.
Features
•Two channel-independent, fourth order Linkwitz-Riley crossovers
•Automatic Clip Limiting (ACL) protection
•Revolutionary CDA Class-D power regulation topology
•Detented input controls
•Combination XLR - 6.3 mm (1/4 in.) inputs
•Twist-lock connector outputs
•Ultra-lightweight
•4-pole twist lock output connectors
What’s In the Box?
Quantity Description Part Number
1 Christie Vive Audio CDA5 Professional Amplifier 100V –or-
Christie Vive Audio CDA5 Professional Amplifier 120V –or-
Christie Vive Audio CDA5 Professional Amplifier 230V –or-
Christie Vive Audio CDA7.5 Professional Amplifier 100V –or-
Christie Vive Audio CDA7.5 Professional Amplifier 120V –or-
145-007108-XX
145-003104-XX
145-011103-XX
145-008109-XX
145-004105-XX

4Christie Vive Audio CDA5/CDA7.5 Amplifiers User Manual
020-101354-01 Rev. 1 (03-2014)
Christie Vive Audio CDA7.5 Professional Amplifier 230V
145-012104-XX
1
Power Cord
The included power
cord is specific for each
region. Please check
the box to ensure you
have the correct one.
Controls and Indicators
This section provides an overview of the Christie Vive Audio CDA5/CDA7.5 Professional Power
Amplifiers components.
Front Panel
Letter Component Description
A Input Gain Control Adjusts the gain for their respective amplifier channel (Ch.A or Ch.B) in all
modes. The recommended nominal setting is -4dB for all channels except
the LFE channel. Use a nominal setting of -10dB for the LFE channel.
B Indicators Indicates the operating status of each of the channels and warns of
possible malfunction. There are 5 indicators for each channel:
•ACL (automatic clip limiting)—indicates clipping. If the light is flashing
quickly and intermittently, the channel is at the clip threshold. Gain
reduction is automatically employed to prevent severely clipped
waveforms from reaching the loudspeakers.
•SIG (signal)—indicates that an output signal of 4 volts RMS or more
(0.1 volt or more at the input with 0 dB attenuation and standard x 40
voltage gain) is being produced by the channel. The signal is reaching
and being amplified by the amplifier.
•TEMP (temperature)—indicates an unstable thermal condition. The
amplifier protection will activate and shut down the affected channel.
The light will remain illuminated until a safe operating temperature is
achieved.
•DC (direct current)—indicates abnormal operating conditions. The
light illuminates when conditions arise that will damage the
loudspeaker driven by that channel. The amplifier automatically
attempts to restart to correct the condition. If the amplifier does not
return to a normal operating status, contact your local authorized

Christie Vive Audio CDA5/CDA7.5 Amplifiers User Manual 5
020-101354-01 Rev. 1 (03-2014)
service center.
•ACTIVE—indicates that the channel is operational. The light
illuminates under normal operation and remains on, even when the
channel is in ACL gain reduction. If the light is off, there is no signal at
the output connectors.
C AC Power Switch Turns the power on and off. This is a combination magnetic circuit breaker
and switch.
D Rack Mounting Ears Provides mounting holes for rack installation.
Rear Panel
Letter Component Description
A AC Power Inlet This is the receptacle for an IEC line cord, which provides AC power to the
unit. Connect the line cord to this connector to provide power to the unit.
Damage to the equipment may result if improper line voltage is used. (See
line voltage marking on unit). The 120VAC CDA7.5 gets a power cord
retaining clamp.
Never break off the ground pin on any equipment. It is provided for your
safety. If the outlet used does not have a ground pin, a suitable grounding
adapter should be used and the third wire should be grounded properly. To
prevent the risk of shock or fire hazard, always make sure that the
amplifier and all associated equipment is properly grounded.
B Outputs All models have one combination 4 pole twist lock output connector per
channel. Channel A output allows for CH A 1+ Pos / 1- Neg and Channel B
2+ Pos / 2- Neg to use a single 4 conductor speaker cable.
C Inputs with Channel Mode
Switch and Thru/Out
Jacks
Provides the connecting inputs and input controls. Input connections are
made using the 3-pin XLR (pin 2+) or 6.3 mm (1/4 in.) plug combination
connectors on the rear panel of the amplifier. The inputs are actively
balanced.
The following channel modes are available:
•SUB (subwoofer)—activates the low pass filter for the corresponding
channel. This Linkwitz-Riley filter limits the frequencies sent to the
associated amplifier channel to those frequencies below 100 Hz. in
situations where separate subwoofer cabinets are being used, this
position indicates connecting the subwoofer speaker cabinet to the
channel associated with the subwoofer switch.
•FULL-RANGE—allows all frequencies to pass to the amplifier. This
setting is normally used when connecting a full range speaker
enclosure to the amplifier’s output.
•HIGH-OUT (switch high pass)—activates the high pass filter for the
corresponding channel. This Linkwitz-Riley filter limits the frequencies
sent to the associated amplifier channel to those frequencies above
100 Hz. In situations where separate subwoofer cabinets are being
used, this position would indicate connecting the mid-high frequency
speaker cabinet to the channel associated with the high pass switch.

6Christie Vive Audio CDA5/CDA7.5 Amplifiers User Manual
020-101354-01 Rev. 1 (03-2014)
The ¼” jack supplies parallel output signals from the associated channel
for patching to this amplifier and/or additional power amplifier inputs.
D Cooling Vents for Variable
Speed
80mm DC Fan
Provides air flow through the cooling fins of the channel heat-sinks, to
dissipate the heat of the power devices. Air exhausts through the front
panel slots. Fan speed is automatically controlled; the fan speed increases
as the heat-sink temperature rises, and slows as the temperature lowers.
Make sure these vents remain clear to allow unrestricted air flow.
If a channel’s heat-sink surpasses the maximum temperature limit, the
high temperature sensing circuit will idle the channel until a safe operating
temperature is restored. If the power supply overheats, the high
temperature sensing circuit will idle both channels until a safe operating
temperature is restored.

Christie Vive Audio CDA5/CDA7.5 Amplifiers User Manual 7
020-101354-01 Rev. 1 (03-2014)
Installation
This section provides information and procedures for installing and connecting the Christie Vive Audio
CDA5/CDA7.5 Professional Power Amplifiers.
Install the CDA5 or CDA7.5
An incorrect power setup creates a fire and shock hazard. Do not attempt operation
unless the power cord, power socket, and power plug meet the appropriate local
rating standards. Have a certified electrician install a permanent single-phase
connection from the amplifier to the AC supply for correct installation. Failure to
comply could result in death or serious injury.
Always provide proper ventilation to the Christie Vive Audio CDA5/CDA7.5
Professional Power Amplifiers. Allow 31 cm (12 in.) clearance at the front and the
back of the amplifier. Make sure that vents are not blocked and that air can flow
freely through the unit. Do not use doors or covers on the front of the rack. If a
back cover is used, provide at least one standard rack-space opening for every 4
amplifiers. Failure to comply may result in equipment or property damage.
1. Slide the CDA5 or CDA7.5 amplifier into your rack.
2. Secure the amplifier in position using 4 screws through the rack mounting ears.
3. Connect one end of the power cord to the AC power inlet and the other end to the power outlet.
4. Connect the output and input connectors.
See Connections on pages 12-13.
5. Turn the power on.
See Turn the Power On on page 14.
Connections
Always turn off and disconnect the Christie Vive Audio CDA5/CDA7.5 Professional Power
Amplifiers from power before making audio connections. Failure to comply may result in
equipment or property damage.
This section describes the input connections of the Christie Vive Audio CDA5/CDA7.5 Professional Power
Amplifiers.

8Christie Vive Audio CDA5/CDA7.5 Amplifiers User Manual
020-101354-01 Rev. 1 (03-2014)
Stereo Mode Connections

Christie Vive Audio CDA5/CDA7.5 Amplifiers User Manual 9
020-101354-01 Rev. 1 (03-2014)
Biamp Mode Connections

10 Christie Vive Audio CDA5/CDA7.5 Amplifiers User Manual
020-101354-01 Rev. 1 (03-2014)
Operation
This section provides operating procedures.
Turn the Power On
•Use only the AC power cord that is provided. DO NOT attempt operation if
the AC supply is not within the specified voltage and power range. Failure
to comply could result in death or serious injury.
•As a safety feature, the amplifier is equipped with a three-wire plug with a
third (grounding) pin. If you are unable to insert the plug into the outlet,
contact an electrician to have the outlet replaced. DO NOT defeat the
safety purpose of the grounding-type plug. Failure to comply could result
in death or serious injury.
•DO NOT attempt operation if the AC supply is not within the rated voltage
range as specified on the license label. For power requirements, see Power
on page 19. Failure to comply could result in death or serious injury.
•Disconnect amplifier from AC before opening any enclosure. Failure to
comply could result in death or serious injury.
•Only qualified service technicians are permitted to open enclosures and
only if the amplifier is disconnected from AC power. Failure to comply
could result in death or serious injury.
•DO NOT allow anything to rest on the power cord. Locate the amplifier
where the cord cannot be damaged by persons walking on it or objects
rolling over it. Never operate the amplifier if the power cable appears
damaged in any way. Failure to comply could result in minor or moderate
injury.
•DO NOT overload power outlets and extension cords as this can result in
fire or shock hazards. Failure to comply could result in minor or moderate
injury.
1. Verify that the power cord is connected and that the amplifier settings are as required.
2. Move the AC power switch to the on position.
Turn the Power Off
Move the AC power switch to the off position.

Christie Vive Audio CDA5/CDA7.5 Amplifiers User Manual 11
020-101354-01 Rev. 1 (03-2014)
Troubleshooting
This section provides basic Christie Vive Audio CDA5/CDA7.5 Professional Power Amplifiers troubleshooting
information.
Do not service the amplifier yourself. Contact a qualified service technician.
Problem Resolution
The amplifier power will
not turn on. •Verify that the amplifier is receiving power. Plug the amplifier into the AC mains.
Connect the IEC line cord to the AC power inlet on the rear panel of the amplifier.
•Verify that the circuit breaker for the mains circuit is open. Reset the circuit
breaker, then turn the amplifier power on again. If the AC mains breaker
continues to open, check the voltage and amperage (d) of the circuit.
•Verify that the circuit breaker has the correct voltage and amperage (d). If
required, have a qualified electrician replace the circuit breaker. If the circuit
breaker continues to open, send the amplifier to an authorized service center for
repair.
The amplifier power is on,
but there is no sound
from the loudspeakers.
Check the amplifier indicators:
•If the ACTIVE indicators are lit for each channel, verify that the amplifier is
receiving power. See “The amplifier power will not turn on”.
•If the SIG (signal) indicators are lit or blinking, check the level of the input signal
source.
•If the TEMP (temperature) indicators are lit for either channel, the amplifier has
overheated and idled one or both channels. See “The amplifier is overheating”.
•If the DC (direct current) indicators are lit for either channel, an abnormal
condition exists within the amplifier or the load it is driving. If the channel does
not reset and the DC indicators remain lit, send the amplifier to an authorized
service center for repair.
•Verify that the attenuators on the front panel are turned up. Turn the attenuators
up until you hear output from the loudspeakers.
•Check all connections between the amplifier and loudspeakers. Make sure that the
twist lock connectors are fully-inserted and seated. The connectors must be
inserted and turned 1/4” clockwise until they lock in position. If screw terminal
connections are used at the loudspeaker inputs, make sure the cables are
attached and do not cause a short between the poles of the loudspeaker inputs.
•Inspect the loudspeaker cables and repair any shorts or breaks in the cables, or
replace the cables.
•Inspect all loudspeaker cable connection terminations to make sure they are
complete and wired correctly. Verify the polarity of each connection.
There is output from one
channel, but not from the
other channel.
•Verify that the attenuators are turned up for both channels.
•Check all connections between the amplifier and loudspeakers. Make sure that the
twist lock connectors are fully-inserted and seated. The connectors must be
inserted and turned 1/4” clockwise until they lock in position. If screw terminal
connections are used at the loudspeaker inputs, make sure the cables are
attached and do not cause a short between the poles of the loudspeaker inputs.
Check the amplifier indicators:
•If the SIG (signal) indicators are lit or blinking for both channels, make sure the
channel’s input signal is present and at a sufficient level to drive the input.
•If the TEMP (temperature) indicators are lit for either channel, the amplifier has
overheated and idled one or both channels. See “The amplifier is overheating”.
•If the DC (direct current) indicators are lit for either channel, an abnormal

12 Christie Vive Audio CDA5/CDA7.5 Amplifiers User Manual
020-101354-01 Rev. 1 (03-2014)
condition exists within the amplifier or the load it is driving. If the channel does
not reset and the DC indicators remain lit, send the amplifier to an authorized
service center for repair.
Check the amplifier mode:
•If the amplifier is in STEREO mode, make sure there is signal input to CH A and
CH B. See “Input Connections”.
There is sound output
from the loudspeakers,
but there are no high
frequencies present in the
output.
•Check if the low-pass filter is engaged on either channel. Make sure the input
mode selector switch is set to the correct mode (Full Range is the default mode).
•Verify that the NL4 twist-lock connector is wired correctly if the loudspeaker is
biamped through the CH A output connection. See “Biamp Mode Connections”.
There is sound output
from the loudspeakers,
but there are no low
frequencies present in the
output.
•Check if the high-pass filter is engaged on either channel. Make sure the input
mode selector switch is set to the correct mode (Full Range is the default mode).
•Verify that the NL4 twist-lock connector is wired correctly if the loudspeaker is
biamped through the CH A output connection. See “Biamp Mode Connections”.
The amplifier is
overheating. •Verify that there is adequate ventilation around the amplifier. Make sure there is
31 cm (12 in.) clearance at the front and the back of the amplifier.
•Verify that the amplifier cooling vents are not blocked.
•Check the internal cooling fan of the amplifier to make sure they are working. If
the power amplifier has overheated, the TEMP indicators are lit, and the fans are
not operating, cease operation of the amplifier and send it to an authorized
service center for repair.
•Verify that the amplifier is operating within its rated impedance. Check the
loudspeaker load being presented to the amplifier outputs. The minimum load
impedance for the CDA5 and CDA7.5 power amplifier is 2 ohms. Loudspeaker
loads below 2 ohms stereo (4 ohms for each channel) or 4 ohms bridged cause
the amplifier to overheat. If overloaded, correct the loudspeaker configuration or
load the resume operation.