CD Power Amplifier
Owner’s Manual
CD
Intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that
may be of sufficient magnitude to constitute a risk of electric shock to persons.
Intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product.
CAUTION:Risk of electrical shock — DO NOT OPEN!
CAUTION:To reduce the risk of electric shock,do not remove cover.No user ser viceable par ts inside. Refer servicing to
qualified service personnel.
WARNING: To prevent electrical shock or fire hazard,do not expose this appliance to rain or moisture. Before using this
appliance, read the operating guide for further warnings.
Este símbolo tiene el propósito,de alertar al usuario de la presencia de “(voltaje) peligroso” sin aislamiento dentro de
la caja del producto y que puede tener una magnitud suficiente como para constituir riesgo de descarga eléctrica.
Este símbolo tiene el propósito de alertar al usario de la presencia de instruccones importantes sobre la operación y
mantenimiento en la información que viene con el producto.
PRECAUCION:Riesgo de descarga eléctrica ¡NO ABRIR!
PRECAUCION:Para disminuír el riesgo de descarga eléctrica, no abra la cubier ta. No hay piezas útiles dentro.Deje todo
mantenimiento en manos del personal técnico cualificado.
ADVERTENCIA:Para evitar descargas eléctricas o peligro de incendio,no deje expuesto a la lluvia o humedad este aparato Antes de usar este aparato,Iea más advertencias en la guía de operación.
Ce symbole est utilisé dans ce manuel pour indiquer à l’utilisateur la présence d’une tension dangereuse pouvant être
d’amplitude suffisante pour constituer un risque de choc électrique.
Ce symbole est utilisé dans ce manuel pour indiquer à l’utilisateur qu’il ou qu’elle trouvera d’importantes instructions
concernant l’utilisation et l’entretien de l’appareil dans le paragraphe signalé.
ATTENTION: Risques de choc électrique — NE PAS OUVRIR!
ATTENTION:Afin de réduire le risque de choc électrique,ne pas enlever le couvercle.Il ne se trouve à l’intérieur aucune
pièce pouvant être reparée par l’utilisateur. Confiez I’entretien et la réparation de l’appareil à un réparateur agréé.
AVERTISSEMENT:Afin de prévenir les risques de décharge électrique ou de feu, n’exposez pas cet appareil à la pluie ou
à l’humidité.Avant d’utiliser cet appareil,lisez attentivement les avertissements supplémentaires de ce manuel.
Dieses Symbol soll den Anwender vor unisolierten gefährlichen Spannungen innerhalb des Gehäuses warnen, die von
Ausreichender Stärke sind,um einen elektrischen Schlag verursachen zu können.
Dieses Symbol soll den Benutzer auf wichtige Instruktionen in der Bedienungsanleitung aufmerksam
machen,die Handhabung und Wartung des Produkts betreffen.
VORSICHT:Risiko — Elektrischer Schlag! Nicht öffnen!
VORSICHT:Um das Risiko eines elektrischen Schlages zu vermeiden,nicht die Abdeckung enfernen. Es befinden sich keine
Teile darin, die vom Anwender repariert werden könnten.Reparaturen nur von qualifiziertem Fachpersonal durchführen
lassen.
ACHTUNG:Um einen elektrischen Schlag oder Feuergefahr zu vermeiden,sollte dieses Gerät nicht dem Regen oder
Feuchtigkeit ausgesetzt werden.Vor Inbetriebnahme unbedingt die Bedienungsanleitung lesen.
IMPORTANT SAFETY INSTRUCTIONS
WARNING: When using electrical products, basic cautions should always be followed, including the following:
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any of the ventilation openings. Install in accordance with manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves or other apparatus (including
amplifiers) that produce heat.
9. 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 plug. The wide blade or third
prong is provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched, par ticularly at plugs, convenience receptacles, and the
point they exit from the apparatus.
11. Only use attachments/accessoriegs provided by the manufacturer.
12. Use only with a 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/apparatus combination to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when unused for long periods of time.
14.
15. Never break off the ground pin. Write for our free booklet “Shock Hazard and Grounding.” Connect only to a power
16. If this product is to be mounted in an equipment rack, rear support should be provided.
17. Exposure to extremely high noise levels may cause a permanent hearing loss. Individuals vary considerably in
According to OSHA, any exposure in excess of the above permissible limits could result in some hearing loss. Ear plugs or
According to OSHA, any exposure in excess of the above permissible limits could result in some hearing loss. Ear plugs or
protectors to the ear canals or over the ears must be worn when operating this amplification system in order to prevent a
protectors to the ear canals or over the ears must be worn when operating this amplification system in order to prevent a
permanent hearing loss, if exposure is in excess of the limits as set forth above. To ensure against potentially dangerous
permanent hearing loss, if exposure is in excess of the limits as set forth above. To ensure against potentially dangerous
exposure to high sound pressure levels, it is recommended that all persons exposed to equipment capable of producing high
exposure to high sound pressure levels, it is recommended that all persons exposed to equipment capable of producing high
sound pressure levels such as this amplification system be protected by hearing protectors while this unit is in operation.
sound pressure levels such as this amplification system be protected by hearing protectors while this unit is in operation.
Refer all servicing to qualified ser vice 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.
supply of the type marked on the unit adjacent to the power supply cord.
susceptibility to noise-induced hearing loss, but nearly everyone will lose some hearing if exposed to sufficiently
intense noise for a sufficient time. The U.S. Government’s Occupational and Health Administration (OSHA) has
specified the following permissible noise level exposures:
Duration Per Day In Hours Sound Level dBA, Slow Response
890
692
495
397
2 100
1 1/2 102
1 105
1/2 110
1/4 or less 115
SAVE THESE INSTRUCTIONS !
1
Save the carton and packing materials!
Should you ever need to ship the unit,
use only the original factor y packing.
For replacement packaging,call Crest Audio’ s
Customer Service Department directly.
2
Read all documentation before
operating your equipment. Retain all
documentation for future reference.
3
Follow all instructions printed on
unit chassis for proper operation.
4
Never hold a power switch or circuit breaker in the on-position, if
it won’t stay there by itself !
5
Do not use the unit if the electrical
power cord is frayed or broken.
The power supply cords should be
routed so that they are not likely to be
walked on or pinched by items placed
upon or against them.
6
Always operate the unit with the
AC ground wire connected to the
electrical system ground. Precautions
should be taken so that the means of
grounding of a piece of equipment is not
defeated.
7
Damage caused by connection to
improper A C v oltage is not co ver ed
by any warranty. Mains voltage must be
correct and the same as that printed on
the rear of the unit.
8
Do not ground any hot (red) terminal.
Never connect a hot
(red) output to
ground or to another hot (red)output!
9
Power down and disconnect units
from mains voltage before making
connections.
0
Do not drive the inputs with a signal level greater than that
required to enable equipment to
reach full output.
¡
Do not run the output of any amplifier channel back into another
channel’s input.
Do not parallel- or series-connect
an amplifier output with any
other amplifier output.
Crest Audio is not responsib le for damage
to loudspeakers for any reason.
Ô
Do not connect the inputs or outputs of amplifiers to any other
voltage source: such as a battery,
mains source, or power supply, regardless of whether the amplifier is turned
on or off.
£
Connecting amplifier outputs to
oscilloscopes or other test equipment while the amplifier is in bridged
mono mode may damage both the
amplifier and test equipment!
¢
Do not spill water or other liquids
into or on the unit,or operate the
unit while standing in liquid.
ˆ
Do not block fan intake or
exhaust ports.
Do not operate equipment on a
surface or in an environment
which may impede the normal
flow of air around the unit: such as
a bed, rug, weathersheet, carpet, or
completely enclosed rack.
§
If the unit is used in an extremely
dusty or smoky environment: the
unit should be periodically blown free of
foreign matter.
¶
Do not use the unit near stoves,
heat registers, radiators, or other
heat producing devices.
ƒ
The power cord of equipment
should be unplugged from the outlet when left unused for a long period of time.
Service Information
Do not remov e the cover!
Removing the cover will expose you to
potentially dangerous voltages.There are
no user serviceable parts inside.
Equipment should be serviced by
qualified service personnel when:
A. The power supply cord or the plug has
been damaged.
B. The equipment has been exposed to rain.
C. The equipment does not appear to oper-
ate normally ,or exhibits a marked change in
performance.
D. The equipment has been dropped, or the
enclosure damaged.
To obtain service:
contact your nearest Crest Audio
Service Center, Distributor, Dealer,
or Crest Audio at 201.909.8700
USA
or visit www.crestaudio.com for additional information.
email techserve
@crestaudio.com
This equipment conforms to EN55022 Class A.In a
domestic environment this product may cause radio
interference in which case the user may be required to
take adequate measures.
This equipment has been tested and found to comply
with the limits for a Class B digital device pursuant to
part 15 of the FCC Rules.These limits are designed to
provide reasonable protection against harmful interference in a residential installation.This equipment generates, uses and can radiate radio frequency ener gy and, if
not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment
does cause harmful interference to radio or television
reception, which can be determined by turning the
equipment off and on, the user is encouraged to tr y to
correct the interference by one or more of the following
measures:
*Reorient or relocate the receiving antenna.
*Increase the separation between the equipment and
the receiver.
*Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
*Consult the dealer or an experienced radio/TV techni-
cian for help.
This symbol is used to alert
the operator to follow important
procedures and precautions
detailed in documentation.
This symbol is used to warn operators
that uninsulated “dangerous voltages”
are present within the equipment enclosure that may pose a risk of electric
shock.
important precautions
p.1
table of contents
1
2
3
4
5
6
7
how to use this manual
p.2
introduction
p.3
installation
p.5
unpacking
mounting
cooling and ventilation
powering
maintenance
features over view
p.9
front panel
rear panel
operation modes
p.15
stereo
parallel
bridged
connections
p.17
input
output
safety
p.21
tourclass protection
precautions
user responsibility
service and support
p.25
support
contact us
registration
specifications
p.27
block diagram
p.28
optional handle installation
p.29
wire gauge charts
p.30
b
c
d
a
contents
appendices
p.2
CD owner’s manual
how to use this manual
1
conventions
terms
official Crest Audio features and
each indicator or control on the amplifier will appear as:terms
actions
specific actions or selections the user can execute will appear as:actions
tasks
are broken down into steps 1
2
3
warnings
indicators
tips
see
see—refers to other sections of the manual containing
supplementary information on the current topic or a related issue
note
note—supplementary feature information
Preferred methods.
Helpful hints.
Feature insights.
+
Procedures not to attempt.
Issues or hazards to keep in
mind when operating
the equipment.
a
What to look for on
the equipment display.
Alerts, indicators, or
prompts that may appear.
®
p.3
introduction
1
welcome
Congratulations on your purchase of a new CD Series professional power amplifier and thank you for your confidence in Crest Audio products.You are among the growing number of audio professionals who have made Crest
Audio one of the world’s leading suppliers of professional and commercial/industrial audio systems.
For your safety, please read the Important Precautions section befor e installing and operating the amplifier .The Crest
Audio CD Series amplifiers are designed for high operating efficiency and accurate sonic perf ormance acr oss the full
audio bandwidth,even under stressful conditions.
The Crest Audio CD series amplifiers utilize Class D amplifier technology which greatly improves the efficiency of
the amplifier and reduces the power demand from the mains supply.The CD amplifier incorporates a linear power
supply design and are built to uncompromising standards.This, combined with major advances in amplifier technology provides for extreme reliability and sonic accuracy for which Crest products are renown.
linear-toroid power supply
A traditional linear power supply is used in the CD Series.Because of the amplifier section’s efficiency,(approx
80%) the transformer does not need to be as big or as heavy.This gives the CD Series an advantage in delivering more power in a more compact package.
The efficiency of the output stage also gives the power supply the ability to handle hea vy-duty cycles without
compromising sonic integrity.
In order to maintain strict quality assurance standards,all Crest Audio power amplifiers are built in our state-of-theart USA manufacturing facility. Internal components are the finest available and key sub-assemblies are pre-tested
before final assembly. Each amplifier is “burned in” and thoroughly tested (using precision audio test equipment)
before shipping.In addition,all CD Series amplifiers incorporate Crest’s exclusive TourClass
®
protection features to
safeguard both internal circuitry and connected loudspeakers.
This proven combination of advanced design,quality construction and comprehensive circuit pr otection is your guar-
antee of fail-safe reliability. You can depend on consistent,stable performance even when your CD Series amplifier
is subjected to punishing extremes in the most demanding fixed or mobile sound reinforcement applications.
p.5
installation
2
unpacking
mounting
cooling and
ventilation
powering
maintenance
/
what to do with the shipping carton
/
proper rack-mounting technique
/
keeping the amplifier cooled
/
required AC line voltages
/
routine maintenance practices
CD owner’s manual
p.6
installation
2
unpacking
Please inspect the amplifier carefully immediately after unpacking.If you find any damage,notify your supplier/dealer immediately.Only the shipper may file a damage claim
with the carrier for damage incurred during shipping.Be sure to save the carton and
all packing materials for the carrier’s inspection.
If the packing materials are in good condition, please save them.
If you ever need to ship the unit anywhere without mounting it in a rack,you should
take advantage of the original factory packing materials in order to avoid unnecessary
damage.
mounting
All CD Series amplifiers mount in standard 19-inch racks and occup y tw o rack spaces.
Four front-panel mounting holes are provided on each amplifier. Rear mounting ears
give additional support and use of rear supports is highly recommended in all mobile
and touring sound systems.Handles are available as an option (P/N:C32000010).
front width 19.00" /483mm
CD dimensions
For replacement
packaging,call Crest
Audio’s
Customer Service
Department directly.
see—service and support
+
rear width 17.12" /435mm
front
height
3.47"/
88 mm
front
height
3.47"/
88mm
depth (from rack rails)16.55"/420mm
rack mount dimensions 16.05” / 407mm
1
2
3
1
2
3
2
p.7
installation
Make certain that there
is enough space around
the front and rear of the
amplifier to allow the
heated air to escape.
When mounting in a rack,
try to avoid using doors
or covers on the front
and rear of the enclosure;
the exhaust air must not
be impeded
suggestion
In racks with closed backs
allow at least one stan-
dard-rack-space opening
for every four amps.
a
cooling and ventilation
CD amplifiers use a forced air cooling system to maintain a low,even operating temperature.
Air is drawn in by a DC fan on the rear panel,flows through the cooling fins and then
exhausts through the front panel vent.
Heat sink temperature is monitored and controls the variable speed fan. Fan speed
increases only as required, keeping fan noise to a minimum.
Keep this unit 8” from any combustible surface on all sides.
If the heat sink surpasses its maximum allowed temperature , the thermal protection
circuit will activate and open the output relays allowing the amplifier to cool to a safe
temperature. Normal operation will resume once the amplifier cools to a safe level.
Thermal protect activation only occurs under extreme thermal conditions and is not
part of normal operation.
powering
Unless otherwise specified when ordered,CD amplifiers are supplied factory set to
following voltage options :
Option 1 US domestic nominal 120Vac 60Hz for rated power output
(safe operating range 100 - 132Vac )
Option 2 export models nominal 230Vac 50Hz for rated power output
(safe operating range 200 - 253Vac )
maintenance
On some CD amplifier models the fan is supplied with a removable f oam filter.This filter should be cleaned periodically with compressed air.
If the amplifier is used in an extremely dusty or smoky environment ,the unit should
be periodically blown free ( using compr essed air ) of an y for eign matter that ma y ha ve
built up inside the unit.
Users will not need to make an y adjustments to the amplifier during its lifetime.There
are no user-serviceable parts or adjustments that require opening the amplifier.
p.9
features overview
3
front panel
rear panel
/
location of connectors and controls
/
legend of panel symbols
p.10
CD owner’s manual
features overview
3
CD shown
1 2 3 4
7
5
6
98
p.11
features overview
3
front panel
1
Rack Mounting Ears
Two front-panel mounting holes are provided on each mounting ear.
2
Channel Level attenuators
Two input attenuators adjust level for their respective amplifier
channels in stereo and in parallel modes.In Bridged Mono mode,the
channel A attenuator controls overall signal level for both channels
(see rear panel mode switch description).
3
Protect
This Red LED indicates that the amp channel is in Protect mode.
During Power up, the amp briefly goes into protect mode in order
to prevent any loud spikes from being fed to the speakers. After a
few seconds the amp comes out of pr otect mode and is ready for
normal operation.If the amp stays in Protect mode,this indicates
that there may be a problem internal to the amp.If the amp goes
into Protect mode during operation this indicates that either a
problem has developed internal to the amplifier or the amplifier is
being over-stressed due to an over-current (short circuit or a load
impedance below the operating range),or thermal condition.In this
event,the amplifier should be switched OFF, and the load connections
checked for shorts and proper load impedance.If overheating is
suspected,allow the amplifier to cool and check that the airflow is
not impeded.
4
ACL / IGM
This Red LED illuminates when either the ACL or IGM protection
circuitry is engaged. See Section 6,Tourclass Protection for more
information on these Crest-exclusiv e features.
5
-24,-18, -6,0dB
The first three LEDs (-24,-18,-6,) are Green and the last led,0dB is
yellow. These LEDs respond to the incoming program material as peak
meters.Under normal operating conditions the Green LEDs illuminate
with the dynamics of the program material and the Yellow LEDflashes
during the loudest peaks.
6
Signal
Green LED varies in intensity in response to signals below -24 dB.
7
Active
Green LED illuminates when the amp is on to show that the channel
is active.
8
Fan Outlet Grill
CD Series amplifiers are cooled by a single rear-mounted fan.
Cool air flows over the heat sink and exhausts through the front grill.
Make sure this outlet remains clear to allow unrestricted airflow.
9 Power switch
This switch turns the amp on and off.If the amp doesn’t turn on when
the switch is in the ON position,check the circuit breaker on the rear
panel.
The power only breaks
one side of the AC
mains. Hazardous energy
may be present in the
enclosure when the
power switch is in the off
position.
a
p.12
features overview
3
rear panel
1
IEC power connector
Accepts a standard IEC terminated power cable
2
Breaker
Resettable circuit breaker - no fuses are used. Breaker can trip due to
a power surge or over-voltage condition. If it trips once, reset it. If it
continues to trip,the amplifier may need servicing.
3
Fan
The fan operates continuously while the amp is on. An internal
temperature sensor increases the speed of the fan during high
temperature conditions. Air enters through the r ear of the
amp and exits through the front grill.Be sure to allow adequate air
flow from the rear of the rack the amp is mounted in.
rear panel legend
input connection
XLR connector polarity
TRS connector polarity
bridged mono mode
parallel mode
stereo mode
chassis ground lifted-position
chassis ground grounded-position
output connection
speakon output
channel A stereo/parallel
channel B stereo/parallel
bridged mono
five-way binding post
channel A stereo/parallel
bridged mono
channel B stereo/parallel
1
4
5
6
3
7
8
2
CD owner’s manual
2
2
3
3
1
1
p.13
features overview
3
rear panel
4
Output connections
Speakers can be connected via the high current binding posts and
the industry-standard Speakon (NL-4) connectors.
Binding posts:One pair (Red- hot,Black- ground) per channel.
Speakons - One connector for each channel.The Speakon
connector for Channel A also contains contacts for Channel B out
put as well (see Operation Modes).
5
Ground lift switch
The recessed two-position ground lift switch is used to isolate the
amp’s signal ground from the chassis/AC ground.The factory default
setting is to the right,Grounded.To lift, or disconnect the signal
ground from the chassis/AC ground,slide the switch to the left.
Never lift the ground prong on the AC connector.
6
Input connections
Input signals can be connected to the amp via the Combi connectors,the 1/4” TRS connectors, and the Female XLR (pin 2 hot) connectors.See Connections
7
Mode selector switch
This recessed,three position switch configures the amplifier for
Stereo, Parallel or Bridged Mono operation. The default factory
setting is Stereo. See - operation modes.
8
Input sensitivity switch
This three position switch allows the user to select the input
sensitivity to .775v (0 dBu),X20,or X40 for full rated output
power.The default factory setting is X20.
Never connect a hot
(red) output to ground
or to another hot (red)
output!
a
Do not adjust the mode
selection switch while
the amplifier is turned-on.
a
In situations where an UNBALANCED signal is fed to the amp,it’s
important to ground the unused
input. If the inver ting (-) input of an
amp channel is left floating, the channels gain will drop by 6 dB. In effect,
the amp will not be as loud. For more
information about this, ask your dealer
or contact Crest Audio Technical
Support directly.
Never connect a speaker of LESS
than 2Ω minimum impedance to an
individual channels’ output connections
when operating in STEREO or PARALLEL mode.
Never connect a speaker of LESS
than 4Ω minimum impedance to
Channel A and B “+” output connections when operating in BRIDGE
mode. In BRIDGE mode oper ation, the
amplifier can produce output voltages
exceeding 120VRMS. Use extreme caution.
a
a
p.15
operation modes
4
stereo
parallel
bridged
/
choosing the appropriate mode
/
switching between operation modes
/
special considerations when using bridged mode
p.16
mode selection
The three-position,recessed Mode Select switch (located on the rear panel)
configures the amplifier for Stereo,Parallel or Bridged mode. Amplifiers are
factory-configured for Stereo mode. Shut the amp off before changing
modes.
stereo
In Stereo mode,both channels operate independently,with their input attenuators controlling their respectiv e levels.Signal at Channel A’s input produces
output at Channel A’s output,while signal at Channel B’s input pr oduces output at Channel B’ s output.Recommended minimum nominal load impedance
for stereo operation is 2 Ohms per channel.
parallel
When set to Parallel mode, program material applied to Channel A’s input
will appear at both Channel A and B outputs.The attenuators for Channel A
and B controls the level for channel A and B outputs independently of each
other.
bridged
Bridged mode straps both amplifier channels together to make a singlechannel monaural amplifier.One channel pushes and the other pulls equally ,
increasing the power output over that of either channel alone
(see Specifications).Signal is applied to the Channel A input only.Channel
A’s attenuator is used to control signal level.
Use extreme caution when operating the amplifier in Bridged mode.Never
ground either side of the speaker cable when the amplifier is in Bridged
mode;both sides are “hot.”
If an output patch panel is used,all connections must be isolated from each
other and from the panel.The recommended minim um nominal load impedance in the Bridged mode is 4 ohms,which is the equivalent to driving both
channels separately at 2 ohms.
see—connections for examples of mode-specific wirings
Connecting amplifier
outputs to oscilloscopes
or other test equipment
while the amplifier is
in bridged mode may
damage both the amplifier
and test equipment!
a
CD owner’s manual
operation modes
4
p.17
connections
5
input
XLR 1/4” TRS
Combi
output
Binding Posts
Speakons
/
proper wiring schemes for connectors:
speakon
binding post
/
correct signal paths: stereo,parallel and bridged
p.18
CD owner’s manual
connections
5
inputs
CD amplifiers are configured standard with pin 2 hot on XLR inputs.
outputs
Speakers are connected using the high-current five-way binding posts,
speakon connectors,or both.
see—operation modes
Very high current is
available at the outputs.
Please connect your
output cable to the + and
- terminals of each section precisely as shown.
a
stereo/parallel
female
XLR
bridged mono
TRS pinouts
A and B channel
Speaker + to PIN1+
Speaker - to PIN1-
A channel also has
B channel + to PIN 2+
B channel - to PIN 2 -
Note:This is useful in
bi-amp monitor situations
A Channel ONLY
Speaker + to PIN1+
Speaker - to PIN2+
p.19
connections
5
stereo mode
five-way binding post connectors
parallel mode
five-way binding post connectors
bridged mono mode
five-way binding post connectors
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
p.20
stereo mode
speakon output connectors
parallel mode
speakon output connectors
bridged mono mode
speakon output connectors
CD owner’s manual
connections
5
The Channel A Speakon
has the signal from
channel B present on PIN
2- and Pin 2 +.
This is handy in situations
where the output is driving bi-amped monitors.
a
2+
1-
2-
1+
Speaker + to PIN 1 +
Speaker - to PIN 1 -
A
-
+
1
2
3
1
2
3
2+
1-
2-
1+
Speaker + to PIN 1 +
Speaker - to PIN 1 -
+
-
B
A
-
+
1
2
3
1
2
3
+
-
B
2+
1-
2-
1+
Speaker + to PIN 1 +
Speaker - to PIN 2 +
-
+
1
2
3
1
2
3
p.21
safety
6
user
responsibility
speaker
protection
TourClass
/
the owner’s role in amplifier safety
/
protecting your speakers
/
description of TourClass protection features
p.22
CD owner’s manual
safety
6
speaker protection
All loudspeakers have electrical,thermal and physical limits which must be observed to prevent damage or failure.Cone or compression drivers can be damaged (sometimes to the point
of failure) from excessive power, low frequencies applied to high frequency drivers, severely
clipped wave f orms,and DC voltage. All CD Series amplifiers automatically protect speakers
from DC voltages and subsonic signals.
see—TourClass protection
Mid- and high-frequency transducers—compression drivers in par ticular—are highly susceptible to damage from overpo wering,clipped wave forms,or frequencies below their rated pass
band.When using an electronic crossov er,make absolutely certain that the low and mid bands
are connected to the correct amplifiers and driv ers—and not accidentall y connected to those
for a higher or lower frequency band.
The amplifier’s clipping point is its maximum peak output power. At maximum peak output
power, Crest Audio CD Series amplifiers will deliver more power than many speakers can
safely handle. Be sure the peak power capability of the amplifier is not excessive for your
speaker system. To ensure that the speakers never receive excessive power, and to prevent
amplifier clipping,use a properly adjusted external limiter (or a compressor with a ratio of 10:1
or higher) to control power output.Use one compressor/limiter for each frequency band in
systems with active electronic crossovers.
The ACL clip limiting circuit will automatically limit the duration of squared-off, continuous
wave f orms applied to the speak ers.The amplifier will,however,allow normal musical transient
bursts to pass.Of course, when the amplifier does clip,it is operating at its maximum output
power.Note that some speaker systems are packaged with proprietary “pr ocessors” that ha ve
power limiting circuits and therefore should not require additional limiting.Do not drive any
low-frequency speaker enclosure with frequencies lower than its own tuned frequency;the
reduced acoustical damping could cause a ported speaker to bottom out even at moderate
power.Consult the speaker system specifications to determine its frequency limits,and employ
a roll-off filter if necessary.
recommended speaker cabling
The wire gauge charts will assist you in determining the optimum copper wir e gauge f or y our
speaker cables.Remember that the speaker cable resistance r obs amplifier power in tw o wa ys:
through power lost dir ectly to r esistance (often r eferr ed to as I
2
R loss),and through increased
total load resistance, which decreases the amount of power available from the amplifier.
Appendix C gives cable length figures in feet/AWG wire gauges and in metric values.
see—wire gauge
user responsibility
Your CD Series amplifier is very powerful and can be potentially dangerous to loudspeakers and operators alike.It is your responsibility to read
important pr ecautions
(see the inside-front cover
) and make sure that the amplifier is installed, wired, and
operated properly as instructed in this manual.
Many loudspeakers can be easily damaged or destroyed by overpowering, especially
with the high power available from a bridged amplifier.Always be aware of the speaker’s continuous and peak power capabilities.Crest Audio is not responsible for damage
to loudspeakers for any reason.
see—speaker protection
p.23
safety
6
TourClass®protection
Just like Crest Audio’s highly acclaimed Pro series amps, CDseries amps incorporate
TourClass protection features. Derived from Crest Audio’s extensive experience with the
world’s largest sound rental companies, the TourClass group of circuits sets the industry
standard for assured protection of internal amplifier circuits and all connected loads.
ACL A CTIVE CLIP LIMITING
At the amplifier’s full power limit, or clipping point, ACL
will be activated. This is indicated
by illumination of the
ACL / IGM LED.The channel gain is automatically reduced, protecting
the loudspeakers from potential damage fr om the high pow er,continuous square wav es that
would otherwise be produced.
ACL ma y be activated b y uncontrolled feedback,oscillations,
improper equipment gain settings,or an equipment malfunction upstream from the amplifier. Only steady or excessive clipping
(
not normal program transients)
will trigger ACL. The
circuit is virtually transparent in operation and full signal bandwidth is maintained.
IGM INST ANTANEOUS GAIN MODULATION
IGM is an innovative circuit that allows the amplifier to operate safely into loads as low as 4
ohms.When the amplifier sees a load that ov erstresses the output stage,the
IGM circuit adjusts
the channel gain to a safe level.This gain control circuit is inaudible in normal use.In addition,
if extreme and sustained low impedance is encounter ed,the amplifier’s output r ela y will open.
AutoRamp
Auto Ramp operates every time the amplifier is turned on or is reactivated after a protect
condition is corrected.This exclusiv e Crest Audio feature gradually incr eases gain to the attenuator setting avoiding unnecessary stress on the loudspeakers.
Thermal Protect
Abnormally high heat sink temperatures will engage the Protect circuit and disconnects the
output relays.During this time the Prot LEDs will light red.The cooling fan will continue running at high speed.Normal operation resumes once the amplifier cools to a safe level.
Short Circuit
If an output is shorted (i.e. defective speakers or crossed speak er wir es) the output r elays will
open and the channel will shutdown.After approximately 2 seconds the channel will attempt
an AutoRamp re-start.If the short is still present the cycle will repeat. If the short is removed
the channel will complete a re-start and operate correctl y.
DC Voltage
If an amplifier channel detects DC voltage at its output terminals,the output relay will immediately
open to prevent loudspeak er damage. The protect LEDs illuminate.
Subsonic Frequencies
Built-in high pass filtering provides subsonic fr equency pr otection for each channel.In addition,
a relay will open if excessive subsonic energy appears
at the output.
p.25
service and support
7
/
when to get support
/
ways to contact Crest Audio
support
contact us
p.26
support
In the unlikely event that your amplifier develops a problem, it must be
returned to an authorized distributor, service center, or shipped directly to
our factory.
To obtain service, contact your nearest Crest Audio Service Center,
Distributor, Dealer, or any of the worldwide Crest Audio offices. For those
with Internet access,please visit the Crest Audio web site.
contact us
customer service
phone 201.909.8700 USA
fax 201.909.8744 USA
email customerserve@crestaudio.com
technical support
phone 201.909.8700 USA
fax 201.587.0550 USA
email techserve@crestaudio.com
web site
www.cr estaudio .com
mail
Crest Audio Inc.
16-00 Pollitt Drive
Fair Lawn,NJ 07410 USA
For replacement
packaging,call Crest
Audio’s Customer Service
+
CD owner’s manual
service and support
7
p.27
Stereo power 8Ω
4Ω
2Ω
1
Bridged mono power 8Ω
4Ω
1
Maximum output voltage rms each channel
Frequency response 1W @ 8Ω
Power bandwidth @ rated power
Damping Factor
Input cmrr
Input sensitivity for full rated output power
Input impedance
Hum and noise
(A-weighted below rated power)
Crosstalk
Class
Circuit breaker rating
120 Vac
Circuit breaker rating 230Vac
Current draw 1/8 power, 4Ω 120 Vac
Current draw 1/3 power, 4Ω 120 Vac
Current draw idle 120
Vac
Thermal emissions 1/3 Power, 4Ω, BTU/HR
Cooling
Input connectors,
per channel
Output connectors
Controls
LED indicators
TourClass protection
Construction
Dimensions
Weight
net
1000 1500 2000 3000
CD Series
1kHZ, 0.2%THD+N
1
1kHZ, 0.4%THD+N
280
W 400W 560W 800W
500W 750W
1000W 1500W
500W 750W
1000W 1500W
1000W 1500W 2000W 3000W
1000W 1500
W 2000W 3000W
53 Vrms 64 Vrms
72 Vrms 85 Vrms
20Hz–20kHz, +1/-1dB 20Hz–20kHz, +1/-1dB 20Hz–20kHz, +1/-1dB 20Hz–20kHz, +1/-1dB
20Hz–20kHz, +1/-1dB 20Hz–20kHz, +1/-1dB 20Hz–20kHz, +1/-1dB 20Hz–20kHz, +1/-1dB
400:1 @ 8Ω 400:1 @ 8Ω, 400:1 @ 8Ω, 400:1 @ 8Ω,
60dB @ 1 kHz 60dB @ 1 kHz 60dB @ 1 kHz 60dB @ 1 kHz
0.775V / X20 / X40 0.775V / X20 / X40 0.775V / X20 / X40 0.775V / X20 / X40
20K balanced / 20K balanced / 20K balanced / 20K balanced /
10K unbalanced 10K unbalanced 10K unbalanced 10K unbalanced
>-100dB
>-100dB >-100dB >-100dB
>-60dB @ 1kHz below rated power
>-60dB @ 1kHz below rated power >-60dB @ 1kHz below rated power
DDDD
10A 12A 15A 20A
6A 8A 10A 12A
2.6A 3.6A 4.5A 7.0A
5.3A 7.5A 9.6A 14.0A
1.0A 1.1A 1.25A 1.5A
484 614 781 1024
Back to front via variable speed fan (all models)
Female XLR pin 2+, 1/4” TRS Combo connectors (all models)
Speakon connectors and 5 way binding post (all models)
Front panel: two attenuators, power switch. Rear panel: signal ground-lift, mode select, circuit breaker (all models)
ACL, IGM, protection, 5 segment bargraph VU meter, Active (all models)
ACL, IGM, AUTORAMP. short circuit, DC Voltage Turn ON/OFF transient,
current in-rush, sub/ultrasonic input (all models)
16 guage steel chassis
Inches: 3.5 height x 19 width x 15.3 depth / MM: 89 height x 483 width x 389 depth (all models)
30 lbs / 13.6 kG 35 Lbs / 15.9 kG 38 Lbs / 17.2 kG 41.4 Lbs / 18.8 kG
specifications
a
p.28
CD owner’s manual
block diagramboptional handle installation
Channel A
Inputs
1/4
TRS
Female
3-Pin XLR
Channel B
Inputs
1/4
TRS
Female
3-Pin XLR
Channel A
A
ATTENUATOR
1
3
2
B
GAIN
SWITCH
-
MODE
SWITCH
C
B
A
A: PARALLEL
1
3
2
B: STEREO
C: BRIDGED
ATTENUATOR
0.775V
A
X20
X40
0.775V
X20
X40
B
OUTPUT STAGE
ACL, IGM,
DC PROTECT,
AUTORAMP
THERMAL
VU METER
OUTPUT STAGE
ACL, IGM,
DC PROTECT,
AUTORAMP
THERMAL
VU METER
OUTPUT
RELAY
OUTPUT
RELAY
OUTPUT CONNECTION DETAILS
Outputs
5-Way
Binding Posts
Channel B
Outputs
5-Way
Binding Posts
SEE SECTION 5 FOR
Neutrik
Speakon
Neutrik
Speakon
c
p.29
The CD amplifiers can be outfitted with optional handles. This option requires (2) CD series handles
(P/N C32000010) and (4) #8-32 1/2” undercut flat head screws (P/N C38000008). You may order
these from your dealer or directly from Crest Audio.
p.30
stranded cable length
0.3mm
2
0.5
0.75
1.5
2.5
4.0
2.9%
1.74
1.16
0.58
0.35
0.22
5.6%
3.4
2.3
1.16
0.70
0.44
10.8%
6.7
4.5
2.3
1.39
0.87
0.5mm
2
0.75
1.5
2.5
4
6
4.3%
2.9
1.45
0.87
0.55
0.37
8.2%
5.6
2.9
1.74
1.09
0.73
15.5%
10.8
5.6
3.4
2.2
1.45
0.5mm
2
0.75
1.5
2.5
4
6
8.24%
5.6
2.9
1.74
1.09
0.73
5.5%
10.8
5.6
2.9
1.74
1.09
28%
19.9
10.8
6.7
4.3
2.9
0.75mm
2
1.5
2.5
4
6
10
15.5%
8.2
5.1
3.2
2.2
1.31
0.73%
15.5
9.8
6.3
4.3
2.6
45%
28
18.2
12.0
8.2
5.1
2
meters
5
meters
10
meters
30
meters
wire gauge power loss
8Ω load 4Ω load 2Ω load
wire gauge
d
CD owner’s manual
p.31
stranded cable length
18AWG
16
14
12
10
0.81%
0.51
0.32
0.20
0.128
1.61%
1.02
0.64
0.40
0.25
3.2%
2.0
1.28
0.80
0.51
18AWG
16
14
12
10
1.61%
1.02
0.64
0.40
0.25
3.2%
2.0
1.28
0.80
0.51
6.2%
4.0
2.5
1.60
1.01
18
AWG
16
14
12
10
8
6.2%
4.0
2.5
1.60
1.01
0.60
11.9%
7.7
5.0
3.2
2.0
1.20
22%
14.6
9.6
6.2
4.0
2.4
18AWG
16
14
12
10
8
11.9%
7.7
5.0
3.2
2.0
1.20
22%
14.6
9.6
6.2
4.0
2.4
37%
26
17.8
11.8
7.7
4.7
5
feet
10
feet
40
feet
80
feet
wire gauge power loss
8Ω load 4 Ω load 2 Ω load
wire gauge
d
http://www .crestaudio.com CDOwner's Manual Version 1.1 10/14/04
P/N 80305114
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