POWER PROCESSING
AMPLIFIERS
Protect
Active
ACL
ACL
On
Off
Ch
A
Ch
B
Remote
Signal
Signal
CKS 800
Professional Power Amplifier
Protect
Active
ACL
ACL
On
Off
Ch
A
Ch
B
Remote
Signal
Signal
CKV 80 0
Professional Power Amplifier
Protect
Active
ACL
ACL
On
Off
Ch
A
Ch
B
Remote
Signal
Signal
CKX 500
Professional Power Amplifier
OWNER’S MANUAL
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Power Amplifier Owner’s Manual
Table of Contents.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Quick Set-Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installation and Mounting . . . . . . . . . . . . . . . . . . . . . . . . 3
Front Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Side Panels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Input Bay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Input Module Jumpers. . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Network Bay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Power/Output Bay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Module Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Signal Ground Lift Jumper . . . . . . . . . . . . . . . . . . . . . . . 8
TourClass® Protection Features . . . . . . . . . . . . . . . . . . . . 9
Sequential Turn-On/Off. . . . . . . . . . . . . . . . . . . . . . . . . 10
Service Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
CKS Series Specifications . . . . . . . . . . . . . . . Appendix A
CKV Series Specifications. . . . . . . . . . . . . . . Appendix B
CKX Series Specifications. . . . . . . . . . . . . . . Appendix C
Wire Gauge Charts. . . . . . . . . . . . . . . . . . . . . Appendix D
Distributed/Constant Voltage Systems . . . . . . Appendix E
Crest Audio CK Power Processing Amplifiers
Page 1
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Introduction.
Congratulations on your purchase of a Crest Audio CK family of By combining legendary Crest performance with three unique plug-in
Power Processing amplifiers. Please read this manual carefully (espe- module bays located on the rear panel, these amplifiers can become
cially the the “Important Precautions” section located inside the front very sophisticated audio processors. The CK family is everything that
cover) as it contains information vital to the safe operation of the you expect from Crest Audio. They are ruggedly built from high qual-
amplifier. Also, please fill out and return the enclosed product regis- ity components, intelligently laid out, and possess comprehensive pro-
tration card.
tection features.
The CK Power Processing amplifiers represent new levels of value After-sale support is considered paramount at Crest Audio. For any
and flexibility never before offered to the contracting market. CKS assistance in the set-up or operation of this product please call Crest
Series models are specially designed to drive low impedance speaker Audio’s Customer Service department or your local Crest Audio rep-
loads - down to two ohms with “-2” models,. CKV Series models fea- resentative. Should you have any problems at all, or suggestions that
ture a unique proprietary front end circuit to provide directly coupled may help us improve our products or service, please contact us. We
70.7 volt outputs, eliminating the need for step-up transformers. CKX encourage your participation in Crest’s future. (See back cover for
Series models feature transformer-isolated outputs for 100V opera- contact info).
tion (50V optional). Together, these amplifiers cover almost every
conceivable installed or distributed sound power requirement.
Crest Audio may also be contacted on the World Wide Web at:
Front View
4U-6.94" / 176mm
CKS1200-2
Cooling
CKS1600-2
CKV1600
CKV2400
Air
3U-5.13" / 130mm
Intake
CKS800
CKS800-2
CKV800
CKX150
CKX300
CKX500
CKX800
2U - 3.44" / 87mm
CKS100 CKV100
CKS200 CKV200
CKS400 CKV400
On
Off
ACL
Protect
Active
ACL
Signal
Signal
CKS 400
Remote
Professional Power Amplifier
19"
1
1 2 34 5
6
7
Side View
4U-6.94" / 176mm
CKS1200-2
CKS1600-2
CKV1600
CKV2400
3U-5.13" / 130mm
CKS800
CKS800-2
CKV800
CKX150
CKX300
CKX500
CKX800
2U - 3.44" / 87mm
CKS100
CKS200
CKS400
CKV100
CKV200
CKV400
Heated Air Exhaust
Heated Air Exhaust
8
17.125"/435mm
Page 2
Crest Audio CK Power Processing Amplifiers
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Unpacking.
Front Panel.
Upon unpacking, inspect the amplifier. If you find any damage, noti-
fy your supplier immediately. Only the consignee may institute a
claim with the carrier for damage incurred during shipping. Be sure
to save the carton and all packing materials. Should you ever need to
ship the unit back to Crest Audio, one of its offices, service centers,
or the supplier, use only the original factory packing. If the shipping
carton is unavailable, contact Crest to obtain a replacement.
1. Rack Mounting Ears.
Two to four mounting holes are provided on each front mounting
ear.
2. Three-position AC Power Switch.
A three-position switch is on the front panel. With the switch pushed
towards the upper position the amplifier is On. The middle position
is Off and the lower position is marked Remote. When switched to
Remote, the amplifier must be activated by the sequential turn
on/turn off (STO) circuit. (CK amplifiers are shipped with the CC-
STL Power/Output module standard, which permits STO. If NexSys
compatible modules are used, STO can also be performed under
NexSys computer control.) When a voltage of +8 to +18V DC is
applied to the rear-mounted STO terminal and the “In” terminal is
connected to the “Com” terminal, the amplifier will turn on. When
no voltage is present or the In-Com connection is opened, the ampli-
fier will switch off. Other CK Power Processing amplifiers can be
“daisy-chained” together and will turn on at 200ms intervals. See the
section on Sequential Turn-On/Turn-Off for more information about
STO.
Amplifier Quick Set-Up.
Crest Audio CK Power Processing amplifiers are configured to a
standard set-up at the factory. They are functional and ready to use
‘out of the box’. All controls and input/output connections are clear-
ly labeled. Units are shipped standard with modules as follows:
Input Bay: CC-IPB Module.
Network Bay: CC-BLK (Blank) Module.
Power/Output Bay: CC-STL Module.
To set the amplifier up for basic usage:
1. Rack mount the amplifier in the location where it is to be used,
remembering to allow for adequate access and cooling space. For
more information, see the sections on Installation, Mounting, and
Cooling Requirements.
3. Protect LED.
If the amplifier is in Protect mode, the output relay will open, and
this LED will light.
4. Active LED.
2. Make input connections to the input barrier strips on the Input
Module. Be sure to make the correct connections for stereo, par-
allel, or bridged mono configuration. See the sections on Mode
Configuration and Input Module Connections and Controls for
more information.
The Active LED indicates the amplifier is turned on.
5. Signal LED.
Each channel has a Signal LED, which comes on gradually, first
dim, and then brighter as the signal level increases.
6. ACL LED.
3. Connect speakers to the output barrier strips on the Power/Output
Module. Be sure to make the correct output connections for
stereo, parallel or bridged mono configuration. See the section on
Power/Output Module Connections for more information.
Each channel has an ACL (Active Clip Limiting) LED. This LED
comes on at the clipping point, and indicates that ACL is engaged.
See the section on TourClass Protection for more information.
7. Fan Grill & Filter.
4. Make power connections, allowing for proper current draw. See
the section on Connecting Power/Circuit Size Requirements for
more information.
A high-efficiency DC fan (with continuously variable speed) mount-
ed behind the fan filter & fan intake grill draws cooling air into the
amplifier. Do not block this intake! The fan operates only when the
amplifier heatsinks require cooling. Fan filters are easy to remove
and must regularly be cleaned to ensure optimum performance.
5. Turn the front panel three-position AC switch to 'on', and bring
up the rear panel gain attenuators to the desired levels.
Installation and Mounting.
Side Panels.
CK Power Processing amplifiers are 2, 3 & 4-rack space units of 17
1/8" (437mm) depth that mount in a standard 19-inch rack. On all
amplifiers except 4-rack space units, four front panel mounting holes
are provided. (4-rack space units have eight front panel mounting
holes). Rear mounting ears are also provided on all amplifiers for
additional support, which is essential in non-permanent installations
like mobile or touring sound systems, but recommended for perma-
nent installations as well.(Distance from the back of the front rack
ear to the center of the rear mounting ear holes is 16 5/8" / 422mm )
Because of the cables and connectors on the rear panel, a right-angle
or offset screwdriver or hex key will make it easier to fasten the rear
mounting ears to the rails. Dimension drawings are included on page
4.
8. Exhaust Ports.
Heated air exits through the exhaust ports, located on the sides of the
amplifier chassis. Do not block these ports when rack-mounting the
amplifier. See Side View.
Crest Audio CK Power Processing Amplifiers
Page 3
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A barrier strip is provided for connection of loudspeakers with bare
wire or spade lug connectors. A signal ground lift jumper permits the
audio ground to be lifted from the chassis ground. For more informa-
tion see the sections on Signal Ground Lift Jumper, Module
Removal, and Sequential Turn-On/Turn-Off.
Rear Panel.
Module Bays & Modules.
The rear panel of CK Power Processing amplifiers provides three
bays (Input, Network and Output/Power) configured to accept inter-
changeable plug-in modules. Your amplifier may have been factory-
configured with some of the optional modules. In this case, info on
the relevant modules will be enclosed in the amplifier box, or in a
separate binder. If all required information is not included, please
call Crest Audio’s Customer Service department or your local Crest
Audio representative.
12. Network Bay.
The CC-BLK (blank panel) comes standard with all amplifiers. See
the section on Replacing or Installing a Network Module for more
information.
13. Input Bay.
About CC Modules and NC Modules.
CK Power Processing amplifiers come standard with a CC-IPB Input
module. Barrier strip input connectors and individual channel rotary
attenuators are provided. All Input modules have an internal voltage
gain/input sensitivity jumper that is factory-set for X40 gain. See the
sections on Input module Connections and Removing or Replacing
an Input module for more information.
CC modules fit into the Power/Output or Input module bays in the
rear panel of CK Power Processing amplifiers. These "basic" analog
modules are non-programmable and non-NexSys® compatible; only
the STO function can be controlled (through hardwiring).
NC Modules can be controlled, programmed and/or monitored. They
fit into the rear panel of the amplifiers. NC Input Modules can be
controlled and/or programmed over the NexSys network or via the
N-Coder (Hand-Held) or N-Coder/PC software. (NexSys is Crest
Audio’s hardware and software package that offers network connec-
tion of Crest Audio amplifiers and associated devices.). NC Input
and NC Output/Power Modules are NexSys-compatible. Using
NexSys with the appropriate NC Network Module, NC Input and
Output/Power Modules can be controlled, programmed and/or moni-
tored remotely. NexSys also offers a number of diagnostic facilities.
On the NC Input Modules, the individual channel attenuators offer
manual level adjustment and removable knobs for additional securi-
ty. Except for the STO feature, NC Modules are “tamper-proof” in
that there are no user-accessible setup controls.
Operation.
Connecting Power/Circuit Size Requirements.
CK Power Processing amplifier power requirements are rated at
“idle”, 1/8th power (“typical” music conditions), 1/3rd power, and
maximum rated power. The maximum power current draw rating is
limited by the amplifier's circuit breaker. Consult the specifications
at the end of this manual for the current that each amplifier will
demand. AC mains voltage must be the same as that indicated on the
rear of the amplifier. Damage caused by connecting the amplifier to
improper AC voltage is not covered by any warranty. Note: Always
turn off and disconnect the amplifier from the mains voltage before
making audio connections. If possible, as an extra precaution, have
the attenuators turned down during power-up.
9. Circuit Breaker.
A re-settable, protective AC circuit breaker is located at the upper
left of the amplifier rear panel. Two and three rack space amplifiers
have a push-type breaker fitted, while four rack space units have a
throw-switch style breaker. If the breaker has tripped, push it back in
(or, in the case of four rack space units, flip the breaker up) to return
the amplifier to operating condition. If the breaker trips repeatedly,
the amplifier needs servicing.
Cooling Requirements.
CK Power Processing amplifiers use a forced-air cooling system to
maintain a low, even operating temperature. Drawn by a continuous-
ly-variable-speed fan mounted behind the front panel, air enters
through the front grill and courses through the cooling fins of the
heat sink, (which dissipates power transistor heat), before exiting
through the side panel ports. The fan will remain inactive until oper-
ating temperature rises above 45° C. Make sure that there is enough
space around the front of the amplifier to allow air to enter, and
around the sides to allow the heated air to exit. (See page 4 for intake
and exhaust locations. Note: If the amplifier is rack-mounted, do not
use doors or covers on the front or rear without pressurizing the
rack. Whatever type of rack you are using, make sure that heated air
can escape freely, and that there is no resistance to the intake of cool
air through the front grill. Intake and exhaust air must flow without
resistance. Ensure that fan filters are regularly cleaned and periodi-
cally replaced. (No tools are required for filter removal).
10. IEC Power Connector with removable Power Cord or
Captive Power Cord.
On two rack space amplifiers, a standard IEC power connector is
located at the lower left corner of the amplifier rear panel. An AC
mains cord having an appropriate AC plug for the intended operating
voltage is included. Three and four rack space units have a captive
power cord.
11. Power/Output Bay.
All Power/Output modules (CC-STL module is shipped standard)
provide a ground lift jumper, barrier strip output connectors, and
connections for sequential turn-on /off (STO) activation.
Rear
View
CLASS
2
WIRING
MAY BE USED
Output
–
Model
Name
Output Power
@70.7V
Model
Name
Output Power
@8Ω/Ch.
5
5
Level
A
4
4
6
6
CKS 100
CKS 200
CKS 400
CKS 800
CKS 800-2
CKS 1200-2
CKS 1600-2
50W
CKV 100
CKV 200
CKV 400
CKV 800
CKV 1600
CKV 2400
50W
100W
200W
400W
800W
1200W
3
7
+8 to +18VDC
20 mA
100W
200W
400W
400W
600W
800W
2
8
A
1
9
10
LISTED 8B42
COMMERCIAL
POWER
+
0
3
In
AMPLIFIER
120V~60 Hz 15A
Level
B
Out
Com
Input A
–
Input B
–
+
B
–
7
Designed & manufactured in the USA by:
2
1
8
+
+
Model
CC-BLK
NEC
ONLY
9
10
CLASS
2
0
Signal
Ground
Lift
Jumper
Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
Model
CC-STL
Model
CC-IPB
9 10
11
12
13
Page 4
Crest Audio CK Power Processing Amplifiers
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Parallel Mode Diagram
PowerSave.
All CK Power Processing amplifiers come standard with PowerSave
circuitry. This effectively reduces current draw and thermal emis-
sions to a minimum when the amplifier is at idle. PowerSave oper-
ates by cutting off the bias current to the output stage after signal
absence is sensed at the input. Once signal is present, PowerSave
instantly restores the bias current after the first positive-going wave-
form. Current draw specifications while PowerSave is active are
included in specifications under "Idle Current Draw."
-
+
CLASS
2
WIRING
MAY BE USED
Output
–
5
5
Level
A
4
4
6
6
3
7
+8 to 18VDC
20 mA
2
8
A
1
9
10
LISTED 8B42
COMMERCIAL
POWER
+
0
3
In
AMPLIFIER
Level
B
120V~60 Hz 15A
Out
Com
Input
–
A
Input
–
B
7
+
B
–
2
1
8
+
+
NEC
ONLY
9
10
CLASS
2
0
Signal
Ground
Lift
Jumper
Model
CC-IPB
Model
CC-STL
-
+
+
-
Thermal Emissions.
System cooling needs must be considered before installation, and the
system installer/designer should specify appropriate countermea-
sures, such as ventilation, air conditioning, etc. Refer to the specifi-
cations appendix at the back of this manual for specific thermal
emissions figures.
Bridged Mono Mode - CKS Series Power Amplifiers.
Bridged Mono Mode straps both amplifier channels together, making
a very powerful single channel amplifier. One channel “pushes” and
the other “pulls” equally, effectively quadrupling the power over that
of either channel alone. Signal is connected to the input barrier strip
as shown in the drawing below, with one jumper connecting the pos-
itive (+) terminal of Input A to the negative (-) terminal of Input B,
and another jumper connecting the negative (-) terminal of Input A
to the positive (+) terminal of Input B. Both channel attenuators
(A&B) are used to control signal level, and both must at the same
level, preferably at 0dB attenuation. The speakers are connected only
to the designated “+” output terminals as shown below.
Mode Configuration.
CK Power Processing amplifiers are configured standard for two
channel (stereo) operation. They can, however, be wired to operate
in bridged mono mode (a single Mono input amplified to the com-
bined power of both channels and made available as a single Mono
output) or parallel mode (where a single Mono input signal is fed to
both channels).
Two Channel (Stereo) Mode.
Note: Use extreme caution when operating in bridged mono mode.
Never ground either side of the speaker cable when the amplifier is
in bridged mono mode; both sides are “hot.” If an output patch
panel is used, all connections must be isolated from each other and
from the panel. For CKS Series amplifiers, the recommended mini-
mum nominal load impedance in bridged mono mode is 8 ohms, the
equivalent to driving both channels at 4 ohms. [For models CKS
800-2, 1200-2 and 1600-2, the recommended minimum nominal load
impedance in the bridged mono mode is 4 ohms, equivalent to dri-
ving both channels at 2 ohms].
In the factory configured, standard two channel (stereo) mode, both
channels operate independently, individual input attenuators control-
ling their respective levels. Signal at Channel A’s input produces
output at Channel A’s output, while signal at Channel B’s input pro-
duces output at Channel B’s output. (Recommended minimum nomi-
nal load impedance for stereo operation of CKS Series amplifiers is
4 ohms per channel; 2 ohms per channel for models CKS 800-2,
1200-2, and 1600-2. CKV and CKX Series amplifiers are specifical-
ly designed for use with distributed or constant voltage systems. See
appendix E for information on recommended distributed line imped-
ance.). Connect loudspeakers to the barrier strip output connectors
for channels A and B. Connections are shown in the diagram below.
Note: Driving loads of less than the recommended minimums will
activate the IGM circuitry, resulting in a loss of power, and may also
cause a thermal protect condition.
Parallel Mode.
To send the same signal to both channels, connect the input signal to
Channel A via the Input Barrier Strip. Run jumpers from the positive
and negative terminals of Channel A’s Input Barrier Strip to the
respective terminals of Channel B’s. Both channels then share
Channel A’s input signal, but will operate independently. Speakers
are connected as in Stereo Mode.
Bridged Mono Mode Connection Diagram.
CLASS
2
WIRING
MAY BE USED
Output
–
5
5
Level
A
4
4
6
6
3
7
+8 to 18VDC
20 mA
2
8
A
1
9
10
LISTED 8B42
COMMERCIAL
POWER
+
0
3
In
AMPLIFIER
Level
B
120V~60 Hz 15A
Out
Com
Input
–
A
Input
–
B
7
+
B
–
2
1
8
+
+
NEC
ONLY
9
10
CLASS
2
0
Signal
Ground
Lift
Jumper
Model
CC-STL
Model
CC-IPB
Stereo Mode Connection Diagram
-
+
+ -
Ch.A
-
+
CLASS
2
WIRING
MAY BE USED
Output
–
5
5
Level
A
4
4
6
6
3
7
+8 to 18VDC
20 mA
2
8
Bridged Mono Mode - CKV & CKX Series.
A
1
9
10
LISTED 8B42
COMMERCIAL
POWER
+
0
3
In
AMPLIFIER
Level
B
120V~60 Hz 15A
Out
Com
Input
–
A
Input
–
B
7
+
B
–
2
1
8
+
+
9
10
NEC
CLASS
2
ONLY
CKV and CKX Series amplifiers can also be
wired for Bridged Mono mode operation.
0
Signal
Ground
Lift
Jumper
Model
CC-IPB
Model
CC-STL
-
+
However, bridging these models is usually unde-
sirable, as the resultant output will be approxi-
mately 140V (CKV) or 200V (CKX)! There are,
however, specific applications for this configura-
tion. Contact Crest Audio Customer Service for
more information if required.
+ -
+
-
Regardless of operating mode, NEVER
connect amplifier outputs together!
Crest Audio CK Power Processing Amplifiers
Page 5
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all input NC modules), labeled “W1 W2 W3”, are used to set the
overall gain of the amplifier. The 3 positions allow the amplifier to
be set for constant gain of X20 (26 dB), X40 (32 dB), OR constant
sensitivity for full output (.775V) at 0 dBu input. The standard facto-
ry setting is for X40 (32dB). (Refer to the specifications for more
gain/sensitivity information). The diagram below shows the location
of these jumpers. All jumpers must be set to the same position as
indicated in the drawing below. To change jumper settings, the Input
module must first be removed from the amplifier chassis. This opera-
tion is covered in the section "Module Removal/Replacement".
Input Bay.
Input Module Connections and Controls.
Input barrier strips have a 0.325" (8.3mm) center and 0.270"
(6.9mm) lug space. For connecting to the input barrier strips, a wire
gauge between 14 AWG (2.5mm2) & 24 AWG (0.25mm2), and spade
lugs (Panduit Part No. PNF 18-6LF-C or equivalent) are recom-
mended.
Input Module Connections and Controls Diagram.
N-Coder Setup Jumpers.
SEE INSTRUCTION MANUAL
All NC Modules have internal jumpers used to set the module for
operation with NexSys or N-Coder. These jumpers are labeled “W4
W5” on the Input module circuit board. The “NC-NXS” jumper posi-
tion allows operation with NexSys, while the “NCODE” jumper
position permits the Input module to be programmed through N-
Coder or N-Coder/PC software when the amplifier is off . Note:
Factory setting is the 'NexSys' position. If NexSys, N-Coder, or N-
Coder/PC software is not being used, jumper position will have no
effect upon the operation of the amplifier.
Level
A
5
5
4
4
6
6
3
7
2
1
8
9
10
0
3
Level
B
Input A
–
Input B
–
7
2
1
8
+
+
9
10
0
Model
CC-IPB
Gain Select Jumpers Diagram.
Input Level
Attenuators
Channel A Jumper
Channel B Jumper
NexSys Indicator Jumper (NC-IPN Only)
Input Barrier Strip
Removable Attenuator Knobs.
The attenuator knobs can be removed and replaced with blanking
plugs. These plugs are shipped with the amplifier. The procedure for
attenuator knob removal is as follows:
26dB
0dBu
+32dB
dB
dBu
+32dB
B
Bu
+32dB
+26dB
0dBu
+32dB
+26dB
0dBu
+32dB
+26dB
0dBu
+32dB
1. With an X-Acto or similar knife, pop off the grey key cap of
the attenuator knob. This will reveal the inside nut.
.775V / 0 dBu (For Full Power)
X40 (+32dB) Standard Factory Setting
X20 (+26 dB)
2. Using a needle nose pliers or appropriate size nut driver,
loosen the inside nut.
N-Coder/NexSys Setup Jumpers Diagram.
3. Slide the attenuator knob off the shaft.
4. Insert a regular screwdriver in the slotted end of the shaft, and
adjust attenuation to desired level.
N-CODE
NC-NXS
N-CODE
NC-NXS
5. Blanking plugs may now be inserted in the attenuator holes.
Unbalanced Sources.
For use with an unbalanced source, tie the inverting (minus) input to
ground by installing a jumper across the appropriate barrier strip ter-
minals. If the inverting input is left floating, a 6 dB loss in gain will
result. See the diagram below.
N-Coder Setup
NexSys Setup
Input Module Jumpers Location Diagram - CC-IPB.
Input Balanced /Unbalanced Connections Diagram.
SEE INSTRUCTION MANUAL
Level
A
5
5
4
4
6
6
3
7
2
1
W1
W2
A
B
8
9
10
0
3
Level
B
Input A
–
Input B
–
7
2
1
8
+
+
9
0
10
Input Gain/Sensitivity Jumpers
Model
CC-IPB
Input Module Jumpers Location Diagram - NC-IPN shown.
Input Gain/Sensitivity Jumpers
–
–
+
+
Balanced
Input
Unbalanced
Input
W2
W3
W1
+26dB
Input Module Jumpers.
0dBu Sen
+32dB
N-CODE
NC-NXS
Gain Select Jumpers.
W4W5
Input modules have user-settable jumpers to configure Input
Gain/Sensitivity. These internal jumpers (two for CC-IPB, three for
Nexsys / N-Coder Jumpers
Crest Audio CK Power Processing Amplifiers
Page 6
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Network Bay.
Network Module Controls/Connections.
CK Power Processing amplifiers come standard with a blanking
panel fixed over the Network bay. When a Network module is
installed in this bay, network connection is made via a pair of three-
pin connectors. They are wired in parallel, and form a loop-through
connection. (Mates for these connectors are shipped with the
Network module.) Network bus addressing is accomplished through
use of the Hi and Lo Address dials. Refer to module documentation
for exact connection and control information.
If Load Monitoring is
employed, an additional ribbon
cable will be located here.
Network Bay Controls/Connections Diagram.
Designed
&
manufactured in the USA by:
Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
Model
Name
Output Power
@70.7V
Model
Name
Output Power
@8Ω/Ch.
CKS 100
CKS 200
50W
CKV 100
CKV 200
CKV 400
CKV 800
CKV 1600
CKV 2400
50W
100W
200W
400W
800W
1200W
100W
200W
400W
400W
600W
800W
CKS 400
CKS 800
CKS 800-2
CKS 1200-2
CKS 1600-2
Network Module
Input Module
Network
Address
Model
NC-NXS
General Module Setup Diagram.
Data
0
0
4
4
8
8
+
–
+
–
Hi
Lo
Amplifier is shown with the top cut away for
clarity only. Dangerous voltages exist inside,
and only a Crest Audio-certified service
technician should remove top cover !
NexSys Network Network Bus
Connectors Address Selectors
The amplifier must be switched off and the
mains plug removed from the supply before
module removal operation is undertaken.
Power/Output Bay.
Power/Output Module Connections.
Speakers are connected using the Output Barrier Strip connectors.
Spade lugs, ring tongues or bare wire may be connected to the output
barrier strip elements. Spade Lug measurements for Output barrier
strip are as follows: .44" (11mm) screw spacing, .32" (8mm) lug
space. For output spade lugs, Panduit Part No. PNF 14-8LF-C (or
equivalent) is recommended. (Consult the wire gauge charts in theis
manual for speaker wiring recommendations.) Make sure the ampli-
fier is turned off before you change any output connections or
jumpers. Also ensure that the load impedance being connected is not
less than the amplifier's ability to drive it.
Removing or Replacing an Input Module.
The amplifier must be switched off and unplugged from the mains
supply before this operation is undertaken. Remove the four #8 3/8"
Phillips pan head sheet metal screws that secure the module to the
chassis. The module is connected electrically to the amplifier via
multi-pin ribbon cables. Unplugging the module from the ribbon
cable connectors frees the module for removal. To insert the same or
another module, simply reverse this procedure, making sure that any
ribbon cable connectors are properly and securely seated. Note: The
amplifier must not be operated without an Input module in place.
On the standard CC-STL Power/Output module, a four-pin
Sequential Turn-On/Turn-Off (STO) connector is suppled. A mating
connector is shipped with the amplifier. For more information on
STO, see the section on Sequential Turn-On/Off.
Input Module Removal Diagram - CC-IPB.
2
WIRING
Model
Name
Output Power
@70.7V
Model
Name
Output Power
@8Ω/Ch.
BE USED
ut
CKS 100
CKS 200
50W
CKV 100
CKV 200
CKV 400
CKV 800
CKV 1600
CKV 2400
50W
100W
200W
400W
800W
1200W
100W
200W
400W
400W
600W
800W
CKS 400
CKS 800
CKS 800-2
CKS 1200-2
CKS 1600-2
Power/Output Module
Connections Diagram.
CLASS
2
WIRING
MAY BE USED
Output
–
Designed
&
manufactured in the USA by:
Model
CC-BLK
+8 to 18VDC
20 mA
l
A
nd
er
Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
+
In
Out
Com
+
B
–
NEC
ONLY
CLASS
2
Signal
Ground
Lift
Jumper
SEE INSTRUCTION MANUAL
Model
CC-STL
Level
A
5
5
4
4
6
6
3
7
2
1
8
9
10
Output Barrier Strip
0
3
Level
B
Input
–
A
Input
–
B
7
2
1
8
Sequential Turn-On/Off
(STO) Connector
+
+
9
10
0
Model
CC-IPB
Module Removal.
Removable modules contain static-sensitive
devices; handle modules at static-safe work
stations!
Situations Requiring Module Removal
Only jumper setting changes or module upgrades require modules to
be removed from the amplifier. Contact Crest Audio Customer
Service for full details on module removal. The ‘General Module
Setup’ diagram indicates the general setup of the rear panel
module/bay configuration.
Crest Audio CK Power Processing Amplifiers
Page 7
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Input Module Replacement Diagram - NC-IPN.
IMPORTANT:
Designed
&
manufactured in the USA by:
Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
THE POWER/OUTPUT
WIRING
USED
t
Model
Name
Output Power
@70.7V
Model
Name
Output Power
@8Ω/Ch.
CKS 100
CKS 200
CKS 400
CKS 800
CKS 800-2
CKS 1200-2
CKS 1600-2
50W
CKV 100
CKV 200
CKV 400
CKV 800
CKV 1600
CKV 2400
50W
100W
200W
400W
800W
1200W
MODULE IS NOT REMOVABLE. DO NOT
ATTEMPT TO REPLACE OR REMOVE A
POWER/OUTPUT MODULE !
100W
200W
400W
400W
600W
800W
Network
Address
Model
NC-NXS
Data
0
0
4
4
8
8
+
–
+
–
Hi
Lo
Ribbon Cable from
Network Module, if fitted
This module can only be serviced by a Crest Audio-certified
service technician. Please consult your dealer or Crest Audio
representative for assistance. User-inflicted damage to this
module will invalidate your warranty.
SEE INSTRUCTION MANUAL
5
5
Level
A
4
4
6
6
3
7
N-Coder
Data
Port
2
8
1
9
10
0
3
Level
B
Input
A
Input
B
7
2
1
8
–
+
–
+
9
0
10
Model
NC-IPN
Signal Ground Lift Jumper.
Whenever possible, the signal source equipment should share the
same AC ground as the amplifier(s). In some cases, however, partic-
ularly if an amplifier is being installed in an existing system, this
may result in a ground loop. If this happens, remove the factory-
installed ground lift jumper from the output barrier strip (located on
the Power/Output module), which electrically connects the signal
ground to the chassis/AC ground. If the jumper is removed, the sig-
nal ground is lifted and is clamped to ± 0.6V. Don’t remove the
jumper if the amplifier and the signal source equipment are not on
the same AC ground!
Replacing or Installing a Network Module.
The amplifier must be switched off and unplugged from the AC
mains supply before this operation is undertaken. Four Phillips head
screws secure the module to the chassis. The module is connected
electrically to the amplifier via multi-pin ribbon cables. Unplugging
the module from the ribbon cable connectors frees the module for
removal. To insert the same or another module, simply reverse this
procedure. Note: Standard CK Power Processing amplifiers come
with a blank panel installed in the Network bay. The amplifier must
not be operated without a Network module or blank panel in place.
In a properly designed system (for safety and to minimize noise), the
amplifier should receive its ground from the AC line cord. The shield
on a balanced input line should be grounded at one end only (usually
the sending end), and it must never be relied on to supply AC ground
to the amplifier.
Network Module Installation Diagram.
CLASS
2
WIRING
SEE INSTRUCTION M
MAY BE USED
Output
–
N-Coder
Data
Port
+8 to 18VDC
20 mA
A
Error
+8 to 18VDC
240 mA
+
+
B
–
AES/EBU
In
Inp
A
+
NEC
LASS
2
ONLY
Signal Ground
Lift Jumper
Signal
Ground
Lift
Jumper
+
Model
CC-STL
In
Out
Designed
&
manufactured in the USA by:
Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
+
Com
Model
Name
Output Power
@70.7V
Model
Name
Output Power
@8Ω/Ch.
CKS 100
CKS 200
50W
B
CKV 100
CKV 200
CKV 400
CKV 800
CKV 1600
CKV 2400
50W
100W
200W
400W
800W
1200W
100W
200W
400W
400W
600W
800W
CKS 400
NEC
CKS 800
CKS 800-2
CKS 1200-2
CKS 1600-2
CLASS 2 ONLY
Signal
Ground
Lift
0
0
4
4
6
6
8
8
+
–
+
–
Jumper
Model
CC-STL
Page 8
Crest Audio CK Power Processing Amplifiers
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TourClass® Protection Features.
Every model in the CK Power Processing incorporates TourClass
protection features. Derived from Crest’s extensive experience with
the world’s largest sound rental companies, the TourClass group of
circuits sets new standards in load and amplifier protection.
ACL (Active Clip Limiting).
At the amplifier’s full power, or clipping point, ACL will be activat-
ed. This is indicated by illumination of the Clip/ACL LED. The
channel gain will automatically be reduced, guarding the loudspeak-
ers against damaging high power and continuous square waves that
would otherwise be produced. Situations that may activate ACL
include: uncontrolled feedback, oscillations, or an improper equip-
ment setting or malfunctions upstream from the amplifier. Normal
program transients will not trigger ACL; only steady or excessive
clipping will. ACL is virtually transparent in operation and full sig-
nal bandwidth is maintained. If NexSys control is installed, ACL
operation is reported to NexSys.
IGM Impedance Sensing.
IGM (Instantaneous Gain Modulation) is an innovative circuit that
allows the amplifier to operate safely into any load. When the ampli-
fier sees a load that overstresses the output stage, the IGM circuit
adjusts the channel gain to a safe level. Like ACL, the IGM circuit is
inaudible in normal use. In addition, if extreme low impedance is
encountered, the amplifier’s output relay will open. If NexSys con-
trol is installed, IGM operation is reported to NexSys.
AutoRamp Protection.
AutoRamp operates every time the amplifier is turned on or is reacti-
vated after a protect condition. This exclusive Crest feature gradually
increases gain to the attenuator setting after the output relays close,
avoiding unnecessary stress on the loudspeakers.
Thermal Protection.
If the heatsink temperature reaches an abnormally high temperature,
the amplifier will protect itself by disconnecting speakers and shut-
ting down until sufficiently cooled. During this time, the Protect
LED will light. If the power transformer gets too hot, its thermal
sensing circuit will disconnect both channel outputs. During this
time, the Active LED will extinguish, the Protect LED will illumi-
nate, and ACL LEDs will stay off, and the cooling fan will stay run-
ning. Once cool enough, the amplifier will resume operation auto-
matically. If NexSys control is installed, thermal protect operation is
reported to NexSys.
Short Circuit.
If an output is shorted, the IGM and thermal circuits will automati-
cally protect the amplifier. The IGM circuit senses the short circuit
as an extremely stressful load condition and attenuates the signal,
protecting the channel’s output transistors from overcurrent stress. If
the short circuit remains, the load will be disconnected by the ther-
mal protection circuitry.
DC Voltage Protection.
If an amplifier channel detects DC voltage at its output terminals, the
output relay will immediately open to prevent loudspeaker damage.
The Protect LEDs will light. If NexSys control is installed, a DC pro-
tect condition is reported to NexSys.
Crest Audio CK Power Processing Amplifiers
Page 9
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Sequential Turn-On/Turn-Off.
CK Power Processing amplifiers come standard with the CC-STL Sequential Turn-On/Turn-Off (STO) Output/Power module installed. If the
amplifier front power switch is set to “remote” and a voltage of between +8 to +18 VDC is applied across the “Com” and “+8 to +18V” termi-
nals, a closure between the “In” and “Com” terminals will turn the amplifier on. Additional amplifiers are added to the chain by looping from
the "Out" terminal of one amplifier into the "In" terminal of the next amplifier.
Turn-on delay time between amplifiers fitted with basic modules (i.e., CC-STL) is approximately 100ms, turn-off delay time is 200ms. (When
using NexSys-controlled Power/Output modules, these standard turn-on and turn-off delay times may be modified in the software). The number
of CC-STL modules that an external DC supply will be able to power is dependent on the supply's voltage output and current capability. The
external Direct Plug-In Power Supply Unit (CC-WW1, available from Crest Audio) supplies 9 volts at 300 milliamps and can power 15 CC-
STL modules. If your configuration requires the STO control of more than 15 amplifiers, contact Crest Audio.
Standard Sequential Turn-On/Turn-Off Wiring.
For CK Power Processing amplifier systems configured
for basic non-NexSys applications, (CC-IPB with CC-
STL) an external Direct Plug-In Power Supply Unit is
needed to provide a nominal +8 to +18 Volts to each
STL module. Use only a two-wire power supply! This
power supply (part number CC-WW1) may be ordered
from Crest Audio . (Note that module CC-SDC has an
integral STO power supply, and does not require CC-
WW1). The “Com” and “+8 to+18V” terminals on each
CK Power Processing amplifier are bussed together in
parallel and connected to the DC supply. The “Out” ter-
minal of each CK amplifier is connected to the “In” ter-
minal of the next CK amplifier in the turn-on sequence.
The first amplifier in the chain requires an SPST closure
between it’s “In” terminal and “Com” terminal to initi-
ate the power turn-on sequence and keep the amplifiers
in the chain powered on.
Manual or NexSys-Compatible Sequential Turn-On/Turn-Off Wiring.
CK Power Processing amplifiers fitted with a NexSys-compatible NC
Power/Output Module (NC-STI, NC-SAC, NC-SLM) may be powered up via
NexSys OR with a manual switch closure. If NexSys is employed, the STO delay
time is also software-controllable. Note: when using NexSys control, hard-wiring
for manual switch closure between amplifiers should be used cautiously. If the
switch closure output is wired up, it WILL ¨cause the next amp to switch, regard-
less of which source (hardware switch or NexSys STO command) has initiated
the command.
The modules (and the non-NexSys compatible CC-SIO) feature a 6-pin connector
providing a 3-wire input from switch closures (or from a CK Power Processing
amplifier) and an opto-isolated 3-wire output to another CK Power Processing
amplifier. The 3-wire signals are: ON, OFF, and COM. To initiate either the ON
or OFF function manually, simply provide a closure from the proper signal line to
COM; after a time delay of approximately 200ms, the closure is echoed on the 3
isolated output signal pins to initiate the turn-on function in 'downstream' ampli-
fiers. The on/off closures can be either momentary or constant contact.
NexSys-Initiated Sequential Turn-
On/Off using NexSys-compatible
Power/ Output
Standard Sequential
Turn-On/Off
(max. # of amplifiers is
15 per CC-WW1)
Manually Initiated (hard-wired)
Sequential Turn-On/Off using
NexSys-compatible
CC-WW1
Direct Plug-In
Power Supply Unit
+8 (min) to +18VDC (max)
Modules
(unlimited #
of amplifiers)
Power/Output Modules
®
When employing NexSys-compatible
Power/Output modules, use either
NexSys-initiated Sequential Turn-
On/Off OR (three-wire) hard-wired
Sequential Turn-On/Turn-Off; NOT
BOTH!
+8 to 18VDC
20 mA
On
Off
PC
LISTED 8B42
COMMERCIAL
POWER
In
AMPLIFIER
120V~60 Hz 15A
Out
Com
Output
NEC
CLASS
2
ONLY
In
NC-NXS
On
Com
Off
On
Com
Off
Out
Output
+8 to 18VDC
20 mA
In
NC-NXS
LISTED 8B42
COMMERCIAL
POWER
On
In
AMPLIFIER
Com
Off
120V~60 Hz 15A
Out
Com
On
Com
Off
NEC
ONLY
CLASS
2
Out
Service Information. For service, contact your nearest Crest Audio Service Center, Distributor, Dealer, or any of the worldwide Crest Audio
offices, or contact Crest Audio Inc. Customer Service directly at: TEL. 201.909.8700 (USA) Fax. 201.909.8744 (USA).
For technical inquiries only, the Crest Audio Technical Services Dept. can be faxed at 201.587.0550 (USA). Crest Audio may also
Page 10
Crest Audio CK Power Processing Amplifiers
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Appendices
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Appendix A - CKS Series Specifications.
CKS100
CKS200
CKS400
CKS800
CKS800-2
CKS1200-2
CKS1600-2
8Ω Stereo Power, 20Hz-20kHz, 0.1% THD+N
8Ω Stereo Power, 1kHz, 0.01% THD+N
4Ω Stereo Power, 20Hz-20kHz, 0.1% THD+N
4Ω Stereo Power, 1kHz, 0.01% THD+N
2Ω Stereo Power, 20Hz-20kHz, 0.1% THD+N
2Ω Stereo Power, 1kHz, 0.1% THD+N
Max RMS Output Voltage (each channel)
Peak Output Voltage (each channel)
Frequency Response (+0 / -0.3dB, 1W/8Ω)
Power Bandwidth (rated power at 4Ω, 1% THD+N)
TourClass® Protection
50 Watts
60 Watts
75 Watts
90 Watts
N/A
100 Watts
120 Watts
150 Watts
175 Watts
N/A
200 Watts
255 Watts
300 Watts
320 Watts
N/A
400 Watts
440 Watts
600 Watts
670 Watts
N/A
400 Watts
420 Watts*
600 Watts
670 Watts*
800 Watts
870 Watts
64V
600 Watts
620 Watts*
900 Watts
940 Watts*
1100 Watts
1130 Watts
78V
700 Watts
715 Watts*
1100 Watts
1130 Watts*
1100 Watts
1440 Watts
90V
N/A
N/A
N/A
N/A
22V
32V
45V
64V
31V
45V
64V
90V
64V
110V
127V
10Hz–20kHz, -3dB @148kHz
10Hz–20kHz, +0/-0.2dB
ACL, IGM, AutoRamp, short circuit, DC voltage, turn-on/off transient, current inrush, and sub/ultrasonic input.
THD+N (rated power at 4Ω, 1kHz)
SMPTE IMD (rated power at 8Ω, 60Hz & 7kHz)
Damping Factor
<0.01%
300:1
0.5V
<0.01%
<0.01%
300:1
1.0V
<0.01%
<0.1%
400:1
>60dB
1.41V
<0.02%
<0.02%
<0.02%
300:1
400:1
400:1
400:1
Input CMRR (1kHz)
Input Sensitivity (rated power at 8Ω, @ X40 gain)
Voltage Gain
0.707V
1.41V
1.732V
1.87V
X40 standard, X20 & 0.775V user-selectable
>20kΩ, >10kΩ
Input Impedance (balanced, unbalanced)
Hum and Noise (below rated power @ 4Ω)
Crosstalk (below rated power @ 4Ω)
Class
105dB, A-weighted
>60dB @ 1kHz
AB
AB
AB
AB
H
H
H
Input Connectors (per channel)
Rear-panel barrier strip input, 4-pin Phoenix sequential turn-on/off connector on standard CC-STL module
Rear-panel barrier strip output
Output Connectors (per channel)
Filter Storage 10,000 µF
Power Supply (factory configured)
22,000 µF
16,400 µF
24,000 µF
24,000 µF
27,500 µF
37,000 µF
100–240V, 50–60Hz
Idle Current Draw (PowerSave active, 120V)
1/8 Power Current Draw (typical music, 120V/4Ω)
1/3 Power Current Draw (cont. music, 120V/4Ω)
Max Current Draw (circuit brkr rating, 120V/4Ω)
0.5A
1.65A
2.32A
3.5A
0.6A
3.0A
0.7A
5.8A
0.7A
10A
0.7A
4.2A
12.1A
20A
1.3A
9.6A
1.3A
10A
4.2A
8.6A
14.8A
15A
17.3A
22.6A
6.5A
12A
26A
30A
Thermal Emissions (1/8 Power, 4Ω) 612 BTU/hr
1100 BTU/hr
1380 BTU/hr
2120 BTU/hr
2820 BTU/hr
3584 BTU/hr
4700 BTU/hr
1210 BTU/hr
3600 BTU/hr
3164 BTU/hr
5040 BTU/hr
3154 BTU/hr
6525 BTU/hr
Thermal Emissions (1/3 Power, 4Ω) 780 BTU/hr
Cooling
Controls
Variable speed, front panel mounted fan, front-to-side airflow
Three-position front panel On/Remote/Off switch, two rear panel channel attenuators, AC mains circuit breaker
Signal, ACL (one per ch.) Protect, Active
LED Indicators (per channel)
Construction
Steel Chassis, 16 gauge, double thickness in rack ear area.
Dimensions (Height x Width x Depth) 3.5"x19.0"x17.13" 3.5"x19.0"x17.13"
89x483x435mm 89x483x435mm
3.5"x19.0"x17.13" 5.25"x19.0"x17.13" 5.25"x19.0"x17.13" 7.0"x19.0"x17.13"
89x483x435mm 133x483x435mm 133x483x435mm 178x483x435mm
7.0"x19.0"x17.13"
178x483x435mm
Gross Weight 31.63 lbs. (14.36 kg) 34.44 lbs. (15.64 kg) 35.44 lbs. (16.09 kg) 58.20 lbs. (26.42 kg) 58.20 lbs. (26.42 kg) 78.65 lbs. (35.39 kg) 78.65 lbs. (35.39 kg)
Net Weight 26.63 lbs. (12.09 kg) 29.44 lbs. (13.37 kg) 30.44 lbs. (13.82 kg) 50.20 lbs. (22.80 kg) 50.20 lbs. (22.80 kg) 70.65 lbs. (32.08 kg) 70.65 lbs. (32.08 kg)
Warranty
5 Years (USA, Canada, United Kingdom, and many other countries)
* 0.02% THD+N
Voltage Gain / Input Sensitivity Options
CKS100
CKS200
CKS400
CKS800
CKS800-2
CKS1200-2
CKS1200-2
Gain Sens
X40 0.5V
X20 1.0V
Gain Sens
X40 0.70V
X20 1.41V
X36.5 .775V
Gain Sens
X40 1.0V
X20 2.0V
X51.6 .775V
Gain Sens
X40 1.41V
X20 2.82V
X73 .775V
Gain Sens
X40 1.41V
X20 2.82V
X73 .775V
Gain Sens
X40 1.73V
X20 3.46V
X89.4 .775V
Gain Sens
X40 1.87V
X20 3.74V
X96.5 .775V
Factory Standard (“+32dB”)
Option 1 (“+26dB”)
Option 2 (“0dBu”)
X25.8 .775V
9/4/97
Power figures are watts per channel, both channels driven
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specification
©1997 Crest Audio Inc.
Appendix A
Crest Audio CK Power Processing Amplifiers
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Appendix B - CKV Series Specifications.
CKV100
CKV200
CKV400
CKV800
CKV1600
CKV2400
Output Power, 70.7 Volt
Max RMS Output Voltage (each channel)
Peak Output Voltage (each channel)
Frequency Response (+0 / -0.3dB, 1W/70.7V)
Power Bandwidth (full power, 1% THD+N)
TourClass® Protection
50 Watts
100 Watts
200 Watts
400 Watts
800 Watts
1200 Watts
92V
130V
10Hz –20kHz, -3dB @ 148kHz
10Hz –20kHz, +0/-0.2dB
ACL, IGM, AutoRamp, short circuit, DC voltage, turn-on/off transient, current inrush, and sub/ultrasonic input.
THD+N (rated power, 1kHz)
<0.1%
<0.1%
SMPTE IMD (rated power, 60Hz & 7kHz)
Input CMRR (1kHz)
> 60 dB
Input Sensitivity (rated power)
Voltage Gain
1.75V @ X40 gain setting
X40 standard, X20 & 0.775V user-selectable
>20kΩ/>10kΩ
Input Impedance (balanced, unbalanced)
Hum and Noise (below rated power)
Crosstalk (below rated power)
Class
105dB, A-weighted
>60dB @ 1kHz
AB
AB
AB
AB
H
H
Input Connectors (per channel)
Output Connectors (per channel)
Filter Storage
Rear panel barrier strip input, 4-pin Phoenix sequential turn-on/off connector on standard CC-STL module
Rear panel barrier strip output
3,900 µF
3,900 µF
7,800 µF
11,200 µF
37,000 µF
37,000 µF
Power Supply (factory configured)
Idle Current Draw (PowerSave active, 120V)
1/8 Power Current Draw (typical music, 120V)
1/3 Power Current Draw (cont. music, 120V)
Max Current Draw (breaker rating, 120V)
Thermal Emissions (1/8 Power, 120V)
Thermal Emissions (1/3 Power, 120V)
Cooling
100V–240V, 50–60Hz
0.5A
0.76A
0.5A
2.2A
0.6A
3.6A
0.8A
7.0A
1.3A
8.0A
1.3A
10A
1.02A
2.83A
5.1A
10.1A
17.0A
23.0A
2.5A
4.2A
7.0A
15A
30A
30A
269 BTU/hr
304 BTU/hr
816 BTU/hr
932 BTU/hr
1304 BTU/hr
1634 BTU/hr
2540 BTU/hr
3263 BTU/hr
2600 BTU/hr
5000 BTU/hr
3100 BTU/hr
6500 BTU/hr
Variable speed, front panel mounted fan, front-to-side cooling
Controls
Three-position front panel On/Remote/Off switch, two rear panel channel attenuators, AC mains circuit breaker
Signal, ACL (one per ch.) Protect, Active
LED Indicators (per channel)
Construction
Steel Chassis, 16 gauge, double thickness in rack ear area.
Dimensions (Height x Width x Depth)
3.5"x19.0"x17.13"
89x483x435mm
3.5"x19.0"x17.13"
89x483x435mm
3.5"x19.0"x17.13"
89x483x435mm
5.25"x19.0"x17.13"
133x483x435mm
7.0"x19.0"x17.13"
178x483x435mm
7.0"x19.0"x17.13"
178x483x435mm
Net Weight 30.26 lbs. (13.74 kg)
Gross Weight 25.26 lbs. (11.47 kg)
Warranty
32.20 lbs. (14.62 kg)
27.20 lbs. (12.35 kg)
35.66 lbs. (16.19 kg)
30.66 lbs. (13.92 kg)
58.20 lbs. (26.42 kg)
50.20 lbs. (22.80 kg)
78.65 lbs. (35.39 kg)
70.65 lbs. (32.08 kg)
78.65 lbs. (35.39 kg)
70.65 lbs. (32.08 kg)
5 Years (USA, Canada, United Kingdom, and many other countries)
Voltage Gain / Input Sensitivity Options
CKV100
CKV200
CKV400
CKV800
CKS1600-2
CKS2400-2
Gain Sens
X40 1.77V
X20 3.54V
X91 .775V
Gain Sens
X40 1.77V
X20 3.54V
X91 .775V
Gain Sens
X40 1.77V
X20 3.54V
X91 .775V
Gain Sens
X40 1.77V
X20 3.54V
X91 .775V
Gain Sens
X40 1.77V
X20 3.54V
X91 .775V
Gain Sens
X40 1.77V
X20 3.54V
X91 .775V
Factory Standard (“+32dB”)
Option 1 (“+26dB”)
Option 2 (“0dBu”)
9/4/97
Power figures are watts per channel, both channels driven
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specification
©1997 Crest Audio Inc.
Crest Audio CK Power Processing Amplifiers
Appendix B
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Appendix C - CKX Series Specifications.
CKX150
CKX300
CKX500
CKX800
Output Power, 100 volt (50 or 70.7 volt option)
40Hz–20kHz, 0.1% THD+N
Max RMS Output Voltage (each channel)
Peak Output Voltage (each channel)
Frequency Response (1W/100V)
Power Bandwidth (rated power, 1% THD+N)
TourClass® Protection
75 Watts
150 Watts
250 Watts
400 Watts
105V
150V
38Hz–38kHz, +0/-3dB
40Hz–16kHz, +0/-1dB
ACL, IGM, AutoRamp, short circuit, DC voltage, turn-on/off transient, current inrush, and sub/ultrasonic input.
THD+N (rated power, 1kHz)
<0.1%
<0.1%
>60dB
SMPTE IMD (rated power, 60Hz & 7kHz)
Input CMRR (1kHz)
Input Sensitivity (rated power)
Voltage Gain
.61V @ X40 gain setting
.87V @ X40 gain setting
1.1V @ X40 gain setting
1.41V @ X40 gain setting
X40 standard, X20 & 0.775V user-selectable
Input Impedance (balanced, unbalanced)
Hum and Noise (below rated power)
Crosstalk (below rated power)
Class
>20kΩ, >10kΩ
105dB, A-weighted
>60dB @ 1kHz
AB
AB
AB
AB
Input Connectors (per channel)
Output Connectors (per channel)
Filter Storage
Rear-panel barrier strip input, 4-pin Phoenix sequential turn-on/off connector on standard CC-STL module
Touch-proof rear-panel barrier strip output
20,000 µF
20,000 µF
34,000 µF
32,000 µF
Power Supply (factory configured)
Idle Current Draw (PowerSave active, 240V)
1/8 Power Current Draw (typical music, 240V)
1/3 Power Current Draw (cont. music, 240V)
Max Current Draw (breaker rating, 240V)
Thermal Emissions (1/8 Power, 240V)
Thermal Emissions (1/3 Power, 240V)
Cooling
100–240V, 50–60Hz
0.5A
0.57A
0.25A
1.6A
0.3A
2.2A
0.4A
3.5A
.77A
2.1A
3.2A
5.2A
1.88A
3.2A
4.4A
7.5A
404BTU/hr
456BTU/hr
1220BTU/hr
1400BTU/hr
1630BTU/hr
2450BTU/hr
2540BTU/hr
3263BTU/hr
Variable speed, front panel mounted fan, front-to-side cooling
Three-position front panel On/Remote/Off switch, two rear panel channel attenuators, AC mains circuit breaker
Signal, ACL (one per ch.) Protect, Active
Controls
LED Indicators (per channel)
Construction
Steel Chassis, 16 gauge, double thickness in rack ear area.
Dimensions (Height x Width x Depth)
5.25"x19.0"x17.13"
133x483x435mm
37 lbs. (16.82 kg)
32 lbs. (14.55 kg)
5.25"x19.0"x17.13"
133x483x435mm
40.0 lbs. (18.18 kg)
35.0 lbs. (15.91 kg)
5.25"x19.0"x17.13"
133x483x435mm
40.0 lbs. (18.18 kg)
35.0 lbs. (15.91 kg)
5.25"x19.0"x17.13"
133x483x435mm
Gross Weight
Net Weight
65.0 lbs. (29.55 kg)
57.0 lbs. (25.91 kg)
CKX150
CKX300
CKX500
CKX800
Gain Sens
X40 .61V
X20 1.22V
X31.5 .775V
Gain Sens
X40 .87V
X20 1.74V
X44.9 .775V
Gain Sens
X40 1.1V
X20 2.2V
X56.8 .775V
Gain
X40
X20
Sens
Factory Standard (“+32dB”)
Option 1 (“+26dB”)
1.41V
2.82V
.775V
9/4/97
Option 2 (“0dBu”)
X73.0
Power figures are watts per channel, both channels driven
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specification
©1997 Crest Audio Inc.
Appendix C
Crest Audio CK Power Processing Amplifiers
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Appendix D - Wire Gauge Charts
Stranded Cable Lgth.
(ft.)
Wire Gauge (AWG)
Power Loss
(8 ohm load)
Power Loss
(4 ohm load)
Power Loss
(2 ohm load)
5
18
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
10
40
18
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
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
22%
14.6
9.6
6.2
4.0
1.20
2.4
18
16
14
12
10
8
11.9%
7.7
5.0
3.2
2.0
22%
14.6
9.6
6.2
4.0
37%
26
17.8
11.8
7.7
80
1.20
2.4
4.7
Wire Gauge (mm2)
Stranded Cable Lgth.
(m)
Power Loss
(8 ohm load)
Power Loss
(4 ohm load)
Power Loss
(2 ohm load)
2
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
0.3
0.5
0.75
1.5
2.5
4
5
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
0.5
0.75
1.5
2.5
4
1.45
6
10
8.24%
5.6
2.9
1.74
1.09
0.73
15.5%
10.8
5.6
2.9
1.74
1.09
28%
19.9
10.8
6.7
4.3
2.9
0.5
0.75
1.5
2.5
4
6
Crest Audio CK Power Processing Amplifiers
Appendix D
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Appendix E - Distributed / Constant Voltage Systems.
A distributed or constant voltage system, as shown in the figure below, uses
Z = 5000/ P
For example, if the total power demanded by the speakers is 200 watts, then:
V2/P = 25
loudspeaker step-down transformers for each speaker. The transformers are
designed to deliver a specific power level into a specific load impedance
when a specific voltage (the example here uses 70.7 volts) appears at the pri-
mary. A speaker transformer usually has taps on its primary, secondary, or
both, so it can be used for several different power levels or speaker imped-
ances.
The compensation factor for transformer insertion loss is:
x = power drawn from distributed line
power delivered to speaker = 10 Insertion loss (in dB)/ 10
Each speaker step-down transformer converts the low impedance of its loud-
speaker to a relatively high impedance as seen by the distributed line.
Consequently, loads can be added or subtracted to the distributed line with
very little effect on the actual line voltage, hence the term “constant voltage.”
Therefore, a speaker transformer with an insertion loss of 1 dB, tapped at 4
watts, will actually demand 1.26 times 4 watts, or about 5 watts.
CKV Series amplifiers are specifically designed for use with distributed or
constant voltage systems. Each CKV Series model can drive two distributed
lines (one per channel) of the type for which they are configured, any number
of tapped loudspeakers can be placed on a line as long as the total demanded
power including insertion losses does not exceed the rated power of the
model chosen.
The actual line load Z that the amplifier “sees” is determined by the formula
Z = V2/P
where P is the sum of the loudspeaker power taps, compensated for trans-
former insertion loss;
If the impedance of a distributed line overly stresses the amplifier output
stage, the amplifier’s IGM protection circuits engage, reducing gain in order
to protect the amplifier.
(P = X [xfrmr#1] P [speaker#1] + X [xfrmr#2] P [speaker#2] + ...),
*
*
and V is the distributed line voltage. So, for a 70.7 volt line,
Z = (70.7)2 / P
Appendix E
Crest Audio CK Power Processing Amplifiers
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Crest Audio CK Power Processing Amplifiers
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Crest Audio Inc.
100 Eisenhower Dr., Paramus NJ 07652 USA
TEL: 201.909.8700 FAX: 201.909.8744
Printed in USA
v. 1.9 11/26/97 © 1997 Crest Audio, Inc.
Power is serious business.
*C1000020*
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