Crest Audio CKS800-2 User manual

CKS800-2 POWER
PROCESSING AMPLIFIER
Power Specifications 8ΩStereo 4ΩStereo 2ΩStereo
20Hz - 20kHz, 0.1% THD+N 400W 600W 800W
1kHz, 0.02% THD+N 420W 670W 870W
• Sequential Turn-On/Off (STO). Standard system uses any +8 to
+18VDC source and contact closure.
• PowerSave. Reduces power consumption at idle by turning off the
bias circuit (and fan if heat sink temperature is below allowed thresh-
old) when no signal present at input.
• 3 Module Bays. Unique chassis construction provides three separate
bays into which a diverse range of space-saving and cost effective
Input Processing, Network and Power/Output modules can be fitted.
By combining multiple processing and control functions in the ampli-
fier, CKS Series Power Processing amplifiers significantly save on
installation costs versus conventional outboard processing.
• Cool Operation. High thermal mass heat sinks, with high-efficiency
variable speed fan. Front panel mounted filter for easy maintenance.
• “Overbuilt” Power Supply. In the Crest tradition, the power supply
is “over-engineered” for ample current reserves to meet demanding
load conditions.
• More Transistors. More output devices than comparably-powered
competitive models to provide wider safe operating area and lower
heat generation.
Product Description
The Crest Audio CKS800-2 Power Processing amplifier is designed specifically for the unique requirements of high-quality commercial and indus-
trial sound installations. Design goals met by the CKS800-2 include exceptional sonic accuracy, high efficiency, minimum power consumption,
comprehensive loudspeaker protection, and the ability to handle extended duty cycles.
In addition, the CKS800-2 incorporates Crest Audio’s proprietary modular approach to input/output and external control configuration. We call this
concept Power Processing. Through the provision of three plug-in module bays, these amplifiers offer exceptional flexibility with integral signal pro-
cessing, load monitoring, and either local or system-wide computer control via Crest Audio’s NexSys®network.
The CKS800-2 amplifier is manufactured exclusively in Crest Audio’s own USA plant, using only the highest quality components.
Key sub-assemblies are individually pre-tested, and all units are rigorously “burned-in” before final checkout on precision test equipment.
• TourClass®Protection Circuits:
ACL (Active Clip Limiting) prevents speaker damage with gentle
gain reduction at clip threshold.
IGM (Instantaneous Gain Modulation) monitors connected loads to
detect conditions that may overstress output devices, allowing safe
operation into difficult loads.
AutoRamp gradually increases gain to attenuator setting level when
amplifier is turned on.
TourClass also includes comprehensive thermal management, and
short circuit, DC voltage, turn-on/off transient, current inrush and
sub/ultrasonic input protection.
• Selectable input sensitivity/voltage gain (internal jumpers)
• UL certification
• Front panel status indication
• Rear panel attenuators with removable knobs
• Barrier strip input and output connectors
• Optional input isolation transformers
• Front panel label area
• Full five-year warranty*
CKS800-2 Features
Figures are watts per channel, both channels driven. NexSys is a registered trademark of Crest Audio Inc.

Com
Out
In
+8 to 18VDC
20 mA
Model
CC-STL
NEC
CLASS 2 ONLY
CLASS 2 WIRING
MAY BE USED
Output
A
B
+
+
–
–Signal
Ground
Lift
Jumper
Model
CC-BLK
Designed & manufactured in the USA by:
Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
Model
Name
CKS 100
CKS 200
CKS 400
CKS 800
CKS 800-2
CKS 1200-2
CKS 1600-2
Output Power
@8Ω/Ch.
50W
100W
200W
400W
400W
600W
800W
Model
Name
CKV 100
CKV 200
CKV 400
CKV 800
CKV 1600
CKV 2400
Output Power
@70.7V
50W
100W
200W
400W
800W
1200W
Level
B
Level
A
++–
–
SEE INSTRUCTION MANUAL
78
9
5
2
0
1
346
10
78
9
5
2
0
1
346
10
Model
CC-IPB
Input A Input B
LISTED 8B42
COMMERCIAL
POWER
AMPLIFIER
120V~60 Hz 15A
CKS800-2 POWER PROCESSING AMPLIFIER
SPECIFICATIONS Architect’s & Engineer’s Specifications
The power amplifier shall consist of 2 channels and deliver a
minimum of 400 watts at 8 ohms, 600 watts at 4 ohms, and
800 watts at 2 ohms; per channel, both channels driven,
20Hz-20kHz, 0.1% THD+N.
A variable speed fan, with the ability to completely turn off
under appropriate ambient temperature conditions, shall pro-
vide air flow through the chassis from front to both sides.
The amplifier shall have circuitry to protect itself and the
speaker load from output short circuits, DC voltage on out-
puts, and thermal overload. The amplifier shall include cir-
cuitry to gradually increase gain to attenuator setting levels
when amplifier is turned on, and circuitry for impedance
sensing and active clip limiting.
The amplifier shall include an energy saving feature which
shall automatically remove the output stage bias current when
the amplifier is in an idle condition.
The amplifier shall have a voltage gain of X40, or a voltage
gain of X20, or an input sensitivity of 0.775V, for rated power
at 4 ohms, internally jumper-selectable. The hum and noise
level shall be greater than 105dB below rated output, “A”
weighted. The amplifier shall have a class H output stage
(with a modulated power supply). The frequency response
shall be greater than 20Hz-20kHz, +0, -0.3dB at rated power.
The amplifier shall operate at either 100, 120, 220, 230, or
240 volts, 50-60 Hz AC (configured at factory). Maximum
current draw at 120V shall be no greater than 20A, both
channels driven continuously into 4 ohm resistive loads.
Front panel LED indicators shall include Active, Protect,
Signal Present, and ACL (Clip Limiting) LEDs for each chan-
nel. The power switch shall have three positions; one to per-
mit power up from a remote location, one to permit local
power up, and an ‘off’ position. The fan filter shall be front
panel mounted, with no tools required for removal.
The rear panel shall be configured with three openings or
bays which will accept plug-in modules used to accomplish
input signal processing, network control, remote sequential
turn-on/off and other related functions. The output module
shall be fitted with the following connectors: 5mm, 4-pin
Phoenix for sequential turn-on/off wiring, and an output bar-
rier strip with 0.438" (11mm) screw spacing, and 0.320"
(8mm) lug space. The input module shall be fitted with an
input barrier strip connector with 0.320" (8mm) screw spac-
ing, and 0.270" (7mm) lug space, and two individual channel
attenuators with removable knobs.
A user re-settable AC mains circuit breaker and a single
molded AC cord (suitable for a normal household AC outlet)
shall be mounted on the rear chassis.
The packaging of the amplifier shall allow for standard rack
mounting without requiring space between similar units.
Dimensions shall be 19" (483mm) wide, 5.25" (133mm) high
and 17.13" (435mm) deep. It shall weigh 70.65 lbs. (32.08 kg)
net. The amplifier shall be designated the Crest Audio model
CKS800-2.
Crest Audio Inc.
100 Eisenhower Dr., Paramus NJ 07652 USA
TEL: [phone] FAX: [phone]
http://www.crestaudio.com
Printed in USA
v. 2.1 11/20/96 A3300005
*USA, Canada, United Kingdom, and
many other countries.
Power figures are watts per channel, both
channels driven. Crest Audio reserves the
right to make improvements in manufac-
turing or design which may affect specifi-
cation. Crest Audio specification literature
is available in electronic form to qualified
users. Contact Crest Audio Inc. for more
information. ©1996 Crest Audio Inc.
Rear View
8 Ohm Stereo Power
4 Ohm Stereo Power
2 Ohm Stereo Power
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
THD+N (rated power at 4Ω, 1kHz)
SMPTE IMD (rated power at 8Ω, 60Hz & 7kHz)
Damping Factor
Input CMRR (1kHz)
Input Sensitivity (rated power at 8Ω)
Standard Voltage Gain
Input Impedance (balanced/unbalanced)
Hum and Noise (“A” weighted, full power, 4Ω)
Crosstalk (“A” weighted, full power, 4Ω)
Class
Input Connectors (per channel)
Output Connectors (per channel)
Filter Storage
Power Supply (factory configured)
Idle Current Draw 120V
1/8 Power Curr. Draw (typical music, 120V/4Ω)
1/3 Power Curr. Draw (cont. music, 120V/4Ω)
Max Curr. Draw (circuit breaker rating, 120V/4Ω)
Thermal Emissions (1/8 Power, 4Ω)
Thermal Emissions (1/3 Power, 4Ω)
Cooling
Controls
LED Indicators (per channel)
Construction
Dimensions (Height x Width x Depth)
Gross Weight, Net Weight
Warranty
1kHz, 0.01% THD+N 20Hz-20kHz, 0.1% THD+N
420W 400W
670W 600W
870W 800W
64V
90V
10Hz-20kHz, -3dB @148kHz
10Hz - 20kHz, +0/-0.2 dB
ACL, IGM, AutoRamp, short circuit, DC voltage, turn-
on/off transient, current inrush, sub/ultrasonic input.
<0.02%
<0.1%
400:1
>60 dB
1.41V
X40 (jumper-selectable for X20 or .775V sens.)
>20kΩ/>10kΩ
-105 dB
>-60dB
H
Rear-panel barrier strip input, 4-pin Phoenix sequential
turn-on/off connector on standard CC-STL module
Rear-panel barrier strip output
12,000 µF
100V-240V, 50-60Hz
.7A (PowerSave active)
4.2A
12.1A
20A
1210 BTU/hr
3600 BTU/hr
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
Steel chassis, 16 gauge.
Double thickness in rack ear areas.
5.25" x 19" x 17.13" / 133 x 483 x 435mm
78.65 lbs. (35.39 kg), 70.65 lbs. (32.08 kg)
5 years*
*A3300005*