Crown Audio CTs 4200, CTs 8200 User Manual
Operation Manual
CTs Multi-Channel Series
CTs 4200
CTs 8200
Obtaining Other Language Versions:
local Crown Distributor. If you need assistance locating your local distributor, please contact Crown at 574-294-8000.
This manual does not include all of the details of design, production, or variations of the equipment. Nor does it cover every possible
situation which may arise during installation, operation or maintenance.
The information provided in this manual was deemed accurate as of the publication date. However, updates to this information may have
occurred. To obtain the latest version of this manual, please visit the Crown website at www.crownaudio.com.
Trademark Notice:
national. Other trademarks are the property of their respective owners.
©2005 by Crown Audio® Inc., 1718 W. Mishawaka Rd., Elkhart, Indiana 46517-9439 U.S.A. Telephone: 574-294-8000
Crown, Crown Audio, Amcron, Com-Tech, IQ System, and Multi-Mode are registered trademarks of Crown Inter-
To obtain information in another language about the use of this product, please contact your
Some models may be exported under the name Amcron.
®
134434-7A
3/05
Important Safety
Instructions
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 ventilation openings. Install
in accordance with the 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 prong. The wide blade or the
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, particularly at plugs, convenience
receptacles, and the point where they exit from
the apparatus.
11) Only use attachments/accessories specified
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) Refer all servicing to qualified service personnel. Servicing is required when the apparatus
has been damaged in any way, such as powersupply 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.
15) WARNING: TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT EXPOSE
THIS APPARATUS TO RAIN OR MOISTURE.
16) DO NOT EXPOSE TO DRIPPING OR SPLASHING. DO NOT PLACE OBJECTS FILLED WITH
LIQUID, SUCH AS VASES,ON THIS APPARATUS.
TO PREVENT ELECTRIC SHOCK DO NOT REMOVE
TOP OR BOTTOM COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO
QUALIFIED SERVICE PERSONNEL.
À PRÉVENIR LE CHOC ÉLECTRIQUE N’ENLEVEZ
PAS LES COUVERCLES. IL N’Y A PAS DES PARTIES SERVICEABLE À L’INTÉRIEUR. TOUS REPARATIONS DOIT ETRE FAIRE PAR PERSONNEL
QUALIFIÉ SEULMENT.
TO COMPLETELY DISCONNECT THIS EQUIPMENT
FROM THE AC MAINS, DISCONNECT THE POWER
SUPPLY CORD PLUG FROM THE AC RECEPTACLE. THE MAINS PLUG OF THE POWER SUPPLY
CORD SHALL REMAIN READILY OPERABLE.
IMPORTANT
CTs Series amplifiers require Class 2 output
wiring.
MAGNETIC FIELD
CAUTION! Do not locate sensitive high-gain equipment such as preamplifiers or tape decks directly
above or below the unit. Because this amplifier has
a high power density, it has a strong magnetic field
which can induce hum into unshielded devices that
are located nearby. The field is strongest just above
and below the unit.
If an equipment rack is used, we recommend locating the amplifier(s) in the bottom of the rack and the
preamplifier or other sensitive equipment at the top.
CTs Multi-Channel Power Amplifiers
WATCH FOR THESE SYMBOLS:
The lightning bolt triangle is used to alert the user to
the risk of electric shock.
The exclamation point triangle is used to alert the
user to important operating or maintenance instructions.
FCC COMPLIANCE NOTICE
This device complies with part 15 of the FCC rules. Operation is subject to the following
two conditions: (1) This device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired
operation.
CAUTION: Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
NOTE: 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 energy and, if not installed
and used in accordance with the instruction manual, 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 try 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 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 technician for help.
page 2
Operation Manual
CTs Multi-Channel Power Amplifiers
Crown International, Inc.
ISSUED BY: Crown International, Inc.
1718 W. Mishawaka Road
Elkhart, Indiana 46517 U.S.A.
European Representative's Name and Address:
Nick Owen
35, Bassets Field
Thornhill
Cardiff. South Glamorgen
CF14 9UG United Kingdom
Equipment Type: Commercial Audio Power Amplifiers
Family Name: CTs
Model Names: CTs 4200A, CTs 8200A
EMC Standards:
EN 55103-1:1995 Electromagnetic Compatibility - Product Family Standard for Audio, Video, Audio-Visual and Entertainment Lighting Control Apparatus for Professional Use, Part 1: Emissions
EN 55103-1:1995 Magnetic Field Emissions-Annex A @ 10 cm and 1 M
EN 61000-3-2:1995+A14:2000 Limits for Harmonic Current Emissions (equipment input current ≤16A per phase)
EN 61000-3-3:1995 Limitation of Voltage Fluctuations and Flicker in Low-Voltage Supply Systems Rated Current ≤16A
EN 55022:1992 + A1: 1995 & A2:1997 Limits and Methods of Measurement of Radio Disturbance Characteristics of ITE: Radiated, Class B Limits; Conducted, Class B
EN 55103-2:1996 Electromagnetic Compatibility - Product Family Standard for Audio, Video, Audio-Visual and Entertainment Lighting Control Apparatus for Professional Use, Part 2: Immunity
EN 61000-4-2:1995 Electrostatic Discharge Immunity (Environment E2-Criteria B, 4k V Contact, 8k V Air Discharge)
EN 61000-4-3:1996 Radiated, Radio-Frequency, Electromagnetic Immunity (Environment E2, criteria A)
EN 61000-4-4:1995 Electrical Fast Transient/Burst Immunity (Criteria B)
EN 61000-4-5:1995 Surge Immunity (Criteria B)
EN 61000-4-6:1996 Immunity to Conducted Disturbances Induced by Radio-Frequency Fields (Criteria A)
EN 61000-4-11:1994 Voltage Dips, Short Interruptions and Voltage Variation
Safety Standard:
EN 60065: 1998 Safety Requirements - Audio Video and Similar Electronic Apparatus
I certify that the product identified above conforms to the requirements of the EMC Council Directive 89/336/EEC as amended by 92/31/EEC, and the Low Voltage Directive 73/23/EES as amended by 93/68/EEC.
Signed
Larry Coburn
Title: Senior Vice President of Manufacturing
DECLARATION of CONFORMITY
FOR COMPLIANCE QUESTIONS ONLY:
Date of Issue: March 1, 2002
Sue Whitfield
574-294-8289
swhitfield@crownintl.com
Operation Manual
Due to line current harmonics, we recommend that you contact your supply authority before connection.
page 3
CTs Multi-Channel Power Amplifiers
Important Safety Instructions .......................................................2
Declaration of Conformity ............................................................3
1 Welcome ..................................................... 5
1.1 Features ...........................................................................5
2 How to Use This Manual .................................. 5
3 Setup ......................................................... 6
3.1 Unpack Your Amplifier .....................................................6
3.2 Install Your Amplifier .......................................................6
3.3 Ensure Proper Cooling ....................................................6
3.4 Choose Input Wire and Connectors .................................7
3.5 Choose Output Wire and Connectors ...............................7
3.6 Wire Your System ............................................................8
3.6.1 Dual 8/4 Mode ........................................................8
3.6.2 Dual 70V Mode .......................................................8
3.6.3 Bridge-Mono 16/8 Mode ........................................9
3.6.4 Bridge-Mono 100V Mode .......................................9
3.7 Connect to AC Mains .......................................................10
3.8 Startup Procedure ............................................................10
4 Operation .................................................... 11
4.1 Precautions ......................................................................11
4.2 Front Panel Controls and Indicators .................................12
4.3 Back Panel Controls and Connectors ...............................13
5 Advanced Features and Options .......................... 14
5.1 Protection Systems ..........................................................14
5.1.1 Thermal Level Control (TLC) ..................................14
5.1.2 Fault .......................................................................14
5.1.3 Fault Isolation Topology (FIT) .................................14
5.1.4 35-Hz High-Pass Filter ...........................................14
5.1.5 AC Under-/Over-Voltage Protection .......................14
5.1.6 Power Fuse .............................................................14
5.1.7 Inrush Limiting .......................................................14
5.1.8 Variable-speed Fans ...............................................14
5.2 Advanced Features ..........................................................14
5.2.1Switching Power Supply ..........................................14
5.2.2 Mode Switch ..........................................................14
5.2.3 Bridge Mode Indicator ............................................14
5.2.4 Channel Level Control ............................................15
5.3 Options ............................................................................16
5.3.1 Control Modules ....................................................16
5.3.2 Input Sensitivity ......................................................16
6 Troubleshooting ............................................ 17
7 Specifications .............................................. 19
8 AC Power Draw and Thermal Dissipation .............. 23
9 Service ...................................................... 25
9.1. International and Canada Service ...................................25
9.2 US Service .......................................................................25
9.2.1 Service at a US Service Center ...............................25
9.2.2 Factory Service .......................................................25
9.2.3 Factory Service Shipping Instructions.....................25
9.2.4 Packing Instructions................................................25
9.2.5 Estimate Approval....................................................25
9.2.6 Payment of Non-Warranty Repairs...........................25
10 Warranty ................................................... 26
Crown Factory Service Information Form ....................................29
page 4
Operation Manual
CTs Multi-Channel Power Amplifiers
CTs 4200
Dual
4 Channels Driven
4-ohm (per ch.)
8-ohm (per ch.)
70V (per ch.)
4-ohm (per ch.)
8-ohm (per ch.)
70V (per ch.)
Maximum Average Power
in watts with 0.1% THD.
1 kHz
20 Hz–20 kHz
260W
180W
220W
270W
220W
250W
215W
190W
220W
1 kHz 20 Hz–20 kHz1 Channel Driven
225W
210W
245W
Bridge-Mono
2 Channel-Pairs Driven
8-ohm (per ch. pair)
16-ohm (per ch. pair)
100V (per ch. pair)
8-ohm (per ch. pair)
16-ohm (per ch. pair)
100V (per ch. pair)
*
Constant Voltage full bandwidth power ratings support
100Hz - 20kHz due to automatic High-Pass Filters.
CTs 8200
Dual
8 Channels Driven
4-ohm (per ch.)
8-ohm (per ch.)
70V (per ch.)
4-ohm (per ch.)
8-ohm (per ch.)
70V (per ch.)
1 kHz 20 Hz–20 kHz
520W
400W
220W
560W
440W
250W
Maximum Average Power
in watts with 0.1% THD.
200W
160W
200W
270W
220W
250W
1 kHz 20 Hz–20 kHz1 Channel-Pair Driven
1 kHz
1 kHz 20 Hz–20 kHz1 Channel Driven
430W
380W
220W
450W
420W
245W
20 Hz–20 kHz
175W
155W
185W
230W
220W
230W
Bridge-Mono
4 Channel-Pairs Driven
8-ohm (per ch. pair)
16-ohm (per ch. pair)
100V (per ch. pair)
8-ohm (per ch. pair)
16-ohm (per ch. pair)
100V (per ch. pair)
*
Constant Voltage full bandwidth power ratings support
100Hz - 20kHz due to automatic High-Pass Filters.
1 kHz 20 Hz–20 kHz
400W
320W
200W
540W
440W
250W
350W
310W
185W
1 kHz 20 Hz–20 kHz1 Channel-Pair Driven
460W
440W
230W
*
*
*
1 Welcome
*
*
*
*
*
Building on the foundation of the Com-Tech®
Series, Crown’s CTs Series offers new flexibility
and value for installed sound applications. The
Com-Tech Series were the first to offer independent selection of high- and low-impedance
operation for a specific channel, and CTs Series
amplifiers continue that tradition, with power
levels and features carefully chosen to perfectly
integrate into fixed install design requirements.
Modern power amplifiers are sophisticated
pieces of engineering capable of producing
extremely high power levels. They must be
treated with respect and correctly installed if
they are to provide the many years of reliable
service for which they were designed.
In addition, CTs Series amplifiers include a
number of features which require some explanation before they can be used to their maximum advantage.
Please take the time to study this manual so
that you can obtain the best possible service
from your amplifier.
1.1 Features
•New Crown
®
Switching Power Supply for
reduced weight.
• High power-density, with eight channels in
a 3U chassis and four channels in a 2U
• Selectable constant-voltage (70V/100V) or
low-impedance (8/4 ohm) operation for
each channel pair.
• FIT (Fault Isolation Topology) circuitry
isolates faults within affected channels.
• 35 Hz High-Pass Filter (70 Hz in CTs
4200) is automatically inserted when the
channel pair is set for constant-voltage
operation. (corner frequency may be
changed as a service option).
• Accepts new MC accessory modules that
tailor the amplifier to suit specific applications. Modules available for remote VCA
level control and IQ System
®
Control.
• Comprehensive array of indicators including Power and Data, along with Bridge,
Ready, Signal, Clip, Thermal and Fault for
each channel, provide accurate diagnostics.
• Blue Power Indicator flashes if the amplifier shuts off due to an under-/over-voltage
condition on the AC mains.
• Advanced protection circuitry guards
against: shorted outputs, open circuits,
DC, mismatched loads, general overheating, under-/over-voltage, high-frequency
overloads and internal faults.
®
• Proven Crown AB+B Multi-Mode
output
topology.
• Continuously-variable-speed fans optimize cooling efficiency.
• Three Year, No-Fault, Fully-Transferable
Warranty completely protects your investment and guarantees its specifications.
2 How to Use This
Manual
This manual provides you with the necessary
information to safely and correctly setup and
operate your amplifier. It does not cover every
aspect of installation, setup or operation that
might occur under every condition. For additional information, please consult Crown’s
Amplifier Application Guide (available online at
www.crownaudio.com), Crown Tech Support,
your system installer or retailer.
We strongly recommend you read all instructions, warnings and cautions contained in this
manual. Also, for your protection, please send
in your warranty registration card today, or register online at www.crownaudio.com. And save
your bill of sale—it’s your official proof of purchase.
chassis.
Operation Manual
page 5
3 Setup
CTs Multi-Channel Power Amplifiers
3.1 Unpack Your Amplifier
Please unpack and inspect your amplifier for
any damage that may have occurred during
transit. If damage is found, notify the transportation company immediately. Only you can initiate a claim for shipping damage. Crown will
be happy to help as needed. Save the shipping
carton as evidence of damage for the shipper’s
inspection.
We also recommend that you save all packing
materials so you will have them if you ever
need to transport the unit. Never ship the
unit without the factory pack.
YOU WILL NEED (not supplied):
• Input wiring cables
• Output wiring cables
Rack for mounting amplifier (or a stable surface
for stacking)
WARNING: Before you start to set up
your amplifier, make sure you read and
observe the Important Safety Instructions found at the beginning of this
manual.
3.2 Install Your Amplifier
CAUTION: Before you begin, make sure
your amplifier is disconnected from the
power source, with the power switch in
the “off” position and all level controls
turned completely down (counterclockwise).
Use a standard 19-inch (48.3-cm) equipment
rack (EIA RS-310B). See Figure 3.1 for amplifier dimensions.
You may also stack amps without using a
cabinet.
NOTE: When transporting, amplifiers should be
supported at both front and back.
3.3 Ensure Proper Cooling
When using an equipment rack, mount units
directly on top of each other. Close any open
spaces in rack with blank panels. DO NOT
block front, rear or side air vents. The side
walls of the rack should be a minimum of two
inches (5.1 cm) away from the amplifier sides,
and the back of the rack should be a minimum
of four inches (10.2 cm) from the amplifier back
panel.
Figure 3.2 illustrates standard amplifier airflow.
page 6
Thermal
Fault
Clip
Signal
Ready
Bridge34Bridge
12
Power
Data
Figure 3.1 Dimensions
Left: CTs 4200 Right: CTs 8200
Figure 3.2 Airflow
Operation Manual
CTs Multi-Channel Power Amplifiers
3 Setup
3.4 Choose Input Wire
and Connectors
Figure 3.3 shows connector pin assignments for balanced wiring, and Figure
3.4 shows connector pin assignments for unbalanced wiring.
When possible, use balanced wiring for signal input, which provides better
rejection of unwanted noise and hum. For more information, refer to the
Crown Amplifier Application Guide, available online at www.crownaudio.com
NOTE: Custom wiring should only be performed by qualified personnel.
3.5 Choose Output Wire and
Connectors
Crown recommends using professionally constructed, highquality, two- or four-conductor, heavy gauge speaker wire and connectors.
You may use terminal forks or bare wire for your output connectors (see Figure 3.5). CTs amplifier terminal strips accept up to 10 AWG terminal forks
which fit over a #8 screw. For best results, Crown recommends Panduit part
#PV10-10LF-L or equivalent terminal fork. Screw spacing is shown in Figure
3.5.
To connect outputs, first remove the touch-proof cover plate covering the ter-
minal strip by removing the screw which holds it in place.
To prevent the possibility of short-circuits, wrap or otherwise insulate exposed
loudspeaker cable and connectors. Also, a touch-proof cover plate, which
covers the terminal strips, is provided to help prevent short circuits. The cover
plate should be reinstalled after connecting outputs.
Suggested below are guidelines to select the appropriate size of wire based on
the distance from amplifier to speaker. Check with local code as this may vary.
Distance Wire Size
up to 25 ft (7.6 m) 16 AWG
26-40 ft (7.9-12.2 m) 14 AWG
41-60 ft (12.5-18.3 m) 12 AWG
Over 60 ft (18.3 m) 10 AWG
CAUTION: Never connect the speaker return to the chassis of the
amplifier, or damage to the amplifier may result.
CAUTION: Never use shielded cable for output wiring.
Figure 3.3 Balanced Input
Connector Wiring
See the Crown Amplifier Application Guide, available online at
www.crownaudio.com, for pin
assignments for commonly
used connector types.
Figure 3.4 Unbalanced Input
Connector Wiring
NOTE: CTs 8200 is shown. Some CTs 4200 features are in different locations.
Output panel
shown with
touch-proof
cover plate
removed.
Figure 3.5 Output Connector Wiring
(Typical of two channels)
Operation Manual
page 7
CTs Multi-Channel Power Amplifiers
3 Setup
3.6 Wire Your System
CAUTION: Never change the position of
the Mode Switch while the amplifier
power is on. See Section 5.2.2 for more
information.
3.6.1 Dual 8/4 Mode
Typical input and output wiring, along with level
control and Mode Switch settings are shown in
Figure 3.6. Make sure the Mode switch is set to
the “Dual 8/4” position.
INPUTS: Connect input wiring for each channel.
OUTPUTS: Maintain proper polarity (+/–) on
output connectors.
Connect the Channel 1 speaker’s positive (+)
lead to amplifier Channel 1 positive terminal;
repeat for negative (–). Repeat each channel wiring as for Channel 1. Refer to Section 3.5 for
output connector pin assignments.
3.6.2 Dual 70V Mode
CAUTION: Never change the position of
the Mode Switch while the amplifier
power is on. See Section 5.2.2 for more
information.
Typical input and output wiring, along with level
control and Mode Switch settings are shown in
Figure 3.7. Make sure the Mode switch is set to
the “Dual 70V” position.
INPUTS: Connect input wiring for each channel.
OUTPUTS: Maintain proper polarity (+/–) on
output connectors.
Connect Channel 1 positive (+) speaker load to
Channel 1 positive terminal of amp; repeat for
negative (–). Repeat each channel wiring as for
Channel 1. Refer to Section 3.5 for output connector pin assignments.
See the Crown Amplifier Appli-
cation Guide, available online at
www.crownaudio.com, for pin
assignments for commonly
BRIDGE
DUAL DUAL
CH 2
CH 1
used connector types.
Output panel
shown with
touch-proof
cover plate
CH 4
DUAL DUAL
BRIDGE
CH 3
removed.
Figure 3.6 System Wiring and Control Settings, Dual Mode, 8/4 Ohm
70V
BRIDGE
DUAL DUAL
CH 2
70V
CH 1
Output panel
shown with
touch-proof
cover plate
removed.
CH 4
CH 3
DUAL DUAL
BRIDGE
page 8
Figure 3.7 System Wiring and Control Settings, Dual Mode, 70V.
Operation Manual
CTs Multi-Channel Power Amplifiers
3 Setup
3.6.3 Bridge-Mono 16/8 Mode
CAUTION: Never change the position of
the Mode Switch while the amplifier
power is on. See Section 5.2.2 for more
information.
Typical input and output wiring, along with level
control and Mode Switch settings are shown in
Figure 3.8. Make sure the Mode switch is set to
the “Bridge 16/8” position.
INPUTS: Connect input wiring only to the lower(odd-) numbered channel pair.
OUTPUTS: Connect the speaker across the positive terminals of each channel pair. Do not use
the negative terminals of the channel pair when
the pair is being operated in Bridge-Mono mode.
NOTE: When operating the channel pair in
Bridge-Mono mode, turn down (full CCW) the
level control for the higher (even)-numbered
channel of the channel pair. The lower (odd)numbered level control works both channels.
3.6.4 Bridge-Mono 100V Mode
CAUTION: Never change the position of
the Mode Switch while the amplifier
power is on. See Section 5.2.2 for more
information.
Typical input and output wiring, along with level
control and Mode Switch settings are shown in
Figure 3.9. Make sure the Mode switch is set to
the “Bridge 100V” position.
INPUTS: Connect input wiring only to the lower(odd-) numbered channel pair.
OUTPUTS: Connect the speaker across the positive terminals of each channel pair. Do not use
the negative terminals of the channel pair when
the pair is being operated in Bridge-Mono mode.
NOTE: When operating the channel pair in
Bridge-Mono mode, turn down (full CCW) the
level control for the higher (even)-numbered
channel of the channel pair. The lower (odd)numbered level control works both channels.
BRIDGE
DUAL DUAL
CH 2
CH 1
Output panel
shown with
touch-proof
cover plate
removed.
CH 4
CH 3
DUAL DUAL
BRIDGE
Figure 3.8 System Wiring and Control Settings, Bridge-Mono Mode, 16/8 Ohm.
100V
BRIDGE
DUAL DUAL
CH 2
CH 1
Output panel
shown with
touch-proof
cover plate
removed.
CH 4
DUAL DUAL
BRIDGE
CH 3
Figure 3.9 System Wiring and Control Settings, Bridge-Mono Mode, 100V
See the Crown Amplifier Application Guide, available online at
www.crownaudio.com, for pin
assignments for commonly
used connector types.
Operation Manual
page 9
3 Setup
CTs Multi-Channel Power Amplifiers
3.7 Connect to AC Mains
Connect your amplifier to the AC mains power
source (power outlet) with the supplied AC power
cordset. First, connect the IEC end of the cordset to
the IEC connector on the amplifier; then, plug the
other end of the cordset to the AC mains.
WARNING: The third prong of this connector
(ground) is an important safety feature. Do
not attempt to disable this ground connection by using an adapter or other methods.
Amplifiers don’t create energy. The AC mains voltage and current must be sufficient to deliver the
power you expect. If the AC line voltage varies out
of an acceptable range, the amplifier’s power supply
turns off and the blue Power LED flashes. The
amplifier will turn back on when the AC line voltage
returns to safe operating levels. Figure 3.10 provides voltage limits for all amplifier AC voltage configurations. Also, the amplifier must be run within
the specified mains frequency requirements (indicated on the amplifier’s back panel label). If you are
unsure of the output voltage of your AC mains,
please consult your electrician.
Models
100VAC
(CTs 8200
only)
120 VAC units 108VAC 132VAC
220V/230V/
240V units
Under-Voltage
Limit
90VAC 110VAC
198VAC 264VAC
Over-Voltage
Limit
3.8 Startup Procedure
Use the following procedure when first turning on
your amplifier:
1. Turn down the level of your audio source.
2. Turn down the level controls of the amplifier.
3. Turn on the “Power” switch. The Power indicator should glow.
4. Turn up the level of your audio source to an
optimum level.
5. Turn up the Level controls on the amplifier until
the desired loudness or power level is
achieved.
6. Turn down the level of your audio source to its
normal range.
If you ever need to make any wiring or installation
changes, don’t forget to disconnect the power cord.
For help with determining your system’s optimum
gain structure (signal levels) please refer to the
Crown Amplifier Application Guide, available online
at www.crownaudio.com.
page 10
Figure 3.10 AC Under-Voltage and Ov er-Voltage
Limits for Various Amplifier Models
Operation Manual
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