Crown Audio Stereo Amplifier Power Tech 11 User Manual

Power-Tech .1 Series  
Power-Tech 1.1  
Power-Tech 2.1  
Power-Tech 3.1  
Operation Manual  
Obtaining Other Language Versions: To obtain information in another language about the use of this product, please contact your  
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  
Trademark Notice: Crown, Amcron and ODEP are registered trademarks of Crown International. Grounded Bridge is a trademark of  
Crown International. Other trademarks are the property of their respective owners.  
Some models may be exported under the name Amcron.®  
©2002 by Crown Audio, Inc. P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 574-294-8000  
132800-2  
2/02  
 
Power-Tech .1 Series Power Amplifiers  
Table of Contents  
5 Advanced Features and Options ......................................... 13  
5.1 Protection Systems .................................................... 13  
5.1.1. ODEP ................................................................. 13  
5.1.2 Ultrasonic and Radio Frequency Protection. 13  
5.1.3 Drive Protection................................................ 13  
5.1.4 Transformer Thermal Protection.................... 13  
5.1.5 Fuses and Circuit Breakers.............................. 13  
5.2 Option ........................................................................... 14  
5.2.1 MT-BB................................................................. 14  
6 Troubleshooting ...................................................................... 15  
7 Specifications ......................................................................... 16  
8 Service ..................................................................................... 17  
8.1 Worldwide Service ...................................................... 18  
8.2 US and Canada Service .............................................. 18  
8.2.1 Service at a US or Canada Service Center............. 18  
8.2.2 Factory Service ..................................................... 18  
8.2.3 Factory Service Shipping Instructions................... 18  
9 Warranty .................................................................................. 19  
Factory Service Information Form ........................................... 21  
Important Safety Instructions .............................................. 2  
Table of Contents ................................................................. 3  
1 Welcome ................................................................................... 4  
1.1 Features.......................................................................... 4  
2 How to Use This Manual ....................................................... 4  
3 Setup.......................................................................................... 5  
3.1 Unpack Your Amplifier ............................................... 5  
3.2 Install Your Amplifier .................................................. 5  
3.3 Ensure Proper Cooling ............................................... 5  
3.4 Choose Input Wire and Connectors ......................... 6  
3.5 Choose Output Wire and Connectors ...................... 7  
3.6 Wire Your System ....................................................... 8  
3.6.1 Stereo Mode...................................................... 8  
3.6.2 Bridge-Mono Mode .......................................... 8  
3.6.3 Parallel-Mono Mode......................................... 8  
3.7 Set Input Sensitivity .................................................. 9  
3.8 Connect to AC Mains .................................................. 9  
3.9 Startup Procedure ....................................................... 9  
4 Operation ................................................................................. 9  
4.1 Precautions .................................................................. 9  
4.2 Front Panel Controls and Indicators ......................... 10  
4.3 Back Panel Controls and Connectors............................. 11  
Operation Manual  
page 3  
 
Power-Tech .1 Series Power Amplifiers  
2 How to Use This  
Manual  
1 Welcome  
Safe with any load. Bridge-Mono and  
Parallel-Mono modes make it easy to opti-  
mize the amplifier’s performance for a wide  
range of loads.  
Congratulations on purchasing a Crown  
Power-Tech.1 Series amplifier. Power-Tech .1  
Series amplifiers are compact, professional  
power amplifiers engineered to meet the most  
demanding sound reinforcement needs. They  
compare very favorably to more expensive  
amplifiers, providing uncolored sound and sig-  
nal-to-noise ratios commonly associated with  
recording studios.  
This manual provides you with the necessary  
information to safely and correctly set up and  
operate your amplifier. It does not cover every  
aspect of installation, setup or operation that  
might occur under every condition. For addi-  
tional information, please consult Crown’s  
Amplifier Application Guide (available online at  
Support, your system installer or retailer.  
Complete protection against shorted out-  
puts, mismatched loads, overheating,  
input/output DC and high-frequency over-  
load; full internal fault protection.  
Balanced phone jack inputs in parallel with  
XLR input connectors. Barrier block input  
connectors are optional.  
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.  
Backed by the industry’s ONLY three-year,  
no-fault, fully transferable and extendable  
warranty.  
We strongly recommend you read all instruc-  
tions, warnings and cautions contained in this  
manual. Also, for your protection, please send  
in your warranty registration card today. And  
save your bill of sale—it’s your official proof of  
purchase.  
In addition, the Power-Tech .1 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  
The patented ODEP circuitry and  
Grounded Bridgedesign combine to pro-  
vide performance and reliability that sur-  
pass all traditional designs.  
page 4  
Operation Manual  
 
Power-Tech .1 Series Power Amplifiers  
3 Setup  
3.3 Ensure Proper Cooling  
3.2 Install Your Amplifier  
3.1 Unpack Your Amplifier  
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 or rear air vents. The side walls of  
the rack should be a minimum of 2 inches (5.1  
cm) away from the amplifier sides, and the back  
of the rack should be a minimum of 4 inches  
(10.2 cm) from the amplifier back panel.  
CAUTION: Before you begin, make sure  
your amplifier is disconnected from the  
power source, with power switch in the  
“off” position and all level controls  
turned completely down (counterclock-  
wise).  
Please unpack and inspect your amplifier for  
any damage that may have occurred during  
transit. If damage is found, notify the transpor-  
tation company immediately. Only you can ini-  
tiate a claim for shipping damage. Crown will  
be happy to help. Save the shipping carton as  
evidence of damage for the shipper’s inspec-  
tion.  
Use a standard 19-inch (48.3-cm) equipment  
rack. See Figure 3.1 for amplifier dimensions.  
Figure 3.2 illustrates standard amplifier airflow.  
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 may also stack amps without using a cabi-  
net.  
NOTE: When transporting, amplifiers should be  
supported at both front and back.  
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 Instruc-  
tions found at the beginning of this man-  
ual.  
Figure 3.1 Dimensions  
Figure 3.2 Airflow  
Operation Manual  
page 5  
 
   
Power-Tech .1 Series Power Amplifiers  
3 Setup  
3.4 Choose Input Wire  
and Connectors  
Crown recommends using pre-built or profes-  
sionally wired, balanced line (two-conductor  
plus shield), 22-24 gauge cables and connec-  
tors. If you chose the MT-BB input barrier strip  
option, use bare wire or spade lugs at the ampli-  
fier inputs. Otherwise use either 3-pin male XLR  
connectors or TRS ¼-inch phone connectors.  
Figure 3.3 shows connector pin assignments for  
balanced wiring, and Figure 3.4 shows connec-  
tor pin assignments for unbalanced wiring.  
NOTE: Custom wiring should only be per-  
formed by qualified personnel.  
Figure 3.3 Balanced Input  
Connector Wiring  
Figure 3.4 Unbalanced Input  
Connector Wiring  
page 6  
Operation Manual  
 
   
Power-Tech .1 Series Power Amplifiers  
3 Setup  
3.5 Choose Output Wire and Con-  
nectors  
Crown recommends using pre-built or profes-  
sionally wired, high-quality, two-conductor,  
heavy gauge speaker wire. Use bare wire, a dual  
banana plug or spade lugs on the amplifier end  
of each speaker cable (Figure 3.5). To prevent  
the possibility of short-circuits, wrap or other-  
wise insulate exposed loudspeaker cable con-  
nectors.  
Using the guidelines below, select the appropri-  
ate size of wire based on the distance from  
amplifier to speaker.  
Distance  
up to 25 ft.  
26-40 ft.  
Wire Size  
16 gauge  
14 gauge  
12 gauge  
10 gauge  
8 gauge  
41-60 ft.  
Figure 3.5 Output Connector Wiring  
61-100 ft.  
101-150 ft.  
151-250 ft.  
6 gauge  
CAUTION: Never use shielded cable for  
output wiring.  
Operation Manual  
page 7  
 
Power-Tech .1 Series Power Amplifiers  
3 Setup  
3.6 Wire Your System  
3.6.3 Parallel-Mono Mode  
Turn down the Level controls (fully counter-  
clockwise) and turn off the amplifier before wir-  
ing it as described below. Refer to Figure 3.6.  
CAUTION: Parallel-Mono wiring requires  
installation of a jumper wire. Do not  
switch to Stereo or Bridge-Mono mode  
until this output jumper wire is removed.  
3.6.1 Stereo Mode  
IMPORTANT: The Channel 2 IOC indicator  
will remain lit when operating in Paral-  
lel-Mono mode.  
Set the back panel stereo/mono switch to Stereo.  
INPUTS: Connect input wiring to both channels.  
Set the back panel stereo/mono switch to  
Parallel-Mono.  
OUTPUTS: Maintain proper polarity (+/–) on  
output connectors.  
INPUTS: Connect input wiring to Channel 1  
only.  
Connect Channel 1 positive (+) speaker load to  
Channel 1 positive terminal of amp; repeat for  
negative (–). Repeat Channel 2 wiring as for  
Channel 1.  
OUTPUTS: Add a 14 AWG gauge (or larger)  
jumper between the red(+) Channel 1 and Chan-  
nel 2 binding posts. Connect the speaker posi-  
tive (+) lead to the Channel 1 red (+) terminal.  
Connect the speaker negative (–) lead to the  
Channel 1 black (–) terminal.  
3.6.2 Bridge-Mono Mode  
Set the back panel stereo/mono switch to  
Bridge-Mono.  
INPUTS: Connect input wiring to Channel 1  
only.  
NOTE: Use only the Channel 1 level con-  
trol.  
OUTPUTS: Connect the speaker across the posi-  
tive terminals of each channel. Do not use the  
negative terminals when the amp is being oper-  
ated in Bridge-Mono mode.  
NOTE: Crown provides a reference of wiring pin  
assignments for commonly used connector  
types in the Crown Amplifier Application Guide,  
NOTE: The Channel 2 level control should  
be set fully counter-clockwise when oper-  
ating the amplifier in Bridge-Mono mode.  
Figure 3.6 Three System Connection Methods  
page 8  
Operation Manual  
 
Power-Tech .1 Series Power Amplifiers  
3 Setup  
3.8 Connect to AC Mains  
3.7 Set Input Sensitivity  
4 Operation  
4.1 Precautions  
Your amplifier is protected from internal and  
external faults, but you should still take the fol-  
lowing precautions for optimum performance  
and safety:  
Connect your amplifier's power cord to the AC  
mains power source (power outlet).  
The input sensitivity switch inside the amplifier  
is set to 0.775 volt RMS at the factory. (Factory  
setting for international models is 1.4V). It can  
be changed to 1.4 volts or a voltage gain of 26  
dB. The 26 dB gain setting is equivalent to a  
sensitivity of 2.1 volts for the Power-Tech 1.1,  
2.6 volts for the Power-Tech 2.1 and 3.3 volts  
for the Power-Tech 3.1.  
WARNING: The third prong of this con-  
nector (ground) is an important safety  
feature. Do not attempt to disable this  
ground connection by using an adapter  
or other methods.  
1. Before use, configure your amplifier for  
proper operation as described in the Setup sec-  
tion of this manual. Improper wiring can result  
in serious operating difficulties. For advanced  
setup techniques, consult Crown's Amplifier  
Application Guide available online at  
Amplifiers don't create energy. The AC mains  
voltage and current must be sufficient to deliver  
the power you expect. You must operate your  
amplifier from an AC mains power source with  
not more than 10% variation above or below  
the amplifier's specified line voltage and within  
the specified 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.  
To change the input sensitivity:  
1. Turn off and unplug the amplifier from the  
AC source.  
2. Remove the input module on the back panel.  
3. Locate the labeled access hole for the sensi-  
tivity switch (Figure 3.7). The sensitivity switch  
will not be visible because it is mounted below  
the hole. Use your little finger to reach it.  
2. Use care when making connections, select-  
ing signal sources and controlling the output  
level. The load you save may be your own!  
3. Do not short the ground lead of an output  
cable to the input signal ground. This may form  
a ground loop and cause oscillations.  
4. Set the switch to the desired position.  
5. Replace the input module.  
3.9 Startup Procedure  
Use the following procedure when first turning  
on your amplifier:  
4. Never connect the output to a power supply,  
battery or power main. Electrical shock may  
result.  
1. Turn down the level of your audio source.  
2. Turn down the Level controls of the amplifier.  
5. Tampering with the circuitry, or making  
unauthorized circuit changes may be hazardous  
and invalidates all agency listings.  
3. Turn on the Power switch. The Enable indica-  
tor next to the Power switch should glow.  
6. Do not operate the amplifier with the IOC  
LED constantly flashing yellow.  
4. Turn up the level of your audio source to an  
optimum level.  
7. Do not overdrive the mixer, which will cause  
clipped signal to be sent to the amplifier. Such  
signals will be reproduced with extreme accu-  
racy, and loudspeaker damage may result.  
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.  
8. Do not operate the amplifier with less than  
the rated load impedance. Due to the amplifier's  
output protection, such a configuration may  
result in premature clipping and speaker  
damage.  
If you ever need to make any wiring or installa-  
tion changes, don't forget to disconnect  
the power cord.  
Figure 3.7 Input Sensitivity Switch  
For help with determining your system's opti-  
mum gain structure (signal levels) please refer  
to the Crown Amplifier Application Guide,  
Crown is not liable for damage that results from  
overdriving other system components.  
Operation Manual  
page 9  
 
Power-Tech .1 Series Power Amplifiers  
4 Operation  
4.2 Front Panel Controls and Indicators  
C. Enable Indicator  
Enable indicator shows the on/off status of the low-  
voltage supply.  
The diagram below explains the controls and indicators  
on the front panel of the Power-Tech .1 Series.  
D. Power Switch  
A. Level Controls  
Power switch (and circuit breaker for the Power-Tech  
1.1, Power-Tech 2.1 and 220/240 VAC Power-Tech  
3.1).  
Continuously variable level controls for each channel.  
B. SPI/IOC Indicator  
Dual-function indicator for each channel flashes green  
for signal presence (SPI) and yellow if any distortion  
exceeds 0.05% (IOC).  
E. Ventilation Grille  
Removable grille and dust filter.  
Figure 3.8 Power-Tech .1 Series Front Panel Controls and Indicators  
page 10  
Operation Manual  
 
CTs Multi-Channel Power Amplifiers  
4 Operation  
4.3 Back Panel Controls and Connec-  
tors  
G. Reset Switch  
Circuit breaker reset switch (100/120 VAC Power-Tech  
3.1 only)  
The diagram below explains the controls and connec-  
tors on the back panel of the Power-Tech .1 Series.  
H. Power Cord  
F. Stereo/mono Switch  
Stereo/mono switch for selecting Stereo, Bridge-Mono  
or Parallel-Mono modes.  
I. XLR Input Connectors  
Balanced XLR connectors for input.  
J. 1/4-inch Input Connectors  
1/4-inch balanced phone jacks for input.  
Figure 3.9 Power-Tech .1 Series Back Panel Controls and Connectors  
Operation Manual  
page 11  
 
CTs Multi-Channel Power Amplifiers  
This page intentionally left blank.  
page 12  
Operation Manual  
 
Power-Tech .1 Series Power Amplifiers  
5 Advanced Features  
and Options  
5.1.4 Transformer Thermal  
Protection  
5.1.2 Ultrasonic and Radio Fre-  
quency Protection  
NOTE: For detailed information about  
these Crown amplifier features, please  
consult the Crown Amplifier Application  
Guide, available on the Crown website  
This activates in the rare case where the unit's  
transformer temperature rises to unsafe levels.  
Then the amplifier will remove power to the  
high-voltage transformer. The fan will continue  
to run in all units except those with 220/240  
VAC transformers. The amplifier will return to  
normal after it cools to a safe temperature.  
An amplifier's slew rate only needs to be large  
enough to deliver the maximum voltage at the  
highest required frequency. Higher slew rates  
actually let the amplifier reproduce undesirable  
frequencies. By design, Power-Tech .1 Series  
amplifiers have a controlled slew rate to put a  
frequency limit on the highest frequencies that  
they reproduce. This limit occurs well above 20  
kHz, so there is no audible effect on perfor-  
mance. This approach protects the amplifier  
from radio frequencies and can even protect  
some sensitive loads (including some tweet-  
ers).  
5.1 Protection Systems  
Your Crown amplifier provides extensive pro-  
tection systems, including ODEP, ultrasonic/RF  
protection, drive protection, transformer ther-  
mal protection and fuses or circuit breakers to  
protect the power supplies.  
Your amplifier is designed to keep working  
under conditions where other amplifiers would  
fail. But even when you exceed the limits of a  
Power-Tech .1 Series amplifier, it still protects  
itself — and your investment — from damage.  
5.1.1 ODEP  
Crown invented ODEP to prevent amplifier  
shutdown during demanding operation, and to  
increase the efficiency of the output circuitry.  
5.1.5 Fuses and Circuit Breakers  
5.1.3 Drive Protection  
Your amplifier's low-voltage power supply is  
protected by an internal fuse, and its high-volt-  
age power supplies are protected by a circuit  
breaker. The circuit breaker is built into the  
power switch for all Power-Tech 1.1, Power-  
Tech 2.1 and 220/240 VAC Power-Tech 3.1  
amplifiers. The circuit breaker is located on the  
back panel of 100/120 VAC Power-Tech 3.1  
amplifiers.  
This system temporarily removes output drive  
to protect the amplifier and its loads. Drive pro-  
tection can be activated in two situations. First,  
if dangerous subsonic frequencies or direct  
current (DC) is detected in the amplifier's out-  
put, drive protection will activate. The amplifier  
resumes normal operation when it no longer  
detects dangerous output. Activating this pro-  
tection is very unlikely, but improper source  
signals like infrasonic square waves or a  
severely clipped input signal can activate this  
system.  
To do this, Crown measured the safe operating  
area (SOA) of each output transistor before  
installing it in an amplifier. Next, Crown  
designed intelligent circuitry to simulate the  
instantaneous operating conditions of those  
output transistors. Its name describes what it  
does: Output Device Emulation Protection or  
ODEP. In addition to simulating output transis-  
tor operating conditions, it compares their  
operation to their known SOA. If ODEP sees  
that more power will be asked of the output  
devices than they can deliver, ODEP immedi-  
ately limits the drive level until it falls within the  
SOA. Limiting is proportional and kept to an  
absolute minimum—only what is required to  
prevent output transistor damage. Under nor-  
mal conditions, no limiting is required and  
ODEP is transparent to the audio signal.  
With rated loads and output levels, the circuit  
breaker will shut down the amplifier only in the  
rare instance of a catastrophic amplifier failure.  
Other protection systems such as ODEP keep  
the amplifier operational under most other  
severe conditions. The breaker can also shut  
down the amplifier if extremely low-impedance  
loads and high output levels result in current  
draw that exceeds the breaker rating.  
Second, the amplifier's fault protection system  
puts the affected channel into drive protection  
mode in rare situations where heavy common-  
mode current is detected in its output. The  
amplifier should never output heavy common-  
mode current unless its circuitry is damaged.  
Activating drive protection helps prevent further  
damage.  
Operation Manual  
page 13  
 
Power-Tech .1 Series Power Amplifiers  
5 Advanced Features  
and Options  
Again, this should be possible only when oper-  
ating outside rated conditions, as when the  
amplifier is used to drive a 1-ohm load, or  
when driving a severely clipped signal.  
A Power-Tech .1 Series amplifier will not blow  
its fuse or trip its breaker unless something is  
wrong. In the rare event that an internal fuse  
blows, please refer the unit to a qualified tech-  
nician. If a breaker trips, try to identify and cor-  
rect the problem before resetting the breaker.  
The breaker for the Power-Tech 1.1 and 2.1 can  
be reset using the front panel power switch. The  
circuit breaker for a Power-Tech 3.1 can be  
reset using the back panel reset switch. If the  
problem persists, refer the unit to an authorized  
Crown Service Center.  
5.2 Option  
5.2.1 MT-BB  
The MT-BB is an accessory panel that provides  
barrier strip input connectors. An MT-BB  
accessory might be desirable in applications  
requiring bare wire or spade lug connections.  
Like other unused input connectors on your  
Power-Tech .1 Series amplifier, these barrier  
strip connectors can be used to daisy chain an  
input signal from one amplifier to another.  
-
C H - 2 I N P U T  
C H - 1 I N P U T  
MT BB  
+
+
Important: The MT-BB must be installed  
at a Crown Factory Service Center or the  
Crown factory.  
page 14  
Operation Manual  
 
Power-Tech .1 Series Power Amplifiers  
6 Troubleshooting  
CONDITION: No power to the  
amplifier.  
CONDITION: No sound.  
POSSIBLE REASON:  
POSSIBLE REASON:  
The amplifier has just been turned on and is  
still in the 4-second turn-on delay.  
The amplifier's Power switch is off.  
The amplifier is not plugged into the power  
receptacle.  
The amplifier is in drive protection mode. This  
can occur with improper source signals like  
infrasonic square waves or input overloads  
that excessively clip the input signal.  
The amplifier's low-voltage power supply fuse  
has blown. Return amp to Crown or an autho-  
rized Crown Service Center for servicing.  
The breaker has tripped. First disconnect your  
speakers from the affected channel(s) one by  
one to determine if one of the loads is shorted.  
Reset the breaker and apply an input signal. If  
the signal presence indicator flashes, then try a  
different speaker or cable to determine where  
the short is occurring. If no short can be found,  
turn off the amp and allow the amp to cool. If  
indicators do not return to normal after restart-  
ing your amp, return amp to Crown or an  
CONDITION: Distorted sound.  
POSSIBLE REASON:  
authorized Crown Service Center for servicing.  
Input signal level is too high. Turn down your  
amplifier level controls. NOTE: Your amplifier  
should never be operated at a level which  
causes the IOC LEDs to flash yellow con-  
stantly.  
Input signal level is very low.  
Level controls are turned down.  
Input cables are not connected.  
Key  
Off  
Lit  
Green Lit  
Yellow Lit  
Operation Manual  
page 15  
 
Power-Tech .1 Series Power Amplifiers  
7 Specifications  
Minimum Guaranteed Power  
Power-Tech 1.1  
Power-Tech 2.1  
Power-Tech 3.1  
120 VAC, 60 Hz Units, Stereo mode, per channel, both channels driven  
1 kHz with 0.1% THD  
Stereo, 4 ohms per ch.  
Stereo, 8 ohms per ch.  
305  
220  
460  
325  
760  
540  
120 VAC, 60 Hz Units, Bridge mono mode  
1 kHz with 0.1% THD  
8 ohms  
16 ohms  
605  
445  
910  
660  
1,525  
1,090  
120 VAC, 60 Hz Units, Parallel mono mode  
1 kHz with 0.1% THD  
2 ohms  
4 ohms  
605  
440  
920  
655  
1,530  
1,080  
Performance  
Power-Tech 1.1  
0.1 dB  
Power-Tech 2.1  
0.1 dB  
Power-Tech 3.1  
0.1 dB  
Frequency Response (at 1 watt, 20Hz - 20 kHz)  
Phase Response (at 1 watt, 10Hz - 20 kHz)  
10°  
10°  
10°  
Signal to Noise Ratio below rated power (20 Hz to 20 kHz)  
Total Harmonic Distortion (THD) at rated power, from 20 Hz to 1 kHz  
Total Harmonic Distortion (THD) at rated power, at 20 kHz  
>100 dB  
< 0.05%  
< 0.1%  
>100 dB  
< 0.05%  
< 0.1%  
>100 dB  
< 0.05%  
< 0.1%  
Intermodulation Distortion (IMD) 60 Hz and 7 kHz at 4:1,  
from 163 milliwatts to full bandwidth power  
< 0.05%  
< 0.05%  
< 0.05%  
Damping Factor: 10 Hz to 400 Hz  
>1000  
> 60 dB  
>1000  
> 60 dB  
>1000  
> 60 dB  
Crosstalk (below rated power, 20 Hz to 1 kHz)  
Controlled Slew Rate  
>13 volts/ms  
20 k ohms, 10 k ohms  
>13 volts/ms  
20 k ohms, 10 k ohms  
>13 volts/ms  
20 k ohms, 10 k ohms  
Input Impedance nominally balanced, nominally unbalanced  
Load Impedance (Note: Safe with all types of loads)  
Stereo  
Bridge Mono  
Parallel Mono  
4-8 ohms  
8-16 ohms  
2-4 ohms  
4-8 ohms  
8-16 ohms  
2-4 ohms  
4-8 ohms  
8-16 ohms  
2-4 ohms  
Voltage Gain (at maximum level setting)  
0.775V sensitivity  
1.4V sensitivity  
35 dB  
30 dB  
36 dB  
31 dB  
38 dB  
33 dB  
Required AC Mains (configured country-specific)  
Power Draw at Idle (configured country-specific)  
50/60 Hz, 100-240VAC (+10%, -15%)  
90 watts or less  
50/60 Hz, 100-240VAC (+10%, -15%)  
90 watts or less  
50/60 Hz, 100-240VAC (+10%, -15%)  
90 watts or less  
page 16  
Operation Manual  
 
Power-Tech .1 Series Power Amplifiers  
7 Specifications  
Performance (continued)  
Power-Tech 1.1  
Power-Tech 2.1  
Power-Tech 3.1  
AC Line Current  
100 and 120 VAC units  
220 and 240 VAC units  
6 A  
3 A  
10 A  
5 A  
15 A  
7 A  
Ventilation  
Cooling  
Flow-through ventilation from  
front to side panels  
Flow-through ventilation from  
front to side panels  
Flow-through ventilation from  
front to side panels  
Internal heat sinks with forced-air cooling  
for rapid, uniform heat dissipation  
Internal heat sinks with forced-air cooling for  
rapid, uniform heat dissipation  
Internal heat sinks with forced-air cooling for  
rapid, uniform heat dissipation  
Dimensions  
Width  
EIA Standard 19-inch (48.3 cm) rack mount  
(EIA RS-310-B)  
EIA Standard 19-inch (48.3 cm) rack mount  
(EIA RS-310-B)  
EIA Standard 19-inch (48.3 cm) rack mount  
(EIA RS-310-B)  
Height  
Depth  
3.5 inches (8.9 cm  
16 inches (40.6 cm)  
3.5 inches (8.9 cm  
16 inches (40.6 cm)  
3.5 inches (8.9 cm  
16 inches (40.6 cm)  
Weight (120VAC, 60 Hz units)  
Net Weight  
Shipping Weight  
30 lb (13.6 kg)  
34 lb (15.4 kg)  
33 lb (15.0kg)  
37 lb (16.8kg)  
36 lb 8 oz (16.6 kg)  
40 lb 8 oz (18.4 kg)  
Weight (International units)  
Net Weight  
Shipping Weight  
31 lb 2 oz (14.1 kg)  
34 lb 9 oz (15.7 kg)  
35 lb 12 oz (16.9 kg)  
38 lb 13 oz (17.6 kg)  
37 lb 3 oz (16.6 kg)  
40 lb 16 oz (18.6 kg)  
Operation Manual  
page 17  
 
Power-Tech .1 Series Power Amplifiers  
8 Service  
shipping pack, however we still recom-  
mend using a Crown Supplied Shipping  
Container. Minimum recommended  
requirements for materials are as follows:  
275 P.S.I. burst test Double-Wall carton  
that allows for 2-inch solid Styrofoam on  
all six sides of unit or 3 inches of plastic  
bubble wrap on all six sides of unit;  
securely seal the package with an adequate  
carton sealing tape. Do not use light boxes  
or "peanuts." Damage caused by poor  
packing cannot be covered under warranty.  
8.2.2 Factory Service  
Crown amplifiers are quality units that rarely  
require servicing. Before returning your unit for  
servicing, please contact Crown Factory Ser-  
vice to verify the need for servicing.  
To obtain factory service, fill out the service  
information page found in the back of this man-  
ual and send it along with your proof of pur-  
chase and the defective unit to the Crown  
factory.  
This unit has very sophisticated circuitry which  
should only be serviced by a fully trained tech-  
nician. This is one reason why each unit bears  
the following label:  
For warranty service, we will pay for ground  
shipping both ways in the United States. Con-  
tact Crown Factory Service to obtain prepaid  
shipping labels prior to sending the unit. Or, if  
you prefer, you may prepay the cost of ship-  
ping, and Crown will reimburse you. Send cop-  
ies of the shipping receipts to Crown Factory  
Service to receive reimbursement.  
CAUTION: To prevent electric shock, do  
not remove covers. No user serviceable  
parts inside. Refer servicing to a quali-  
fied technician.  
4. Do not ship the unit in any kind of cabinet  
(wood or metal). Ignoring this warning  
may result in extensive damage to the unit  
and the cabinet. Accessories are not  
8.1 Worldwide Service  
Service may be obtained from an authorized  
service center. (Contact your local Crown/  
Amcron representative or our office for a list of  
authorized service centers.) To obtain service,  
simply present the bill of sale as proof of pur-  
chase along with the defective unit to an autho-  
rized service center. They will handle the  
necessary paperwork and repair.  
Your repaired unit will be returned via UPS  
ground. Please contact us if other arrange-  
ments are required.  
needed-do not send the product documen-  
tation, cables and other hardware.  
If you have any questions, please contact  
Crown Factory Service.  
8.2.3 Factory Service Shipping  
Instructions:  
Crown Factory Service  
1718 W. Mishawaka Rd.,  
Elkhart, Indiana 46517 U.S.A.  
1. Before sending a Crown product to the  
factory for service, first call the Crown  
Factory Service for a return authorization  
(RA) number.  
Remember to transport your unit in the original  
factory pack.  
Telephone: 574-294-8200  
800-342-6939 (North America,  
Puerto Rico, and Virgin Islands only)  
2. Be sure to fill out the service information  
form that follows and enclose it with your  
shipment, either inside the box or in a  
packing slip envelope securely attached to  
the outside of the shipping carton. Do not  
send the service information form sepa-  
rately. If you are sending the unit from a  
Shipping Center, we recommend taping  
the form to the product. We also recom-  
mend recording the serial number and  
model before shipping for your reference.  
8.2 US and Canada Service  
Service may be obtained in one of two ways:  
from an authorized service center or from the  
factory. You may choose either. It is important  
that you have your copy of the bill of sale as  
your proof of purchase.  
Facsimile:  
574-294-8301 (Technical Support)  
574-294-8124 (Factory Service)  
Internet:  
8.2.1 Service at a US or Canada  
Service Center  
This method usually saves the most time and  
effort. Simply present your bill of sale along  
with the defective unit to an authorized service  
center to obtain service. They will handle the  
necessary paperwork and repair. Remember to  
transport the unit in the original factory pack. A  
list of authorized service centers in your area  
can be obtained from the Crown website at  
Factory Service.  
3. To ensure the safe transportation of your  
unit to the factory, ship it in an original  
factory packing container. If you don't have  
the original carton, you may obtain a prod-  
uct service foam-in-place shipping pack  
from the Crown Factory Service at the  
number listed below. For non-warranty  
service, you may also provide your own  
page 18  
Operation Manual  
 
Power-Tech .1 Series Power Amplifiers  
9 Warranty  
UNITED STATES & CANADA  
SUMMARY OF WARRANTY  
est, insurance, closing costs, and other finance  
charges less a reasonable depreciation on the  
product from the date of original purchase. War-  
ranty work can only be performed at our autho-  
rized service centers or at the factory. Warranty  
work for some products can only be performed at  
our factory. We will remedy the defect and ship  
the product from the service center or our factory  
within a reasonable time after receipt of the defec-  
tive product at our authorized service center or  
our factory. All expenses in remedying the defect,  
including surface shipping costs in the United  
States, will be borne by us. (You must bear the  
expense of shipping the product between any for-  
eign country and the port of entry in the United  
States including the return shipment, and all  
taxes, duties, and other customs fees for such for-  
eign shipments.)  
FROM ANY DEFECT IN THE NEW CROWN  
PRODUCT. THIS INCLUDES ANY DAMAGE TO  
ANOTHER PRODUCT OR PRODUCTS RESULT-  
ING FROM SUCH A DEFECT. SOME STATES DO  
NOT ALLOW THE EXCLUSION OR LIMITATIONS  
OF INCIDENTAL OR CONSEQUENTIAL DAM-  
AGES, SO THE ABOVE LIMITATION OR EXCLU-  
SION MAY NOT APPLY TO YOU.  
Crown International, 1718 West Mishawaka Road,  
Elkhart, Indiana 46517-4095 U.S.A. warrants to  
you, the ORIGINAL PURCHASER and ANY SUB-  
SEQUENT OWNER of each NEW Crown product,  
for a period of three (3) years from the date of  
purchase by the original purchaser (the “warranty  
period”) that the new Crown product is free of  
defects in materials and workmanship. We further  
warrant the new Crown product regardless of the  
reason for failure, except as excluded in this War-  
ranty.  
WARRANTY ALTERATIONS  
No person has the authority to enlarge, amend, or  
modify this Crown Warranty. This Crown War-  
ranty is not extended by the length of time which  
you are deprived of the use of the new Crown  
product. Repairs and replacement parts provided  
under the terms of this Crown Warranty shall  
carry only the unexpired portion of this Crown  
Warranty.  
ITEMS EXCLUDED FROM THIS  
CROWN WARRANTY  
This Crown Warranty is in effect only for failure of  
a new Crown product which occurred within the  
Warranty Period. It does not cover any product  
which has been damaged because of any inten-  
tional misuse, accident, negligence, or loss which  
is covered under any of your insurance contracts.  
This Crown Warranty also does not extend to the  
new Crown product if the serial number has been  
defaced, altered, or removed.  
HOW TO OBTAIN WARRANTY  
SERVICE  
DESIGN CHANGES  
We reserve the right to change the design of any  
product from time to time without notice and with  
no obligation to make corresponding changes in  
products previously manufactured.  
You must notify us of your need for warranty ser-  
vice within the warranty period. All components  
must be shipped in a factory pack, which, if  
needed, may be obtained from us free of charge.  
Corrective action will be taken within a reason-  
able time of the date of receipt of the defective  
product by us or our authorized service center. If  
the repairs made by us or our authorized service  
center are not satisfactory, notify us or our autho-  
rized service center immediately.  
LEGAL REMEDIES OF PURCHASER  
WHAT THE WARRANTOR WILL DO  
THIS CROWN WARRANTY GIVES YOU SPECIFIC  
LEGAL RIGHTS, YOU MAY ALSO HAVE OTHER  
RIGHTS WHICH VARY FROM STATE TO STATE.  
No action to enforce this Crown Warranty shall be  
commenced after expiration of the warranty  
period.  
We will remedy any defect, regardless of the rea-  
son for failure (except as excluded), by repair,  
replacement, or refund. We may not elect refund  
unless you agree, or unless we are unable to pro-  
vide replacement, and repair is not practical or  
cannot be timely made. If a refund is elected, then  
you must make the defective or malfunctioning  
product available to us free and clear of all liens  
or other encumbrances. The refund will be equal  
to the actual purchase price, not including inter-  
DISCLAIMER OF CONSEQUENTIAL  
AND INCIDENTAL DAMAGES  
THIS STATEMENT OF WARRANTY SUPERSEDES  
ANY OTHERS CONTAINED IN THIS MANUAL  
YOU ARE NOT ENTITLED TO RECOVER FROM  
US ANY INCIDENTAL DAMAGES RESULTING  
FOR CROWN PRODUCTS.  
12/01  
Operation Manual  
page 19  
 
Power-Tech .1 Series Power Amplifiers  
9 Warranty  
WORLDWIDE EXCEPT USA & CANADA  
SUMMARY OF WARRANTY  
replacement, or refund. We may not elect refund  
unless you agree, or unless we are unable to pro-  
vide replacement, and repair is not practical or  
cannot be timely made. If a refund is elected, then  
you must make the defective or malfunctioning  
product available to us free and clear of all liens  
or other encumbrances. The refund will be equal  
to the actual purchase price, not including inter-  
est, insurance, closing costs, and other finance  
charges less a reasonable depreciation on the  
product from the date of original purchase. War-  
ranty work can only be performed at our autho-  
rized service centers. We will remedy the defect  
and ship the product from the service center  
within a reasonable time after receipt of the defec-  
tive product at our authorized service center.  
DISCLAIMER OF CONSEQUENTIAL AND  
INCIDENTAL DAMAGES  
Crown International, 1718 West Mishawaka Road,  
Elkhart, Indiana 46517-4095 U.S.A. warrants to  
you, the ORIGINAL PURCHASER and ANY SUB-  
SEQUENT OWNER of each NEW Crown1 product,  
for a period of three (3) years from the date of pur-  
chase by the original purchaser (the “warranty  
period”) that the new Crown product is free of  
defects in materials and workmanship, and we  
further warrant the new Crown product regardless  
of the reason for failure, except as excluded in this  
Warranty.  
YOU ARE NOT ENTITLED TO RECOVER FROM US  
ANY INCIDENTAL DAMAGES RESULTING FROM  
ANY DEFECT IN THE NEW CROWN PRODUCT.  
THIS INCLUDES ANY DAMAGE TO ANOTHER  
PRODUCT OR PRODUCTS RESULTING FROM  
SUCH A DEFECT.  
WARRANTY ALTERATIONS  
No person has the authority to enlarge, amend, or  
modify this Crown Warranty. This Crown Warranty  
is not extended by the length of time which you are  
deprived of the use of the new Crown product.  
Repairs and replacement parts provided under the  
terms of this Crown Warranty shall carry only the  
unexpired portion of this Crown Warranty.  
1
Note: If your unit bears the name “Amcron,” please substitute  
it for the name “Crown” in this warranty.  
ITEMS EXCLUDED FROM THIS CROWN-  
WARRANTY  
HOW TO OBTAIN WARRANTY SERVICE  
You must notify your local Crown importer of  
your need for warranty service within the warranty  
period. All components must be shipped in the  
original box. Corrective action will be taken within  
a reasonable time of the date of receipt of the  
defective product by our authorized service center.  
If the repairs made by our authorized service cen-  
ter are not satisfactory, notify our authorized ser-  
vice center immediately.  
This Crown Warranty is in effect only for failure of  
a new Crown product which occurred within the  
Warranty Period. It does not cover any product  
which has been damaged because of any inten-  
tional misuse, accident, negligence, or loss which  
is covered under any of your insurance contracts.  
This Crown Warranty also does not extend to the  
new Crown product if the serial number has been  
defaced, altered, or removed.  
DESIGN CHANGES  
We reserve the right to change the design of any  
product from time to time without notice and with  
no obligation to make corresponding changes in  
products previously manufactured.  
LEGAL REMEDIES OF PURCHASER  
No action to enforce this Crown Warranty shall be  
commenced after expiration of the warranty  
period.  
WHAT THE WARRANTOR WILL DO  
We will remedy any defect, regardless of the rea-  
son for failure (except as excluded), by repair,  
THIS STATEMENT OF WARRANTY SUPERSEDES  
ANY OTHERS CONTAINED IN THIS MANUAL FOR  
CROWN PRODUCTS.  
7/01  
page 20  
Operation Manual  
 
Power-Tech .1 Series Power Amplifiers  
Crown Factory Service Information  
Shipping Address: Crown International, Factory Service, 1718 W. Mishawaka Rd., Elkhart, IN 46517  
Phone: 1-800-342-6939 or 1-574-294-8200 Fax: 1-574-294-8124  
Owner’s Name : __________________________________________________________________________________________________________________________________________________________________  
Shipping Address: ________________________________________________________________________________________________________________________________________________________________  
Phone Number: ____________________________________Fax Number: _______________________________ Email:______________________________________________________________________________  
Model: ____________________________________________________________________________________ Serial Number: _______________________________________________________________________  
Purchase Date : __________________________________________________________________________________________________________________________________________________________________  
NATURE OF PROBLEM  
(Be sure to describe the conditions that existed when the problem occurred and what attempts were made to correct it.)  
____________________________________________________________________________________________________________________________________________________________________________________  
____________________________________________________________________________________________________________________________________________________________________________________  
____________________________________________________________________________________________________________________________________________________________________________________  
____________________________________________________________________________________________________________________________________________________________________________________  
____________________________________________________________________________________________________________________________________________________________________________________  
____________________________________________________________________________________________________________________________________________________________________________________  
____________________________________________________________________________________________________________________________________________________________________________________  
____________________________________________________________________________________________________________________________________________________________________________________  
____________________________________________________________________________________________________________________________________________________________________________________  
Other equipment in system: ______________________________________________________________________________________________________________________________________________________________  
____________________________________________________________________________________________________________________________________________________________________________________  
____________________________________________________________________________________________________________________________________________________________________________________  
____________________________________________________________________________________________________________________________________________________________________________________  
If warranty has expired, payment will be:  
Cash/Check  
VISA  
MasterCard  
C.O.D.  
Purchase Order for Crown Dealer  
Card Number:______________________________________ Exp. Date:___________________  
Signature:______________________________________________________________________  
ENCLOSE THIS PORTION WITH THE UNIT. DO NOT MAIL SEPARATELY.  
Operation Manual  
page 21  
 
Power-Tech .1 Series Power Amplifiers  
page 22  
Operation Manual  
 
Power-Tech .1 Series Power Amplifiers  
Operation Manual  
page 23  
 
 

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