Crown 1201, 2400, 1200, 601, 2401 User Manual
...
Micro-Tech Series
Operation Manual
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:
Crown International. Other trademarks are the property of their respective owners.
Crown, Amcron and ODEP are registered trademarks of Crown International. Grounded Bridge is a trademark of
To obtain information in another language about the use of this product, please contact your
Micro-Tech
600, 1200, & 2400
Micro-Tech
601, 1201, & 2401
Some models may be exported under the name Amcron.
©2003 by Crown Audio, Inc. P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 574-294-8000
®
102990-6A
03/03
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 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, 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) To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.
Micro-Tech Series Power Amplifiers
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.
IMPORTANT
The Micro-Tech 2400/2401 requires Class 1
output wiring. The Micro-Tech 600/601/ &
1200/1201 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.
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.
page 2
Operation Manual
Micro-Tech Series Power Amplifiers
Table of Contents
Important Safety Instructions ...........................2
1 Welcome ..........................................................4
1.1 Features ...................................................... 4
1.2 Unpacking Your Amplifier ........................... 4
2 How to Use This Manual ............................... 4
3 Setup .................................................................5
3.1 Unpack Your Amplifier ............................... 5
3.2 Install Your Amplifier .................................5
3.2 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 Set Ground Lift Switch ...............................9
3.9 Connect to AC Mains ................................ 9
3.10 Startup Procedure .................................... 9
4 Operation ........................................................ 10
4.1 Precautions ................................................10
4.2 Controls, Indicators and Connectors .......... 11
4.2.1 Front Panel Facilities ......................... 11
4.2.2 Rear Panel Facilites............................ 12
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 Accessories ................................................................... 14
5.2.1 Cooling Fan Options ............................................ 14
5.2.2 Input Connectors Option ..................................... 14
5.3 Filter Cleaning ............................................................... 14
6 Principles of Operation .....................................................15
6.1 Overview ....................................................................... 15
6.2 Circuit Theory ............................................................... 15
6.2.1 Stereo Operation ................................................... 16
6.2.2 Bridge-Mono Operation ........................................ 17
6.2.3 Parallel-Mono Operation ......................................17
7 Troubleshooting .................................................................. 18
8 Specifications .....................................................................19
9 AC Power Draw and Thermal Dissipation ..................... 21
10 Service .............................................................................. 23
10.1 Worldwide Service ........................................................23
10.2 US and Canada Service ................................................ 23
10.2.1 Service at a US or Canada Service Center ..........23
10.2.2 Factory Service ................................................... 23
10.2.3 Factory Service Shipping Instructions ................ 23
11 Warranty ............................................................................. 24
Crown Factory Service Information Form ................................... 27
Operation Manual
page 3
Micro-Tech Series Power Amplifiers
1 Welcome
Crown's Micro-Tech 600, 1200 and 2400 are
the original industry standards for touring
amplifiers. Micro-Tech amplifiers are known
around the world as the benchmark for highdensity, ultra-pure power in a compact, lightweight package. In addition, each model gives
you Crown's legendary ODEP
keep the show going long after other amplifiers
would fail.
Models MT-601, 1201 and 2401(for Japan) are
identical to corresponding models MT-600,
1200 and 2400.
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, the Micro-Tech 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
• Grounded Bridge™ design delivers
incredible voltage swings without stressing output transistors. This results in significantly lower distortion and superior
reliability.
®
protection to
• Patented ODEP
tion Protection) circuitry compensates for
overheating and overload to keep the
amplifier working.
• High damping factor provides superior
motion control over low-frequency drivers
for clean, accurate low end.
• Two mono modes (Bridge-Mono and Parallel-Mono) for driving a wide range of
load impedances.
• Full protection against shorted outputs,
open circuits, DC, mismatched loads,
general overheating, high-frequency overloads and internal faults.
1.2 Unpacking 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.
®
(Output Device Emula-
2 How to Use This Manual
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 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. And
save your bill of sale-it's your official proof of
purchase.
page 4
Operation Manual
Micro-Tech Series Power Amplifiers
3 Setup
3.1 Unpack Your Amplifier
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.
CH1
19 in
48.3 cm
SIDE VIEW
3.2 Install Your Amplifier
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 (counterclockwise).
Use a standard 19-inch (48.3 cm) equipment
rack. 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.
ODEP
CH2
POWER
OFF
3.5 in
8.9 cm
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 or rear 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 4
inches (10.2 cm) from the amplifier back panel.
Figure 3.2 illustrates standard amplifier airflow.
ER
POW
P
E
OD
FF
O
2
H
C
1
H
C
WER
O
P
P
E
OD
OFF
2
H
C
1
H
C
R
E
W
O
P
P
E
D
O
FF
O
2
H
C
1
H
C
WER
O
P
P
E
OD
FF
O
2
H
C
1
H
C
Operation Manual
16 in
40.6 cm
Figure 3.1 Mounting Dimensions
Figure 3.2 Airflow
page 5
3 Setup
3.4 Choose Input Wire and Connectors
Crown recommends using pre-built or professionally wired, balanced line (two-conductor
plus shield), 22-24 gauge cables and connectors. Depending upon which amplifier input you
choose, you should use either 3-pin male XLR
connectors, TRS phone connectors, or terminal
forks at the amplifier inputs.
Unbalanced lines may also be used but may
result in noise over long cable runs.
The amplifier input connectors not used for
audio signal input may be used to daisy-chain
the audio signal to other components.
Figure 3.3 shows connector pin assignments for
balanced wiring, and Figure 3.4 shows connector pin assignments for unbalanced wiring
NOTE: Custom wiring should only be
performed by qualified personnel.
Figure 3.3 Balanced Input
Connector Wiring
Micro-Tech Series Power Amplifiers
Figure 3.4 Unbalanced Input
Connector Wiring
page 6
Operation Manual
Micro-Tech Series Power Amplifiers
3 Setup
3.5 Choose Output Wire and Connectors
Crown recommends using pre-built or professionally wired, high-quality, two-conductor,
heavy gauge speaker wire and connectors. Use
banana plugs, spade lugs or bare wire for your
output connectors (Figure 3.5). To prevent short
circuits, wrap or otherwise insulate exposed
loudspeaker cable connectors.
Using the guidelines below, select the appropriate size of wire based on the distance from
amplifier to speaker.
Distance Wire Size
up to 25 ft. 16 gauge
26-40 ft. 14 gauge 41-60 ft. 12 gauge
61-100 ft. 10 gauge 101-150 ft. 8 gauge 151-250 ft. 6 gauge
Figure 3.5 Output Connections
Operation Manual
CAUTION: Never use shielded cable for
output wiring.
page 7
3 Setup
Micro-Tech Series Power Amplifiers
3.6 Wire Your System
3.6.1 Stereo Mode
Typical input and output wiring is shown in
Figure 3.6. Turn off the amplifier, and set the
Stereo/Mono mode switch on the back to Stereo.
INPUTS: Connect input wiring for both channels.
OUTPUTS: Maintain proper polarity (+/-) on out-
put connectors.
Connect Channel 1 positive (+) speaker load to
Channel 1 positive terminal of amp; repeat for
negative (-). Repeat Channel 2 wiring as for
Channel 1.
3.6.2 Bridge-Mono Mode
Typical input and output wiring is shown in
Figure 3.6. Turn off the amplifier, and set the
Stereo/Mono mode switch on the back to Bridge
Mono.
INPUTS: Connect input wiring to Channel 1
only.
OUTPUTS: Connect the speaker across the positive (red) terminals of each channel. Do not use
the negative terminals when the amp is being
operated in Bridge-Mono mode. The load must
be balanced so neither lead is connected to
ground.
CAUTION: Connect only balanced equipment (meters, switches, etc.) to the
Bridge-Mono output. Both sides of the
line must be isolated from the input
grounds or oscillations may occur.
NOTE: To prevent distortion and low levels, the Channel 2 level control should be
set fully counter-clockwise when operating the amplifier in Bridge-Mono mode.
NOTE: Crown provides a reference of wiring pin
assignments for commonly used connector
types in the Crown Amplifier Application Guide
(Section 1.21.) available at www.crownaudio.
3.6.3 Parallel-Mono Mode
Typical input and output wiring is shown in
Figure 3.6. Turn off the amplifier, and set the Stereo/Mono mode switch on the back to Parallel
Mono. Turn down the Channel 2 level control.
INPUTS: Connect input wiring to Channel 1
only.
OUTPUTS: Connect positive (+) speaker load to
amplifier Channel 1 red (+) binding post. Connect negative (-) speaker load to amplifier Channel 1 black (-) binding post. Add a 14 gauge (or
larger) jumper wire between the red (+) binding
posts of both channels 1 and 2.
CAUTION: When the amplifier is wired for
Parallel-Mono mode, do not change the
rear switch to Stereo or Bridge-Mono.
Doing that will result in inefficient operation, high distortion and excessive heating.
NOTE: Crown provides a reference of wiring pin
assignments for commonly used connector
types in the Crown Amplifier Application Guide
(Section 1.21.) available at www.crownaudio.
page 8
Figure 3.6 Three System Connection Methods
Operation Manual
Micro-Tech Series Power Amplifiers
3 Setup
SENSITIVITY SWITCH INSIDE ACCESS HOLE
1.4 V
26 dB
THIS AMPLIFIER IS EQUIPPED WITH SELECTABLE INPUT SENSITIVITY. REMOVE COVER PLATE (ABOVE) TO ACCESS SENSITIVITY SWITCH.
BALANCED
INPUT WIRING
+
TIP
RING
–
SLEEVE
GND
CH-2
567
4
8
3
9
2
10
1
11
0
12
GAIN
0.77 V
INPUT
INPUT GROUND LIFT
LIFT
(AFFECTS PHONE INPUTS ONLY.)
INPUT
(MONO)
CH-1
567
4
3
2
1
0
GAIN
GROUND LIFT SWITCH
Figure 3.7 Input Sensitiviy and Ground Lift Switches
3.7 Set Input Sensitivity
The three-position input sensitivity switch is
located inside the amplifier behind the MT-XLR
module (Figure 4.2 letter “I”). The switch is set
at the factory to a sensitivity of 0.775 volt for
standard 1 kHz power into 8 ohms. (Factory
setting for International versions is 1.4 V.) If
desired, the sensitivity can be switched to 1.4
volts for standard 1 kHz power into 8 ohms, or
a voltage gain of 26 dB. The 26 dB gain setting
is equivalent to a sensitivity of 2.1 volts for the
Micro-Tech 600, 2.5 volts for the Micro-Tech
1200 and 3.2 volts for the Micro-Tech 2400.
8
9
10
UNBALANCED
INPUT WIRING
11
12
+
TIP
SLEEVE
GND
To change the input sensitivity:
1. Remove the back panel cover plate (or
input connector accessory).
2. Locate the access hole for the sensitivity
switch inside the chassis opening (Figure
3.7). The sensitivity switch will not be visible because it is mounted below the hole.
Use your little finger to reach it.
3. Set the switch to the desired position
noted on the label beside the access hole.
4. Replace the back panel cover plate (or
input connector accessory).
3.8 Set Ground Lift Switch
The ground lift switch (Figure 3.7) is located
on the back panel and can isolate the input signal grounds from the AC (chassis) ground. It
affects only the phone jack inputs and has no
effect on accessory input connectors. Sliding
the switch to the left isolates or “lifts” the
grounds by placing an impedance between the
sleeve of each phone jack and the AC ground.
The Micro-Tech 2400 has two reset switches
for its high-voltage power supplies. Refer to the
Troubleshooting Section in the unusual event
of a tripped breaker.
3.9 Connect to AC Mains
Connect your amplifier to the AC mains power
source (power outlet) with the supplied AC
power cordset.
WARNING: The third prong of the power
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. 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 specfied 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.
3.10 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.
Operation Manual
page 9
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