Crown Micro-Tech 1200, Micro-Tech 1201, Micro-Tech 2400, Micro-Tech 2401, Micro-Tech 600 Owners 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:
trademark of Crown International. Other trademarks are the property of their respective owners.
Crown, Amcron, Crown Audio and ODEP are registered trademarks of Crown International. Grounded Bridge is a
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.
©2004 by Crown Audio®, Inc. P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 574-294-8000
®
102990-8
06/04
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.
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.
Micro-Tech Series Power Amplifiers
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 operation
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
Micro-Tech Series 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
19 Clos Nant Coslech
Pontprennau
Cardiff
CF23 8ND United Kingdom
Equipment Type: Commercial Audio Power Amplifiers
Family Name: Micro-Tech Amplifiers
Model Names: Micro-Tech 600, 1200, 2400, 601, 1201, 2401
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
DECLARATION of CONFORMITY
Sue Whitfield
574-294-8289
swhitfield@crownintl.com
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
Operation Manual
Larry Colburn
Title: Senior Vice President of Manufacturing
Due to line current harmonics, we recommend that you contact your supply authority before connection.
Date of Issue: January 1, 2001
page 3
Table of Contents
Micro-Tech Series Power Amplifiers
Important Safety Instructions ..................................2
Declaration of Conformity .......................................3
1 Welcome ...................................... 5
1.1 Features ...................................................... 5
1.2 Unpacking Your Amplifier ........................... 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 ........ 8
3.6 Wire Your System ......................................9
3.6.1 Stereo Mode .....................................9
3.6.2 Bridge-Mono Mode ..........................9
3.6.3 Parallel-Mono Mode ........................ 9
3.7 Set Input Sensitivity ................................... 10
3.8 Set Ground Lift Switch ...............................10
3.9 Connect to AC Mains ................................ 10
3.10 Startup Procedure .................................... 10
4 Operation ..................................... 11
4.1 Precautions ................................................11
4.2 Controls, Indicators and Connectors .......... 12
4.2.1 Front Panel Facilities ......................... 12
4.2.2 Rear Panel Facilites............................ 13
5 Advanced Features and Options .........................14
5.1 Protection Systems ........................................................14
5.1.1 ODEP .................................................................... 14
5.1.2 Ultrasonic and Radio Frequency Protection .......... 14
5.1.3 Drive Protection ....................................................14
5.1.4 Transformer Thermal Protection ........................... 14
5.1.5 Fuses and Circuit Breakers ................................... 14
5.2 Accessories ................................................................... 15
5.2.1 Cooling Fan Options ............................................ 15
5.2.2 Input Connectors Option ..................................... 15
5.3 Filter Cleaning ............................................................... 15
6 Principles of Operation .................................... 16
6.1 Overview ....................................................................... 16
6.2 Circuit Theory ............................................................... 16
6.2.1 Stereo Operation ................................................... 17
6.2.2 Bridge-Mono Operation ........................................ 18
6.2.3 Parallel-Mono Operation ......................................18
7 Troubleshooting ............................................ 19
8 Specifications .............................................. 20
9 AC Power Draw and Thermal Dissipation .............. 22
10 Service .................................................... 24
10.1 Worldwide Service ........................................................24
10.2 US and Canada Service ................................................ 24
10.2.1 Service at a US or Canada Service Center ..........24
10.2.2 Factory Service ................................................... 24
10.2.3 Factory Service Shipping Instructions ................ 24
11 Warranty ...................................................25
Crown Factory Service Information Form ................................... 27
page 4
Operation Manual
Micro-Tech Series Power Amplifiers
1 Welcome
The Crown® 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 package. In addition, each model gives you Crown's
legendary ODEP
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 keep the show
®
• 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.
Operation Manual
page 5
3 Setup
Micro-Tech Series Power Amplifiers
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
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 four
inches (10.2 cm) from the amplifier back panel.
Figure 3.2 illustrates standard amplifier airflow.
page 6
SIDE VIEW
16 in
40.6 cm
Figure 3.1 Mounting Dimensions
Figure 3.2 Airflow
Operation Manual
Micro-Tech Series Power Amplifiers
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
Figure 3.4 Unbalanced Input
Connector Wiring
Operation Manual
page 7
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
Micro-Tech Series Power Amplifiers
Figure 3.5 Output Connections
page 8
CAUTION: Never use shielded cable for
output wiring.
Operation Manual
Micro-Tech Series Power Amplifiers
3 Setup
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.com.
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.
Operation Manual
Figure 3.6 Three System Connection Methods
page 9
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