Micro-Tech Series
Operation Manual |
Micro-Tech |
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600, 1200, & 2400 |
Micro-Tech
601, 1201, & 2401
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 occurred. To obtain the latest version of this manual, please visit the Crown website at www.crownaudio.com.
Trademark Notice: Crown, Amcron, Crown Audio 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.®
©2004 by Crown Audio®, Inc. P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 574-294-8000
102990-8 06/04
Micro-Tech Series Power Amplifiers
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.
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. |
DECLARATION of CONFORMITY |
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Issued By: Crown International, Inc. |
Sue Whitfield |
1718 W. Mishawaka Road |
574-294-8289 |
Elkhart, Indiana 46517 U.S.A. |
swhitfield@crownintl.com |
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European Representative’s Name and Address: |
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Nick Owen |
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19 Clos Nant Coslech |
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Pontprennau |
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Cardiff |
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CF23 8ND United Kingdom |
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Equipment Type: Commercial Audio Power Amplifiers |
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Family Name: Micro-Tech Amplifiers |
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Model Names: Micro-Tech 600, 1200, 2400, 601, 1201, 2401 |
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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
Date of Issue: January 1, 2001
Larry Colburn |
Title: Senior Vice President of Manufacturing |
Operation Manual |
Due to line current harmonics, we recommend that you contact your supply authority before connection. |
page 3 |
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Micro-Tech Series Power Amplifiers
Table of Contents
Important Safety Instructions .................................. |
2 |
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Declaration of Conformity ....................................... |
3 |
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1 Welcome ...................................... |
5 |
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1.1 Features ...................................................... |
5 |
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1.2 Unpacking Your Amplifier ........................... |
5 |
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2 How to Use This Manual .................... |
5 |
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3 Setup ........................................... |
6 |
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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 |
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3.6.1 Stereo Mode ..................................... |
9 |
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3.6.2 Bridge-Mono Mode .......................... |
9 |
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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 |
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4 Operation ..................................... |
11 |
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4.1 Precautions ................................................ |
11 |
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4.2 Controls, Indicators and Connectors .......... |
12 |
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4.2.1 Front Panel Facilities ......................... |
12 |
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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® protection to 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.
•Patented ODEP® (Output Device Emulation 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 Par- allel-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.
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 |
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.
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.
POWER
ODEP
CH1 |
CH2 |
OFF |
3.5 in |
8.9 cm
19 in
48.3 cm
SIDE VIEW
16 in
40.6 cm
Figure 3.1 Mounting Dimensions
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.
Figure 3.2 Airflow
page 6 |
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 |
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result in noise over long cable runs. |
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The amplifier input connectors not used for |
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audio signal input may be used to daisy-chain |
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the audio signal to other components. |
Figure 3.3 Balanced Input |
Figure 3.4 Unbalanced Input |
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Figure 3.3 shows connector pin assignments for |
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Connector Wiring |
Connector Wiring |
balanced wiring, and Figure 3.4 shows connector pin assignments for unbalanced wiring
NOTE: Custom wiring should only be performed by qualified personnel.
Operation Manual |
page 7 |
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 |
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up to 25 ft. |
16 gauge |
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26-40 ft. |
14 gauge |
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41-60 ft. |
12 gauge |
Figure 3.5 Output Connections |
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61-100 ft. |
10 gauge |
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101-150 ft. |
8 gauge |
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151-250 ft. |
6 gauge |
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CAUTION: Never use shielded cable for output wiring.
page 8 |
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 output 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.
Figure 3.6 Three System Connection Methods
Operation Manual |
page 9 |
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