Crown Audio MA-24X6, MA-36X12 User Manual

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Macro-Tech Series

MA-24X6

Operation Manual

MA-36X12

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.

Note: 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: SmartAmp, Grounded Bridge and PIP are trademarks and Amcron, Crown, Macro-Tech, IOC, ODEP, IQ, IQ System, and P.I.P. are registered trademarks of Crown International. Other trademarks are the property of their respective owners.

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

125782-5 6/03

Macro-Tech MA-24X6 & 36X12 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

MA Series amplifiers require Class 2 output wiring.

MAGNETIC FIELD

CAUTION! Do not locate sensitive high-gain equipment such as preamplifiers or tape decks directly above or below the unit. Because this amplifier has a high power density, it has a strong magnetic field which can induce hum into unshielded devices that are located nearby. The field is strongest just above and below the unit.

If an equipment rack is used, we recommend locating the amplifier(s) in the bottom of the rack and the preamplifier or other sensitive equipment at the top.

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 complicance could void the user’s authority to operate the euqipment.

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna.

Increase the separation between the equipment and receiver.

Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

Consult the dealer or an experienced radio/TV technician for help.

page 2

Operation Manual

Macro-Tech MA-24X6 & 36X12 Power Amplifiers

Crown International, Inc.

DECLARATION of CONFORMITY

TCF Technical Certificate No: P4300CRI1.IWS

 

Technical Construction File Route

Issued By: Crown International, Inc.

Sue Whitfield

1718 W. Mishawaka Road

574-294-8289

Elkhart, Indiana 46517 U.S.A.

swhitfield@crownintl.com

 

 

Competent Body’s Name and Address:

European Representative's Name and Address:

Technology International (Europe) Limited

Nick Owen

41-42 Shrivenham Hundred Business Park,

19 Clos Nant Coslech

Shrivenham, Swindon, Wilts, SN6 8TZ

Pontprennau

Equipment Type: Commercial Audio Power Amplifiers

Cardiff

CF23 8ND United Kingdom

Family Name: Macro-Tech

 

Model Names: MA-24X6, MA-36X12

 

EMC Standards:

EN 55103-1:1995 Electromagnetic Compatibility - Product Family Standard for Audio, Video, Audio-Visual and Entertainment Lighting Control Apparatus for Professional Use, Part 1: Emissions

EN 55103-1:1995 Magnetic Field Emissions-Annex A @ 10 cm and 1 M

EN 61000-3-2:1995+A14:2000 Limits for Harmonic Current Emissions (equipment input current 16A per phase)

EN 61000-3-3:1995 Limitation of Voltage Fluctuations and Flicker in Low-Voltage Supply Systems Rated Current 16A

EN 55022:1992 + A1: 1995 & A2:1997 Limits and Methods of Measurement of Radio Disturbance Characteristics of ITE: Radiated, Class B Limits; Conducted, Class B

EN 55103-2:1996 Electromagnetic Compatibility - Product Family Standard for Audio, Video, Audio-Visual and Entertainment Lighting Control Apparatus for Professional Use, Part 2: Immunity

EN 61000-4-2:1995 Electrostatic Discharge Immunity (Environment E2-Criteria B, 4k V Contact, 8k V Air Discharge)

EN 61000-4-3:1996 Radiated, Radio-Frequency, Electromagnetic Immunity (Environment E2, criteria A)

EN 61000-4-4:1995 Electrical Fast Transient/Burst Immunity (Criteria B)

EN 61000-4-5:1995 Surge Immunity (Criteria B)

EN 61000-4-6:1996 Immunity to Conducted Disturbances Induced by Radio-Frequency Fields (Criteria A)

EN 61000-4-11:1994 Voltage Dips, Short Interruptions and Voltage Variation

Safety Standard:

EN 60065: 1998 Safety Requirements - Audio Video and Similar Electronic Apparatus

I certify that the product identified above conforms to the requirements of the EMC Council Directive 89/336/EEC as amended by 92/31/EEC, and the Low Voltage Directive 73/23/EES as amended by 93/68/EEC.

Signed

 

 

 

 

Larry Coburn

 

 

Title: Senior Vice President of Manufacturing

Date of Issue: March 28, 2000

 

 

Operation Manual

DUE TO LINE CURRENT HARMONICS, WE RECOMMEND THAT YOU CONTACT YOUR SUPPLY AUTHORITY BEFORE CONNECTION.

page 3

Macro-Tech MA-24X6 & 36X12 Power Amplifiers

Table of Contents

Important Safety Instructions .....................................................................................

2

4.1.4 Transformer Thermal Protection ...............................................

15

Declaration of Conformity ..........................................................................................

3

4.1.5 Circuit Breakers ........................................................................

15

1 Welcome ........................................................................

5

4.2 Circuit Designs .................................................................................

15

1.1

Features .........................................................................................................

5

4.2.1 Grounded Bridge ......................................................................

15

1.2

How to Use This Manual ................................................................................

5

4.2.2 Variable Impedance (VZ) ..........................................................

15

2 Setup .............................................................................

6

4.3.1 PIP Modules ............................................................................

16

2.1

Unpack Your Amplifier ...................................................................................

6

4.3.2 IQ-PIP-USP2 Adapter ...............................................................

16

2.2

Install Your Amplifier .....................................................................................

6

4.3.3 Input Sensitivity Switch ............................................................

16

2.3

Ensure Proper Cooling .................................................................................

6

4.3.4 Input Ground Lift Switch ..........................................................

16

2.4

Choose Input Wire and Connectors ..............................................................

7

5 Troubleshooting ..........................................................

17

2.5

Choose Output Wire and Connectors .............................................................

8

5.1 Indicators ............................................................................................

17

2.6

Wire Your System .........................................................................................

9

6 Theory of Operation .....................................................

19

2.7

Connect to AC Mains ...................................................................................

10

7 Specifications ............................................................

21

2.8

Startup Procedure ........................................................................................

10

8 AC Power Draw and Thermal Dissipation ............................

24

3 Operation .......................................................................

11

9 Service ....................................................................

26

3.1

Precautions ..................................................................................................

11

9.1 Worldwide Service ..............................................................................

26

3.2

Front Panel Controls and Indicators ............................................................

12

9.2 US and Canada Service .......................................................................

26

3.3

Back Panel Controls and Connectors ...........................................................

13

9.2.1 Service at a US or Canada Service Center................................

26

4 Advanced Features and Options ............................................

14

9.2.2 Factory Service ........................................................................

26

4.1 Protection Systems ......................................................................................

14

9.2.3 Factory Service Shipping Instructions: .....................................

26

 

4.1.1 Output Device Emulation Protection (ODEP) .......................................

14

10 Warranty ................................................................

27

 

4.1.2 IOC (Input Output Comparator) ...........................................................

14

Crown Factory Service Information Form ........................................................

29

 

4.1.3 Standby Mode ....................................................................................

14

 

 

page 4

Operation Manual

Macro-Tech MA-24X6 & 36X12 Power Amplifiers

1 Welcome

Congratulations on your purchase of a MacroTech ® dual level professional power amplifier. Your amplifier has a separate high-power and medium-power channel, making it ideal for biamplified systems. The Macro-Tech 24x6 combines one channel of a Macro-Tech 2400 with one channel of a Macro-Tech 600. The Macro-Tech 36x12 combines one channel of a Macro-Tech 3600VZ with one channel of a Macro-Tech 1200. And because each model has a separate power supply for each channel, each channel can be treated as a separate power amplifier.

Because it’s a Macro-Tech, you have the added benefit of PIP ™ compatibility for access to custom input modules and ODEP ® protection to keep the show going long after other amplifiers would fail.

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, MA-24X6 and MA-36X12 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

Crown’s Grounded Bridge™ design delivers incredible voltage swings without using stressful output transistor configurations like conventional amplifiers. The results are lower distortion and superior reliability.

Patented ODEP (Output Device Emulation Protection) circuitry compensates for overheating and overload to keep the amplifier working long after others would fail.

IOC ® (Input/Output Comparator) circuitry immediately alerts of any distortion exceeding 0.05%, providing dynamic proof of distortion-free performance.

PIP connector accepts accessories that tailor the amplifier to suit specific applications.

Very low harmonic and intermodulation distortion give the best dynamic transfer function in the industry.

High damping factor provides superior control over low frequency drivers for a clean, accurate low end.

Full protection against shorted outputs, open circuits, DC, mismatched loads, general overheating, high frequency overloads and internal faults.

Extra rugged, extruded aluminum front panel with ODEP and Signal Presence/IOC indicators for each channel, as well as an Enable indicator.

Macro-Tech 36x12: Articulated VZ power supply for Channel 1 (3600) provides the best power matching to your load.

Efficient heat sinks and forced air cooling prevent overheating and prolong component life.

Balanced inputs with three-position sensitivity switch and adjustable front panel level controls.

5-way binding post outputs provide versatile connection.

Mounts in a standard 19-inch (48.3-cm) equipment rack (units can also be stacked).

Three Year “No-Fault” Full Warranty completely protects your investment and guarantees its specifications.

1.2 How to Use This Manual

This manual provides you with the necessary information to safely and correctly setup and operate your amplifier. It does not cover every aspect of installation, setup or operation that might occur under every condition. For additional information, please consult Crown’s

Amplifier Application Guide (available online at www.crownaudio.com), Crown Tech Support, your system installer or retailer.

We strongly recommend you read all instructions, warnings and cautions contained in this manual. Also, for your protection, please send in your warranty registration card today. And save your bill of sale—it’s your official proof of purchase.

Operation Manual

page 5

Crown Audio MA-24X6, MA-36X12 User Manual

Macro-Tech MA-24X6 & 36X12 Power Amplifiers

2 Setup

2.1 Unpack Your Amplifier

2.2 Install Your Amplifier

Please unpack and inspect your amplifier for any damage that may have occurred during transit. If damage is found, notify the transportation company immediately. Only you can initiate a claim for shipping damage. Crown will be happy to help as needed. Save the shipping carton as evidence of damage for the shipper’s inspection.

We also recommend that you save all packing materials so you will have them if you ever need to transport the unit. Never ship the unit without the factory pack.YOU WILL NEED (not supplied):

Input wiring cables

Output wiring cables

Rack for mounting amplifier (or a stable surface for stacking)

WARNING: Before you start to set up your amplifier, make sure you read and observe the Important Safety Instructions found at the beginning of this manual.

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 2.1 for amplifier dimensions.

You may also stack amps without using a cabinet.

NOTE: When transporting, amplifiers should be supported at both front and back.

3.5 in

8.9 cm

19 in

48.3 cm

SIDE VIEW

16 in

2.5 in

40.6 cm

6.35 cm

Figure 2.1 Dimensions

2.3 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 2.2 illustrates standard amplifier airflow.

Figure 2.2 Airflow

page 6

Operation Manual

Macro-Tech MA-24X6 & 36X12 Power Amplifiers

2 Setup

2.4 Choose Input Wire and Connectors

Figure 2.3 shows connector pin assignments for balanced wiring, and Figure 2.4 shows connector pin assignments for unbalanced wiring.

NOTE: Custom wiring should only be performed by qualified personnel.

Balanced Line

Figure 2.3 Balanced Input

Connector Wiring

Unbalanced Line

Figure 2.4 Unbalanced Input

Connector Wiring

Operation Manual

page 7

Macro-Tech MA-24X6 & 36X12 Power Amplifiers

2 Setup

2.5 Choose Output Wire and Connectors

Crown recommends using pre-built or professionally wired, high-quality, two-conductor, heavy gauge speaker wire and connectors. You may use banana connectors, terminal forks or bare wire for your output connectors (see Figure 2.5). To prevent the possibility of short-circuits, wrap or otherwise insulate exposed loudspeaker cable connectors.

Note: Binding post outputs on European models come with safety plugs installed to prevent European power-cord plugs from being inserted. The side entry positions for these connectors should therefore be used on European models.

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 AWG

26-40 ft.

14 AWG

41-60 ft.

12 AWG

61-100 ft.

10 AWG

101-150 ft.

8 AWG

151-250 ft.

6 AWG

CAUTION: Never use shielded cable for output wiring.

OUTPUTS

CH-2 CH-1

Figure 2.5 Output Connector Wiring

page 8

Operation Manual

Macro-Tech MA-24X6 & 36X12 Power Amplifiers

2Setup

2.6Wire Your System

This section describes the most common way to install the Macro-Tech 24X6 and 36X12. Each model is designed for biamplified systems and includes both a high-power and a mediumpower channel.

Because each channel produces a different power level, the Macro-Tech 24x6 and 36x12 are dedicated to two-channel operation. They do NOT offer mono operation.

WARNING: Never strap the outputs together for Parallel-Mono operation! Never bridge the outputs for Bridge-Mono operation!

Installation of the Macro-Tech 24x6 and 36x12 is very intuitive. The Channel 1 input feeds the Channel 1 output and the Channel 2 input feeds the Channel 2 output. Be sure to connect the output wiring as shown in Figure 2.6.

Five-way binding posts are provided to facilitate easy connection of loudspeakers to each channel. Note: Because of its higher output power, Channel 1 of a Macro-Tech 36x12 has an additional set of binding posts.

Observe correct loudspeaker polarity and be very careful not to short the outputs of one channel to the outputs of the other channel.

NOTE: Crown provides a reference of wiring pin assignments for commonly used connector types in the Crown Amplifier Application Guide available at www.crownaudio.com.

Figure 2.6 System Wiring (a Macro-Tech 36x12 is shown)

Operation Manual

page 9

Macro-Tech MA-24X6 & 36X12 Power Amplifiers

2 Setup

2.7 Connect to AC Mains

Connect the AC power cordset of your amplifier to the AC mains power source (power outlet).

NOTE: The third prong of this connector (ground) is an important safety feature. Do not attempt to disable this ground connection by using an adapter or other methods.

Amplifiers don’t create energy. The AC mains voltage and current must be sufficient to deliver the power you expect. 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.

2.8 Startup Procedure

Use the following procedure when first turning on your amplifier:

1.Turn down the level of your audio source.

2.Turn down the level controls of the amplifier.

3.Turn on the “Enable” switch. The Enable 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 turn off the amplifier and 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.

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Operation Manual

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