Crown MA-1200, MA-1201, MA-2400, MA-2401, MA-601 Brochure

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Crown MA-1200, MA-1201, MA-2400, MA-2401, MA-601 Brochure

Models:

Macro-Tech 600, 1200 & 2400

Macro-Tech 601, 1201 & 2401

Some models may be exported under the name Amcron®.

©2003 by Crown Audiol, Inc., P.O. Box 1000, Elkhart, IN 46515-1000 U.S.A. Telephone: 574-294-8000. Fax: 574-294-8329. Trademark Notice: SmartAmp, PIP and Grounded Bridge are trademarks and Amcron, Crown, Macro-Tech, IOC, ODEP, IQ System, and P.I.P. are registered trademarks of Crown International, Inc. Other trademarks are the property of their respective owners.

Approved for

THX Theatre

Systems

130252-1A 3/03

3 YEAR

THREE YEAR

FULL WARRANTY

3 YEAR

WORLDWIDE

NORTH AMERICA

SUMMARY OF WARRANTY

The Crown Audio Division of Crown International, Inc., 1718 West Mishawaka Road, Elkhart, Indiana 46517-4095 U.S.A. warrants to you, the ORIGINAL PURCHASER and ANY SUBSEQUENT OWNER of each NEW Crown1 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, and we further warrant the new Crown product regardless of the reason for failure, except as excluded in 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

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 intentional 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.

WHAT THE WARRANTOR WILL DO

We will remedy any defect, regardless of the reason for failure (except as excluded), by repair, replacement, or refund. We may not elect refund unless you agree, or unless we are unable to provide 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 interest, insurance, closing costs, and other finance charges less a reasonable depreciation on the product from the date of original purchase. Warranty work can only be performed at our authorized service centers. We will remedy the defect and ship the product from the service center within a reasonable time after receipt of the

defective product at our authorized service center.

HOW TO OBTAIN WARRANTY SERVICE

You must notify us of your need for warranty service not later than ninety (90) days after expiration of the warranty period. All components must be shipped in a factory pack. 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 center are not satisfactory, notify our authorized service center immediately.

DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES

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.

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 later than ninety (90) days after expiration of the warranty period.

THIS STATEMENT OF WARRANTY SUPERSEDES ANY OTHERS CONTAINED IN THIS MANUAL FOR CROWN PRODUCTS.

9/90

Telephone: 219-294-8200. Facsimile: 219-294-8301

SUMMARY OF WARRANTY

The Crown Audio Division of Crown International, Inc., 1718 West Mishawaka Road, Elkhart, Indiana 46517-4095 U.S.A. warrants to you, the ORIGINAL PURCHASER and ANY SUBSEQUENT 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 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 intentional 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.

WHAT THE WARRANTOR WILL DO

We will remedy any defect, regardless of the reason for failure (except as excluded), by repair, replacement, or refund. We may not elect refund unless you agree, or unless we are unable to provide 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 interest, insurance, closing costs, and other finance charges less a reasonable depreciation on the product from the date of original purchase. Warranty work can only be performed at our authorized service centers or at the 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 defective 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 foreign country and the port of entry in the United States and all taxes, duties, and other customs fees for such foreign shipments.)

HOW TO OBTAIN WARRANTY SERVICE

You must notify us of your need for warranty service not later than ninety (90) days after expiration of 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 reasonable 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 authorized service center immediately.

DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES

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. SOME STATES DO NOT

ALLOW THE EXCLUSION OR LIMITATIONS OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.

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.

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

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 later than ninety (90) days after expiration of the warranty period.

THIS STATEMENT OF WARRANTY SUPERSEDES ANY OTHERS CONTAINED IN THIS MANUAL FOR CROWN PRODUCTS.

Telephone: 219-294-8200. Facsimile: 219-294-8301

9/90

The information furnished in 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. If your unit bears the name “Amcron,” please substitute it for the name “Crown” in this manual. If you need special assistance beyond the scope of this manual, please contact our Technical Support Group.

Crown Technical Support Group

1718 W. Mishawaka Rd., Elkhart, Indiana 46517 U.S.A.

Phone: 800-342-6939 (North America, Puerto Rico and Virgin Islands) or 574-294-8200 Fax: 574-294-8301 Fax Back (North America only): 800-294-4094 or 574-293-9200 Fax Back (International): 574-294-8100 Internet: http://www.crownaudio.com

IMPORTANT

THE MACRO-TECH 2400 REQUIRES CLASS 1 OUTPUT WIRING. THE MACRO-TECH 600 & 1200 REQUIRE CLASS 2 OUTPUT WIRING.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C A U T I O N

 

 

A V I S

 

 

 

 

RISK OF ELECTRIC SHOCK

 

 

RISQUE DE CHOC ÉLECTRIQUE

 

 

 

 

DO NOT OPEN

 

 

N’OUVREZ PAS

 

 

 

TO PREVENT ELECTRIC SHOCK DO

À PRÉVENIR LE CHOC ÉLECTRIQUE

 

 

NOT REMOVE TOP OR BOTTOM

N’ENLEVEZ PAS LES COUVERCLES.

 

 

COVERS. NO USER SERVICEABLE

IL N’Y A PAS DES PARTIES

 

 

PARTS INSIDE. REFER SERVICING

SERVICEABLE À L’INTÉRIEUR. TOUS

 

 

TO QUALIFIED SERVICE PERSON-

REPARATIONS DOIT ETRE FAIRE PAR

 

 

NEL. DISCONNECT POWER CORD

PERSONNEL QUALIFIÉ SEULMENT.

 

 

BEFORE REMOVING REAR INPUT

DÉBRANCHER LA BORNE AVANT

 

 

MODULE TO ACCESS GAIN SWITCH.

D’OUVRIR LA MODULE EN ARRIÈRE.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WARNING

TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE!

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.

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.

Printed on recycled paper.

Macro-Tech 600/1200/2400 Power Amplifiers

CONTENTS

1

Welcome ............................................................................

 

7

 

1.1

Unpacking ...................................................................

7

 

1.2

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

7

2

Controls, Indicators & Connectors ...................................

8

3

Installation .......................................................................

10

 

3.1

Mounting ...................................................................

10

 

3.2

Cooling ......................................................................

10

 

3.3

Wiring

........................................................................

11

 

 

3.3.1

Stereo (Two-Channel) Operation ......................

11

 

 

3.3.2

Bridge-Mono Operation ...................................

12

 

 

3.3.3

Parallel-Mono Operation ..................................

13

 

 

3.3.4

Input Connection .............................................

14

 

 

3.3.5

Output Connection ..........................................

16

 

 

3.3.6

Additional Load Protection ..............................

18

 

3.4

AC Power Requirements ............................................

18

4

Operation .........................................................................

 

19

 

4.1

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

19

 

4.2

Indicators ..................................................................

19

 

4.3

Protection Systems ....................................................

21

 

 

4.3.1

ODEP ..............................................................

21

 

 

4.3.2

Standby Mode .................................................

21

 

 

4.3.3

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

21

 

 

4.3.4 Fuses and Circuit Breakers ..............................

22

 

4.4

Controls .....................................................................

22

 

4.5

Filter Cleaning ............................................................

23

5

Technical Information .....................................................

24

 

5.1

Overview ...................................................................

24

 

5.2

Circuit Theory ............................................................

24

 

 

5.2.1

Stereo Operation .............................................

24

 

 

5.2.2

Bridge-Mono Operation ...................................

26

 

 

5.2.3

Parallel-Mono Operation ..................................

26

6

Specifications ..................................................................

27

7

AC Power Draw & Thermal Dissipation ..........................

36

8

Accessories .....................................................................

38

 

8.1

PIP Modules ..............................................................

38

 

8.2

Cooling Fan Options ..................................................

40

 

8.3

Level Control Security Kit ...........................................

40

9

Service .............................................................................

 

41

 

9.1

Worldwide Service .....................................................

41

 

9.2

North American Service .............................................

41

 

 

9.2.1 Service at a N. American Service Center .........

41

 

 

9.2.2

Factory Service ...............................................

41

Page 4

Reference Manual

Macro-Tech 600/1200/2400 Power Amplifiers

 

ILLUSTRATIONS

 

1.1

Macro-Tech Amplifier ................................................................

7

2.1

Front Panel Controls & Indicators ..............................................

8

2.2

Rear Panel Controls & Connectors ............................................

9

3.1

Mounting Dimensions .............................................................

10

3.2

Top View of a Rack-Mounted Unit ............................................

10

3.3

Proper Air Flow in a Rack Cabinet ...........................................

10

3.4

Stereo Wiring ..........................................................................

11

3.5

Bridge-Mono Wiring ................................................................

12

3.6

Parallel-Mono Wiring ...............................................................

13

3.7

Unbalanced Input Wiring ........................................................

14

3.8

Balanced Input Wiring .............................................................

14

3.9

Balanced and Unbalanced Phone Plugs .................................

14

3.10

Infrasonic Filter Capacitors ......................................................

15

3.11

Unbalanced RFI Filters ............................................................

15

3.12

Balanced RFI Filters ................................................................

15

3.13

Wire Size Nomograph .............................................................

16

3.14

Inductive Load (Transformer) Network.....................................

17

3.15

Loudspeaker Fuse Nomograph ..............................................

18

4.1

Indicators ................................................................................

19

4.2

Macro-Tech ODEP and Signal/IOC Indicator States.................

20

4.3

Input Sensitivity and Ground Lift Switches ...............................

22

5.1

Circuit Block Diagram .............................................................

25

6.1

Macro-Tech 600 Minimum Power Matrix ..................................

29

6.2

Macro-Tech 1200 Minimum Power Matrix ................................

30

6.3

Macro-Tech 2400 Minimum Power Matrix ................................

30

6.4

Macro-Tech 600 Maximum Power Matrix .................................

31

6.5

Macro-Tech 1200 Maximum Power Matrix ...............................

32

6.6

Macro-Tech 2400 Maximum Power Matrix ...............................

32

6.7

Typical Frequency Response ..................................................

33

6.8

Typical Damping Factor ..........................................................

33

6.9

Typical Output Impedance ......................................................

33

6.10

Typical Phase Response .........................................................

34

6.11

Typical Crosstalk for the Macro-Tech 600 ................................

34

6.12

Typical Crosstalk for the Macro-Tech 1200 ..............................

35

6.13

Typical Crosstalk for the Macro-Tech 2400 ..............................

35

7.1Macro-Tech 600 Power Draw, Current Draw and

Thermal Dissipation at Various Duty Cycles .............................

36

7.2Macro-Tech 1200 Power Draw, Current Draw and

Thermal Dissipation at Various Duty Cycles .............................

37

7.3Macro-Tech 2400 Power Draw, Current Draw and

 

Thermal Dissipation at Various Duty Cycles .............................

37

8.1

Installing a PIP Module ............................................................

38

8.2

Installing a Level Control Shaft Lock ........................................

40

Reference Manual

Page 5

Macro-Tech 600/1200/2400 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 damp cloth.

7)Do not block any of the 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. When 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, tripod, 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 tipover.

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 power-supply 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.

Page 6

Reference Manual

Macro-Tech 600/1200/2400 Power Amplifiers

Fig. 1.1 Macro-Tech Amplifier

1 Welcome

Congratulations on your purchase of the renowned

Here are some of their many features:

Macro-Tech® professional power amplifier. Macro-Tech

Crown’s Grounded Bridgedesign delivers large voltage

amplifiers are designed to provide enormous levels of

 

swings without using easily stressed outputtransistor

pure, undistorted power in a rugged low-profile pack-

 

 

configurations like conventional amplifiers. The results are

age—making them the choice for pro sound reinforce-

 

lower distortion and superior reliability.

ment. They utilize our patented ODEP® protection

 

Patented ODEP (Output Device Emulation Protection) cir-

circuitry to keep the show going long after other ampli-

 

cuitry compensates for overheating and overload to keep

fiers have shut down. And with their PIP expandability,

 

the amplifier working when others would fail.

Macro-Tech amplifiers can be easily customized with

 

IOC® (Input/Output Comparator) circuitry immediately

one of our many optional input modules (see Section 8

 

alerts of any distortion exceeding 0.05%, providing dy-

for a list of available PIPs).

 

namic proof of distortion-free performance.

This manual will help you successfully install and use

 

PIP (Programmable Input Processor) connector accepts

your new amplifier. Please read all instructions, warn-

 

accessories that tailor the amplifier to suit specific appli-

 

cations.

ings and cautions. Be sure to read Sections 3.3.2 and

 

 

Two mono modes (Bridge-Mono and Parallel-Mono) for

3.3.3 if you plan to use one of the amplifier’s two mono

 

driving a wide range of load impedances.

modes. Also for your protection, please send in your

 

 

Very low harmonic and intermodulation distortion result in

warranty registration card today and save your bill of

 

sale because it is your official proof of purchase.

 

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, mismatched

1.1 Unpacking

 

loads, input/output DC, general overheating, high-fre-

 

quency overloads and internal faults.

Please unpack and inspect your new amplifier for any

 

Dedicated power supply transformers isolate channels in

damage that may have occurred during transit. If dam-

 

Stereo mode for superb crosstalk characteristics and reli-

age is found, notify the transportation company imme-

 

ability—each channel is virtually a separate amplifier.

 

 

diately. Only you, the consignee, may initiate a claim for

 

Balanced inputs with internal three-position sensitivity

shipping damage. Crown will be happy to cooperate

 

switch and adjustable front-panel level controls.

fully as needed. Save the shipping carton as evidence

 

Versatile 5-way binding posts make it easy to connect out-

of damage for the shipper’s inspection.

 

put wiring.

Even if the unit arrived in perfect condition, as most do,

Ground lift switch isolates the AC power and phone jack

 

audio grounds.

save all packing materials so you will have them if you

 

Efficient heat sinks and a self-contained forced-air cooling

ever need to transport the unit. NEVER SHIPTHE UNIT

 

system dissipate heat quickly and evenly for extra ampli-

WITHOUT THE FACTORY PACK.

 

 

fier protection and greater power output.

 

 

1.2 Features

Extra rugged, extruded aluminum front panel with ODEP

 

and signal presence/IOC indicators for each channel, and

Macro-Tech amplifiers use cutting edge technology to

 

an Enable indicator.

deliver the ultimate in power and value for their size,

 

Mounts in a standard 19-inch (48.3-cm) equipment rack

weight and price. They offer numerous advantages

 

(units can also be stacked).

over conventional designs and provide benefits you

 

Three year “No-Fault” full warranty completely protects

can’t get in amplifiers from any other manufacturer.

 

your investment and guarantees its specifications.

 

 

 

 

Reference Manual

 

Page 7

Macro-Tech 600/1200/2400 Power Amplifiers

Fig. 2.1 Front Panel Controls & Indicators

2 Controls, Indicators &

Connectors

A. Dust Filters

The dust filters remove large particles from the air drawn in by the cooling fan. Check the filters regularly to prevent clogging. The filter elements can be easily removed for cleaning by gently pulling them away from the front panel (see Sections 3.2 and 4.5).

B. Level Controls

The output level for each channel is set with these convenient level controls mounted on the front panel. Each level control has 31 detents for precise adjustment (see Section 4.4). A security option is available to prevent tampering (see Section 8.3).

C. Signal/IOC Indicators

These green multifunction indicators show signal presence and distortion for each channel. As signal presence indicators, they flash synchronously with the output audio signals to show their presence. As IOC (Input/Output Comparator) indicators, they flash brightly with a 0.1 second hold delay if there is a difference of 0.05% or more between the input and output signal waveforms. This provides proof of distortion-free performance. Another IOC function is to indicate input overload. If an input signal is too large, the indicator for the affected channel flashes brightly with a 0.5 second hold delay to show clipping distortion. Note: The Channel 2 IOC indicator stays on in Parallel-Mono mode (see Section 4.2).

D. ODEP Indicators

During normal operation of the ODEP (Output Device

Emulation Protection) circuitry, these amber indicators glow brightly to show the presence of reserve thermaldynamic energy. They dim proportionally as energy reserves decrease. In the rare event that energy reserves are depleted, the indicators turn off and ODEP proportionally limits output drive so the amplifier can safely continue operating even under severe conditions. These indicators can also help identify more unusual operating conditions (see Section 4.2).

E. Enable Indicator

This indicator lights when the amplifier has been “enabled” or turned on, and AC power is available (see Section 4.2).

F. Enable Switch

This push button is used to turn the amplifier on and off. When turned on, the output is muted for approximately four seconds to protect your system from start-up transients. (This delay can be changed. Contact Crown’s Technical Support Group for details.)

G. Power Cord

The power cord has an appropriate plug for the required voltage. 120 VAC, 60 Hz North American MacroTech 600s and 1200s have 14 AWG line cords and NEMA 5-15P plugs. Macro-Tech 2400s have 12 AWG line cords and NEMA 5-20P plugs. International units are shipped with an appropriate line cord and plug. See Section 7 for AC power usage.

H. Stereo/Mono Switch

The three operating modes of a Macro-Tech amplifier

 

 

 

 

 

 

Page 8

 

Reference Manual

Macro-Tech 600/1200/2400 Power Amplifiers

Fig. 2.2 Rear Panel Controls & Connectors

(Note: Reset Switches (Item I) only available on the Macro-Tech 2400 model.)

are controlled by this switch. Stereo mode is used for normal two-channel operation, Bridge-Mono mode is used to drive a single channel with a load impedance of at least 4 ohms, and Parallel-Mono mode is used to drive a single channel with an impedance less than 4 ohms. Important: Turn off the amplifier before changing the stereo/mono switch (see Section 3.3).

I. Reset Switches (Macro-Tech 2400 only)

The Macro-Tech 2400 has a back panel Reset switch for each channel. Each switch resets the circuit breaker that protects the channel’s power supply from overload.

J. PIP Module

The standard P.I.P.- FX is included with your amplifier. It provides female three-pin XLR input connectors. A variety of other PIP modules can be used in place of the P.I.P.-FX. They add additional features that customize the amplifier for different applications (see Section 8.1 for information on available PIP modules).

Input Sensitivity Switch (not shown)

The three-position input sensitivity switch located inside the amplifier can be set after removing the PIP module

(J). It is set at the factory to 0.775 volts for standard 1- kHz output into 8 ohms. It can also be set to 1.4 volts for standard 1-kHz output into 8 ohms, or a fixed voltage gain of 26 dB (see Section 4.4).

K. Balanced Phone Jack Inputs

Balanced ¼-inch phone jack input connectors are provided on the back panel of your amplifier. The phone jacks can be wired for either balanced (tip, ring and

sleeve) or unbalanced (tip and sleeve) input signals. Because they are electrically in parallel with the PIP input connectors, input signals should not be connected to the phone jacks when certain PIP modules are installed (see Section 3.3.4). The phone jacks can also be used as “daisy chain” outputs to simplify connecting input signals to multiple amplifiers. Caution: The

Channel 2 input should NOT be used in either Bridge Mono or Parallel Mono mode.

L. Ground Lift Switch

This switch isolates or “lifts” the phone jack signal grounds from the AC power ground. Activating the switch inserts an impedance between the sleeve of each phone jack and the unit’s AC ground to help prevent the hum that can result from a ground loop.

M. Balanced XLR Inputs

The factory-installed P.I.P.- FX provides a three-pin female XLR connector for balanced input to each channel. The XLR inputs are connected in parallel with the amplifier’s phone jack inputs. Because the P.I.P.- FX does not have any active circuitry, its XLR connectors can also be used as “daisy chain” outputs to connect signals from phone jack inputs to multiple amplifiers (see Section 3.3.4). Caution: The Channel 2 input should NOT be used in either Bridge Mono or Parallel Mono mode.

N. Output Jacks

A pair of versatile 5-way binding posts is provided for the output of each channel. The 5-way binding posts accept banana plugs, spade lugs or bare wire.

 

 

 

 

 

 

Reference Manual

 

Page 9

Macro-Tech 600/1200/2400 Power Amplifiers

3 Installation

3.1 Mounting

Macro-Tech amplifiers are designed for standard 19-inch (48.3-cm) rack mounting and “stack” mounting without a cabinet. For more efficient cooling and extra support in a rack, it is recommended that units be stacked directly on top of each other.

Important: If the unit will be transported, it should also be securely supported at the back of the rack.

 

LEVEL

 

 

 

 

LEVEL

 

 

 

12

15

18

ODEP

 

12

15

18

 

 

9

 

21

 

9

 

21

 

 

 

 

 

 

 

 

 

 

 

ON

6

 

24

SIGNAL / IOC

 

6

 

24

 

OFF

0

 

30

CH2

0

 

30

ENABLE

 

CH1

 

3.5 in

3

 

27

 

 

3

 

27

 

 

 

 

 

 

 

 

 

 

 

8.9 cm

19 in

48.3 cm

SIDE VIEW

16 in

2.5 in

40.6 cm

6.35 cm

Fig. 3.1 Mounting Dimensions

3.2 Cooling

NEVER block the side or front air vents. Macro-Tech amplifiers do not need to be mounted with space between them. If you must leave open spaces in a rack for any reason, close them with blank panels to prevent air from recycling into the front of other amplifiers. Allow at least 35 cubic feet (1 cubic meter) per minute per unit for the Macro-Tech 600 and 1200, and at least 45 cubic feet (1.3 cubic meters) per minute per unit for the Macro-Tech 2400. Additional air flow may be required when driving low impedance loads at consistently high output levels. Refer to Section 7 for detailed information on thermal dissipation.

17 in

43.2 cm

IMPORTANT: Be sure rear of amplifier is securely mounted to rack.

AIR

AIR

FLOW

FLOW

16 in

40.6 cm AMPLIFIER (TOP VIEW)

2 in (5 cm)

MIN.

RACK

CABINET

AIR FLOW

Fig. 3.2 Top View of a Rack-Mounted Unit

When mounting the amplifier in a rack, the side walls of the rack should be at least 2 inches (5 cm) away from the chassis as shown in Figure 3.2.

Tip: An easy way to verify adequate cooling is to observe the ODEP indicators while the amplifier is operating under worst-case conditions. If the indicators dim, additional cooling is recommended.

If your rack has a front door that could block air flow to the amplifier’s air intakes, you must provide adequate air flow by installing a grille in the door or by pressurizing the air behind the door. Wire grilles are recommended over perforated panels because they tend to cause less air restriction. A good choice for pressurizing the air behind a rack cabinet door is to mount a “squirrel cage” blower inside the rack (Option 1 below). At the bottom of the rack, mount the blower so it blows outside air into the space between the door and in front of the amplifiers, pressurizing the “chimney” behind the door. This blower should not blow air into or take air out of the space behind the amplifiers. For racks without a door, you can evacuate the rack by mounting the blower at the top of the rack so that air inside the cabinet is drawn out the back (Option 2 below).

AIR

BLOWER

FRONT

OF

FLOW

(OPTION 2)

RACK

 

 

DOOR

EQUIPMENT

RACK

(SIDE VIEW)

AIR

BLOWER

FLOW

(OPTION 1)

Fig. 3.3 Proper Air Flow in a Rack Cabinet

If the air supply is unusually dusty, you might want to pre-filter it using commercial furnace filters to prevent rapid loading of the unit’s own air filter. When needed, the unit’s filter can be cleaned with mild dish detergent and water (see Section 4.5).

Page 10

Reference Manual

Macro-Tech 600/1200/2400 Power Amplifiers

3.3 Wiring

This section describes the most common ways to install your amplifier in a sound system. The input and output terminals are located on the back panel. Please use care when making connections, selecting signal sources and controlling the output level. The load you save may be your own! Crown assumes no liability for damaged loads resulting from careless amplifier use or deliberate overpowering.

CAUTION: Always remove power from the unit and turn the level controls off while making or changing connections. This is very important when loudspeakers are connected because it reduces the chance of loud blasts that can cause loudspeaker damage.

Macro-Tech amplifiers may be operated in one of three modes (Stereo, Bridge-Mono, and Parallel-Mono) by switching the stereo/mono switch on the back panel. There are VERY IMPORTANT wiring differences among these three modes which will be discussed next.

3.3.1 Stereo (Two-Channel) Operation

In Stereo mode, installation is very intuitive: input Channel 1 feeds output Channel 1, and input Channel 2 feeds output Channel 2. To put the amplifier in Stereo mode, first turn off the amplifier, then slide the stereo/ mono switch to the center position, and properly connect the output wiring as shown in Figure 3.4. A pair of 5-way binding posts is provided for each channel to facilitate easy connection of loudspeaker wires. Observe correct loudspeaker polarity and be very careful not to short the two outputs.

CAUTION: In Stereo mode, never parallel the two outputs by directly tying them together, and never parallel them with the output of another amplifier.

Such a connection does not result in increased power output, but may result in overheating and premature activation of the protection circuitry.

Note: A method for paralleling multiple amplifiers for fail-safe redundancy is available from Crown’s Technical Support Group.

Fig. 3.4 Stereo Wiring

Reference Manual

Page 11

Macro-Tech 600/1200/2400 Power Amplifiers

3.3.2 Bridge-Mono Operation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bridge-Mono mode is intended for driving loads with a

 

 

 

not defeated in Bridge-Mono mode. Any signal fed into

total impedance of 4 ohms or more (If the load is less

 

 

Channel 2 will work against and add to or distort the

than 4 ohms, see Section 3.3.3). Installing the amplifier

 

 

signal in Channel 1.

in Bridge-Mono mode is very different from the other

 

 

Connect the load across the Channel 1 and 2 red bind-

modes and requires special attention.

 

 

 

 

ing posts with the positive lead from the load attaching

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

To put the amplifier in Bridge-Mono mode, turn the am-

 

 

to the red post of Channel 1 and the negative lead of

plifier off and slide the stereo/mono switch to the right

 

 

the load attaching to the red post of Channel 2 as shown

(as you face the back of the amplifier). Both outputs

 

 

in Figure 3.5. THE TWO BLACK BINDING POSTS ARE

receive the signal from Channel 1 with the output of

 

 

NOT USED AND SHOULD NOT BE SHORTED. The

Channel 2 inverted so it can be bridged with the Chan-

 

 

load must be balanced (neither side shorted to

nel 1 output. DO NOT USE THE CHANNEL 2 INPUT or

 

 

ground).

the signal level and quality may be greatly degraded.

 

 

CAUTION: Be certain all equipment (meters,

Keep the Channel 2 level control turned down com-

 

 

 

 

switches, etc.) connected to the mono output is bal-

pletely (counterclockwise).

 

 

 

 

anced.To prevent oscillations, both sides of the line

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note: The input jack and level control of Channel 2 are

 

 

must be isolated from the input grounds.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig. 3.5 Bridge-Mono Wiring

Page 12

Reference Manual

Macro-Tech 600/1200/2400 Power Amplifiers

3.3.3 Parallel-Mono Operation

Parallel-Mono mode is intended for driving loads with a net impedance of less than 4 ohms. (See Bridge-Mono if the load is 4 ohms or greater.) Installing the amp in Parallel-Mono mode is very different from the other modes and requires special attention.

CAUTION: Do not attempt to operate in Stereo or Bridge-Mono mode until the Parallel-Mono jumper is first removed. Failure to do so will result in high distortion and excessive heating.

To put the amplifier in Parallel-Mono mode, turn it off and slide the stereo/mono switch to the left (as you face the back panel). Connect the input signal to Channel 1 only. The Channel 2 input and level control are by-

passed in this mode, so they should not be used.

Note: It is normal for the IOC indicator of Channel 2 to remain lit in Parallel-Mono mode.

Install a jumper wire between the red binding posts of both Channel 1 and 2 that is at least 14 gauge in size. Then, connect the load to the output of Channel 1 as shown in Figure 3.6. The positive lead from the load connects to the red binding post of Channel 1 and the negative lead from the load connects to the black binding post of Channel 1.

CAUTION: Remove the jumper wire before changing to Stereo or Bridge-Mono mode.

Fig. 3.6 Parallel-Mono Wiring

Reference Manual

Page 13

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