Crown Macro-Tech MA-24X6 Operation Manual
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Crown Macro-Tech MA-24X6 Operation Manual

Crown macro-tech dual level professional power amplifier operation manual ma-24x6 ma36x12 macro-tech series
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Operation Manual

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 Sys-
tem, and P.I.P. are registered trademarks of Crown International. Other trademarks are the property of their respective owners.
Macro-Tech Series
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
MA-24X6
MA-36X12
®
125782-5
6/03

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Summary of Contents for Crown Macro-Tech MA-24X6

  • Page 1: Operation Manual

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

  • Page 2: Important Safety Instructions

    The exclamation point triangle is used to alert the user to important operating or maintenance instruc- tions. Macro-Tech MA-24X6 & 36X12 Power Amplifiers FCC COMPLIANCE NOTICE This device complies with part 15 of the FCC rules. Operation is subject to the following...

  • Page 3: Declaration Of Conformity

    Macro-Tech MA-24X6 & 36X12 Power Amplifiers Crown International, Inc. Issued By: Crown International, Inc. 1718 W. Mishawaka Road Elkhart, Indiana 46517 U.S.A. Competent Body’s Name and Address: Technology International (Europe) Limited 41-42 Shrivenham Hundred Business Park, Shrivenham, Swindon, Wilts, SN6 8TZ...

  • Page 4: Table Of Contents

    4.1.1 Output Device Emulation Protection (ODEP) ...14 4.1.2 IOC (Input Output Comparator) ... 14 4.1.3 Standby Mode ... 14 page 4 Macro-Tech MA-24X6 & 36X12 Power Amplifiers 4.1.4 Transformer Thermal Protection ... 15 4.1.5 Circuit Breakers ... 15 4.2 Circuit Designs ... 15 4.2.1 Grounded Bridge ...

  • Page 5: Welcome

    Macro-Tech MA-24X6 & 36X12 Power Amplifiers 1 Welcome Congratulations on your purchase of a Macro- 1.1 Features ® Tech 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.

  • Page 6: Setup

    Important Safety Instruc- tions found at the beginning of this manual. page 6 Macro-Tech MA-24X6 & 36X12 Power Amplifiers 2.2 Install Your Amplifier CAUTION: Before you begin, make sure your amplifier is disconnected from the power source, with power switch in the “off”...

  • Page 7: Choose Input Wire And Connectors

    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 connec- tor pin assignments for unbalanced wiring. NOTE: Custom wiring should only be performed by qualified personnel.

  • Page 8: Choose Output Wire And Connectors

    CAUTION: Never use shielded cable for output wiring. page 8 Figure 2.5 Output Connector Wiring Wire Size 16 AWG 14 AWG 12 AWG 10 AWG 8 AWG 6 AWG Macro-Tech MA-24X6 & 36X12 Power Amplifiers OUTPUTS CH-2 CH-1 Operation Manual...

  • Page 9: Wire Your System

    Macro-Tech MA-24X6 & 36X12 Power Amplifiers 2 Setup 2.6 Wire 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 medium- power channel.

  • Page 10: Connect To Ac Mains

    If you are unsure of the output voltage of your AC mains, please consult your electrician. page 10 Macro-Tech MA-24X6 & 36X12 Power Amplifiers 2.8 Startup Procedure Use the following procedure when first turning on your amplifier: 1.

  • Page 11: Operation

    Macro-Tech MA-24X6 & 36X12 Power Amplifiers 3 Operation 3.1 Precautions Your Macro-Tech Series amplifier is protected from internal and external faults, but you should still take the following precautions for optimum performance and safety: 1. Before use, your amplifier first must be con- figured for proper operation, including input and output wiring hookup.

  • Page 12: Front Panel Controls And Indicators

    B. Level Control Rotary detented level control, one per channel. page 12 Macro-Tech MA-24X6 & 36X12 Power Amplifiers C. Signal/IOC Indicator Green LED, one per channel. Dual-pur- pose indicator illuminates to indicate the presence of input signals; flashes brightly with a 0.1-second hold delay to indicate a...

  • Page 13: Back Panel Controls And Connectors

    Macro-Tech MA-24X6 & 36X12 Power Amplifiers 3 Operation 3.3 Back Panel Controls and Connectors G. Power Cord 120 VAC, 60 Hz units have a 20-amp (12 AWG) line cord with a grounded NEMA 5-15P plug. Input Sensitivity Switch See Section 8 for AC power usage.

  • Page 14: Advanced Features And Options

    14 Macro-Tech MA-24X6 & 36X12 Power Amplifiers This level of protection enables Crown to increase output transistor utilization while greatly increasing amplifier reliability.

  • Page 15: Transformer Thermal Protection

    Macro-Tech MA-24X6 & 36X12 Power Amplifiers 4 Advanced Features and Options 4.1.4 Transformer Thermal Protection All Macro-Tech amplifiers have transformer thermal protection. It protects the power sup- plies from damage under the rare conditions of transformer temperatures rising too high. A...

  • Page 16: Advanced Features

    • Listen Bus allow easy connection to an audio monitoring system. page 16 Macro-Tech MA-24X6 & 36X12 Power Amplifiers 4.3.3 Input Sensitivity Switch The Input Sensitivity Switch is located inside the PIP compartment at the back of the ampli- fier (Figure 4.1). It is set at the factory to 0.775 volt for rated output into 8 ohms.

  • Page 17: Troubleshooting

    Macro-Tech MA-24X6 & 36X12 Power Amplifiers 5 Troubleshooting 5.1 Indicators The front panel has several helpful indicator LEDs (Figure 5.1). The amber Enable indicator is provided to show the amplifier has been turned on (or enabled) and that its low voltage power supply and forced-air cooling system are working.
  • Page 18 Macro-Tech MA-24X6 & 36X12 Power Amplifiers 5 Troubleshooting Figure 5.2 ODEP and Signal/IOC Indicator States page 18 Operation Manual...

  • Page 19: Theory Of Operation

    Macro-Tech MA-24X6 & 36X12 Power Amplifiers 6 Theory of Operation Each channel is powered by its own power transformer, T100 or T200. Both channels share TF-1, a low voltage transformer. The sec- ondary outputs of each transformer are full- wave rectified by heavy duty bridge rectifiers and are filtered by large computer grade capac- itors.
  • Page 20 BIAS LIMIT PNP HI OUTPUT STAGE TRANSLATOR (ODEP) –Vcc –Vcc ONLY ONE CHANNEL SHOWN Figure 6.1 Circuit Block Diagram (Channel 1) Macro-Tech MA-24X6 & 36X12 Power Amplifiers (ODEP) NPN LOW OUTPUT STAGE +Vcc BIAS BRIDGE –Vcc BALANCE PNP LOW OUTPUT...

  • Page 21: Specifications

    Macro-Tech MA-24X6 & 36X12 Power Amplifiers 7 Specifications Minimum Guaranteed Power Power in watts per channel,1 kHz, 0.1% THD Channel 1 2 ohms per ch. 4 ohms per ch. 8 ohms per ch. Channel 2 2 ohms per ch. 4 ohms per ch.
  • Page 22 Weight Shipping Center of gravity is 6 inches (15.2 cm) behind the front mounting surface page 22 Macro-Tech MA-24X6 & 36X12 Power Amplifiers Macro-Tech 24X6 See Figure 7.3 2, 4, 8, 16 ohms 83:1 ±6% or 38 dB ±0.5 dB (Ch. 1, .775V sensitivity) 124.6:1 ±6% or 42 dB ±0.5 dB (Ch.
  • Page 23 Macro-Tech MA-24X6 & 36X12 Power Amplifiers 7 Specifications Figure 7.1 Typical Frequency Response –1 –2 –3 –4 –5 –6 –7 1400 Figure 7.2 Typical Damping Factor 1200 1000 Figure 7.3 Typical Output Impedance 504.0 126.8 MILLIOHMS 31.8 Operation Manual 8 ohm...

  • Page 24: Ac Power Draw And Thermal Dissipation

    • Duty cycle of continuous speech is 10%. • Duty cycle of infrequent, short duration paging is 1%. page 24 Macro-Tech MA-24X6 & 36X12 Power Amplifiers Here are the equations used to calculate the data presented in Figures 8.1 and 8.2:...

  • Page 25: Thermal Dissipation

    Macro-Tech MA-24X6 & 36X12 Power Amplifiers 8 AC Power Draw and Thermal Dissipation Operation Manual Figure 8.1 Macro-Tech 24X6 Power Draw, Current Draw and Thermal Dissipation at Various Duty Cycles Figure 8.2 Macro-Tech 36X12 Power Draw, Current Draw and Thermal Dissipation at Varioius Duty Cycles...

  • Page 26: Service

    Crown website at www.crownaudio.com, or by calling Crown Customer Service. page 26 Macro-Tech MA-24X6 & 36X12 Power Amplifiers 9.2.2 Factory Service To obtain factory service, fill out the service infor- mation page found in the back of this manual and send it along with your proof of purchase and the defective unit to the Crown factory.

  • Page 27: Warranty

    Macro-Tech MA-24X6 & 36X12 Power Amplifiers 10 Warranty SUMMARY OF WARRANTY Crown International, 1718 West Mishawaka Road, Elkhart, Indiana 46517-4095 U.S.A. warrants to you, the ORIGINAL PURCHASER and ANY SUB- SEQUENT OWNER of each NEW Crown product, for a period of three (3) years from the date of purchase by the original purchaser (the “warranty...
  • Page 28 We will remedy any defect, regardless of the rea- son for failure (except as excluded), by repair, page 28 Macro-Tech MA-24X6 & 36X12 Power Amplifiers WORLDWIDE EXCEPT USA & CANADA replacement, or refund. We may not elect refund DISCLAIMER OF CONSEQUENTIAL AND...

  • Page 29: Crown Factory Service Information Form

    Macro-Tech MA-24X6 & 36X12 Power Amplifiers Owner’s Name : ________________________________________________________________________________________________________________________________________________________________ Shipping Address: ______________________________________________________________________________________________________________________________________________________________ Phone Number: ________________________________Fax Number: ________________________________ Email ________________________________________________________________________________ Model: __________________________________________________________________________________ Serial Number: ________________________________________________________________________ Purchase Date : ________________________________________________________________________________________________________________________________________________________________ (Be sure to describe the conditions that existed when the problem occurred and what attempts were made to correct it.)
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  • Page 31 Macro-Tech MA-24X6 & 36X12 Power Amplifiers This page intentionally left blank. Operation Manual page 31...
  • Page 32 Macro-Tech MA-24X6 & 36X12 Power Amplifiers page 32 Operation Manual...

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