Macro-Tech 24x6 Reference Manual
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Macro-Tech 24x6 Reference Manual

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Models: Macro-Tech 24x6 & 36x12
Some models may be exported under the name Amcron .
© 1996 by Crown International, Inc., P.O. Box 1000, Elkhart, IN 46515-1000 U.S.A. Telephone: 219-294-8000.
Fax: 219-294-8329. Macro-Tech amplifiers are produced by the Professional Audio Division of Crown
International, Inc. Trademark Notice: SmartAmp
Crown ,
®
Macro-Tech ,
®
IOC ,
International, Inc. Other trademarks are the property of their respective owners.
LEVEL
15
12
9
6
3
0
LEVEL
15
12
9
6
3
0
™
and Grounded bridge
®
ODEP ,
®
IQ System ,
®
P.I.P.
LEVEL
15
18
12
ODEP
21
9
24
6
SIGNAL / IOC
27
3
30
CH1
(2400)
(600)
CH2
0
LEVEL
15
18
12
ODEP
21
9
24
6
SIGNAL / IOC
27
3
30
0
CH1
(3600)
(1200)
CH2
™
are trademarks and Amcron ,
®
and TEF
®
are registered trademarks of Crown
18
21
ON
24
OFF
27
30
ENABLE
18
21
ON
24
OFF
27
30
ENABLE
®
®
100131-1
7/96

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Summary of Contents for Macro-Tech 24x6

  • Page 1 Some models may be exported under the name Amcron . ® © 1996 by Crown International, Inc., P.O. Box 1000, Elkhart, IN 46515-1000 U.S.A. Telephone: 219-294-8000. Fax: 219-294-8329. Macro-Tech amplifiers are produced by the Professional Audio Division of Crown International, Inc. Trademark Notice: SmartAmp ™...

  • Page 2: North America

    THREE YEAR FULL WARRANTY NORTH AMERICA WORLDWIDE SUMMARY OF WARRANTY SUMMARY OF WARRANTY The Crown Audio Division of Crown International, Inc., 1718 West The Crown Audio Division of Crown International, Inc., 1718 West Mishawaka Mishawaka Road, Elkhart, Indiana 46517-4095 U.S.A. warrants to you, Road, Elkhart, Indiana 46517-4095 U.S.A.

  • Page 3: Magnetic Field

    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 main- tenance. 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.

  • Page 4: Table Of Contents

    4.4 Controls ..............19 4.5 Filter Cleaning ............20 5 Technical Information ............. 21 5.1 Overview ..............21 5.2 VZ Power (Macro-Tech 36x12 only) ......21 5.2.1 Background ............ 21 5.2.2 The VZ Supply ..........22 5.3 Circuit Theory ............22 6 Specifications ..............
  • Page 5 Typical Damping Factor ............27 Typical Output Impedance ............27 Typical Phase Response ............28 Macro-Tech 24x6 Pwr Draw, Current Draw and Therm Dis ..28 Macro-Tech 36x12 Pwr Draw, Current Draw and Therm Dis ..29 Installing a P.I.P. Module ............30 Installing an MA-LOCK Level Control Shaft Lock ....
  • Page 6 Macro-Tech 24x6 & 36x12 Power Amplifiers Page 6...

  • Page 7: Welcome

    The results Tech 24x6 combines one channel of a Macro-Tech are lower distortion and superior reliability. 2400 with one channel of a Macro-Tech 600 . The Patented ODEP (Output Device Emulation Protection) Macro-Tech 36x12 combines one channel of a Macro- circuitry compensates for overheating and overload to Tech 3600VZ with one channel of a Macro-Tech 1200 .

  • Page 8: Facilities

    Macro-Tech 24x6 & 36x12 Power Amplifiers LEVEL LEVEL ODEP SIGNAL / IOC (3600) (1200) ENABLE Fig. 2.1 Front Facilities 2 Facilities D. ODEP Indicators A. Dust Filter The dust filters remove large particles from the air at During normal operation of the ODEP (Output Device the air intake.

  • Page 9: Rear Facilities

    Note: input connectors, input signals should not be con- Because of its higher output power, the Macro-Tech nected to the phone jacks when certain P.I.P. modules 36x12 has an additional set of binding posts.

  • Page 10: Installation

    Macro-Tech 24x6 & 36x12 Power Amplifiers 3 Installation 3.1 Mounting When mounting the amplifier in a rack cabinet, the side Macro-Tech amplifiers are designed for standard 19 walls of the rack should be at least 2 inches (5 cm) inch (48.3 cm) rack mounting as well as “stack” mount- away from the chassis as shown in Figure 3.2.

  • Page 11: Wiring

    3.3 Wiring This section describes the most common way to install to two-channel operation. They do NOT offer mono the Macro-Tech 24x6 and 36x12 . Each model is de- operation. signed for biamplified systems and includes both a WARNING: Never strap the outputs together for high-power and a medium-power channel.

  • Page 12: Input Connection

    Macro-Tech 24x6 & 36x12 Power Amplifiers 3.3.1 Input Connection Both the balanced XLR and phone jack inputs have a – Note: If two or more channels with nominal impedance of 20 K ohms (10 K ohms with un- the same input ground reference...

  • Page 13: Subsonic Filter Capacitors

    Macro-Tech 24x6 & 36x12 Power Amplifiers 910 Ω SOLVING INPUT PROBLEMS Sometimes large subsonic (subaudible) frequencies .003 Balanced In f µ Balanced Out are present in the input signal. These can damage – – 910 Ω loudspeakers by overloading or overheating them. To 1.8 mH...

  • Page 14: Output Connection

    Macro-Tech 24x6 & 36x12 Power Amplifiers shielded pair cable is another effective way to reduce resistance increases. This is very important because or eliminate hum resulting from inductive coupling. the amplifier’s excellent damping factor can easily be negated by insufficient loudspeaker cables.
  • Page 15 Macro-Tech 24x6 & 36x12 Power Amplifiers SOLVING OUTPUT PROBLEMS 1. Note the load resistance of the loudspeakers connected to each channel of the amplifier. Sometimes high frequency oscillations occur that Mark this value on the Load Resistance line of can cause your amplifier to prematurely activate its pro- the nomograph.

  • Page 16: Additional Load Protection

    – 3.4 AC Power Requirements Fig. 3.12 Inductive Load (Transformer) Network All Macro-Tech amplifiers are shipped with an appro- priate line cord. When possible, use a power recep- tacle on a dedicated circuit and always make sure that 3.3.3 Additional Load Protection it can supply the correct voltage and current.

  • Page 17: Operation

    Parallel-Mono operation! Never bridge the Fig. 4.1 Indicators outputs for Bridge-Mono operation! The Macro-Tech 24x6 and 36x12 cannot be used in ally limits the drive level of the output stages so the any mono mode. amplifier can continue safe operation even when con- 2.

  • Page 18: Protection Systems

    Macro-Tech 24x6 & 36x12 Power Amplifiers Indicator Status Amplifier Condition There is no power to the amplifier and all indicators are off, including the Enable light. ODEP Possible reasons: (1) The amplifier Enable switch is off. (2) The amplifier is not plugged into the power receptacle.

  • Page 19: Standby Mode

    Macro-Tech 24x6 & 36x12 Power Amplifiers ing the drive level. Second, ODEP data is fed to the It is very unlikely that you will ever see a Macro-Tech back panel P.I.P. connector so advanced P.I.P. mod- amplifier activate transformer thermal protection as ules like the IQ–P.I.P.–SMT can use it to monitor and...

  • Page 20: Filter Cleaning

    Macro-Tech its own signal grounds independently. 24x6: 3.1 and 2.2 V for Channel 1 and 2, respectively. The Reset switches for the power supply circuit break- Macro-Tech 36x12: 4.8 and 2.6 V for Channel 1 and 2, ers are located on the back panel.

  • Page 21: Technical Information

    In addition, Aluminum extrusions have been widely used for Macro-Tech 36x12 models also have an articulated VZ heatsinks in power amplifiers due to their low cost and power supply in Channel 1.

  • Page 22: The Vz Supply

    Macro-Tech 24x6 & 36x12 Power Amplifiers supply becomes larger, the power transistors must When the voltage VZ POWER SUPPLY dissipate more heat. Also, the lower the resistance of requirements are the power transistors, the more voltage you can de- high, VZ supplies POWER liver to the load.
  • Page 23 Macro-Tech 24x6 & 36x12 Power Amplifiers signal from the gain pot, and drives the voltage trans- balanced output stage. lator stage. The protection mechanisms that affect the signal path The voltage translator stage channels the signal to the are implemented to protect the amplifier under real- Last Voltage Amplifiers (LVAs), depending on the sig- world conditions.

  • Page 24: Circuit Block Diagram

    Macro-Tech 24x6 & 36x12 Power Amplifiers Fig. 5.5 Circuit Block Diagram (Channel 1) Page 24...

  • Page 25: Specifications

    420 watts into 4 ohms. set to 0.775 V as listed below: 285 watts into 8 ohms. Macro-Tech 24x6 Channel 1 (2400): 83:1 ±12% or 38 dB It is extremely important to have adequate AC power ±0.5 dB. available. Power amplifiers cannot create energy—they Macro-Tech 24x6 Channel 2 (600): 54:1 ±12% or 35 dB...
  • Page 26 6 inches (15 cm) behind the front mounting surface. rated output, or a fixed voltage gain of 26 dB (see Section 4.4). Macro-Tech 24x6: 45 lbs, 4 oz. (20.5 kg). Shipping weight is 54 lbs, 11 oz. (24.8 kg). Output Signal: Unbalanced, two-channel.

  • Page 27: Typical Frequency Response

    Macro-Tech 24x6 & 36x12 Power Amplifiers –1 8 ohm 1 watt 4 ohm –2 2 ohm –3 –4 –5 –6 –7 10 K 100 K FREQUENCY (Hz) Fig. 6.1 Typical Frequency Response 1400 1200 1000 8 ohm 10 K 20 K FREQUENCY (Hz) Fig.

  • Page 28: Typical Phase Response

    100-120 V 230 V btu/hr kcal/hr 100-120 V 230 V btu/hr kcal/hr btu/hr (Watts) (Watts) (Watts) 1342 1205 12.1 1641 1135 1374 1107 Fig. 7.1 Macro-Tech 24x6 Power Draw, Current Draw and Thermal Dissipation at Various Duty Cycles Page 28...

  • Page 29: Ac Power Draw & Heat Dissipation

    Here are the equations used to calculate the data pre- sented in Figures 7.1 and 7.2: amount of power and current drawn from the AC mains by the Macro-Tech 24x6 and 36x12 amplifiers and the Total output power will all x Duty amount of heat produced under various conditions.

  • Page 30: Accessories

    C H - 2 I N P U T C H - 1 I N P U T – – 8.1 P.I.P. Modules One advantage of Macro-Tech amplifiers is the ability to customize them using P.I.P. (Programmable Input Programmable Input Processor (P.I.P.) Processor) and PIP2 modules. Macro-Tech amplifiers P.I.P.–FTE uses balanced 1:1 transformers to isolate the...
  • Page 31 Macro-Tech 24x6 & 36x12 Power Amplifiers C H - 2 C H - 1 C H - 2 I N P U T S C H - 1 I N P U T S Programmable I N P U T...

  • Page 32: Level Control Security Kit

    Macro-Tech 24x6 & 36x12 Power Amplifiers 8.2 Level Control Security Kit The MA-LOCK security accessory can be used to se- ware to lock the two level controls on the front panel of cure your amplifier’s level controls in situations where any Macro-Tech amplifier.

  • Page 33: Service

    Macro-Tech 24x6 & 36x12 Power Amplifiers 9 Service This unit has very sophisticated circuitry which should sent “UPS ground.” (If the unit is under warranty, you only be serviced by a fully trained technician. This is may send it C.O.D. for the cost of freight via UPS one reason why each unit bears the following label: ground.) The factory will return it via UPS ground.
  • Page 35 Crown Factory Service Information Shipping Address: Crown International, Inc., Factory Service, Plant 2 SW, 1718 W. Mishawaka Rd., Elkhart, IN 46517 Phone: 1-800-342-6939 or 1-219-294-8200 Fax: 1-219-294-8301 Owner’s Name: _________________________________________________________________________ Shipping Address: ______________________________________________________________________ Phone Number: _____________________________ Fax Number: _____________________________ Model: ________________________ Serial Number: _____________ Purchase Date: ___________ NATURE OF PROBLEM (Be sure to describe the conditions that existed when the problem occurred and what attempts were made to correct it.) ______________________________________________________________________________...

This manual is also suitable for:

36x12

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