LEVEL 12 15 LEVEL 18 9 12 ODEP 21 15 18 9 21 3 27 ON 24 6 24 6 OFF SIGNAL / IOC 27 3 0 30 CH1 (2400) 0 (600) CH2 LEVEL 12 9 15 30 ENABLE LEVEL 18 12 ODEP 21 15 18 9 21 3 27 ON 24 6 24 6 OFF SIGNAL / IOC 27 3 0 30 CH1 (3600) (1200) CH2 0 30 ENABLE 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.
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.
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 Audio Division Technical Support Group Plant 2 SW, 1718 W.
Macro-Tech 24x6 & 36x12 Power Amplifiers CONTENTS 1 Welcome ............................................................................ 7 1.1 Unpacking ................................................................... 7 1.2 Features ...................................................................... 7 2 Facilities ............................................................................ 8 3 Installation ....................................................................... 10 3.1 Mounting .......
Macro-Tech 24x6 & 36x12 Power Amplifiers ILLUSTRATIONS 1.1 2.1 2.2 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 4.1 4.2 4.3 5.1 5.2 5.3 5.4 5.5 6.1 6.2 6.3 6.4 7.1 7.1 8.1 8.2 Macro-Tech 36x12 Amplifier ...................................................... 7 Front Facilities ........................................................................... 8 Rear Facilities ........................................................................... 9 Mounting Dimensions ..............................
Macro-Tech 24x6 & 36x12 Power Amplifiers Page 6
Macro-Tech 24x6 & 36x12 Power Amplifiers LEVEL 12 9 15 LEVEL 18 12 ODEP 21 15 18 9 21 3 27 ON 24 6 24 6 OFF SIGNAL / IOC 27 3 0 30 CH1 (3600) (1200) CH2 0 30 ENABLE Fig. 1.1 Macro-Tech 36x12 Amplifier 1 Welcome Congratulations on your purchase of a Macro-Tech ® dual level professional power amplifier. Your amplifier has a separate high-power and medium-power channel, making it ideal for biamplified systems.
Macro-Tech 24x6 & 36x12 Power Amplifiers LEVEL 12 15 9 LEVEL 18 12 ODEP 21 15 18 9 21 3 27 ON 24 6 24 6 OFF SIGNAL / IOC 27 3 30 0 A B CH1 (3600) C (1200) CH2 D D C 0 30 B ENABLE E F Fig. 2.1 Front Facilities 2 Facilities A. Dust Filter D. ODEP Indicators The dust filters remove large particles from the air at the air intake. Check the filters regularly to be sure they don’t become clogged.
Macro-Tech 24x6 & 36x12 Power Amplifiers CH-2 FX CH-1 CLASS 1 OUTPUT WIRING REQUIRED. PRE PRE S E T R E 100 VAC / 17.5 A / 50-60 Hz 120 VAC / 16.5 A / 60 Hz SERIAL NUMBER INPUT INPUT 3 Programmable Input Processor (P.I.P.) GND 1 2 THIS AMPLIFIER IS EQUIPPED WITH SELECTABLE INPUT SENSITIVITY. REMOVE P.I.P. MODULE TO ACCESS SENSITIVITY SWITCH. ® INTERNATIONAL, INC. ELECTRONIC EQUIPMENT ELKHART, IN 46517 MADE IN U.S.A.
Macro-Tech 24x6 & 36x12 Power Amplifiers 3 Installation 3.1 Mounting Macro-Tech amplifiers are designed for standard 19 inch (48.3 cm) rack mounting as well as “stack” mounting without a cabinet. In a rack cabinet, it is best to mount them directly on top of each other. This provides efficient air flow and the best support. Important: Due to the weight of the unit, it should be securely fastened at the back of the cabinet.
Macro-Tech 24x6 & 36x12 Power Amplifiers 3.3 Wiring 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. 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.
Macro-Tech 24x6 & 36x12 Power Amplifiers 3.3.1 Input Connection Both the balanced XLR and phone jack inputs have a nominal impedance of 20 K ohms (10 K ohms with unbalanced wiring) and will accept the line-level output of most devices. Female XLR input connectors are provided on the standard P.I.P.-FX input module (other P.I.P. modules are described in Section 8.1).
Macro-Tech 24x6 & 36x12 Power Amplifiers SOLVING INPUT PROBLEMS Sometimes large subsonic (subaudible) frequencies are present in the input signal. These can damage loudspeakers by overloading or overheating them. To attenuate such frequencies, place a capacitor in series with the input signal line. The graph in Figure 3.8 shows some capacitor values and how they affect the frequency response. Use only low-leakage paper, mylar or tantalum capacitors. 910 Ω + A + .003 µf Balanced In – – 910 Ω 1.
Macro-Tech 24x6 & 36x12 Power Amplifiers shielded pair cable is another effective way to reduce or eliminate hum resulting from inductive coupling. Ground loops often result when two or more devices are improperly grounded. This causes undesirable stray currents that may produce hum in the output. The best way to avoid ground loops is to ensure that all system devices are plugged into the same power strip. In addition, make sure that all cable shields are grounded at one end only. resistance increases.
Macro-Tech 24x6 & 36x12 Power Amplifiers 1. Note the load resistance of the loudspeakers connected to each channel of the amplifier. Mark this value on the Load Resistance line of the nomograph. 2. Select an acceptable damping factor and mark it on the Damping Factor line. Your amplifier can provide an excellent damping factor of 1,000 from 10 to 400 Hz in Stereo mode with an 8-ohm load. In contrast, typical damping factors are 50 or lower.
Macro-Tech 24x6 & 36x12 Power Amplifiers Note: The components shown in Figure 3.12 are commonly available from most electronic supply stores. 4-ohm, 20-watt Resistor + + 590 to 708 µf Capacitor 120 VAC, N.P. From Amplifier Output Inductive Load Typical fuses help prevent damage due to prolonged overload, but provide essentially no protection against damage from large transients. To minimize this problem, use high-speed instrument fuses such as the Littlefuse 361000 series.
Macro-Tech 24x6 & 36x12 Power Amplifiers 4 Operation LEVEL 12 9 4.1 Precautions 1. WARNING: Never strap the outputs together for Parallel-Mono operation! Never bridge the outputs for Bridge-Mono operation! The Macro-Tech 24x6 and 36x12 cannot be used in any mono mode. 2. Turn off the amplifier and unplug it from the AC mains before removing a P.I.P. card. 2. Use care when making connections, selecting signal sources and controlling the output level. The load you save may be your own. 3.
Macro-Tech 24x6 & 36x12 Power Amplifiers Indicator Status ODEP OFF SIGNAL / IOC OFF ODEP SIGNAL / IOC ODEP SIGNAL / IOC ODEP SIGNAL / IOC ODEP SIGNAL / IOC ON Amplifier Condition There is no power to the amplifier and all indicators are off, including the Enable light. Possible reasons: (1) The amplifier Enable switch is off. (2) The amplifier is not plugged into the power receptacle. (3) The AC circuit breaker has been tripped. (4) The amplifier’s low-voltage power supply fuse has blown.
Macro-Tech 24x6 & 36x12 Power Amplifiers ing the drive level. Second, ODEP data is fed to the back panel P.I.P. connector so advanced P.I.P. modules like the IQ–P.I.P.–SMT can use it to monitor and control the amplifier. With ODEP, the show keeps going because you get the maximum power with the maximum protection. 4.3.2 Standby Mode At the heart of the protection systems is the standby mode which removes power from the high-voltage supplies to protect the amplifier and connected loads.
Macro-Tech 24x6 & 36x12 Power Amplifiers brilliance and the Signal/IOC indicators should function normally (remain off if no signal is present; flash if a signal is present). SENSITIVITY SWITCH INSIDE ACCESS HOLE 4. After the mute delay, turn up the level of your audio source to the maximum desired level. 5. Turn up the level controls of the amplifier until the maximum desired sound level is achieved. 6. Turn down the level of your audio source to its normal range. 1.4 V 26 dB 0.
Macro-Tech 24x6 & 36x12 Power Amplifiers 5 Technical Information 5.1 Overview Your amplifier incorporates several new technological advancements including low stress output stages, realtime computer simulation of output transistor stress, an advanced heat diffuser embodiment and a modular system for signal input and processing. In addition, Macro-Tech 36x12 models also have an articulated VZ power supply in Channel 1.
Macro-Tech 24x6 & 36x12 Power Amplifiers supply becomes larger, the power transistors must dissipate more heat. Also, the lower the resistance of the power transistors, the more voltage you can deliver to the load. But when you lower the resistance of the transistors, you increase the current passing through them, and again increase the amount of heat they must dissipate. 5.2.
Macro-Tech 24x6 & 36x12 Power Amplifiers signal from the gain pot, and drives the voltage translator stage. The voltage translator stage channels the signal to the Last Voltage Amplifiers (LVAs), depending on the signal polarity, from the error amp U104-A. The +LVA (Q105,Q125) and the –LVA (Q110,Q126), with their push-pull effect through the bias servo Q318, drive the fully complementary output stage.
Page 24 BALANCED INPUTS 1/4" PHONE XLR P.I.P.
Macro-Tech 24x6 & 36x12 Power Amplifiers 6 Specifications The following specifications apply to 120 VAC, 60 Hz units in stereo mode with 8 ohm loads and an input sensitivity of 26 dB unless otherwise specified. 120 VAC, 60 Hz Units: These units have a dedicated transformer for 120 VAC, 60 Hz power mains. International Units: These units have dedicated transformers for various AC mains voltages and line frequencies. Performance Frequency Response: ±0.1 dB from 20 Hz to 20 kHz at 1 watt (see Figure 6.1).
Macro-Tech 24x6 & 36x12 Power Amplifiers the output level. Sensitivity: A three-position switch located inside the P.I.P. compartment used to select one of three input sensitivities for both channels: a sensitivity of 1.4 volts for full rated output, a fixed voltage gain of 26 dB or a sensitivity of 0.775 volts for full rated output (see Section 4.4). Ground Lift: A two-position back panel switch used to isolate the signal ground of the phone jacks from the chassis (AC) ground.
Macro-Tech 24x6 & 36x12 Power Amplifiers +2 +1 0 –1 –2 8 ohm 4 ohm –3 2 ohm 1 watt dB –4 –5 –6 –7 10 100 1K 10 K 100 K FREQUENCY (Hz) Fig. 6.1 Typical Frequency Response 1400 1200 1000 800 600 400 8 ohm 200 100 0 100 20 1K 10 K 20 K FREQUENCY (Hz) Fig. 6.2 Typical Damping Factor 504.0 126.8 6 dB MILLIOHMS 31.8 8.0 2.0 10 100 1K 10 K 100 K FREQUENCY (Hz) Fig. 6.
Macro-Tech 24x6 & 36x12 Power Amplifiers TEF ® Measurement +45˚ 0˚ –45˚ 100 TECHRON TEF ® 1K 10 K 20 K FREQUENCY (Hz) Fig. 6.4 Typical Phase Response (Measured with TEF® Analyzer) Macro-Tech 24x6 L O A D 8 Ohm 4 Ohm 2 Ohm Current Draw (Amps) Thermal Dissipation kcal/hr AC Mains Power Draw (Watts) 100-120 V 230 V btu/hr 992 250 955 9.6 5.0 855 215 782 7.9 4.1 2.3 718 181 609 6.1 3.2 1.7 581 146 436 2.1 1.
Macro-Tech 24x6 & 36x12 Power Amplifiers 7 AC Power Draw and Thermal Dissipation This section provides detailed information about the amount of power and current drawn from the AC mains by the Macro-Tech 24x6 and 36x12 amplifiers and the amount of heat produced under various conditions. The calculations presented here are intended to provide a realistic and reliable depiction of the amplifiers.
Macro-Tech 24x6 & 36x12 Power Amplifiers 8 Accessories FTE CH-2 INPUT + CH-1 INPUT – + – 8.1 P.I.P. Modules One advantage of Macro-Tech amplifiers is the ability to customize them using P.I.P. (Programmable Input Processor) and PIP2 modules. Macro-Tech amplifiers are equipped with an edge card connector inside the back panel P.I.P. compartment. The modules install easily: L BACK PANE ER OF AMPLIFI Programmable Input Processor (P.I.P.) P.I.P.
Macro-Tech 24x6 & 36x12 Power Amplifiers CH-1 PUSH PUSH INPUT PUSH INPUT FMX 3 Programmable Input Processor (P.I.P.) GND 1 P.I.P.–CLP detects and prevents overload. Its compressor is driven by the amplifier’s built-in IOC error detection circuitry. Unlike typical signal-driven compressors, it only compresses the signal to prevent overload. It can deliver up to 13 dB of additional headroom without being noticeable. ISO CH-2 INPUT + + 3 CH-1 INPUTS GND 1 2 P.I.P.
Macro-Tech 24x6 & 36x12 Power Amplifiers 8.2 Level Control Security Kit The MA-LOCK security accessory can be used to secure your amplifier’s level controls in situations where the front panel controls are subject to tampering. The MA-LOCK security kit includes the necessary hard- ware to lock the two level controls on the front panel of any Macro-Tech amplifier. For more information, contact your local Crown dealer or Crown’s Technical Support Group. Fig. 8.
Macro-Tech 24x6 & 36x12 Power Amplifiers 9 Service This unit has very sophisticated circuitry which should only be serviced by a fully trained technician. This is one reason why each unit bears the following label: CAUTION: To prevent electric shock, do not remove covers. No user serviceable parts inside. Refer servicing to a qualified technician. sent “UPS ground.” (If the unit is under warranty, you may send it C.O.D. for the cost of freight via UPS ground.) The factory will return it via UPS ground.
Crown Factory Service Information Shipping Address: Crown International, Inc., Factory Service, Plant 2 SW, 1718 W. Mishawaka Rd.
