Models: Macro-Tech® 24x6 & 36x12 Some models may be exported under the name Amcron.® © 2000 by Crown International, Inc., P.O. Box 1000, Elkhart, IN 46515-1000 U.S.A. Telephone: 219-2948000. Fax: 219-294-8329. Macro-Tech amplifiers are produced by the Professional Audio Division of Crown International, Inc. 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, Inc.
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 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. Mishawaka Rd., Elkhart, Indiana 46517 U.S.A.
Macro-Tech® 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.
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 Page 6 Macro-Tech 36x12 Amplifier ...................................................... 7 Front Facilities ........................................................................... 8 Rear Facilities ........................................................................... 9 Mounting Dimensions .....................
Macro-Tech® 24x6 & 36x12 Power Amplifiers Fig. 1.1 Macro-Tech 36x12 Amplifier 1 Welcome 1.2 Features 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. The MacroTech 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.
Macro-Tech® 24x6 & 36x12 Power Amplifiers 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. The filter elements can be easily removed for cleaning by gently pulling them away from the front panel. See Section 3.2 and 4.5.
Macro-Tech® 24x6 & 36x12 Power Amplifiers Fig. 2.2 Rear Facilities H. Reset Switches The reset switches are used to reset the breakers that safeguard each power supply from overload. stalled (see Section 3.3.1). The phone jacks can also be used as “daisy chain” outputs to simplify connecting input signals to multiple amplifiers. I. PIP Module K. Ground Lift Switch The standard P.I.P.-FX is included with your amplifier. It provides female XLR input connectors.
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. 3.5 in 8.9 cm 19 in 48.3 cm SIDE VIEW 16 in 40.6 cm 2.5 in 6.35 cm Fig. 3.
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 PIP 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. Fig. 3.10 Balanced RFI Filters Fig. 3.
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 4.1 Precautions Macro-Tech amplifiers are protected from internal and external faults, but you should take the following precautions for optimum performance and safety: 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 PIP card. 2.
Macro-Tech® 24x6 & 36x12 Power Amplifiers Indicator Status ODEP OFF SIGNAL / IOC OFF 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’s 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 the drive level. Second, ODEP data is fed to the back panel PIP connector so advanced PIP 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 function normally (remain off if no signal is present; flash if a signal is present). 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. For ease of use, the Level controls are also located on the front panel.
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 nal 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. VARIABLE GAIN STAGE DISPLAY BALANCE INPUT STAGE ERROR AMP E TRANSLATOR ODEP TRANSLATOR A B C D CURRENT LIMIT C (ODEP) PNP HI OUTPUT STAGE NPN HI OUTPUT STAGE A (ODEP) + +Vcc –Vcc OUTPUT ONLY ONE CHANNEL SHOWN –Vcc LVA BIAS LVA +Vcc D (ODEP) PNP LOW OUTPUT STAGE NPN LOW OUTPUT STAGE B (ODEP) BIAS BRIDGE BALANCE –Vcc +Vcc Macro-Tech® 24x6 & 36x12 Power Amplifiers Fig. 5.
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. 1050 watts into 2 ohms. 800 watts into 4 ohms. 520 watts into 8 ohms. 120 VAC, 60 Hz Units: These units have a dedicated transformer for 120 VAC, 60 Hz power mains. Channel 2 (600): 400 watts into 2 ohms. 325 watts into 4 ohms. 225 watts into 8 ohms.
Macro-Tech® 24x6 & 36x12 Power Amplifiers Controls Enable: A front panel pushbutton used to turn the amplifier on and off. Level: A 31-position detented rotary potentiometer for each channel located on the front panel used to control the output level. Sensitivity: A three-position switch located inside the PIP 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.
Macro-Tech® 24x6 & 36x12 Power Amplifiers Fig. 6.1 Typical Frequency Response Fig. 6.2 Typical Damping Factor Fig. 6.
Macro-Tech® 24x6 & 36x12 Power Amplifiers +45˚ 0˚ –45˚ 100 TECHRON TEF ® 1K 10 K 20 K FREQUENCY (Hz) Fig. 6.4 Typical Phase Response Fig. 7.
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 8.1 PIP Modules One advantage of Macro-Tech amplifiers is the ability to customize them using PIP (Programmable Input Processor) and PIP2 modules. Macro-Tech amplifiers are equipped with an edge card connector inside the back panel PIP compartment. The modules install easily: ally controlled from an inexpensive PC. A total of 15 functions can be either monitored or controlled. Memory backup is also incorporated in case of power failure.
Macro-Tech® 24x6 & 36x12 Power Amplifiers P.I.P.-BEQC adds many features of the Bose® Controllers to the input of your amplifier. Each channel includes a custom equalization network for Bose loudspeakers. Also included is a bass-cut (high-pass) filter for each channel. The equalization and bass-cut filters can be bypassed, if desired. Balanced inputs and “daisy-chain” outputs use removable barrier block connectors for quick, solderless connections. P.I.P.-BEQX Same as P.I.P.-BEQC but with XLR connectors.
Macro-Tech® 24x6 & 36x12 Power Amplifiers 8.2 Level Control Shaft Lock A security accessory, the shaft lock, can be used to secure your amplifier’s level controls in situations where the front panel controls are subject to tampering. One is needed for each channel. They can be ordered through the Crown Service/Parts Department. For more information, contact the Crown Service Department. 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. 9.1 Worldwide Service Service may be obtained from an authorized service center.
Crown Factory Service Information Shipping Address: Crown International, Inc., Factory Service, Plant 2 SW, 1718 W. Mishawaka Rd.
