Models: Macro-Tech® 602, 1202 & 2402 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: 219-294-8000. Fax: 219-294-8329. Macro-Tech ® amplifiers are produced by the Professional Audio Unit 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 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 Technical Support Group Plant 2 SW, 1718 W. Mishawaka Rd.
Macro-Tech® 602/1202/2402 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® 602/1202/2402 Power Amplifiers CONTENTS 1 Welcome ............................................................................ 7 1.1 Unpacking ................................................................... 7 1.2 Features ....................................................................... 7 2 Controls, Indicators & Connectors ................................... 9 3 Installation ....................................................................... 11 3.1 Mounting ......................
Macro-Tech® 602/1202/2402 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 3.14 3.15 4.1 4.2 4.3 5.1 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 6.11 6.12 6.13 7.1 7.2 7.3 8.1 8.2 8.3 8.4 Page 6 Macro-Tech Amplifier ................................................................ 7 Front Panel Controls & Indicators ............................................... 9 Rear Panel Controls & Connectors ..........................................
Macro-Tech® 602/1202/2402 Power Amplifiers Fig. 1.1 Macro-Tech Amplifier 1 Welcome Congratulations on your purchase of the renowned Macro-Tech ® professional power amplifier. Macro-Tech amplifiers are designed to provide enormous levels of pure, undistorted power in a rugged low-profile package—making them the choice for pro sound reinforcement. They utilize our patented ODEP ® protection circuitry to keep the show going long after other amplifiers have shut down.
Macro-Tech® 602/1202/2402 Power Amplifiers switch and adjustable front-panel level controls. ❏ Versatile 5-way binding posts make it easy to connect output wiring. ❏ Full protection from shorted, open and mismatched loads, general overheating. DC, high-frequency overloads, and full internal fault protection are provided by our latest protection scheme: “Quad-Mute.
Macro-Tech® 602/1202/2402 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.
Macro-Tech® 602/1202/2402 Power Amplifiers Fig. 2.2 Rear Panel Controls & Connectors (Note: Reset Switches (Item I) only available on the Macro-Tech 2402 model.) 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). (tip and sleeve) input signals. Caution: The Channel 2 input should NOT be used in either Bridge Mono or Parallel Mono mode. I. Reset Switches (Macro-Tech 2402 only) L.
Macro-Tech® 602/1202/2402 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. Fig. 3.1 Mounting Dimensions 3.2 Cooling NEVER block the side or front air vents.
Macro-Tech® 602/1202/2402 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.
Macro-Tech® 602/1202/2402 Power Amplifiers 3.3.2 Bridge-Mono Operation Bridge-Mono mode is intended for driving loads with a total impedance of 4 ohms or more (If the load is less than 4 ohms, see Section 3.3.3). Installing the amplifier in Bridge-Mono mode is very different from the other modes and requires special attention. To put the amplifier in Bridge-Mono mode, turn the amplifier off and slide the stereo/mono switch to the right (as you face the back of the amplifier).
Macro-Tech® 602/1202/2402 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.
Macro-Tech® 602/1202/2402 Power Amplifiers 3.3.4 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 three-pin XLR input connectors and 1/ 4-inch jacks are provided on the standard PIP2-FXQ input module (other PIP modules are described in Section 8.1).
Macro-Tech® 602/1202/2402 Power Amplifiers 910 Ω Please follow the instruction in Section 3.3.2 and 3.3.3 if the amplifier will be used in either Bridge-Mono or Parallel-Mono mode. Remember, do not use the Channel 2 input in either of these mono modes. + A + .003 µF Balanced In – Balanced Out – 910 Ω 1.8 mH + SOLVING INPUT PROBLEMS Sometimes large infrasonic (subaudible) frequencies are present in the input signal. These can damage loudspeakers by overloading or overheating them.
Macro-Tech® 602/1202/2402 Power Amplifiers subjected to a magnetic field from a power cord or power transformer. One way to prevent inductive coupling is to lace the input cables together along their length and route them as far away as possible from power transformers and power cords. The use of shielded pair cable is another effective way to reduce or eliminate hum resulting from inductive coupling. gauge (thickness) for the length being used.
Macro-Tech® 602/1202/2402 Power Amplifiers trol of the loudspeakers. The latter problem occurs because the damping factor decreases as the cable resistance increases. This is very important because the amplifier’s excellent damping factor can easily be negated by insufficient loudspeaker cables. Use the nomograph in Figure 3.13 and the procedure that follows to find the recommended wire gauge (AWG or American Wire Gauge) for your system. 1.
Macro-Tech® 602/1202/2402 Power Amplifiers Another way to prevent the amplifier from prematurely activating its protection systems and to protect inductive loads from large low-frequency currents is to connect a 590 to 708 µF nonpolarized capacitor and 4-ohm, 20-watt resistor in series with the amplifier’s output and the positive (+) lead of the transformer. The circuit shown in Figure 3.14 uses components that are available from most electronic supply stores. 3.3.
Macro-Tech® 602/1202/2402 Power Amplifiers 4 Operation 4.1 Precautions Macro-Tech amplifiers are protected from internal and external faults, but you should still take the follow precautions for optimum performance and safety: 1. Improper wiring for Stereo, Bridge-Mono and Parallel-Mono modes can result in serious operating difficulties. Refer to Section 3.3 for details. 2. WARNING: Do not change the position of the stereo/mono switch unless the amplifier is first turned off. 3.
Macro-Tech® 602/1202/2402 Power Amplifiers The table in Figure 4.2 shows the possible states for the ODEP and Signal/IOC indicators. It also describes the conditions that may be associated with the different indicator states. The Enable indicator will be off with the first indicator state, “There is no power to the amplifier.” All other conditions in the table will occur with the En- able indicator turned on.
Macro-Tech® 602/1202/2402 Power Amplifiers 4.3 Protection Systems Macro-Tech amplifiers provide extensive protection and diagnostics capabilities. Protection systems include ODEP, “standby” mode, fuses (or breakers), and special thermal protection for the unit’s transformers. 4.3.1 ODEP Crown invented ODEP to solve two long-standing problems in amplifier design: to prevent amplifier shutdown during demanding operation and to increase the efficiency of the output circuitry.
Macro-Tech® 602/1202/2402 Power Amplifiers cessively low impedance loads and unreasonably high input signals can generate more heat in the transformer than in the output devices. These conditions can overheat the transformer and activate its protection system. Macro-Tech amplifiers are designed to keep working under conditions where other amplifiers would fail. But even when the limits of a Macro-Tech amplifier are exceeded, it will still protect itself—and your investment— from damage. 4.3.
Macro-Tech® 602/1202/2402 Power Amplifiers from the AC mains power receptacle. 2. Remove the PIP module (two screws). 3. Locate the sensitivity switch access hole inside the chassis opening as shown in Figure 4.3. It is located just above the phone jack inputs. 4. Set the switch to the desired position noted on the label for the access hole. The position toward the front panel sets the sensitivity to 1.
Macro-Tech® 602/1202/2402 Power Amplifiers 5 Technical Information 5.1 Overview Your Macro-Tech amplifier incorporates several advanced technological features including real-time computer simulation of output transistor stress, low-stress output stages, an advanced heat sink embodiment and the PIP2 (Programmable Input Processor) expansion system. Custom circuitry is incorporated to limit temperature and current to safe levels, making it highly reliable and tolerant of faults.
Macro-Tech® 602/1202/2402 Power Amplifiers Fig. 5.
Macro-Tech® 602/1202/2402 Power Amplifiers The balanced gain stage (U104-C and U104-D) causes balanced to single-ended conversion using a difference amplifier. From there, gain can be controlled with a potentiometer. The error amp (U104-A) amplifies the difference between the output signal and the input signal from the gain pot, and drives the voltage translator stage.
Macro-Tech® 602/1202/2402 Power Amplifiers 6 Specifications The following applies to units in Stereo mode with 8-ohm loads and an input sensitivity of 26 dB gain unless otherwise specified. Standard 1 kHz Power: refers to maximum average power in watts at 1 kHz with 0.1% THD. Full Bandwidth Power: refers to maximum average power in watts from 20 Hz to 20 kHz with 0.1% THD. 120 VAC, 60 Hz Units: refers to amplifiers with dedicated transformers for 120 VAC, 60 Hz power mains.
Macro-Tech® 602/1202/2402 Power Amplifiers Stereo/Mono: A three-position back panel switch used to select Stereo, Bridge-Mono or Parallel-Mono mode. Sensitivity: A three-position switch inside the PIP compartment used to select the input sensitivity for both channels: 0.775 volts or 1.4 volts for standard 1 kHz power, or a 26 dB voltage gain. Reset (Macro-Tech 2402 only): A back panel push button for each channel used to reset the circuit breaker that protects each power supply.
Macro-Tech® 602/1202/2402 Power Amplifiers Crown specifications are guaranteed for three years. In an effort to provide you with as much information as possible about the high power-producing capabilities of your amplifier, we have created the following power matrices. Minimum Guaranteed Power Specifications Crown’s minimum power specifications represent the absolute smallest amount of output power you can expect from your amplifier when it is driven to full output under the given conditions.
Macro-Tech® 602/1202/2402 Power Amplifiers Fig. 6.2 Macro-Tech 1202 Minimum Power Matrix Fig. 6.
Macro-Tech® 602/1202/2402 Power Amplifiers Maximum Power Specifications Crown’s maximum power specifications represent the largest amount of output power you can expect from your amplifier when it is driven to full output under the given conditions. These specifications can be used to prevent loudspeaker and hearing damage. The maximum power matrices include specifications for single cycle and 40 millisecond burst sine waves.
Macro-Tech® 602/1202/2402 Power Amplifiers Fig. 6.5 Macro-Tech 1202 Maximum Power Matrix Fig. 6.
Macro-Tech® 602/1202/2402 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. 6.7 Typical Frequency Response 1400 1200 1000 800 600 400 8 ohm 200 100 0 100 20 1K 10 K 20 K FREQUENCY (Hz) Fig. 6.8 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® 602/1202/2402 Power Amplifiers TEF ® Measurement +45˚ 0˚ –45˚ 100 1K 10 K 20 K FREQUENCY (Hz) Fig. 6.10 Typical Phase Response TEF ® Measurement –51 –57 –63 dB –69 –75 –81 100 1K 10 K 20 K FREQUENCY (Hz) Fig. 6.
Macro-Tech® 602/1202/2402 Power Amplifiers –66 TEF ® Measurement –72 –78 –84 dB –90 –96 –102 100 1K 10 K 20 K FREQUENCY (Hz) Fig. 6.12 Typical Crosstalk for the Macro-Tech 1202 –60 TEF ® Measurement –66 –72 –78 dB –84 –90 –96 100 1K 10 K 20 K FREQUENCY (Hz) Fig. 6.
Macro-Tech® 602/1202/2402 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 602, 1202 and 2402 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® 602/1202/2402 Power Amplifiers Fig. 7.2 Macro-Tech 1202 Power Draw, Current Draw and Thermal Dissipation at Various Duty Cycles Fig. 7.
Macro-Tech® 602/1202/2402 Power Amplifiers 8 Accessories 8.1 PIP and PIP2 Modules For more information on these or other PIPs under development, contact your local dealer or Crown’s Technical Support Group. One advantage of Crown PIP2 compatible amplifiers is the ability to customize them using PIP (Programmable Input Processor) and PIP2 modules. The PIPs shown here may be used in any Crown PIP2-compatible amplifier.
Macro-Tech® 602/1202/2402 Power Amplifiers removable barrier block connectors for quick, solderless connections. P.I.P.-BEQX Same as P.I.P.-BEQC but with XLR connectors. P.I.P.-AMCb combines many of the features found in the P.I.P.-XOV and P.I.P.-CLP to provide both a variable 4thorder Linkwitz-Riley crossover and an IOC-driven or variable-threshold signal-driven compressor.
Macro-Tech® 602/1202/2402 Power Amplifiers 8.2 Cooling Fan Options P.I.P.-FXT uses balanced 1:1 transformers to isolate the source from the inputs. It comes with balanced female 3pin XLR connectors. Every Macro-Tech amplifier has a built-in high-velocity fan that provides optimum cooling. Two optional replacement fan blades are available for special cooling requirements. Crown part C 6594-3 is a quieter, low-velocity fan blade that in many cases can provide adequate cooling.
Macro-Tech® 602/1202/2402 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: Your repaired unit will be returned via UPS ground. Please contact us if other arrangements are required. Always use the original factory pack to transport the unit. CAUTION: To prevent electric shock, do not remove covers. No user serviceable parts inside.
Crown Factory Service Information Shipping Address: Crown International, Inc., Factory Service, Plant 2 SW, 1718 W. Mishawaka Rd.
