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Macro-Tech Series
MA-24X6
Operation Manual
MA-36X12
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 mai
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers Important Safety Instructions 1) Read these instructions. TO PREVENT ELECTRIC SHOCK DO NOT REMOVE TOP OR BOTTOM COVERS. NO USER SERVICE- 2) Keep these instructions. ABLE PARTS INSIDE. REFER SERVICING TO 3) Heed all warnings. QUALIFIED SERVICE PERSONNEL. 4) Follow all instructions. 5) Do not use this apparatus near water. À PRÉVENIR LE CHOC ÉLECTRIQUE N’ENLEVEZ 6) Clean only with a dry cloth. PAS LES COUVERCLES. IL N’Y A PAS DES PAR- 7) Do not bloc
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers Crown International, Inc. TCF Technical Certificate No: P4300CRI1.IWS DECLARATION of CONFORMITY Technical Construction File Route Sue Whitfield Issued By: Crown International, Inc. 574-294-8289 1718 W. Mishawaka Road swhitfield@crownintl.com Elkhart, Indiana 46517 U.S.A. Competent Body’s Name and Address: European Representative's Name and Address: Technology International (Europe) Limited Nick Ow
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers Table of Contents Important Safety Instructions .....................................................................................2 4.1.4 Transformer Thermal Protection ............................................... 15 Declaration of Conformity ..........................................................................................3 4.1.5 Circuit Breakers ..................................................................
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers 1 Welcome Congratulations on your purchase of a Macro- 1.1 Features • Full protection against shorted outputs, 1.2 How to Use This Manual ® Tech dual level professional power amplifier. •Crown’s Grounded Bridge™ design deliv- open circuits, DC, mismatched loads, gen- This manual provides you with the necessary Your amplifier has a separate high-power and ers incredible voltage swings without eral overheating, high frequency overloads information t
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers 2 Setup 2.1 Unpack Your Amplifier 2.2 Install Your Amplifier 2.3 Ensure Proper Cooling When using an equipment rack, mount units Please unpack and inspect your amplifier for CAUTION: Before you begin, make sure any damage that may have occurred during your amplifier is disconnected from the directly on top of each other. Close any open transit. If damage is found, notify the transpor- power source, with power switch in the spaces in rack with blan
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers 2 Setup 2.4 Choose Input Wire Unbalanced Line Balanced Line 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. Figure 2.3 Balanced Input Figure 2.4 Unbalanced Input Connector Wiring Connector Wiring Operation Manual page 7
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers 2 Setup 2.5 Choose Output Wire and Con- OUTPUTS nectors CH-2 CH-1 Crown recommends using pre-built or profes- sionally wired, high-quality, two-conductor, heavy gauge speaker wire and connectors. You may use banana connectors, terminal forks or bare wire for your output connectors (see Figure 2.5). To prevent the possibility of short-circuits, wrap or otherwise insulate exposed loudspeaker cable connectors. Note: Binding post outputs on European
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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. Because each channel produces a different power level, the Macro-Tech 24x6 and 36x12 are dedicated to two-channel operation. They do NOT offer mono operation. WARNING: Never strap the outputs together for Parallel-Mono operat
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers 2 Setup 2.7 Connect to AC Mains 2.8 Startup Procedure Connect the AC power cordset of your amplifier Use the following procedure when first turning to the AC mains power source (power outlet). on your amplifier: NOTE: The third prong of this connector 1. Turn down the level of your audio source. (ground) is an important safety feature. Do not 2. Turn down the level controls of the ampli- attempt to disable this ground connection by fier. using an
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers 3 Operation 3.1 Precautions 3. Do not short the ground lead of an output cable to the input signal ground. This may Your Macro-Tech Series amplifier is protected form a ground loop and cause oscillations. from internal and external faults, but you should still take the following precautions for optimum 4. Never connect the output to a power performance and safety: supply, battery or power main. Elec- trical shock may result. 1. Before use, your a
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers 3 Operation 3.2 Front Panel Controls C. Signal/IOC Indicator namic energy. They dim proportionally as energy reserves decrease. In the event that and Indicators Green LED, one per channel. Dual-pur- pose indicator illuminates to indicate the energy reserves are depleted, the indica- A. Dust Filter presence of input signals; flashes brightly tors turn off and ODEP limiting occurs. with a 0.1-second hold delay to indicate a See Section 4.1 for more
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers 3 Operation used in place of the P.I.P.-FX. They add addi- balanced (tip, ring and sleeve) or unbalanced 3.3 Back Panel Controls L. Balanced XLR Inputs tional features that customize the amplifier for (tip and sleeve) input signals. Because they are and Connectors The factory-installed P.I.P.-FX provides a three- different applications. For information on avail- electrically in parallel with the PIP input con- pin female XLR connector for bala
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers 4 Advanced Features and Options NOTE: For detailed information about This level of protection enables Crown to high-voltage supplies to protect the amplifier and connected loads. The standby mode can be these Crown amplifier features, please increase output transistor utilization while consult the Crown Amplifier Application greatly increasing amplifier reliability. identified using the indicator table in Figure Guide, available on the Crown websi
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers 4 Advanced Features and Options 4.1.4 Transformer Thermal when the amplifier is used to drive a 1-ohm Crown's Grounded Bridge design delivers large Protection load in Stereo mode, or when a signal over- voltage swings without stressing output tran- loads the input and is clipped severely. sistors. The results are higher efficiency, lower All Macro-Tech amplifiers have transformer distortion and superior reliablility. thermal protection. It protects
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers 4 Advanced Features and Options 4.3 Options 4.3.3 Input Sensitivity Switch volts for rated output, the middle position provides a voltage gain of 26 dB, and the The Input Sensitivity Switch is located inside 4.3.1 PIP Modules position toward the back panel sets the sen- the PIP compartment at the back of the ampli- Versatile PIP (Programmable Input Processor) sitivity to 0.775 volt for rated output. fier (Figure 4.1). It is set at the factory to 0.
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers 5 Troubleshooting operation even when conditions are severe. 5.1 Indicators As input overload indicators, they flash brightly (For a more detailed description of ODEP, see with a 0.5 second hold delay to show that an The front panel has several helpful indicator Section 4.1.1). input signal is too large and must be clipped at LEDs (Figure 5.1). the input. The ODEP indicator for the affected channel will The amber Enable indicator is provided t
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers 5 Troubleshooting Figure 5.2 ODEP and Signal/IOC Indicator States page 18 Operation Manual
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers 6 Theory of Operation Each channel is powered by its own power The voltage translator stage channels the signal The protection mechanisms that affect the sig- transformer, T100 or T200. Both channels to the Last Voltage Amplifiers (LVAs), depend- nal path are implemented to protect the ampli- share TF-1, a low voltage transformer. The sec- ing on the signal polarity, from the error amp fier under real-world conditions. These ondary outputs of each t
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Macro-Tech MA-24X6 & 36X12 Power Amplifiers 6 Theory of Operation +Vcc +Vcc A B (ODEP) (ODEP) TRANSLATOR LVA NPN HI NPN LOW OUTPUT OUTPUT STAGE STAGE +Vcc E A XLR OUTPUT B CURRENT ODEP BIAS P.I.P. BIAS LIMIT C + BALANCED D INPUTS BALANCE VARIABLE ERROR BRIDGE –Vcc INPUT STAGE GAIN STAGE AMP BALANCE PNP HI PNP LOW 1/4" PHONE OUTPUT OUTPUT STAGE STAGE TRANSLATOR LVA C D DISPLAY (ODEP) (ODEP) –Vcc –Vcc ONLY ONE CHANNEL SHOWN Figure 6.1 Circuit Block Diagram (Channel 1) page 20 Operatio
