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M Series
M120
1
1
Operation Manual
M240
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 maintenance.
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M Series Power Amplifiers Important Safety Instructions Wichtige Sicherheitsinstruktionen Importantes Instructions de Sécurité Instrucciones de Seguridad Importantes IMPORTANT M Series amplifiers require Class 2 output wiring. 1) Read these instructions. TO PREVENT ELECTRIC SHOCK DO NOT REMOVE TOP OR Les amplificateurs de série de M exigent des câbles de sortie de 2) Keep these instructions. BOTTOM COVERS. NO USER SERVICEABLE PARTS INSIDE. classe 2. REFER SERVICING TO QUALIFIED SERVICE PERSO
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M Series Power Amplifiers Crown International, Inc. DECLARATION of CONFORMITY Issued By: Crown International, Inc. Sue Whitfield FOR COMPLIANCE QUESTIONS ONLY: 1718 W. Mishawaka Road 574-294-8289 Elkhart, Indiana 46517 U.S.A. swhitfield@crownintl.com European Representative's Name and Address: Nick Owen 35, Bassets Field Thornhill Cardiff. South Glamorgen CF14 9UG United Kingdom Equipment Type: Commercial Audio Power Amplifiers Family Name:
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M Series Power Amplifiers Table of Contents Important Safety Instructions .......................................................2 4 Advanced Features and Options .........................14 Declaration of Conformity ............................................................3 4.1 Crown SST Modules ..................................................... 14 1 Welcome ....................................................5 4.2 Fault Monitoring .............................................
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M Series Power Amplifiers � Advanced protection circuitry guards against 1.2 How to Use This Manual 1 Welcome * shorted outputs, open circuits, DC, mis- This manual provides you with the necessary matched loads, general overheating, high-fre- ® information to safely and correctly setup and The M Series of power amplifiers from Crown quency overloads and internal faults. operate your amplifier. It does not cover every represents a new era in affordable, quality aspect of installation, setup
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M Series Power Amplifiers 2.3 Ensure Proper Cooling 2.1 Unpack Your Amplifier 2.2 Install Your Amplifier 2 Setup When using an equipment rack, mount units Please unpack and inspect your amplifier for CAUTION: Before you begin, make sure directly on top of each other. Close any open any damage that may have occurred during your amplifier is disconnected from the spaces in rack with blank panels. DO NOT transit. If damage is found, notify the transpor- power source, with the power switch in
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M Series Power Amplifiers 2 Setup 2.4 Choose Input Wire and Connectors Crown recommends using pre-built or professionally wired, bal- anced line (two-conductor plus shield), 22-24 gauge cables and connectors. Depending upon which amplifier input you choose, you should use either 3-pin male XLR connectors, TRS phone connectors, or terminal forks at the amplifier inputs. Unbalanced line may also be used but may result in noise over long cable runs. Note: Amplifier input connectors not used f
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M Series Power Amplifiers 2 Setup 2.6 Wire Your System 2.6.1 Stereo Mode Typical input and output wiring is shown in Figure 2.7. INPUTS: Connect input wiring for both channels. OUTPUTS: Maintain proper polarity (+/–) on output connectors. Connect Channel-1 loudspeaker’s positive (+) lead to Channel-1 positive (red) terminal of amp; repeat for negative (–). Repeat Channel 2 wiring as for Channel 1. How to Parallel the Inputs in Stereo Mode There are three ways to feed the same signal to
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M Series Power Amplifiers 2 Setup 2.6.2 Bridge-Mono Mode Typical input and output wiring is shown in Figure 2.9. Set the Mode Switch to Bridge. INPUTS: Use only the Channel-1 input connec- tor. NOTE: Crown provides a reference of wiring pin assignments for commonly used connector types in the Crown Amplifier Application Guide available at www.crownaudio. OUTPUTS: If you are using the 5-way binding posts, connect the speaker across the red bind- ing post of each channel. Do not use the black
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M Series Power Amplifiers 2 Setup 2.7 Connect to AC Mains 2.8 Startup Procedure Connect your amplifier to the AC mains power Use the following procedure when first turning on source (power outlet) with the supplied AC power your amplifier: cordset. First, connect the IEC end of the cordset to 1. Turn down the level of your audio source. the IEC connector on the amplifier; then, plug the other end of the cordset to the AC mains. 2. Turn down the level controls of the amplifier. WARNING: The
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M Series Power Amplifiers 3 Operation 3.1 Precautions 4. WARNING: Never connect the output to a power supply, battery or power main. Your amplifier is protected from internal and exter- Electrical shock may result. nal faults, but you should still take the following precautions for optimum performance and safety: 5. Tampering with the circuitry, or making unau- thorized circuit changes may be hazardous and 1. Before use, your amplifier first must be config- invalidates all agency listings. u
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M Series Power Amplifiers 3 Operation E. Ch-1 Level Control E. Ch-2 Level Control Reset Reset I 11 2 2 Clip Fault Power Power Signal Signal Clip Fault Signal Signal Clip Clip Fault Fault D. Ch-1 Signal, D. Ch-2 Signal, Clip A. Power Switch B. Reset Switch C. Power Indicator Clip& Fault & Fault Indicators F. Barrier Block G. Neutrik Combo H. 5-way Binding Post Indicators I. IEC Power Inputs (1/4-inch & XLR) Inputs Output Connectors Cord Connector WARNING ó TO REDUCE THE RISK OF FIRE OR ELECT
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M Series Power Amplifiers 3 Operation 3.2 Front Panel Controls 3.3 Back Panel Controls I. IEC Power Connector and Indicators and Connectors J. Fault Output: RJ11 jack allows monitoring of the amplifier’s Fault status from a remote A. Power Switch F. Barrier Block Inputs: May be wired bal- location. See Section 4.2. anced or unbalanced. Switch turns the amplifier on (“ | ”) or off K. Stereo/Bridge-Mono Switch: Two-posi- ® (“ 0 ”). G. Neutrik Combo Inputs: 1/4-inch tion switch selects either
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M Series Power Amplifiers 4 Advanced Features and Options 4.1 Crown SST Modules 4.2 Fault Monitoring If you choose to design your own circuit to interface this signal to your system, note that Crown optional SST (System Solution Topolo- The Fault (RJ-11) jack, which looks like a tele- this RJ jack is polarity sensitive. Pin 2 must be gies) modules were specially designed to phone plug, is located on the back of your M- grounded, and Pin 5 must be supplied with a improve the versatility of y
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M Series Power Amplifiers 4 Advanced Features and Options 4.3 Optional Barrier Block Outputs slip the hole plugs into place (see Figure 4.4). 4.5 Optional 0.775-V Input Sensi- The plugs should slide easily into position, tivity Setting If you prefer, the 5-way binding post outputs on without forcing. Once in place, the plugs will your M-Series amplifier can be replaced with The M-Series amplifier also provides an help to avoid most accidental or intentional model CEAS1 barrier block outp
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M Series Power Amplifiers 5 Principles of Operation last voltage amplifier, in conjunction with a For the sake of simplicity, only channel one of Following this stage, the signal is put under the bootstrapped current source, drives both pre- the amplifier is described. control of a full-time compressor circuit com- drivers and the bias servo. The bias servo is prised of a symmetrical window detector, a mounted in such a way as to translate the out- Signal is presented to the M120 and M240 b
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M Series Power Amplifiers 5 Principles of Operation The output transistors are protected by the Time A modular RJ-11 jack is mounted on the back Dependent Voltage & Current circuit. This cir- The turn on delay circuit functions to keep the panel (similar to the type used on telephones). cuit protects the devices from extending output relay open until all the voltages are up Pins 2 and 5 are connected to an opto-isolator beyond their safe area of operation, but allows and stable, both in the a
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M Series Power Amplifiers 6 Troubleshooting CONDITION: Power indicator is CONDITION: Distorted sound. POSSIBLE REASON: off. POSSIBLE REASON � Load is wired incorrectly or Stereo/Mono mode switch is set incorrectly. Check both. � The amplifier has lost AC power. � Input signal level is too high. Turn down your � The amplifier’s Power switch is off. amplifier level controls, or turn down the input signal, until the clip LED goes out. � The amplifier’s power cord is not plugged in at either
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M Series Power Amplifiers 7 Specifications Minimum Guaranteed Power M120 M240 1 kHz with 0.5% THD Stereo, 2 ohms (per ch.) 570W 1,000W Stereo, 4 ohms (per ch.) 465W 680W Stereo, 8 ohms (per ch.) 285W 405W Bridge mono, 4 ohms 1,120W 2,000W Bridge mono, 8 ohms 920W 1,380W Performance M120 M240 Sensitivity (volts RMS) for full rated power at 8 ohms 1.4 V, switchable to 26 dB gain 1.4 V, switchable to 26 dB gain Frequency Response (at 1 watt, 20Hz - 25
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M Series Power Amplifiers 7 Specifications Performance M120 M240 Damping Factor (8 ohm): 10 Hz to 400 Hz > 400 > 400 Crosstalk (below rated power, 20 Hz to 20 kHz) > 55 dB > 55 dB Common Mode Rejection (CMR)(20 Hz to 1 kHz) > 70 dB > 70 dB DC Output Offset (Shorted input) ± 10 mV ± 10 mV Input Impedance (nominally balanced, nominally unbalanced) 20 kilohms, 10 kilohms 20 kilohms, 10 kilohms Load Impedance (Note: Safe with all types of loads) Stereo 2-8 ohms 2-8 ohms Bridge Mono 4-
