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Micro-Tech Series
Operation Manual
Micro-Tech
600, 1200, & 2400
Micro-Tech
601, 1201, & 2401
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 ar
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Micro-Tech Series Power Amplifiers Important Safety Instructions 1) Read these instructions. TO PREVENT ELECTRIC SHOCK DO NOT REMOVE 2) Keep these instructions. TOP OR BOTTOM COVERS. NO USER SERVICE- 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 block any ven
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Micro-Tech Series Power Amplifiers Crown International, Inc. DECLARATION of CONFORMITY Issued By: Crown International, Inc. Sue Whitfield 1718 W. Mishawaka Road 574-294-8289 Elkhart, Indiana 46517 U.S.A. swhitfield@crownintl.com European Representative’s Name and Address: Nick Owen 19 Clos Nant Coslech Pontprennau Cardiff CF23 8ND United Kingdom Equipment Type: Commercial Audio Power Amplifiers Family Name: Micro-Tech Amplifiers Model Names:
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Micro-Tech Series Power Amplifiers Table of Contents 5 Advanced Features and Options .........................14 Important Safety Instructions .................................. 2 5.1 Protection Systems ........................................................ 14 Declaration of Conformity ....................................... 3 5.1.1 ODEP .................................................................... 14 1 Welcome ...................................... 5 5.
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Micro-Tech Series Power Amplifiers 2 How to Use This 1 Welcome Manual ® The Crown Micro-Tech 600, 1200 and 2400 ® • Patented ODEP (Output Device Emula- are the original industry standards for touring tion Protection) circuitry compensates for This manual provides you with the necessary amplifiers. Micro-Tech amplifiers are known overheating and overload to keep the information to safely and correctly set up and around the world as the benchmark for high- amplifier working. operate your amp
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Micro-Tech Series Power Amplifiers 3 Setup 3.1 Unpack Your Amplifier 3.2 Install Your Amplifier 3.3 Ensure Proper Cooling When using an equipment rack, mount units YOU WILL NEED (not supplied): CAUTION: Before you begin, make sure your amplifier is disconnected from the directly on top of each other. Close any open • Input wiring cables power source, with power switch in the spaces in rack with blank panels. DO NOT “off” position and all level controls block front or rear air vents. The sid
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Micro-Tech Series Power Amplifiers 3 Setup 3.4 Choose Input Wire and Connectors Crown recommends using pre-built or profes- sionally wired, balanced line (two-conductor plus shield), 22-24 gauge cables and connec- tors. 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 lines may also be used but may result in noise over long cable runs. The amplifier input connector
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Micro-Tech Series Power Amplifiers 3 Setup 3.5 Choose Output Wire and Con- nectors Crown recommends using pre-built or profes- sionally wired, high-quality, two-conductor, heavy gauge speaker wire and connectors. Use banana plugs, spade lugs or bare wire for your output connectors (Figure 3.5). To prevent short circuits, wrap or otherwise insulate exposed loudspeaker cable connectors. Using the guidelines below, select the appropri- ate size of wire based on the distance from amplifier to
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Micro-Tech Series Power Amplifiers 3 Setup 3.6.3 Parallel-Mono Mode 3.6 Wire Your System Typical input and output wiring is shown in 3.6.1 Stereo Mode Figure 3.6. Turn off the amplifier, and set the Ste- Typical input and output wiring is shown in reo/Mono mode switch on the back to Parallel Figure 3.6. Turn off the amplifier, and set the Mono. Turn down the Channel 2 level control. Stereo/Mono mode switch on the back to Stereo. INPUTS: Connect input wiring to Channel 1 INPUTS: Connect
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26 dB 1.4 V 0.77 V Micro-Tech Series Power Amplifiers 3 Setup 3.9 Connect to AC Mains 3.7 Set Input Sensitivity Connect your amplifier to the AC mains power The three-position input sensitivity switch is located inside the amplifier behind the MT-XLR source (power outlet) with the supplied AC power cordset. module (Figure 4.2 letter “I”). The switch is set at the factory to a sensitivity of 0.775 volt for SENSITIVITY SWITCH INSIDE ACCESS HOLE WARNING: The third prong of the power stand
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Micro-Tech Series Power Amplifiers 4 Operation 4.1 Precautions 3. Do not short the ground lead of an output cable to the input signal ground. This may form a ground Your amplifier is protected from internal and external loop and cause oscillations. faults, but you should still take the following precautions for optimum performance and safety: 4. Never connect the output to a power supply, battery or power main. Electrical shock may 1. Before use, your amplifier first must be configured re
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Micro-Tech Series Power Amplifiers D. Enable Indicator C. ODEP Indicators (Output Device 4.2 Controls, Indicators and 4 Operation Emulation Protection) Connectors Lights when the amplifier is on. AC power is During normal operation, these amber indica- available and the low-voltage power supply and 4.2.1 Front Panel Facilities fan are operational. Does not indicate the status tors glow brightly to show that reserve thermo- dynamic energy is present. They dim of the high-voltage power suppl
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Micro-Tech Series Power Amplifiers 4.2.2 Rear Panel Facilities I. MT-XLR Module balanced (tip, ring and sleeve) or unbalanced (tip 4 Operation and sleeve) lines (refer to Figure 3.5). Balanced XLR This module provides two balanced XLR inputs. ijnputs for each channel are provided with the F. Power Cord Because the MT-XLR connectors are in parallel with MT-XLR module. Barrier-block input connectors are the amplifier’s built-in phone connectors, an input All units are shipped with an appr
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Micro-Tech Series Power Amplifiers 5 Advanced Features and Options NOTE: For detailed information about these controlled slew rate has no effect on audio per- A transformer can overheat during very severe conditions: higher than rated output levels, Crown amplifier features, please consult the formance because the high-frequency limit is Crown Amplifier Application Guide, available well above 20 kHz. This approach protects the excessively low-impedance loads, and unreas- on the Crown website
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Micro-Tech Series Power Amplifiers 5 Advanced Features and Options 5.2 Accessories 5.3 Filter Cleaning A dust filter is provided on the air intake to the 5.2.1 Cooling Fan Options cooling system (Figure 4.1, letter “B”). If this Every Micro-Tech amplifier has a built-in high- filter becomes clogged, the unit will not cool as velocity fan that provides optimum cooling. efficiently as it should and may produce lower- Two optional replacement fan blades are avail- than-normal output levels du
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Micro-Tech Series Power Amplifiers 6 Principles of Operation 6.1 Overview Crown also invented the four-quadrant topol- Aluminum extrusions have been widely used for heat sinks in power amplifiers due to their ogy used in the output stages of each Micro- Micro-Tech amplifiers incorporate several tech- Tech amplifier (see Figure 6.1). This special low cost and reasonable performance. But mea- nological advancements including real-time circuitry is called the Grounded Bridge. It sured on a watts
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Micro-Tech Series Power Amplifiers 6 Principles of Operation 6.2.1 Stereo Operation (Q105) and the –LVA (Q110), with their push- to drive the bridge-balanced output stage. This results in the Vcc supply having exactly one pull effect through the bias servo Q318, drive For simplicity, the discussion of Stereo opera- the fully complementary output stage. half of the output voltage added to their quies- tion will refer to one channel only. Mono opera- cent voltage. D309, D310, D311 and a trimmer
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Micro-Tech Series Power Amplifiers 6 Principles of Operation To further protect the output stages, the pat- opposite polarity of channel 1. This makes it ented ODEP circuitry is used. It produces an possible to deliver twice as much voltage to the analog output proportional to the always load while the protection mechanisms for each changing die temperature of the output transis- channel continue to work independently. tor. This output controls the translator stage previously mentioned, re
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Micro-Tech Series Power Amplifiers 7 Troubleshooting CONDITION: Normal operation. CONDITION: Enable LED on, ODEP LEDs off, no sound. Low-voltage power The Enable (Power) LED is on, and the ODEP LEDs supply and fan are still working. are on or flickering. POSSIBLE REASON: ODEP LEDs on indicates a high energy • Transformer thermal protection has activated. reserve. An ODEP LED flickering means that Amplifier will come back on automatically the energy reserve for the affected channel is di
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Micro-Tech Series Power Amplifiers 8 Specifications Minimum Guaranteed Power MT-600 MT-1200 MT-2400 120 VAC, 60 Hz Units, Stereo mode, per channel, both channels driven 1 kHz with 0,1% THD Stereo, 2 ohms (per ch.) 400 W 675 W 1,050 W Stereo, 4 ohms (per ch.) 325 W 480 W 800 W Stereo, 8 ohms (per ch.) 220 W 310 W 520 W 120 VAC, 60 Hz Units, Bridge mono mode 1 kHz with 0.1% THD Bridge mono, 4 ohms 750 W 1,300 2,070 W Bridge mono, 8 ohms 655 W 970
