Crown Micro-Tech 600 Reference Manual
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Micro-Tech 600, 1200 & 2400
Micro-Tech 601, 1201 & 2401
Some models may be exported under the name Amcron .
© 1997 by Crown International, Inc., P.O. Box 1000, Elkhart, IN 46515-1000 U.S.A. Telephone: 219-294-8000.
Fax: 219-294-8329. Micro-Tech amplifiers are produced by the Professional Audio Division of Crown
International, Inc. Trademark Notice: Grounded bridge
Micro-Tech ,
®
ODEP
®
and TEF
®
the property of their respective owners.
Approved for
120 VAC North
THX Theatre
American
Systems
Units Only:
(MT-600 & 1200)
CH1
CH1
Models:
™
is a trademark and Amcron ,
are registered trademarks of Crown International, Inc. Other trademarks are
Commercial
Audio
E106377
®
(MT-600 & 1200)
POWER
ODEP
CH2
OFF
POWER
ODEP
CH2
OFF
®
®
Crown ,
Commercial
Audio
®
LL 32521C
(MT-600 & 1200)
®
Techron ,
®
For
Canada
(MT-2400)
®
102990-1
7/97
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Table of Contents
Related Manuals for Crown Micro-Tech 600
Summary of Contents for Crown Micro-Tech 600
- Page 1 ODEP POWER ODEP Models: Micro-Tech 600, 1200 & 2400 Micro-Tech 601, 1201 & 2401 Some models may be exported under the name Amcron . ® © 1997 by Crown International, Inc., P.O. Box 1000, Elkhart, IN 46515-1000 U.S.A. Telephone: 219-294-8000.
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Page 2: North America
SUMMARY OF WARRANTY The Crown Audio Division of Crown International, Inc., 1718 West The Crown Audio Division of Crown International, Inc., 1718 West Mishawaka Mishawaka Road, Elkhart, Indiana 46517-4095 U.S.A. warrants to you, Road, Elkhart, Indiana 46517-4095 U.S.A. warrants to you, the ORIGINAL... -
Page 3: Magnetic Field
Fax: 219-294-8301 Fax Back (North America only): 800-294-4094 or 219-293-9200 Fax Back (International): 219-294-8100 Internet: http://www.crownintl.com IMPORTANT THE MICRO-TECH 2400 REQUIRES CLASS 1 OUTPUT WIRING. THE MICRO-TECH 600 & 1200 REQUIRE CLASS 2 OUTPUT WIRING. C A U T I O N A V I S RISK OF ELECTRIC SHOCK RISQUE DE CHOC ÉLECTRIQUE... -
Page 4: Table Of Contents
Micro-Tech 600/1200/2400 Power Amplifiers CONTENTS 1 Welcome ................7 1.1 Unpacking ..............7 1.2 Features ..............7 2 Facilities ................8 3 Installation ..............10 3.1 Mounting ..............10 3.2 Cooling ..............10 3.3 Wiring ..............11 3.3.1 Stereo (Two-Channel) Operation ....11 3.3.2 Bridge-Mono Operation ......... - Page 5 Typical Damping Factor ............31 Typical Output Impedance ............31 6.10 Typical Phase Response ............32 6.11 Typical Crosstalk for the Micro-Tech 600 ........32 6.12 Typical Crosstalk for the Micro-Tech 1200 ........ 33 6.13 Typical Crosstalk for the Micro-Tech 2400 ........ 33 Micro-Tech 600 Power Draw, Current Draw and Thermal Dissipation at Various Duty Cycles ...........
- Page 6 Micro-Tech 600/1200/2400 Power Amplifiers Page 6...
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Page 7: Welcome
Congratulations on your purchase of a Micro-Tech ® put stages combine to provide performance and reli- professional power amplifier. Crown’s Micro-Tech 600 , ability that surpass all traditional designs. Micro-Tech 1200 and 2400 are the original industry standards for amplifiers also have an independent high-voltage touring amplifiers. -
Page 8: Facilities
Micro-Tech 600/1200/2400 Power Amplifiers POWER ODEP Fig. 2.1 Front Facilities 2 Facilities A. Filter Grille E. Power Switch This metal grille supports and protects the dust This rocker switch is used to turn the amplifier on and filter (B). To clean the dust filter, detach the grille by off. -
Page 9: Rear Facilities
Micro-Tech 600/1200/2400 Power Amplifiers BRIDGE-MONO WIRING – TURN AMPLIFIER OFF. PUSH TO RESET SET STEREO/MONO CAUTION: SWITCH TO THIS COVER IS NECESSARY FOR OUTPUTS BRIDGE-MONO. EFFICIENT COOLING OF THE AMPLIFIER. OUTPUT ACROSS CLASS 1 RED TERMINALS REMOVE ONLY TO ACCESS GAIN SWITCH. -
Page 10: Installation
Micro-Tech 600/1200/2400 Power Amplifiers You will know when your Micro-Tech amplifier has suffi- 3 Installation cient cooling because its ODEP indicators will be 3.1 Mounting brightly lit. If the amplifier’s ODEP indicators dim or turn off, overly demanding conditions are forcing it to pro- Micro-Tech amplifiers are designed for standard 19- tect itself from overheating. -
Page 11: Wiring
Each Micro-Tech 600 and 1200 can move CAUTION: When making or changing connections, 35 cubic feet (1 cubic meter) of air per minute, and always disconnect the AC power and turn the level each Micro-Tech 2400 can move 45 cubic feet (1.3... -
Page 12: Bridge-Mono Operation
Micro-Tech 600/1200/2400 Power Amplifiers CAUTION: In Stereo mode, never tie the amplifier’s USE THE CHANNEL 2 INPUT or signal quality will be outputs directly together, and never parallel them greatly degraded. Also, turn down the channel 2 level with the output of another amplifier. Such connec- control (fully counterclockwise). -
Page 13: Parallel-Mono Operation
Micro-Tech 600/1200/2400 Power Amplifiers CAUTION: Only connect balanced equipment The channel 2 input and level control are bypassed in (meters, switches, etc.) to the Bridge-Mono output. this mode, and should not be used. Both sides of the line must be isolated from the in- Connect the load to the channel 1 output as shown in put grounds or oscillations may occur. -
Page 14: Input Connection
Micro-Tech 600/1200/2400 Power Amplifiers 3.3.4 Input Connection – The balanced phone jack inputs have a nominal im- Note: If two or more channels with the same input ground reference pedance of 20 K ohms (10 K ohms with unbalanced are driven from the same... -
Page 15: Subsonic Filter Capacitors
Micro-Tech 600/1200/2400 Power Amplifiers SOLVING INPUT PROBLEMS Sometimes large subsonic (subaudible) frequencies .003 Balanced In Balanced Out are present in the input signal. These can damage – – loudspeakers by overloading or overheating them. To 1.8 mH attenuate such frequencies, place a capacitor in se- ries with the input signal line. -
Page 16: Output Connection
Micro-Tech 600/1200/2400 Power Amplifiers conductors that could bisect the magnetic field. excellent damping factor can easily be negated by us- ing insufficient loudspeaker cables. Ground loops will also occur when the input and out- put grounds are tied together. DO NOT CONNECT THE Use the nomograph and the procedure that follow to INPUT AND OUTPUT GROUNDS TOGETHER. -
Page 17: Low-Frequency Protection Circuit For Inductive Loads
Micro-Tech 600/1200/2400 Power Amplifiers 1. Note the load resistance of the loudspeakers connected so the wires for each loudspeaker are kept to each channel of the amplifier. Mark this value on the close together. Do not bundle wires from differ- “Load Resistance”... -
Page 18: Additional Load Protection
Micro-Tech 600/1200/2400 Power Amplifiers 3.3.6 Additional Load Protection A better approach is to fuse each driver independently. Micro-Tech amplifiers can deliver very high power lev- This allows you to apply the most appropriate protec- els, so it’s a good idea to add some protection if its not tion for the type of driver being used. -
Page 19: Operation
Micro-Tech 600/1200/2400 Power Amplifiers 4 Operation POWER ODEP 4.1 Precautions Although your amplifier is protected from internal and external faults, you should still take the following pre- cautions for optimum perfromance and safety: 1. Improper wiring for the Stereo, Bridge-Mono and Parallel-Mono modes can result in serious operat- Fig. -
Page 20: Ultrasonic And Radio Frequency Protection
4.3.3 Drive Protection and cooling fan. Micro-Tech 600 and 1200 high-volt- The drive protection system temporarily removes drive age supplies are protected by internal fuses, while Mi-... -
Page 21: Controls
2.1 volts for the Micro-Tech 600 , 2.5 volts for the Micro-Tech 1200 and 3.2 volts for the Micro-Tech 2400 . 4.5 Filter Cleaning... -
Page 22: Technical Information
Micro-Tech 600/1200/2400 Power Amplifiers 5 Technical Information sented to the load. This feature gives you flexibility to maximize power available to the load. 5.1 Overview A wide bandwidth, multiloop design is used for state- Micro-Tech amplifiers incorporate several technologi- of-the-art compensation. This produces ideal behavior cal advancements including real-time computer simu- and results in ultra-low distortion values. -
Page 23: Circuit Block Diagram
Micro-Tech 600/1200/2400 Power Amplifiers Fig. 5.1 Circuit Block Diagram Page 23... -
Page 24: Bridge-Mono Operation
Micro-Tech 600/1200/2400 Power Amplifiers From the error amp, the voltage translator stage routes cuits vital information on the operating temperature of the signal to the Last Voltage Amplifiers (LVAs) based the heat sink on which the output devices are mounted. -
Page 25: Specifications
1,035 watts into 4 ohms. mum level setting (also see Section 4.4). Micro-Tech 600 : 55:1 ±12% or 35 dB ±1 dB at 0.775 volt Load Impedance: Safe with all types of loads. Rated for 2 sensitivity; 31:1 ±12% or 30 dB ±1 dB at 1.4 volt sensitivity. - Page 26 120 VAC, 60 Hz Units: Input Sensitivity: Settings include 0.775 volts and 1.4 volts Micro-Tech 600 : 36 pounds, 4 ounces (16.5 kg) net; for standard 1 kHz power, or 26 dB gain (see Section 4.4). 41 pounds, 2 ounces (18.7 kg) shipping weight.
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Page 27: Micro-Tech 600 Minimum Power Matrix
Further, because our published specs are set below our “in-house” measurements, you can expect every Crown amplifier to exceed its published minimum power specs. We believe you should get what you pay for. Micro-Tech 600 – Minimum Guaranteed Power (Watts) Minimum Power Notes: All minimum power specifications are based on 0.5%... -
Page 28: Micro-Tech 1200 Minimum Power Matrix
Micro-Tech 600/1200/2400 Power Amplifiers Micro-Tech 1200 – Minimum Guaranteed Power (Watts) Maximum Average FTC Continuous Average Stereo/Mono 0.1% THD+N 0.1% THD+N 0.05% THD+N 0.1% THD + Noise (See note 1) (See note 2) (See note 3) (See note 4) Mode... -
Page 29: Micro-Tech 600 Maximum Power Matrix
7 kHz 50 Hz 1 kHz 7 kHz Stereo (both channels driven) Bridge-Mono 1,165 1,130 (balanced output) Parallel-Mono 1,155 1,120 Stereo (both channels driven) Bridge-Mono 1,240 1,210 (balanced output) Parallel-Mono 1,230 1,225 Fig. 6.4 Micro-Tech 600 Maximum Power Matrix Page 29... -
Page 30: Micro-Tech 1200 Maximum Power Matrix
Micro-Tech 600/1200/2400 Power Amplifiers Micro-Tech 1200 – Maximum Power (Watts) Single Cycle Tone Burst 40 Millisecond Tone Burst Stereo/Mono 0.05% Distortion + Noise 0.05% Distortion + Noise (See note 1) (See note 2) Mode 20 Hz 50 Hz 1 kHz... -
Page 31: Typical Frequency Response
Micro-Tech 600/1200/2400 Power Amplifiers –1 8 ohm 1 watt 4 ohm –2 2 ohm –3 –4 –5 –6 –7 10 K 100 K FREQUENCY (Hz) Fig. 6.7 Typical Frequency Response 1400 1200 1000 8 ohm 10 K 20 K FREQUENCY (Hz) Fig. -
Page 32: Typical Phase Response
® 10 K 20 K FREQUENCY (Hz) Fig. 6.10 Typical Phase Response ® Measurement –45 –51 –57 –63 –69 –75 –81 ® TECHRON TEF 10 K 20 K FREQUENCY (Hz) Fig. 6.11 Typical Crosstalk for the Micro-Tech 600 Page 32... -
Page 33: Typical Crosstalk For The Micro-Tech 1200
Micro-Tech 600/1200/2400 Power Amplifiers ® Measurement –66 –72 –78 –84 –90 –96 –102 TECHRON TEF ® 10 K 20 K FREQUENCY (Hz) Fig. 6.12 Typical Crosstalk for the Micro-Tech 1200 ® Measurement –60 –66 –72 –78 –84 –90 –96 TECHRON TEF ®... -
Page 34: Ac Power Draw And Thermal Dissipation
65%. Voltage Factor (.83) • Typical quiescent power draw for the Micro-Tech 600 The power factor of 0.83 is needed to compensate for is 65 watts; typical quiescent power draw for the Mi- the difference in phase between the AC mains voltage cro-Tech 1200 and 2400 is 80 watts. -
Page 35: Micro-Tech 1200 Power Draw, Current Draw And Thermal Dissipation At Various Duty Cycles
Micro-Tech 600/1200/2400 Power Amplifiers Micro-Tech 1200 L O A D 8 Ohm Stereo / 16 Ohm Bridge-Mono / 4 Ohm Parallel-Mono 4 Ohm Stereo / 8 Ohm Bridge-Mono / 2 Ohm Parallel-Mono 2 Ohm Stereo / 4 Ohm Bridge-Mono / 1 Ohm Parallel-Mono... -
Page 36: Accessories
Micro-Tech 600/1200/2400 Power Amplifiers 8 Accessories 8.1 Cooling Fan Options 8.2.1 MT-XLR The MT-XLR is an accessory panel that provides two Every Micro-Tech amplifier has a built-in high-velocity standard 3-pin female XLR input connectors. The fan that provides optimum cooling. Two optional re-... -
Page 37: Service
Micro-Tech 600/1200/2400 Power Amplifiers 9 Service This unit has very sophisticated circuitry which should Factory Service Shipping Instructions: only be serviced by a fully trained technician. This is 1. When sending a Crown product to the factory one reason why each unit bears the following label:... - Page 39 Crown Factory Service Information Shipping Address: Crown International, Inc., Factory Service, Plant 2 SW, 1718 W. Mishawaka Rd., Elkhart, IN 46517 Phone: 1-800-342-6939 or 1-219-294-8200 Fax: 1-219-294-8124 Owner’s Name: _________________________________________________________________________ Shipping Address: ______________________________________________________________________ Phone Number: _____________________________ Fax Number: _____________________________ Model: ________________________ Serial Number: _____________ Purchase Date: ___________ NATURE OF PROBLEM (Be sure to describe the conditions that existed when the problem occurred and what attempts were made to correct it.) ______________________________________________________________________________...