COM-TECH ® ODEP ENABLE I OC P OW ER SPI CH1 CH2 OFF ODEP ENABLE I OC P OW ER SPI CH1 CH2 OFF ODEP ENABLE I OC P OW ER SPI CH1 CH2 OFF ODEP ENABLE I OC P OW ER SPI CH1 CH2 OFF Models: Com-Tech 200, 400, 800 & 1600 Some models may be exported under the name Amcron.® Copyright ©1995 by Crown International, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 219-294-8000. Com-Tech amplifiers are produced by the Professional Audio Division of Crown International, Inc.
3 YEAR T H REE Y EAR FU LL WARRAN T Y 3 YEAR WORLDWI DE N ORT H AM ERI CA 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 Division Technical Support Group 57620 C.R.
Com-Tech 200/400/800/1600 Power Amplifiers CONTENTS 1 Welcome ........................................................................... 7 1.1 Unpacking ................................................................. 7 1.2 Features .................................................................... 7 2 Facilities ............................................................................ 8 3 Installation ....................................................................... 10 3.1 Mounting ..........
Com-Tech 200/400/800/1600 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 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 7.4 8.1 8.2 8.3 Com-Tech Amplifiers (120 VAC, 60 Hz Units) ........................... 6 Front Facilities ........................................................................... 8 Rear Facilities ............................................................................
Com-Tech 200/400/800/1600 Power Amplifiers ODEP ENABLE I OC P OW ER SPI CH1 CH2 ODEP OFF ENABLE I OC P OW ER SPI CH1 CH2 ODEP OFF ENABLE I OC P OW ER SPI CH1 CH2 ODEP OFF ENABLE I OC P OW ER SPI CH1 CH2 Fig. 1.
Com-Tech 200/400/800/1600 Power Amplifiers 1 Welcome Congratulations on your purchase of a Com-Tech ® commercial power amplifier. The Com-Tech series is a complete family of amplifiers with a wide range of power output capabilities. Com-Tech amplifiers can directly drive “constant voltage” lines, so you can avoid the expense, distortion and insertion loss associated with step -up transformers for d istrib uted loudspeaker systems.
Com-Tech 200/400/800/1600 Power Amplifiers ODEP ENABLE I OC P OW ER SPI CH1 A B CH2 C D E OFF E D C F G Fig. 2.1 Front Facilities 2 Facilities A. Filter Grille E. Signal Presence Indicators (SPI) A metal grille supports and protects the dust filter (B). To clean the dust filter, detach the grille by removing the screws that fasten it in place. The signal presence indicators flash synchronously with the amplifier’s audio output (see Section 4.2). B.
Com-Tech 200/400/800/1600 Power Amplifiers BB PUSH TO RESET P REG. U.S. PAT. OFF. 4,330,809 4,611,180 RE M ODEL: COM -TECH 200 AC VOLTS: 120 AM PS: 3.5 60 Hz RATED OUTPUT: 150 W/CH INTO 4 OHM S AT 1 KHz WITH 0.1% OR LESS THD. REFER TO OWNER' S M ANUAL K80636-2 FOR FIRE PROTECTIVE SIGNALING USE. H + 8/4 OHM – 70 VOLT 8/4 OHM 70 VOLT IM PORTANT: SERIAL NUMBER REFER TO USER' S FOR FIRE PROTECTIVE SIGNALING USE.
Com-Tech 200/400/800/1600 Power Amplifiers 3 Installation This section covers basic Com-Tech installation procedures. If your amplifier will be used in a Fire Protective Signaling application, refer to Section 9 as well. 3. 1 M ounting Com-Tech amplifiers are designed for standard 19 inch (48.3 cm) rack mounting or stacking without a cabinet. In a rack, it is best to mount units directly on top of each other. This provides the most efficient air flow and support.
Com-Tech 200/400/800/1600 Power Amplifiers than 400 btu (100 kcal) per hour per unit will need additional cooling. If you want to test your amplifier for sufficient cooling in the real world, an easy way is to observe the ODEP indicators while the amplifier is operating under worst-case conditions. If the indicators dim, additional cooling is recommended. 17 in 43.2 cm IMPORTANT: Be sure the back of the amplifier is supported. 16 in 40.6 cm AIR FLOW AIR FLOW AMPLIFIER (TOP VIEW) 2 in (5 cm) MIN.
Com-Tech 200/400/800/1600 Power Amplifiers AIR FLOW BLOWER (OPTION 2) FRONT OF RACK DOOR ducing the temperature of the air circulated through the rack. If you intend to install air conditioning for your amplifiers, you may want to use Section 7 to determine the hourly thermal dissipation of your system. 3. 3 Wiring EQUIPMENT RACK (SIDE VIEW) AIR FLOW BLOWER (OPTION 1) Fig. 3.
Com-Tech 200/400/800/1600 Power Amplifiers WARNING: The output mode switches must be set the same (8/4 ohm or 70 volt mode) when operating in Bridge-Mono or Parallel-Mono mode. When connecting a 70 volt step-down transformer, do not exceed its power rating. Too much power can saturate a transformer and cause it to appear as a short circuit to the amplifier. If this happens, no damage should occur, but the amplifier may run less efficiently.
Com-Tech 200/400/800/1600 Power Amplifiers channel can be used to drive a 70 volt line. Installation is intuitive: input channel 1 feeds output channel 1, and input channel 2 feeds output channel 2. 140 volt distributed loudspeaker systems. If you will be using 140 volt output, you may need to cross-reference the ratings of the step-down transformer taps with Crown’s constant voltage computer (see Section 8.3). If you need a single channel with higher power to drive a 70 volt line, use Parallel-Mono mode.
Com-Tech 200/400/800/1600 Power Amplifiers minals (see Figure 3.6 and the middle illustration in Figure 3.7). The positive lead from the load connects to the positive channel 1 terminal, and the negative (or ground) lead from the load connects to the positive c hannel 2 terminal. Do not c onnec t the outp ut grounds ( ). Also, the load must be balanced (neither side shorted to ground). single high-powered 70 volt constant voltage line. CAUTION: Only connect balanced equipment (meters, switches, etc.
Com-Tech 200/400/800/1600 Power Amplifiers CHANNEL 1 8/4 OHM 70 VOLT 8/4 OHM 70 VOLT TURN OFF THE AMPLIFIER BEFORE CHANGING THE OUTPUT MODE SWITCHES. WARNING: BOTH CHANNELS MUST BE SET TO 70 VOLT MODE. CH1 CH2 NOT USED MIXER BB P PUSH TO RESET CH - 2 I N P U T + ADD A 14 GAUGE OR LARGER JUMPER BETWEEN THE CHANNEL 1 AND 2 POSITIVE (+) TERMINALS. CH - 1 I N P U T – + – RESS RE SET Programmable Input Processor (P. I.P.
Com-Tech 200/400/800/1600 Power Amplifiers tween the positive (+) terminals of both channels. Note: If two or more channels with the same input ground reference are driven from the same INPUT floating source, connect Floa t ing only one shield to the source chassis. sourc e CAUTION: When Parallel-Mono wiring is installed, do not attempt to operate in Dual or Bridge-Mono mode until the wiring is removed (especially the jumper wire). Failure to do so will result in high distortion and excessive heating.
Com-Tech 200/400/800/1600 Power Amplifiers 1.8 K Ω .003 µf Source To Amp dB 0 GND A 3.9 mH .015 µf R 600 Ω Source 6 dB/octave To Amp B GND B 5 mH .018 µf R 600 Ω Source A 12 dB/octave –10 C –20 To Amp GND C 4 kHz Note: A low source impedance (R) can be increased to 600 Ω by an appropriate resistor. 10 kHz 40 kHz 100 kHz Frequency Fig. 3.11 Unbalanced RFI Filters high frequencies.
Com-Tech 200/400/800/1600 Power Amplifiers .0002 Use Good Connectors .0004 RS SOURCE RESISTANCE (ohms) .0006 1. To prevent possible short circuits, do not expose the loudspeaker cable connectors. .001 RL RS 2. Do not use connectors that might accidentally tie two channels together when making or breaking connections (for example, a standard three-wire stereo phone plug). .002 DAMPING FACTOR 20,000 10,000 .004 .006 .01 5,000 3.
Com-Tech 200/400/800/1600 Power Amplifiers damping factor is the value on the “Annealed Copper Wire” line. Note: Wire size increases as the AWG gets smaller. 7. If the size of the cable exceeds what you want to use, (1) find a way to use shorter cables, like using the IQ System, (2) settle for a lower damping factor, or (3) use more than one cable for each line. Options 1 and 2 will require the substitution of new values for cable length or damping factor in the nomograph.
Com-Tech 200/400/800/1600 Power Amplifiers mechanical damage from large transient voltages. In both cases, special fuses may be used to protect your loudspeakers, or you may opt for the convenience of a P.I.P. module that provides loudspeaker protection. This means that your loudspeakers will tend to have better protection when the woofers are protected by slow-blow fuses and high-frequency drivers are protected by high-speed instrument fuses.
Com-Tech 200/400/800/1600 Power Amplifiers 4 Operation 4. 1 Precautions Although your amplifier is protected from internal and external faults, you should still take the following precautions for optimum performance and safety: 1. Improper wiring for the Dual, Bridge-Mono and Parallel-Mono modes, as well as the 8/4 ohm and 70 volt output modes can result in serious operating difficulties. Refer to Section 3.3.1 for details. 2.
Com-Tech 200/400/800/1600 Power Amplifiers Indicator Status ODEP OFF I OC OFF SPI OFF ODEP ON I OC OFF SPI OFF ODEP OFF I OC ON SPI OFF ODEP OFF I OC OFF SPI Active Amplifier Condition There is no power to the amplifier. Possible reasons: (1) The amplifier’s Enable switch is off. (2) The amplifier is not plugged into the power receptacle. (3) The AC mains circuit breaker has been tripped. (4) The amplifier’s back panel circuit breaker has been tripped.
Com-Tech 200/400/800/1600 Power Amplifiers present conditions, ODEP immediately limits the drive level until it falls within the SOA. Limiting is proportional and kept to an absolute minimum—only what is required to prevent output device damage. This level of protection enables Crown to increase output efficiency to never-before-achieved levels while greatly increasing amplifier reliability. The on-board intelligence is monitored in two ways.
Com-Tech 200/400/800/1600 Power Amplifiers SENSITIVITY SWITCH INSIDE ACCESS HOLE like when the amplifier is used to drive a 1 ohm load, or when an input signal is clipped severely. 4. 4 Controls The Enable switch is located on the front panel so you can easily turn the amplifier on and off. If you ever need to make any wiring or installation changes, don’t forget to disconnect the power cord. Please follow these steps when first turning on your amplifier: 1. Turn down the level of your audio source.
Com-Tech 200/400/800/1600 Power Amplifiers 5 Technical Information 5. 1 Overview Com-Tech amplifiers incorporate several new technological advancements including real-time computer simulation, low-stress output stages, an advanced heat sink embodiment and the Programmable Input Processor (P.I.P.) expansion system. Custom circuitry is incorporated to limit temperature and current to safe levels making it highly reliable and tolerant of faults.
Com-Tech 200/400/800/1600 Power Amplifiers +Vcc +Vcc TRANSLATOR BALANCE INPUT STAGE BALANCED VARIABLE GAIN STAGE NPN HI OUTPUT STAGE ERROR AMP A B C CURRENT LIMIT BIAS OU T PU T (DISPLAY) D BARRIER BLOCK PNP HI OUTPUT STAGE DISPLAY D E NPN LOW OUTPUT STAGE ENABLE +Vcc ODEP P.I.P. I N PU T A (ODEP) LVA TRANSLATOR + (DISPLAY) C (ODEP) HS TEMP LVA Fig. 5.
Com-Tech 200/400/800/1600 Power Amplifiers sitivity switch and the back panel level control. The error amp (U104-C) amplifies the difference between the output signal and the input signal from the gain pot, and drives the voltage translator stage. Thermal sensors S100 and S200 give the ODEP circuits vital information on the operating temperature of the heat sink on whic h the outp ut d evic es are mounted.
Com-Tech 200/400/800/1600 Power Amplifiers Approved for THX Theatre Systems (CT-400 & 800) 120 VAC North American Units: ® Commercial Audio E106377 ® Fire Protective Signaling S5206 Commercial ® Audio LL 32521C 6 Specifications The following specifications apply to all models in Dual mode with 8 ohm loads and an input sensitivity of 26 dB unless otherwise specified. In Fire Protective Signaling Applications, the specifications in Section 9 supersede several of the specifications that follow.
Com-Tech 200/400/800/1600 Power Amplifiers Parallel-Mono mode: 440 watts into 2 ohms. 440 watts into 4 ohms. 455 watts with 70 volt output. Com-Tech 800 Dual mode (with both channels driven): 490 watts into 4 ohms. 305 watts into 8 ohms. 460 watts with 70 volt output. Bridge-Mono mode: 975 watts into 8 ohms. 610 watts into 16 ohms. 920 watts in 70 volt mode (140 volt output). Parallel-Mono mode: 965 watts into 2 ohms. 610 watts into 4 ohms. 915 watts with 70 volt output.
Com-Tech 200/400/800/1600 Power Amplifiers terminal connections for each output channel. Com-Tech 800 : 10 amperes. Output Impedance: Less than 10 milliohms in series with less than 2 microhenries (see Figure 6.11). Com-Tech 1600 : 20 amperes. DC Output Offset: Less than ±10 millivolts. Output Signal Dual: Unbalanced, two-channel. Bridge-Mono: Balanced, single-channel. Channel 1 controls are active; channel 2 should be turned down. Parallel-Mono: Unbalanced, single-channel.
Com-Tech 200/400/800/1600 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.
Com-Tech 200/400/800/1600 Power Amplifiers Dual 120 VAC, 60 Hz (both channels driven) Bridge-Mono (balanced output) Parallel-Mono 100/120 VAC, 50/60 Hz Dual (both channels driven) Bridge-Mono (balanced output) Parallel-Mono 220/240 VAC, 50/60 Hz Dual (both channels driven) Bridge-Mono (balanced output) Parallel-Mono Load in Ohms Dual/Mono Mode (Constant Voltage) AC Mains Com-Tech 400 – Minimum Guaranteed Power (Watts) Maximum Average FTC Continuous Average At 0.1% THD (See note 1) At 0.
Com-Tech 200/400/800/1600 Power Amplifiers Dual 120 VAC, 60 Hz (both channels driven) Bridge-Mono (balanced output) Parallel-Mono 100/120 VAC, 50/60 Hz Dual (both channels driven) Bridge-Mono (balanced output) Parallel-Mono 220/240 VAC, 50/60 Hz Dual (both channels driven) Bridge-Mono (balanced output) Parallel-Mono Load in Ohms Dual/Mono Mode (Constant Voltage) AC Mains Com-Tech 800 – Minimum Guaranteed Power (Watts) Maximum Average FTC Continuous Average At 0.1% THD (See note 1) At 0.
Com-Tech 200/400/800/1600 Power Amplifiers Dual 120 VAC, 60 Hz (both channels driven) Bridge-Mono (balanced output) Parallel-Mono 100/120 VAC, 50/60 Hz Dual (both channels driven) Bridge-Mono (balanced output) Parallel-Mono 220/240 VAC, 50/60 Hz Dual (both channels driven) Bridge-Mono (balanced output) Parallel-Mono Load in Ohms Dual/Mono Mode (Constant Voltage) AC Mains Com-Tech 1600 – Minimum Guaranteed Power (Watts) Maximum Average FTC Continuous Average At 0.
Com-Tech 200/400/800/1600 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.
Com-Tech 200/400/800/1600 Power Amplifiers Dual 120 VAC, 60 Hz (both channels driven) Bridge-Mono (balanced output) Parallel-Mono 100/120 VAC, 50/60 Hz Dual (both channels driven) Bridge-Mono (balanced output) Parallel-Mono 220/240 VAC, 50/60 Hz Dual (both channels driven) Bridge-Mono (balanced output) Parallel-Mono Load in Ohms Dual/Mono Mode (Constant Voltage) AC Mains Com-Tech 400 – Maximum Power (Watts) Single Cycle Tone Burst 40 Millisecond Tone Burst At less than 0.
Com-Tech 200/400/800/1600 Power Amplifiers Dual 120 VAC, 60 Hz (both channels driven) Bridge-Mono (balanced output) Parallel-Mono 100/120 VAC, 50/60 Hz Dual (both channels driven) Bridge-Mono (balanced output) Parallel-Mono 220/240 VAC, 50/60 Hz Dual (both channels driven) Bridge-Mono (balanced output) Parallel-Mono Load in Ohms Dual/Mono Mode (Constant Voltage) AC Mains Com-Tech 800 – Maximum Power (Watts) Single Cycle Tone Burst 40 Millisecond Tone Burst At less than 0.
Com-Tech 200/400/800/1600 Power Amplifiers Dual 120 VAC, 60 Hz (both channels driven) Bridge-Mono (balanced output) Parallel-Mono 100/120 VAC, 50/60 Hz Dual (both channels driven) Bridge-Mono (balanced output) Parallel-Mono 220/240 VAC, 50/60 Hz Dual (both channels driven) Bridge-Mono (balanced output) Parallel-Mono Load in Ohms Dual/Mono Mode (Constant Voltage) AC Mains Com-Tech 1600 – Maximum Power (Watts) Single Cycle Tone Burst 40 Millisecond Tone Burst At less than 0.
Com-Tech 200/400/800/1600 Power Amplifiers +2 +1 0 –1 1 watt –2 8 ohm 4 ohm dB –3 –4 –5 –6 –7 10 100 1K 10 K 100 K FREQUENCY (Hz) Fig. 6.9 Typical Frequency Response 1400 1200 1000 800 600 400 8 ohm 200 100 0 100 20 1K 10 K 20 K FREQUENCY (Hz) Fig. 6.10 Typical Damping Factor 504.0 126.8 MILLIOHMS 6 dB 31.8 8.0 2.0 10 100 1K FREQUENCY (Hz) Fig. 6.
Com-Tech 200/400/800/1600 Power Amplifiers TEF ® Measurement +45˚ 0˚ –45˚ 100 TECHRON TEF ® 1K 10 K 20 K FREQUENCY (Hz) Fig. 6.12 Typical Phase Response TEF ® Measurement –66 –72 –78 –84 dB –90 –96 –102 100 TECHRON TEF ® 1K 10 K 20 K FREQUENCY (Hz) Fig. 6.
Com-Tech 200/400/800/1600 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 Com-Tech 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.
Com-Tech 200/400/800/1600 Power Amplifiers Com-Tech 400 L O A D 8 Ohm Dual / 16 Ohm Bridge-Mono / 4 Ohm Parallel-Mono 4 Ohm Dual / 8 Ohm Bridge-Mono / 2 Ohm Parallel-Mono Duty Cycle AC Mains Power Draw (Watts) 50% 390 4.7 40% 320 3.8 30% 250 20% 10% Current Draw (Amps) Thermal Dissipation 100-120 V 220-240 V bt u/ hr kcal/hr AC Mains Power Draw (Watts) 2.1 550 140 410 4.9 1.7 470 120 335 4.0 3.0 1.4 385 100 265 180 2.2 1.0 305 80 110 1.3 0.
Com-Tech 200/400/800/1600 Power Amplifiers 8. 1 P. I. P. M odules FT E One advantage of Com-Tech amplifiers is the ability to customize them using P.I.P. (Programmable Input Processor) modules. Com-Tech amplifiers are equipped with an edge card connector inside the back panel P.I.P. compartment. The modules install easily: CH - 2 I N P U T + – CH - 1 I N P U T + – Programmable Input Processor (P. I.P.) P.I.P.-FTE includes all P.I.P.
Com-Tech 200/400/800/1600 Power Amplifiers I SO CH - 2 I N P U T + PA CH - 1 I N P U T – + – – —WARNING— THIS P. I. P. PROVIDES FULL ISOLATION FOR ISO-M ODIFIED AM PLIFIERS ONLY! DO NOT CONNECT THE OUTPUT GROUND LUG TO THE INPUT COM M ON OR CHASSIS GROUND. REFER TO P. I. P.– ISO OWNER’S M ANUAL FOR FURTHER INFORM ATION. Programmable Input Processor (P. I.P.
Com-Tech 200/400/800/1600 Power Amplifiers 8. 2 Com-Tech 200 Cooling Fan A three-speed cooling fan (part GCT200FAN) is available for North American Com-Tech 200s (all other units include a fan). We strongly recommend the kit if you will be operating a Com-Tech 200 at high levels or in high temperatures for long periods (see Section 3.2.1). CAUTION: Because the installation of this fan involves the risk of electric shock, it should ONLY be attempted by a qualified technician.
Com-Tech 200/400/800/1600 Power Amplifiers 9 Fire Protective Signaling Some installations are required to have an emergency public address system. For these systems, UL provides a special listing called Amplifiers for Fire Protective Signaling Systems. All Com-Tech amplifiers are UL-listed for this type of system. Due to the strenuous nature of the classification, several requirements must be considered for proper installation: 1.
Com-Tech 200/400/800/1600 Power Amplifiers 10 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: CAUTION: To prevent electric shock, do not remove covers. No user serviceable parts inside. Refer servicing to a qualified technician. 10. 1 Worldwide Service Service may be obtained from an authorized service center.
Com-Tech 200/400/800/1600 Power Amplifiers Crown Factory Service Information Shipping Address: Crown International, Inc., Factory Service, 57620 C.R.
