Power-Tech.1 Series

Operation Manual

Power-Tech 1.1

Power-Tech 2.1

Power-Tech 3.1

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. The information provided in this manual was deemed accurate as of the publication date. However, updates to this information may have occurred. To obtain the latest version of this manual, please visit the Crown website at www.crownaudio.com. Trademark Notice: Crown, Amcron and ODEP are registered trademarks of Crown International. Grounded Bridge is a trademark of Crown International. Other trademarks are the property of their respective owners.
Some models may be exported under the name Amcron.
2002 by Crown Audio, Inc. P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 574-294-8000

132800-2 2/02

Power-Tech.1 Series Power Amplifiers
Important Safety Instructions
1) 2) 3) 4) 5) 6) 7) Read these instructions. Keep these instructions. Heed all warnings. Follow all instructions. Do not use this apparatus near water. Clean only with a dry cloth. Do not block any ventilation openings. Install in accordance with the manufacturers instructions. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus that produce heat. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong is provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus. Only use attachments/accessories specified by the manufacturer. Use only with a cart, stand, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over. Unplug this apparatus during lightning storms or when unused for long periods of time. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as powersupply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped. To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture. TO PREVENT ELECTRIC SHOCK DO NOT REMOVE TOP OR BOTTOM COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. PRVENIR LE CHOC LECTRIQUE NENLEVEZ PAS LES COUVERCLES. IL NY A PAS DES PARTIES SERVICEABLE LINTRIEUR. TOUS REPARATIONS DOIT ETRE FAIRE PAR PERSONNEL QUALIFI SEULMENT.
IMPORTANT Power-Tech.1 Series amplifiers require Class 2 output wiring.
MAGNETIC FIELD CAUTION! Do not locate sensitive high-gain equipment such as preamplifiers or tape decks directly above or below the unit. Because this amplifier has a high power density, it has a strong magnetic field which can induce hum into unshielded devices that are located nearby. The field is strongest just above and below the unit. If an equipment rack is used, we recommend locating the amplifier(s) in the bottom of the rack and the preamplifier or other sensitive equipment at the top.

11) 12)

WATCH FOR THESE SYMBOLS: The lightning bolt triangle is used to alert the user to the risk of electric shock.

13) 14)

The exclamation point triangle is used to alert the user to important operating or maintenance instructions.

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Table of Contents
Important Safety Instructions... 2 Table of Contents... Welcome... 4 1.1 Features... How to Use This Manual.. Setup... 5 3.1 Unpack Your Amplifier.. 5 3.2 Install Your Amplifier.. 5 3.3 Ensure Proper Cooling.. 5 3.4 Choose Input Wire and Connectors.. 6 3.5 Choose Output Wire and Connectors.. 7 3.6 Wire Your System.. 8 3.6.1 Stereo Mode.. 8 3.6.2 Bridge-Mono Mode.. 8 3.6.3 Parallel-Mono Mode... 8 3.7 Set Input Sensitivity.. 9 3.8 Connect to AC Mains.. 9 3.9 Startup Procedure.. Operation... 9 4.1 Precautions... 9 4.2 Front Panel Controls and Indicators.. 10 4.3 Back Panel Controls and Connectors.. Advanced Features and Options... 13 5.1 Protection Systems.. 13 5.1.1. ODEP... 13 5.1.2 Ultrasonic and Radio Frequency Protection. 13 5.1.3 Drive Protection.. 13 5.1.4 Transformer Thermal Protection.. 13 5.1.5 Fuses and Circuit Breakers.. 13 5.2 Option... 14 5.2.1 MT-BB... Troubleshooting... Specifications... Service... 17 8.1 Worldwide Service.. 18 8.2 US and Canada Service... 18 8.2.1 Service at a US or Canada Service Center. 18 8.2.2 Factory Service... 18 8.2.3 Factory Service Shipping Instructions. Warranty.... 19 Factory Service Information Form.. 21

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1 Welcome
Congratulations on purchasing a Crown Power-Tech.1 Series amplifier. Power-Tech.1 Series amplifiers are compact, professional power amplifiers engineered to meet the most demanding sound reinforcement needs. They compare very favorably to more expensive amplifiers, providing uncolored sound and signal-to-noise ratios commonly associated with recording studios. Modern power amplifiers are sophisticated pieces of engineering capable of producing extremely high power levels. They must be treated with respect and correctly installed if they are to provide the many years of reliable service for which they were designed. In addition, the Power-Tech.1 Series amplifiers include a number of features which require some explanation before they can be used to their maximum advantage. Please take the time to study this manual so that you can obtain the best possible service from your amplifier. 1.1 Features The patented ODEP circuitry and Grounded Bridgedesign combine to provide performance and reliability that surpass all traditional designs.
Safe with any load. Bridge-Mono and Parallel-Mono modes make it easy to optimize the amplifiers performance for a wide range of loads. Complete protection against shorted outputs, mismatched loads, overheating, input/output DC and high-frequency overload; full internal fault protection. Balanced phone jack inputs in parallel with XLR input connectors. Barrier block input connectors are optional. Backed by the industrys ONLY three-year, no-fault, fully transferable and extendable warranty.

2 How to Use This Manual

This manual provides you with the necessary information to safely and correctly set up and operate your amplifier. It does not cover every aspect of installation, setup or operation that might occur under every condition. For additional information, please consult Crowns Amplifier Application Guide (available online at www.crownaudio.com), Crown Technical Support, your system installer or retailer. We strongly recommend you read all instructions, warnings and cautions contained in this manual. Also, for your protection, please send in your warranty registration card today. And save your bill of saleits your official proof of purchase.

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3 Setup
3.1 Unpack Your Amplifier Please unpack and inspect your amplifier for any damage that may have occurred during transit. If damage is found, notify the transportation company immediately. Only you can initiate a claim for shipping damage. Crown will be happy to help. Save the shipping carton as evidence of damage for the shippers inspection. We also recommend that you save all packing materials so you will have them if you ever need to transport the unit. Never ship the unit without the factory pack. YOU WILL NEED (not supplied): Input wiring cables Output wiring cables 3.2 Install Your Amplifier CAUTION: Before you begin, make sure your amplifier is disconnected from the power source, with power switch in the off position and all level controls turned completely down (counterclockwise). Use a standard 19-inch (48.3-cm) equipment rack. See Figure 3.1 for amplifier dimensions. You may also stack amps without using a cabinet. NOTE: When transporting, amplifiers should be supported at both front and back. 3.3 Ensure Proper Cooling When using an equipment rack, mount units directly on top of each other. Close any open spaces in rack with blank panels. DO NOT block front or rear air vents. The side walls of the rack should be a minimum of 2 inches (5.1 cm) away from the amplifier sides, and the back of the rack should be a minimum of 4 inches (10.2 cm) from the amplifier back panel. Figure 3.2 illustrates standard amplifier airflow.

Figure 3.6 Three System Connection Methods

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3.7 Set Input Sensitivity The input sensitivity switch inside the amplifier is set to 0.775 volt RMS at the factory. (Factory setting for international models is 1.4V). It can be changed to 1.4 volts or a voltage gain of 26 dB. The 26 dB gain setting is equivalent to a sensitivity of 2.1 volts for the Power-Tech 1.1, 2.6 volts for the Power-Tech 2.1 and 3.3 volts for the Power-Tech 3.1. To change the input sensitivity: 1. Turn off and unplug the amplifier from the AC source. 2. Remove the input module on the back panel. 3. Locate the labeled access hole for the sensitivity switch (Figure 3.7). The sensitivity switch will not be visible because it is mounted below the hole. Use your little finger to reach it. 4. Set the switch to the desired position. 5. Replace the input module. 3.9 Startup Procedure Use the following procedure when first turning on your amplifier: 1. Turn down the level of your audio source. 2. Turn down the Level controls of the amplifier. 3. Turn on the Power switch. The Enable indicator next to the Power switch should glow. 4. Turn up the level of your audio source to an optimum level. 5. Turn up the Level controls on the amplifier until the desired loudness or power level is achieved. 6. Turn down the level of your audio source to its normal range. If you ever need to make any wiring or installation changes, don't forget to disconnect the power cord.
Figure 3.7 Input Sensitivity Switch
3.8 Connect to AC Mains Connect your amplifier's power cord to the AC mains power source (power outlet). WARNING: The third prong of this connector (ground) is an important safety feature. Do not attempt to disable this ground connection by using an adapter or other methods. Amplifiers don't create energy. The AC mains voltage and current must be sufficient to deliver the power you expect. You must operate your amplifier from an AC mains power source with not more than 10% variation above or below the amplifier's specified line voltage and within the specified frequency requirements (indicated on the amplifier's back panel label). If you are unsure of the output voltage of your AC mains, please consult your electrician.

4 Operation

4.1 Precautions Your amplifier is protected from internal and external faults, but you should still take the following precautions for optimum performance and safety: 1. Before use, configure your amplifier for proper operation as described in the Setup section of this manual. Improper wiring can result in serious operating difficulties. For advanced setup techniques, consult Crown's Amplifier Application Guide available online at www.crownaudio.com. 2. Use care when making connections, selecting signal sources and controlling the output level. The load you save may be your own! 3. Do not short the ground lead of an output cable to the input signal ground. This may form a ground loop and cause oscillations. 4. Never connect the output to a power supply, battery or power main. Electrical shock may result. 5. Tampering with the circuitry, or making unauthorized circuit changes may be hazardous and invalidates all agency listings. 6. Do not operate the amplifier with the IOC LED constantly flashing yellow. 7. Do not overdrive the mixer, which will cause clipped signal to be sent to the amplifier. Such signals will be reproduced with extreme accuracy, and loudspeaker damage may result. 8. Do not operate the amplifier with less than the rated load impedance. Due to the amplifier's output protection, such a configuration may result in premature clipping and speaker damage. Crown is not liable for damage that results from overdriving other system components.
For help with determining your system's optimum gain structure (signal levels) please refer to the Crown Amplifier Application Guide, available online at www.crownaudio.com.

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4.2 Front Panel Controls and Indicators The diagram below explains the controls and indicators on the front panel of the Power-Tech.1 Series. A. Level Controls Continuously variable level controls for each channel. B. SPI/IOC Indicator Dual-function indicator for each channel flashes green for signal presence (SPI) and yellow if any distortion exceeds 0.05% (IOC). C. Enable Indicator Enable indicator shows the on/off status of the lowvoltage supply. D. Power Switch Power switch (and circuit breaker for the Power-Tech 1.1, Power-Tech 2.1 and 220/240 VAC Power-Tech 3.1). E. Ventilation Grille Removable grille and dust filter.
Figure 3.8 Power-Tech.1 Series Front Panel Controls and Indicators

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CTs Multi-Channel Power Amplifiers
4.3 Back Panel Controls and Connectors The diagram below explains the controls and connectors on the back panel of the Power-Tech.1 Series. F. Stereo/mono Switch Stereo/mono switch for selecting Stereo, Bridge-Mono or Parallel-Mono modes. G. Reset Switch Circuit breaker reset switch (100/120 VAC Power-Tech 3.1 only) H. Power Cord I. XLR Input Connectors Balanced XLR connectors for input. J. 1/4-inch Input Connectors 1/4-inch balanced phone jacks for input.

Figure 3.9 Power-Tech.1 Series Back Panel Controls and Connectors

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5 Advanced Features and Options
NOTE: For detailed information about these Crown amplifier features, please consult the Crown Amplifier Application Guide, available on the Crown website at www.crownaudio.com. 5.1 Protection Systems Your Crown amplifier provides extensive protection systems, including ODEP, ultrasonic/RF protection, drive protection, transformer thermal protection and fuses or circuit breakers to protect the power supplies. 5.1.1 ODEP Crown invented ODEP to prevent amplifier shutdown during demanding operation, and to increase the efficiency of the output circuitry. To do this, Crown measured the safe operating area (SOA) of each output transistor before installing it in an amplifier. Next, Crown designed intelligent circuitry to simulate the instantaneous operating conditions of those output transistors. Its name describes what it does: Output Device Emulation Protection or ODEP. In addition to simulating output transistor operating conditions, it compares their operation to their known SOA. If ODEP sees that more power will be asked of the output devices than they can deliver, ODEP immediately limits the drive level until it falls within the SOA. Limiting is proportional and kept to an absolute minimumonly what is required to prevent output transistor damage. Under normal conditions, no limiting is required and ODEP is transparent to the audio signal. 5.1.2 Ultrasonic and Radio Frequency Protection An amplifier's slew rate only needs to be large enough to deliver the maximum voltage at the highest required frequency. Higher slew rates actually let the amplifier reproduce undesirable frequencies. By design, Power-Tech.1 Series amplifiers have a controlled slew rate to put a frequency limit on the highest frequencies that they reproduce. This limit occurs well above 20 kHz, so there is no audible effect on performance. This approach protects the amplifier from radio frequencies and can even protect some sensitive loads (including some tweeters). 5.1.3 Drive Protection This system temporarily removes output drive to protect the amplifier and its loads. Drive protection can be activated in two situations. First, if dangerous subsonic frequencies or direct current (DC) is detected in the amplifier's output, drive protection will activate. The amplifier resumes normal operation when it no longer detects dangerous output. Activating this protection is very unlikely, but improper source signals like infrasonic square waves or a severely clipped input signal can activate this system. Second, the amplifier's fault protection system puts the affected channel into drive protection mode in rare situations where heavy commonmode current is detected in its output. The amplifier should never output heavy commonmode current unless its circuitry is damaged. Activating drive protection helps prevent further damage. 5.1.4 Transformer Thermal Protection This activates in the rare case where the unit's transformer temperature rises to unsafe levels. Then the amplifier will remove power to the high-voltage transformer. The fan will continue to run in all units except those with 220/240 VAC transformers. The amplifier will return to normal after it cools to a safe temperature. Your amplifier is designed to keep working under conditions where other amplifiers would fail. But even when you exceed the limits of a Power-Tech.1 Series amplifier, it still protects itself and your investment from damage. 5.1.5 Fuses and Circuit Breakers Your amplifier's low-voltage power supply is protected by an internal fuse, and its high-voltage power supplies are protected by a circuit breaker. The circuit breaker is built into the power switch for all Power-Tech 1.1, PowerTech 2.1 and 220/240 VAC Power-Tech 3.1 amplifiers. The circuit breaker is located on the back panel of 100/120 VAC Power-Tech 3.1 amplifiers. With rated loads and output levels, the circuit breaker will shut down the amplifier only in the rare instance of a catastrophic amplifier failure. Other protection systems such as ODEP keep the amplifier operational under most other severe conditions. The breaker can also shut down the amplifier if extremely low-impedance loads and high output levels result in current draw that exceeds the breaker rating.

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Again, this should be possible only when operating outside rated conditions, as when the amplifier is used to drive a 1-ohm load, or when driving a severely clipped signal. A Power-Tech.1 Series amplifier will not blow its fuse or trip its breaker unless something is wrong. In the rare event that an internal fuse blows, please refer the unit to a qualified technician. If a breaker trips, try to identify and correct the problem before resetting the breaker. The breaker for the Power-Tech 1.1 and 2.1 can be reset using the front panel power switch. The circuit breaker for a Power-Tech 3.1 can be reset using the back panel reset switch. If the problem persists, refer the unit to an authorized Crown Service Center. 5.2 Option 5.2.1 MT-BB The MT-BB is an accessory panel that provides barrier strip input connectors. An MT-BB accessory might be desirable in applications requiring bare wire or spade lug connections. Like other unused input connectors on your Power-Tech.1 Series amplifier, these barrier strip connectors can be used to daisy chain an input signal from one amplifier to another.

CH-2 INPUT

CH-1 INPUT
Important: The MT-BB must be installed at a Crown Factory Service Center or the Crown factory.

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1. 5. g i F

6 Troubleshooting

CONDITION: No power to the amplifier. POSSIBLE REASON: The amplifier's Power switch is off. The amplifier is not plugged into the power receptacle. The amplifier's low-voltage power supply fuse has blown. Return amp to Crown or an authorized Crown Service Center for servicing. CONDITION: No sound. POSSIBLE REASON: The amplifier has just been turned on and is still in the 4-second turn-on delay. The amplifier is in drive protection mode. This can occur with improper source signals like infrasonic square waves or input overloads that excessively clip the input signal. The breaker has tripped. First disconnect your speakers from the affected channel(s) one by one to determine if one of the loads is shorted. Reset the breaker and apply an input signal. If the signal presence indicator flashes, then try a different speaker or cable to determine where the short is occurring. If no short can be found, turn off the amp and allow the amp to cool. If indicators do not return to normal after restarting your amp, return amp to Crown or an authorized Crown Service Center for servicing. Input signal level is very low. Level controls are turned down. Input cables are not connected.

15 A 7A Flow-through ventilation from front to side panels Internal heat sinks with forced-air cooling for rapid, uniform heat dissipation EIA Standard 19-inch (48.3 cm) rack mount (EIA RS-310-B) 3.5 inches (8.9 cm 16 inches (40.6 cm) 36 lb 8 oz (16.6 kg) 40 lb 8 oz (18.4 kg) 37 lb 3 oz (16.6 kg) 40 lb 16 oz (18.6 kg)

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8 Service
Crown amplifiers are quality units that rarely require servicing. Before returning your unit for servicing, please contact Crown Factory Service to verify the need for servicing. 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. 8.1 Worldwide Service Service may be obtained from an authorized service center. (Contact your local Crown/ Amcron representative or our office for a list of authorized service centers.) To obtain service, simply present the bill of sale as proof of purchase along with the defective unit to an authorized service center. They will handle the necessary paperwork and repair. Remember to transport your unit in the original factory pack. 8.2 US and Canada Service Service may be obtained in one of two ways: from an authorized service center or from the factory. You may choose either. It is important that you have your copy of the bill of sale as your proof of purchase. 8.2.1 Service at a US or Canada Service Center This method usually saves the most time and effort. Simply present your bill of sale along with the defective unit to an authorized service center to obtain service. They will handle the necessary paperwork and repair. Remember to transport the unit in the original factory pack. A list of authorized service centers in your area can be obtained from the Crown website at www.crownaudio.com, or by calling Crown Factory Service. 8.2.2 Factory Service To obtain factory service, fill out the service information page found in the back of this manual and send it along with your proof of purchase and the defective unit to the Crown factory. For warranty service, we will pay for ground shipping both ways in the United States. Contact Crown Factory Service to obtain prepaid shipping labels prior to sending the unit. Or, if you prefer, you may prepay the cost of shipping, and Crown will reimburse you. Send copies of the shipping receipts to Crown Factory Service to receive reimbursement. Your repaired unit will be returned via UPS ground. Please contact us if other arrangements are required. 8.2.3 Factory Service Shipping Instructions: 1. Before sending a Crown product to the factory for service, first call the Crown Factory Service for a return authorization (RA) number. 2. Be sure to fill out the service information form that follows and enclose it with your shipment, either inside the box or in a packing slip envelope securely attached to the outside of the shipping carton. Do not send the service information form separately. If you are sending the unit from a Shipping Center, we recommend taping the form to the product. We also recommend recording the serial number and model before shipping for your reference. 3. To ensure the safe transportation of your unit to the factory, ship it in an original factory packing container. If you don't have the original carton, you may obtain a product service foam-in-place shipping pack from the Crown Factory Service at the number listed below. For non-warranty service, you may also provide your own shipping pack, however we still recommend using a Crown Supplied Shipping Container. Minimum recommended requirements for materials are as follows: 275 P.S.I. burst test Double-Wall carton that allows for 2-inch solid Styrofoam on all six sides of unit or 3 inches of plastic bubble wrap on all six sides of unit; securely seal the package with an adequate carton sealing tape. Do not use light boxes or "peanuts." Damage caused by poor packing cannot be covered under warranty. 4. Do not ship the unit in any kind of cabinet (wood or metal). Ignoring this warning may result in extensive damage to the unit and the cabinet. Accessories are not needed-do not send the product documentation, cables and other hardware. If you have any questions, please contact Crown Factory Service. Crown Factory Service 1718 W. Mishawaka Rd., Elkhart, Indiana 46517 U.S.A. Telephone: 574-294-8200 800-342-6939 (North America, Puerto Rico, and Virgin Islands only) Facsimile: 574-294-8301 (Technical Support) 574-294-8124 (Factory Service) Internet: http://www.crownaudio.com

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9 Warranty
UNITED STATES & CANADA
SUMMARY OF WARRANTY est, insurance, closing costs, and other finance charges less a reasonable depreciation on the product from the date of original purchase. Warranty work can only be performed at our authorized service centers or at the factory. Warranty work for some products can only be performed at our factory. We will remedy the defect and ship the product from the service center or our factory within a reasonable time after receipt of the defective product at our authorized service center or our factory. All expenses in remedying the defect, including surface shipping costs in the United States, will be borne by us. (You must bear the expense of shipping the product between any foreign country and the port of entry in the United States including the return shipment, and all taxes, duties, and other customs fees for such foreign shipments.) HOW TO OBTAIN WARRANTY SERVICE You must notify us of your need for warranty service within the warranty period. All components must be shipped in a factory pack, which, if needed, may be obtained from us free of charge. Corrective action will be taken within a reasonable time of the date of receipt of the defective product by us or our authorized service center. If the repairs made by us or our authorized service center are not satisfactory, notify us or our authorized service center immediately. DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES YOU ARE NOT ENTITLED TO RECOVER FROM US ANY INCIDENTAL DAMAGES RESULTING FROM ANY DEFECT IN THE NEW CROWN PRODUCT. THIS INCLUDES ANY DAMAGE TO ANOTHER PRODUCT OR PRODUCTS RESULTING FROM SUCH A DEFECT. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATIONS OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU. WARRANTY ALTERATIONS No person has the authority to enlarge, amend, or modify this Crown Warranty. This Crown Warranty is not extended by the length of time which you are deprived of the use of the new Crown product. Repairs and replacement parts provided under the terms of this Crown Warranty shall carry only the unexpired portion of this Crown Warranty. DESIGN CHANGES We reserve the right to change the design of any product from time to time without notice and with no obligation to make corresponding changes in products previously manufactured. LEGAL REMEDIES OF PURCHASER THIS CROWN WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE. No action to enforce this Crown Warranty shall be commenced after expiration of the warranty period. THIS STATEMENT OF WARRANTY SUPERSEDES ANY OTHERS CONTAINED IN THIS MANUAL FOR CROWN PRODUCTS. 12/01

Crown International, 1718 West Mishawaka Road, Elkhart, Indiana 46517-4095 U.S.A. warrants to you, the ORIGINAL PURCHASER and ANY SUBSEQUENT OWNER of each NEW Crown product, for a period of three (3) years from the date of purchase by the original purchaser (the warranty period) that the new Crown product is free of defects in materials and workmanship. We further warrant the new Crown product regardless of the reason for failure, except as excluded in this Warranty. ITEMS EXCLUDED FROM THIS CROWN WARRANTY This Crown Warranty is in effect only for failure of a new Crown product which occurred within the Warranty Period. It does not cover any product which has been damaged because of any intentional misuse, accident, negligence, or loss which is covered under any of your insurance contracts. This Crown Warranty also does not extend to the new Crown product if the serial number has been defaced, altered, or removed. WHAT THE WARRANTOR WILL DO We will remedy any defect, regardless of the reason for failure (except as excluded), by repair, replacement, or refund. We may not elect refund unless you agree, or unless we are unable to provide replacement, and repair is not practical or cannot be timely made. If a refund is elected, then you must make the defective or malfunctioning product available to us free and clear of all liens or other encumbrances. The refund will be equal to the actual purchase price, not including inter-

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WORLDWIDE EXCEPT USA & CANADA
SUMMARY OF WARRANTY Crown International, 1718 West Mishawaka Road, Elkhart, Indiana 46517-4095 U.S.A. warrants to you, the ORIGINAL PURCHASER and ANY SUBSEQUENT OWNER of each NEW Crown1 product, for a period of three (3) years from the date of purchase by the original purchaser (the warranty period) that the new Crown product is free of defects in materials and workmanship, and we further warrant the new Crown product regardless of the reason for failure, except as excluded in this Warranty.
1 Note: If your unit bears the name Amcron, please substitute it for the name Crown in this warranty.
ITEMS EXCLUDED FROM THIS CROWNWARRANTY This Crown Warranty is in effect only for failure of a new Crown product which occurred within the Warranty Period. It does not cover any product which has been damaged because of any intentional misuse, accident, negligence, or loss which is covered under any of your insurance contracts. This Crown Warranty also does not extend to the new Crown product if the serial number has been defaced, altered, or removed. WHAT THE WARRANTOR WILL DO We will remedy any defect, regardless of the reason for failure (except as excluded), by repair,

replacement, or refund. We may not elect refund unless you agree, or unless we are unable to provide replacement, and repair is not practical or cannot be timely made. If a refund is elected, then you must make the defective or malfunctioning product available to us free and clear of all liens or other encumbrances. The refund will be equal to the actual purchase price, not including interest, insurance, closing costs, and other finance charges less a reasonable depreciation on the product from the date of original purchase. Warranty work can only be performed at our authorized service centers. We will remedy the defect and ship the product from the service center within a reasonable time after receipt of the defective product at our authorized service center. HOW TO OBTAIN WARRANTY SERVICE You must notify your local Crown importer of your need for warranty service within the warranty period. All components must be shipped in the original box. Corrective action will be taken within a reasonable time of the date of receipt of the defective product by our authorized service center. If the repairs made by our authorized service center are not satisfactory, notify our authorized service center immediately.
DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES YOU ARE NOT ENTITLED TO RECOVER FROM US ANY INCIDENTAL DAMAGES RESULTING FROM ANY DEFECT IN THE NEW CROWN PRODUCT. THIS INCLUDES ANY DAMAGE TO ANOTHER PRODUCT OR PRODUCTS RESULTING FROM SUCH A DEFECT. WARRANTY ALTERATIONS No person has the authority to enlarge, amend, or modify this Crown Warranty. This Crown Warranty is not extended by the length of time which you are deprived of the use of the new Crown product. Repairs and replacement parts provided under the terms of this Crown Warranty shall carry only the unexpired portion of this Crown Warranty. DESIGN CHANGES We reserve the right to change the design of any product from time to time without notice and with no obligation to make corresponding changes in products previously manufactured. LEGAL REMEDIES OF PURCHASER No action to enforce this Crown Warranty shall be commenced after expiration of the warranty period. THIS STATEMENT OF WARRANTY SUPERSEDES ANY OTHERS CONTAINED IN THIS MANUAL FOR CROWN PRODUCTS. 7/01

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Crown Factory Service Information

Shipping Address: Crown International, Factory Service, 1718 W. Mishawaka Rd., Elkhart, IN 46517 Phone: 1-800-342-6939 or 1-574-294-8200 Fax: 1-574-294-8124
Owners Name : __________________________________________________________________________________________________________________________________________________________________ Shipping Address: ________________________________________________________________________________________________________________________________________________________________ Phone Number: ____________________________________Fax Number: _______________________________ Email:______________________________________________________________________________ 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.) ____________________________________________________________________________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________ Other equipment in system: ______________________________________________________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________

If warranty has expired, payment will be:

Cash/Check

MasterCard

C.O.D.

Purchase Order for Crown Dealer
Card Number:______________________________________ Exp. Date:___________________ Signature:______________________________________________________________________
ENCLOSE THIS PORTION WITH THE UNIT. DO NOT MAIL SEPARATELY.

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P O W E R - T E C H

S E R I E S

PT 3.1
ts hard to please every crowd. But youll have a better chance when you use a Crown Power-Tech.1 Series amplier. Musicians and DJs alike demand a lot from their systemsclean, punchy sound; reliability; ruggedness; smaller size; less weightall at a reasonable price. And Crown PT.1s bring these benets and much more to the table. Thats because at Crown, weve built our reputation around legendary sound and support. Power-Tech.1 Series ampliers are compact, professional stereo power ampliers engineered to meet the most demanding sound reinforcement needs. They compare very favorably to more expensive ampliers, providing uncolored sound and signal-to-noise ratios commonly associated with recording studios. Plus, every Power-Tech.1 amplier is backed by Crowns unequaled Three-Year, NoFault, fully-transferrable warranty that covers everything. With over ve decades of experience designing and building rock-solid products, Crown is the standard in amp technology. So check out the affordable, all-Crown Power-Tech.1. They are a powerful argument for quality and value! For more details about the Power-Tech.1 Series, contact the Crown Technical Support Group at 800-342-6939 or 219-294-8200. Also, visit the Crown Audio website at www.crownaudio.com.

Features

Rugged, professional power amplier built for the road. Quick-access front panel power switch and level controls. Turn-on delay for loudspeaker protection. Patented ODEP circuitry and Grounded Bridge design combine to provide performance and reliability that surpass traditional designs. Easy to read signal presence (SPI) and distortion (IOC ) indicator for each channel. High damping factor provides superior control over low-frequency drivers for a clean, accurate low end. Bridge-Mono and Parallel-Mono modes make it easy to optimize the amplifiers performance for a wide range of loads. Balanced phone jack inputs in parallel with XLR input connectors. Complete protection against shorted outputs, mismatched loads, overheating, input/output DC and high-frequency overload; full internal fault protection. Three-year, No-Fault, fully-transferrable warranty completely protects your investment and guarantees its specications.

Specications

The following applies to units in Stereo mode with 8-ohm loads and an input sensitivity of 26 dB unless otherwise specied. 120 VAC, 60 Hz Units: refers to ampliers with dedicated transformers for 120 VAC, 60 Hz power mains. International Units: refers to ampliers with special multi-tap transformers that make them congurable for several AC mains voltages and line frequencies.
Intermodulation Distortion (IMD): (60 Hz and 7 kHz 4:1) Less than 0.05% from less than 171 milliwatts to full bandwidth power. Damping Factor: Greater than 1,000 from 10 Hz to 400 Hz. Crosstalk: Greater than 90 dB below full bandwidth power from 50 Hz to 4 kHz, rising linearly to greater than 70 dB at 20 kHz. Controlled Slew Rate: Greater than 13 volts/ms. Voltage Gain: 84:1 6% or 38 dB 0.5 dB at 0.775-volt sensitivity; 46:1 6% or 33 dB 0.5 dB at 1.4-volt sensitivity; 20:1 6% or 26 dB 0.5 dB at the maximum level setting.

Output Power:

in Bridge-Mono and 2 to 4 ohms in ParallelMono mode. Required AC Mains: Power requirements are provided on each units back panel. 120 VAC, 60 Hz and 100/120/220/240 VAC, 50 to 60 Hz (non-convertible) units are available. Rated AC mains voltages are 10%. Quiescent power draw is 90 watts or less. 100 and 120 VAC units draw up to 15 amps of current; 220 and 240 VAC units draw up to 7 amps. Low-Voltage Power Supply: A 24 VDC fanformer supply (fan motor winding) regulated to 15 VDC. AC Connector: An appropriate AC line cord and plug are provided. North American units have a standard 3-wire, 15-amp grounded connector (NEMA 5-15P).

Controls

Power: A front panel push button switch used to turn the amplier on and off. Level: A front panel rotary potentiometer for each channel used to control the output level. Stereo/Mono: A three-position back panel switch used to select Stereo, Bridge-Mono or Parallel-Mono mode. Sensitivity: A three-position switch behind the input module used to select the input sensitivity for both channels: 0.775 volts or 1.4 volts for standard 1 kHz power, or 26 dB voltage gain. Reset: A back panel push button switch used to reset the circuit braker that protects the power supplies.

Performance

Frequency Response: 0.1 dB from 20 Hz to 20 kHz at 1 watt. Phase Response: 10 degrees from 10 Hz to 20 kHz at 1 watt. Signal-to-Noise: A-weighted, better than 105 dB below full bandwidth power. Better than 100 dB below full bandwidth power from 20 Hz to 20 kHz. Total Harmonic Distortion (THD): Less than 0.05% at full bandwidth power from 20 Hz to 1 kHz increasing linearly to 0.1% at 20 kHz.
Load Impedance: Safe with all types of loads. Rated for 4 to 8 ohms in Stereo, 8 to 16 ohms

Indicators

Enable: This red indicator shows the on/off status of the low voltage power supply. Signal/IOC: Each channel has a two color indicator that ashes green to show signal presence and yellow if the amplier causes distortion of 0.05% or more.

Protection

Power-Tech.1 Series ampliers are protected against shorted, open or mismatched loads; overloaded power supplies; excessive temperature; chain destruction phenomena; input overload and high-frequency blowups. They also protect loudspeakers from input and output DC, as well as providing protection from turn-on/ turn-off transients. If operating conditions are unreasonable, the patented ODEP circuitry proportionally limits the drive level to protect the output transistors, particularly in the case of elevated temperature. A thermal switch imbedded in the transformer protects the power supplies from overload. In the rare event that a transformer overheats, the thermal switch removes power, waits until the unit has cooled to a safe temperature and then resets itself. Turn On: Four-second delay with no dangerous transients. Contact us if you need to change the delay.

Construction

Durable black nish on steel chassis with special ow-through ventilation from front to side panels. Cooling: Internal heat sinks with forced-air cooling for rapid, uniform heat dissipation. Dimensions: Standard 19-inch (48.3-cm) rack mount width (EIA RS-310-B), 3.5-inch (8.9-cm) height and 16-inch (40.6-cm) depth behind the mounting surface. Approximate Weight: Center of gravity is 6 inches (15.2 cm) behind front mounting surface. 120 VAC, 60 Hz Units: 36 pounds, 8 ounces (16.6 kg) net; 40 pounds, 8 ounces (18.4 kg) shipping weight. International Units: 37 pounds, 3 ounces (16.6 kg) net; 40 pounds, 15 ounces (18.6 kg) shipping weight.

Input/Output

Input Connector: Balanced 1/4-inch phone jacks and XLR connectors in parallel. Input Impedance: Nominally 20 K ohms, balanced; 10 K ohms, unbalanced. Output Connector: Two sets of color-coded binding posts. Output Impedance: Less than 10 milliohms in series with less than 2 microhenries. DC Output Offset: Less than 10 millivolts.

Output Signal

Stereo: Unbalanced, two-channel. Bridge-Mono: Balanced, single-channel. Channel 1 controls are active; Channel 2 controls should be turned down and not used. Parallel-Mono: Unbalanced, single-channel. Channel 1 controls are active; Channel 2 controls should be turned down and not used.
Crowns Three-Year, No-Fault, Fully Transferable Warranty
Crown offers a Three-Year, No-Fault, Fully Transferable Warranty for every new Crown amplieran unsurpassed industry standard. With this unprecedented No-Fault protection, your new Crown amplier is warranted to meet or exceed original specications for the rst three years of ownership. During this time, if your amplier fails, or does not perform to original specications, it will be repaired or replaced at our expense. About the only things not covered by this warranty are those losses normally covered by insurance and those caused by intentional abuse. And the coverage is transferable, should you sell your amplier. See your authorized Crown dealer for full warranty disclosure and details. For customers outside of the USA, please contact your authorized Crown distributor for warranty information or call 219-294-8200.
Crown International P Box 1000.O. Elkhart, IN 46515-1000 TEL: 219-294-8200 FAX: 219-294-8FAX www.crownaudio.com
Specications subject to change without prior notice. Latest information available at www.crownaudio.com. Crown, IOC, ODEP and Grounded Bridge are registered trademarks of Crown International. Other trademarks are the property of their respective owners. Printed in U.S.A. 2001 Crown Audio, Inc.

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