POWER-TECH .1 Series ™ Models: Power-Tech 1.1, 2.1 & 3.1 Some models may be exported under the name Amcron.® ©2001 by Crown Audio, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 219-2948000. Trademark Notice: Power-Tech™ and Grounded Bridge™ are trademarks and Amcron ®, Crown®, IOC ® and ODEP ® are registered trademarks of Crown International, Inc. Other trademarks are the property of their respective owners.
3 YEAR THREE YEAR FULL WARRANTY 3 YEAR WORLDWIDE NORTH AMERICA 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 operation or maintenance. If you need special assistance beyond the scope of this manual, please contact your authorized Crown representative or our Technical Support Group. Crown Technical Support Group Plant 2 SW, 1718 W. Mishawaka Rd., Elkhart, Indiana 46517 U.S.A.
Power-Tech .1 Series Power Amplifiers Important Safety Instructions 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 12) 13) 14) 15) 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 manufacturer’s instructions. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus that produce heat.
Power-Tech .1 Series Power Amplifiers Fig. 1.1 Power-Tech .1 Series Front and Back Panels 1 Welcome 1.2 Features ™ Congratulations on purchasing a Crown Power-Tech .1 Series amplifier. Power-Tech .1 Series amplifiers are compact, professional stereo 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.
Power-Tech .1 Series Power Amplifiers 2 Installation Always remove power from the unit and turn the level controls off (fully counterclockwise) when making or breaking connections. This reduces the chance of blasts that can cause loudspeaker damage. The guidelines below are provided to help you quickly get your amplifier installed and ready to go. Be sure to follow the instructions in Sections 2.1 and 2.2 for the selected mode of operation.
Power-Tech .1 Series Power Amplifiers Fig. 2.
Power-Tech .1 Series Power Amplifiers 2.3 Input Sensitivity Adjustment The input sensitivity switch inside the amplifier is set to 0.775 volts RMS at the factory.* It can be changed to 1.4 volts RMS or a voltage gain of 26 dB as follows: 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. 4. Set the switch to the desired position. 5. Replace the input module.
Power-Tech .1 Series Power Amplifiers 3 Operation 3.1 Precautions Although your amplifier is protected from external faults, the following safety precautions are recommended: 1. There are important differences among the Stereo, Bridge-Mono and Parallel-Mono operating modes. Please refer to Section 2 for additional information. 2. WARNING: Do not change the position of the stereo/mono switch unless the amplifier is first turned off. 3.
Power-Tech .1 Series Power Amplifiers The amplifier’s fault protection system will put the amplifier in drive protection mode in rare situations where heavy common-mode current is detected in the output. The unit should never output heavy common-mode current unless its circuitry is damaged. Activating drive protection helps prevent further damage. 3.3.4 Transformer Thermal Protection All Power-Tech .1 Series amplifiers have transformer thermal protection.
Power-Tech .1 Series Power Amplifiers 4 Specifications The following applies to units in Stereo mode with 8-ohm loads and an input sensitivity of 26 dB unless otherwise specified. Standard 1 kHz Power: refers to maximum average power in watts at 1 kHz with 0.1% THD. Full Bandwidth Power: refers to maximum average power in watts from 20 Hz to 20 kHz with 0.1% THD. 120 VAC, 60 Hz Units: refers to amplifiers with dedicated transformers for 120 VAC, 60 Hz power mains.
Power-Tech .1 Series Power Amplifiers You must provide sufficient AC power to the amplifier. Amplifiers do not create energy—they require proper voltage and current to deliver the power you expect. Parallel-Mono: Unbalanced, single-channel. Channel 1 controls are active; Channel 2 controls should be turned down and not used. Low-Voltage Power Supply: A ±24 VDC fanformer supply (fan motor winding) regulated to ±15 VDC. Protection AC Connector: An appropriate AC line cord and plug are provided.
Power-Tech .1 Series 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 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.
Power-Tech .1 Series Power Amplifiers Fig. 4.2 Power-Tech 2.1 Minimum Power Matrix Fig. 4.3 Power-Tech 3.
Power-Tech .1 Series 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.
Power-Tech .1 Series Power Amplifiers Fig. 4.5 Power-Tech 2.1 Maximum Power Matrix Fig. 4.6 Power-Tech 3.
Power-Tech .1 Series Power Amplifiers 5 Service Option Available 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. Fig. 5.
Power-Tech .1 Series Power Amplifiers 6 Service Crown amplifiers are quality units that rarely require servicing. Before returning your unit for servicing, please contact Crown Technical Support to verify the need for servicing. This unit has very sophisticated circuitry which should only be serviced by an authorized Crown Service Center. This is one reason why each unit bears the following label: Factory Service Shipping Instructions: 1.
Power-Tech .1 Series Power Amplifiers Crown Factory Service Information Shipping Address: Crown Factory Service, Plant 2 SW, 1718 W. Mishawaka Rd.
