Crown POWER BASE 1 Reference Manual
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Crown POWER BASE 1 Reference Manual

Power base series power amplifiers
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E106377
®
Applies only to 120 VAC,
North American PB-1,
PB-2 and PB-3 units.
Models:
Power Base -1, 2 & 3
© 1996 by Crown International, Inc., P.O. Box 1000, Elkhart, Indiana
46515-1000 U.S.A. Telephone: 219-294-8000. Power-Tech amplifiers
are produced by the Professional Audio Division of Crown
International, Inc. Trademark Notice: Power Base-3
and Power Base-1
®
, Power Base-2
registered trademarks of Crown International, Inc. Other trademarks
are the property of their respective owners.
™
is a trademark
®
, Crown ,
®
IOC
®
and ODEP
™
POWER
OFF
POWER
OFF
POWER
OFF
LL 32521C
®
are
Applies only to 120 VAC,
North American PB-1
and PB-2 units.
101229-1
12/96
®

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Summary of Contents for Crown POWER BASE 1

  • Page 1 E106377 © 1996 by Crown International, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 219-294-8000. Power-Tech amplifiers are produced by the Professional Audio Division of Crown International, Inc. Trademark Notice: Power Base-3 ® and Power Base-1 registered trademarks of Crown International, Inc. Other trademarks Applies only to 120 VAC, are the property of their respective owners.
  • Page 2 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.

  • Page 3: Magnetic Field

    If you need special assistance beyond the scope of this manual, please contact our Technical Support Group. Crown Audio Division Technical Support Group Plant 2 SW, 1718 W. Mishawaka Rd., Elkhart, Indiana 46517 U.S.A. Phone: 800-342-6939 (North America, Puerto Rico and Virgin Islands) or 219-294-8200...

  • Page 4: Table Of Contents

    Welcome ... 7 1.1 Unpacking ... 7 1.2 Features ... 7 2 Installation ... 9 2.1 Stereo ... 9 2.2 Mono ... 9 2.3 Input Sensitivity Adjustment... 10 2.4 Additional Load Protection ... 10 2.5 Required AC Mains ... 10 3 Operation ...
  • Page 5 Power Base Series Power Amplifiers ILLUSTRATIONS 1.1 Power Base Front and Back Panels ... 7 2.1Three System Connection Methods ... 8 2.2Do NOT Block Air Flow ... 9 2.3Power Base Input Wiring ... 9 2.4Input Sensitivity Switch ... 10 2.5Loudspeaker Fuse Nomograph ... 10 3.1Back Panel Level Controls ...
  • Page 6 Power Base Series Power Amplifiers Page 6...

  • Page 7: Welcome

    Rugged, professional power amplifier built for the road. Mounts in a standard 19 inch (48.3 cm) rack. Crown’s patented grounded bridge circuitry gener- ates large voltage swings while avoiding electrical stress on the output stages. This results in low distortion and high reliability.

  • Page 8: Three System Connection Methods

    MIXER STEREO MODE POWER BASE AMPLIFIER MIXER BRIDGE-MONO MODE POWER BASE AMPLIFIER MIXER PARALLEL-MONO MODE POWER BASE AMPLIFIER Page 8 CHANNEL 1 CHANNEL 2 CH-2 CH-1 STEREO PARALLEL BRIDGE MONO MONO CH.2 GROUND CH.1 LEVEL LIFT LEVEL STEREO CONTROL SWITCH CONTROL PARALLEL BRIDGE...

  • Page 9: Installation

    Power Base 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.

  • Page 10: Input Sensitivity Adjustment

    2.3 Input Sensitivity Adjustment The input sensitivity switch inside the amplifier is set to 0.775 volts at the factory. It can be changed to 1.4 volts or a voltage gain of 26 dB as follows: 1. Turn off and unplug the amplifier from the AC source. 2.

  • Page 11: Operation

    8. Tampering with the circuitry by unqualified person- nel or making unauthorized circuit changes may be hazardous and invalidates all agency listings. Remember: Crown is not liable for any damage that re- sults from overdriving other system components. 3.2 Power Indicator...

  • Page 12: Transformer Thermal Protection

    The unit should never output heavy common-mode cur- rent unless its circuitry is damaged. Activating drive protection helps prevent further damage. 3.3.4 Transformer Thermal Protection All Power Base amplifiers have transformer thermal protection. This protection circuitry is activated in un- usual situations where the unit’s transformer tempera- ture rises to unsafe levels.

  • Page 13: Specifications

    Power Base Series Power Amplifiers 4 Specifications All specifications apply 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 + noise. Full Bandwidth Power: refers to maximum average power in watts from 20 Hz to 20 kHz with 0.1% THD + noise.
  • Page 14 Required AC Mains: Current, frequency and voltage requirements are provided on each unit’s back panel. All models draw 90 watts or less at idle. Power Base-1 : Draws up to 6 amps of current. Power Base-2 : Draws up to 10 amps of current. Power Base-3 : Draws up to 15 amps of current.

  • Page 15: Power Base-1 Minimum Power Matrix

    When measuring power, 0.1% THD appears to be the industry standard for distortion. Two of the maximum average power specifications shown in each minimum power matrix are measured at 0.1% THD so you can easily compare Crown specifications to those of other manu- facturers.

  • Page 16: Power Base-2 Minimum Power Matrix

    Power Base-2 – Minimum Guaranteed Power (Watts) Stereo-Mono Mode Stereo (both channels driven) Bridge-Mono (balanced output) Parallel-Mono Stereo (both channels driven) Bridge-Mono (balanced output) Parallel-Mono Power Base-3 – Stereo-Mono Mode Stereo (both channels driven) Bridge-Mono (balanced output) Parallel-Mono Stereo (both channels driven) Bridge-Mono (balanced output)

  • Page 17: Power Base-1 Maximum Power Matrix

    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.

  • Page 18: Power Base-2 Maximum Power Matrix

    Stereo-Mono Mode Stereo (both channels driven) Bridge-Mono (balanced output) Parallel-Mono Stereo (both channels driven) Bridge-Mono (balanced output) Parallel-Mono Stereo-Mono Mode Stereo (both channels driven) Bridge-Mono (balanced output) Parallel-Mono Stereo (both channels driven) Bridge-Mono (balanced output) Parallel-Mono Page 18 Power Base-2 – Maximum Power (Watts) 40 Millisecond Tone Burst Single Cycle Tone Burst At less than 0.05% THD...

  • Page 19: Accessories

    5 Accessories There are two accessories available at the time of this printing: the MT-XLR and the MT-BB . Important: The MT-XLR and MT-BB must be installed at a Crown Factory Service Center or the Crown factory. 5.1 MT-XLR The MT-XLR is an accessory panel that provides two standard 3-pin female XLR input connectors.

  • Page 20: Service

    To obtain factory service, fill out the service informa- tion page that follows 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 after receiving copies of the shipping receipts.

  • Page 21: Nature Of Problem

    Power Base Series Power Amplifiers 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: _____________________________ Model: ________________________ Serial Number: ______________ Purchase Date: ___________ (Be sure to describe the conditions that existed when the problem occurred and what attempts were made to correct it.)

This manual is also suitable for:

Power base 2Power base 3Power base-1Power base-2Power base-3

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