Crown DC-300A II Reference Manual
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Crown DC-300A II Reference Manual

Crown dc-300a ii: reference guide
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See also: Service Manual , Wiring Diagram
DC-300A II
CHANNEL 1
I0C
CHANNEL 2
POWER
30
30
40
20
40
20
10
10
50
50
0
0
Some models may be exported under the name Amcron .
®
© 1996 by Crown International, Inc., P.O. Box 1000, Elkhart, Indiana
46515-1000 U.S.A. Telephone: 219-294-8000. The DC-300A II is
produced by the Professional Audio Division of Crown International,
Inc. Trademark Notice: Amcron
®
, Crown
®
, Com-Tech
®
, IOC
®
, IQ
System
®
and Macro-Tech
®
are registered trademarks of Crown
®
International, Inc. Other trademarks are the property of their respective
Applies only to
owners.
120 VAC North
American units.
K80002D9
5/96

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Summary of Contents for Crown DC-300A II

  • Page 1 POWER Some models may be exported under the name Amcron . ® © 1996 by Crown International, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 219-294-8000. The DC-300A II is produced by the Professional Audio Division of Crown International, Inc.

  • Page 2: North America

    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

    Nor does it cover every possible situation which may arise during installation, operation or main- tenance. 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.

  • Page 4: Table Of Contents

    7.2 Changing the Input Sensitivity to 0.775 V ... 23 8 Service ... 24 8.1 Worldwide Service ... 24 8.2 North American Service ... 24 8.2.1 Service at a North American Service Center ... 24 8.2.2 Factory Service ... 24 Page 4 CONTENTS DC-300A II Power Amplifier...
  • Page 5 DC-300A II Power Amplifier DC-300A II ... 7 Facilities ... 8 Mounting Dimensions ... 9 System Connection ... 10 Input Wiring ... 11 Subsonic Filter Capacitors ... 11 Unbalanced RFI Filters ... 11 Balanced RFI Filters ... 11 Wire Size Nomograph ... 12 Inductive Load (Transformer) Network ...

  • Page 6: Dc-300A Ii

    DC-300A II Power Amplifier Rev. 0 Page 6...

  • Page 7: Welcome

    It is a versatile choice for use in studios, laboratories, public facilities and on the road. And the sonic excellence of the DC-300A II makes it a very good choice for your personal listening pleasure.

  • Page 8: Facilities

    This indicator glows when the amplifier is turned on. B. Power Switch This push button turns the DC-300A II on and off. The unit has no turn-on delay and minimal thumps. Always turn the amplifier on last so the turn-on transients of other components will not be amplified.

  • Page 9: Installation

    3.3 Wiring Figure 3.2 depicts three of the most common ways to install a DC-300A II in a sound system. All input and output jacks are located on the back panel. Please use care in making connections, selecting signal sources and controlling the output level.

  • Page 10: System Connection

    INTERNATIONAL, INC. ELECTRONIC EQUIPMENT ELKHART, IN 46517 0000 MADE IN U.S.A. 000000 SERIAL NUMBER DC-300A II AMP DUAL MONO Fig. 3.2 System Connection DC-300A II Power Amplifier – CHANNEL 1 LINE – CHANNEL 1 (+) LINE – CHANNEL 1 LINE...

  • Page 11: Input Connection

    DC-300A II Power Amplifier outputs will receive the channel 1 input. The channel 2 output is inverted so it can be bridged with channel 1. There are two different ways to connect Bridge-Mono wiring. The most common method is to connect the...

  • Page 12: Output Connection

    3.3.3 Output Connection Consider the power-handling capacity of your load be- fore connecting it. Crown is not liable for damage in- curred at any time due to a load being overpowered. The use of loudspeaker protection fuses is highly rec- ommended (see Section 3.3.4).

  • Page 13: Additional Load Protection

    DC-300A II Power Amplifier 3. Draw a line through the two points with a pencil, and continue until it intersects the “Source Resistance” line. 4. On the “2-Cond. Cable” line, mark the length of cable run. 5. Draw a pencil line from the mark on the “Source Resistance” line through the mark on the “2-Cond.

  • Page 14: Ac Mains Power Requirement

    All units have a standard three wire, grounded AC cord and plug as specified by UL requirements for North American 120 VAC, 60 Hz units. Note: Crown assumes no liability whatsoever for ungrounded operation, nor for violation of UL or local electrical codes.

  • Page 15: Operation

    DC-300A II Power Amplifier 4 Operation 4.1 Precautions Your amplifier is protected from all external faults. Even so, you should take the following precautions: 1. When the level of an input source is uncertain, or an audio component has not been previously...

  • Page 16: Fuse Replacement

    Replace the fuse with a 10 amp, 250 volt, type AB fuse for units operating with an AC mains voltage less than 200 volts, or a 5 amp, 250 volt, type MTH fuse for units operating with an AC mains voltage of 200 volts or more.

  • Page 17: Technical Information

    The DC-300A II gives you the highest quality in both circuitry and components. It should provide you with a lifetime of trouble-free service. Page 17...

  • Page 18: Specifications

    Power Efficiency: See Figure 6.7. Power Requirements: Requires 50 to 400 Hz AC with Page 18 DC-300A II Power Amplifier selectable transformer taps for 100, 120, 200, 220 and 240 VAC (±10%) operation. Draws 40 watts or less at idle and 500 watts at rated power.

  • Page 19: Power Matrix

    When measuring power, 0.1% THD appears to be the industry standard for distortion. One of the maximum average power columns shown in the power matrix is measured when THD rises to 0.1% so you can easily compare Crown specifications to those of other manufacturers. But this high level of distortion actually allows for some clipping which is undesirable.

  • Page 20: Nominal Output Impedance

    10000 1000 TO DC Page 20 FREQUENCY (Hz) Fig. 6.2 Nominal Output Impedance FREQUENCY (Hz) FREQUENCY (Hz) Fig. 6.4 Nominal Damping Factor (8 ohms) DC-300A II Power Amplifier 10 K 100 K 10 K 100 K 10 K 100 K...

  • Page 21: Nominal Phase Response

    DC-300A II Power Amplifier –15 Phase Shift (degrees) –30 –45 –60 –60 –80 –100 –120 Fig. 6.6 Nominal Crosstalk (Channel 1 at 150 watts and Channel 2 at Maximum Output) EFFICIENCY SINGLE CHANNEL DRIVEN BOTH CHANNELS DRIVEN Fig. 6.7 Nominal Power Efficiency (120 VAC Mains and Both Channels Driven) FREQUENCY (Hz) Fig.

  • Page 22: Nominal Noise Spectrum

    Fig. 6.9 Nominal Frequency Response (16 ohms at 0.5 watts, Page 22 FREQUENCY (Hz) Fig. 6.8 Nominal Noise Spectrum FREQUENCY (Hz) 8 ohms at 1 watt and 4 ohms at 2 watts) DC-300A II Power Amplifier 10 K 100 K 16 ohms 8 ohms 4 ohms...

  • Page 23: Internal Settings

    7 Internal Settings From the factory, your amplifier is configured for an in- put sensitivity of 26 dB gain. For the DC-300A II, this setting requires an input signal of 1.75 volts (±2%) to drive the amplifier to full output. You may optionally con- figure the unit for an input sensitivity of 0.775 volts (0...

  • Page 24: 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 fac- tory. For warranty service, we will pay for ground ship- ping both ways in the United States after receiving copies of the shipping receipts.
  • Page 25 DC-300A II Power Amplifier Crown Factory Service Information Shipping Address: Crown International, Inc., Factory Service, 57620 C.R. 105, Elkhart, Indiana 46517 Phone: 1-800-342-6939 or 1-219-294-8200 Fax: 1-219-294-8301 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.)

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