Crown Power Line Three Owners Manual

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INSTRUCTION MANUAL

POWER LINE THREE
STEREO AMPLIFIER

CROWN INTERNATIONAL, INC. 1718 W. MISHAWAKA RD. ELKHART, INDIANA 46511

© 1985 Crown Inlemallonal. Inc.

K80087-B
9 /95

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FULL THREE-YEAR WARRANTY

SUMMARY OF WARRANTY

We, CROWN INTERNATIONAL, INC, 1718 West Mishawaka Road, Elkhart, Indiana46517 (Warrantor) warrant
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 (warranty period) that the product is free
of defects in materials or workmanship and will meet or exceed all advertised specifications for such a product.

ITEMS EXCLUDED FROM WARRANTY

We are not responsible for product failure caused by misuse, accident or neglect. This warranty does not extend to any
product on which the serial number has been defaced,altered, or removed. It does not cover damage to speakers or any
other products resulting from Crown product failure. It does not cover defects or damage caused by your use of
unauthorized modifications, pans, or service. It also excludes batteries and damage caused by leaky or defective
batteries.

WHAT WE WILL DO

We will remedy any defect in materials or workmanship 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 component available to Crown 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 or at the Crown factory, We
will remedy the defect and ship the product from the service center or Crown factory within a reasonable time after
receipt of the defective product at the authorized service center or the Crown factory. All expenses in remedying the
defect, including shipping costs in the United States, will be borne by Crown. (Purchaser must bear the expense of
shipping the product between any foreign country and the port of entry in the United States and all taxes, duties, and
other customs fee for such foreign shipments).
HOW TO OBTAIN WARRANTY SERVICE

You must notify us of your need for warranty service not later than ninety (90) days after expiration ofthe warranty
period. We will give you written notice of the dealer service centers to whom you may deliver the product, or we will
give you an authorization to return it for factory service. All components must be shipped in a factory pack, which, if
needed, may be obtained from Crown free of charge. Corrective action will be taken within a reasonable time ofthc
date of receipt of the defective product by us or our service center. Ifthe repairs made by Crown or the authorized
service center are not satisfactory, notify Crown or the authorized service center immediately.

DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES

YOU ARE NOT ENTITLED TO RECOVER FROM US ANY CONSEQUENTIAL OR INCIDENTAL
DAMAGES RESULTING FROM ANY DEFECT IN OUR PRODUCT. THIS INCLUDES ANY DAMAGE TO
ANOTHER PRODUCT OR PRODUCTS RESULTING FROM SUCH A DEFECT. SOME STATES DO NOT
ALLOW THE EXCLUSION OR LIMITATIONS 0F 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, 0R MODIFY THIS WARRANTY. THE
WARRANTY IS NOT EXTENDED BY THE LENGTH OFTIME WHICH YOU ARE DEPRIVED OFTHE USE
OF THE PRODUCT. REPAIRS AND REPLACEMENT PARTS PROVIDED UNDER THE TERMS OFTHIS
WARRANTY SHALL CARRY ONLY THE UNEXPIRED PORTION OF THIS 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 0F PURCHASER

THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER
RIGHTS WHICH VARY FROM STATE TO STATE. No action to enforce this Warranty shall becommenced later
than ninety (90) days after expiration of the warranty period.

CROWN INTERNATIONAL, INC.
1718 West Mishawaka Road, Elkhart, Indiana 46517

THIS STATEMENT OF WARRANTY SUPERSEDES ALL OTHERS CONTAINED IN THIS MANUAL.
12/8]

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crown

8
mm

UNBALANCED SlGN
FROM PREAMPLIFIER

Fig. 34 Typical Stereo Hookup

3.7 Connecting Input/ Output Lines

All input and output connections (except monitor) are
made from the rear panel of the Power Line Three.
Figure 3.4 is a hook-up diagram that may be followed for
most conventional stereo systems.

It is always wise to remove power from the unit and turn
the Input Level Controls fully counterclockwise while
making connections, especially if the load is a speaker.
This will eliminate any chance of loud blasts. Crown is
not liable for damage incurred to any transducer due to
its being overpowered!

When connecting input lines, use the standard pinjacks.

Connecting the inputs will require observance of three
basic precautions: undesirable signals to the inputs,
ground loops, and feedback from the output(s) to
input(s).

For loudspeaker-driving applications, the input should
be free of large sub-sonic or undesired low frequencies, as
they could cause unnecessary activation of the Low
Frequency Interrupt circuitry. A simple visual test for
DC on the inputs is to slowly turn up the Input Level
control with the amp turned on, and then watch for
displacement of the loudspeaker cone. If very much
movement is observed or if the units Low Frequency
Interrupt circuitry activates and causes the unit to go into
the stand-by mode (IOC lit), the DC content may be
excessive and may require the use of an input blocking

capacitor. Only a low leakage type paper, mylar or
tantalum capacitor should be used for this purpose.

A second precaution is ground-loops - electronic
jargon for undesirable circulating circuits flowing in a
grounding system. A common form of loop (possibly
resulting in hum at the output) is a pair of input cables
whose area is subjected to a magnetic field. In practice,
both cables should be tied together along their length,
and away from power cords. Tying the input and output
grounds together may also form a ground loop.

A third precaution is feedback oscillation from AC
power lines. Proper grounding and isolation of inputs of
common AC line devices is a good practice.

Output connectors should be of such a type to reliably
handle the units output signal. One type of output
connector is available for use on the Power Line
Three: MDP banana type jacks. Since banana plugs are
used, care should be taken so that the connector is kept
snug fitting as frequent plugging and unplugging will
loosen the connector.

The gauge and length of speaker cable is directly
proportional to the resistance; as the wire diameter
decreases (higher gauge number) and/ or the length
increases, the resistance rises. Because an increase in
cable resistance effectively increases the source
impedance of the amplifier (as seen by the speaker), the
cable affects the damping factor (see Glossary of Terms).
Figmre 3.5 is a nomograph which illustrates the
relationship between load impedance, damping factor,
wire gauge and length.