Crown Power Line Two Owners Manual

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crown®

INSTRUCTION MANUAL ,

POWER LINE TWO
STEREO AMPLIFIER

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CI'OLUI'I

INSTRUCTION MANUAL

POWER LINE TWO
STEREO AMPLIFIER

i @ CROWN INTERNATIONAL, INC. 1718 W. MISHAWAKA RD. ELKHART. INDIANA 46517

© 1984 Cmvm Inlemuuoml, Inc.
[(800884
12/84

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TABLE OF CONTENTS

Section 1 General Information

1.1 Introduction/ Purpose of Equipment ................................................ 1-1 a
1.2 Features .......................... . . 1-1
1.3 Service Policies ................................................. . . . . . .. 1-1
1.4 Glossary of Terms ............................................................... 1-2
Section 2 Specifications and Performance
2.1 General Specifications ............................................................ 2-1 ;
2.2 Monaural Specifications ................................ . . . . . . . . . . . 2-1 E
2.3 Stereo Specifications ............................................................ i
2.4 Performance Graphs ........
Section 3 Installation and Operation
31 Unpacking ...................................................................... 3-1
3.2 Accessories Supplied .......................................... l
3.3 Mounting .................. 1
3.4 Operating Precautions ....... l
3.5 Controls and Adjustments . . .
3.6 Connecting AC Power .......
3.7 Connecting Input/Output Lines.
3.8 Mono Operation .............. . . . . g
3.9 Protection Mechanisms ............... E
3.10 Load Protection Methods ............. .... ... .
3.11 Cleaning ........................................................................ 3-8
Section 4 Technical Information E
4.1 General Information ........................................................ 4-1 a A
4.2 Block Diagram Circuit Theory ..................................................... 4-]
LIST OF ILLUSTRATIONS
Fig. 1.1 Power Line Two Stereo Amplifier .................................................. l-l
Fig. 2.1 Nominal Crosstalk .............. . . .. .... .... i
Fig. 2.2 Nominal Output Impedance ................................. E
Fig. 2.3 Nominal Damping Factor.. E
Fig. 2.4 Nominal Noise Spectrum ..
Fig. 2.5 Nominal Phase Spectrum . . . . . . i
Fig. 2.6 Nominal Power Efficiency .......
Fig. 2.7 Frequency Response ......
Fig. 2.8 Output Phase Angle. . . . ..................................................... 2-6
Fig. 3.1 Mounting Dimensions ............................................................ 3-2 E
Fig. 3.2 Power Line Two Front Panel ......................... . . . . . . . . ...... 3-3 E
Fig. 3.3 Power Line Two Rear Panel ................................................... 3-3 3
Fig. 3.4 Typical Stereo Hookup ...................................................... 34
Fig. 3.5 Banana (MDP) Plug ........................................................ 3-5
Fig. 3.6 Source Resistance and Damping Factor vs. Length and Size of Output Leads ............ 3-6
Fig. 3.7 Typical Mono Hookup ........................................................... 3-6
Fig. 3.8 Fuse Selector Nomograph for Loudspeaker Protection. . . ...... 3-7
Fig. 3.9 Relay Controlled Protector with Overload Indicator ............................... 3-8
Fig. 4.1 Power Line Two Block Diagram ................................................... 4-2 @

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Crosstalk: Signal leakage from one signal source into
anotherl

Damping: Controlling of vibrations, response, or
resonances which if unchecked, would cause coloration
of the sound.

Damping Factor: A numerical indication of an
amplifiers ability to decrease unwanted loudspeaker
movements. Damping factor can be found by dividing
the load impedance by the amplifiers output impedance.

Decibel: A numerical expression of acoustic orelectrical
ratios, such as the relative intensity of a sound or the
relative strength of a signal. One (dB) is about the
smallest change in sound perceptible to the ear.

Decoder: A matrix of logic elements that selects one or
more output channels according to the combination of
input signals present. Can be used in FM to recover
stereo signals of a stereo encoded multiplex
transmisssion.

De-emphasis: In FM signals, restoring the pre-
emphasized (for proper transmission characteristics)
signal to result in a flat frequency response curve.

Distortion: Unwanted noise, or sounds which didnt
exist in the studio when the original recording was made.
Harmonic distortion produces tones harmonically
related to a single, pure tone. Intermodulation distortion
(IM) introduces new tones caused by mixing of two or
more original tones. Phase distortion, or non-linear
phase shift, disturbs timing sequence between a tone and
its related overtones. Distortion which creates new
spectra are expressed in percentages and phase distortion
in degrees of phase shift or seconds of group delay vs.
frequency errors.

Dynamic Range: The difference between the most
intense and the least intense levels in a sound system.

Equalization: Frequency response manipulation to meet
the requirements of recording, and an inverse
manipulation on playback to restore the original. Also
known as compensation for acoustic problems of
listening rooms.

Feedback: Sending a part of a systems output back to
the input. Positive feedback may lead to unstable
conditions such as PA system howling due to sound
from the speakers being fed back thru the microphone

and amplified again. Another form is low frequency
interference created when vibrations from loudspeakers
are picked up by the cartridge and amplified again.
However, carefully controlled negative feedback in
electronic circuits can be used to help reduce distortion
and control stability.

Flutter: Rapid variation in the speed of a turntable or
tape transport. Flutter causes a wavering of musical
pitch.

Frequency Response: This term indicates any amplitude
variations in a system output signal with respect to
frequency. This measurement is made with a constant
level input signal.

Gain: The ratio of an amplifers output voltage to its
input voltage.

Headroom: Stated in dB, headroom is the difference
between the signal level and the limits of the sound system
ie; the ratio of power available to power used

Hertz: As in-cycles-per-second, not rental agency.

High Pass/ Low Pass Filter: High pass - a filter having a
single transmission band extending from some critical, or
cutoff, frequency other than zero, up to infinite
frequency. Low pass - a filter network which passes all
frequencies below a specified frequency with little or no
loss but discriminates strongly against higher
frequencies

IF: An Intermediate Frequency is afrequency to which a
signal wave is shifted locally as an intermediate step in
FM transmission or reception.

Image Response: Response of a superheterodyne
receiver to the image frequency, as compared to the
response to the desired frequency:

Input Sensitivity: The input voltage required to drive an
amplifier to its rated output.

10C: Stands for Input-Output Comparator. An
extremely sensitive Crown circuit used to indicate, via a
front panel LED, the fact that the operating limits of an
amplifier are being exceeded resulting in output non-
linearity.

LED: Light Emitting Diode. A PN junction that emits
light when biased in the forward direction.