Crown CH1 Supplementary Manual

Crown International, Inc.
P.O. Box 1000
Elkhart, IN 46515-1000
TEL: 219-294-8200
FAX: 219-294-8FAX
www.crownaudio.com
CH1
08/00                                                            131512-1    
For more details refer to the applicable Reference Manual or 
Contact Crown Audio Technical Support. The provided data 
should not be construed as specications.
Crown is a registered trademark of Crown International, Inc. 
Printed in U.S.A.
© 2000 Crown International, Inc.
AC Power Draw and Thermal Dissipation
C O N T R A C T O R   S E R I E S
This document provides detailed information about the amount of power 
and current drawn from the AC mains by the CH1 amplier and the 
amount of heat produced under various conditions. The calculations pre-
sented here are intended to provide a realistic and reliable depiction of 
the amplier. The following assumptions or approximations were made:
•    The  amplier’s  available  channels  are  loaded  and  full power  is  being 
delivered.
•    The  amplier  efciency  at  standard  1-kHz  power  is  estimated  to  be 
65%.
•    Quiescent power draw is approximately 60 watts.
•    When  running  at  full  speed,  typical  power  draw  for  the  internal  fan 
is 12 watts or less.
•    The estimated duty cycles take into account the typical crest factor for 
each type of source material.
•    Duty cycle of pink noise is 50%.
•    Duty cycle of highly compressed rock ‘n’ roll midrange is 40%.
•    Duty cycle of rock ‘n’ roll is 30%.
•    Duty cycle of background music is 20%.
•    Duty cycle of continuous speech is 10%.
•    Duty cycle of infrequent, short duration paging is 1%.
Here are the equations used to calculate the data presented in Figure 1:
The following equation converts power draw in watts to current draw in 
amperes:
The value used for Power Factor is 0.83. The Power Factor variable is 
needed to compensate for the difference in phase between the AC mains 
voltage and current. The following equation is used to calculate thermal 
dissipation:
The value used for inefciency is 0.35 (1.00–0.65). The factor 3.415 
converts watts to btu/hr. Thermal dissipation in btu is divided by the 
constant 3.968 to get kcal. If you plan to measure output power under 
real-world conditions, the following equation may also be helpful:
Figure 1  Power Draw, Current Draw and Thermal Dissipation at Various Duty Cycles

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