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X s   S E R I E S
Xs 4300
AC Power Draw and Thermal Dissipation
This document provides detailed information about the amount of power 
Here are the equations used to calculate the data presented in Figure 1:
and current drawn from the AC mains by the Crown® Xs 4300 amplifi er and 
the amount of heat produced under various conditions. The calculations 
presented here are intended to provide a realistic and reliable depiction 
of the amplifiers. The following assumptions or approximations were 
made:
The quiescent power draw of 90 watts is a maximum value and includes 
• The amplifi er’s available channels are loaded, and full power is being 
power drawn by the fan. The following equation converts power draw in 
delivered.
watts to current draw in amperes:
•  Effi ciency at standard 1 kHz power into 4 ohms is 55.5%.
•  Quiescent power draw is 38.1 W. 
• The estimated duty cycles take into account the typical crest factor for 
each type of source material.
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 
•  Duty cycle of pink noise is 50%.
voltage and current. The following equation is used to calculate thermal 
•  Duty cycle of highly compressed rock ‘n’ roll midrange is 40%.
dissipation:
•  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%.
The value used for ineffi 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:
Xs 4300
Xs 4300
L O A D
2 Ohm Stereo
4 Ohm Stereo
8 Ohm Stereo
AC 
Current Draw 
Thermal 
Current Draw 
Thermal
Current Draw 
Thermal
AC 
AC 
Mains 
(Amps)
Dissipation
(Amps)
Dissipation
(Amps)
Dissipation
Mains 
Mains 
Duty
Power 
Power 
Power 
Cycle
Draw 
120V
230V
Draw 
Draw 
btu/hr
kcal/hr
120V
230V
btu/hr
kcal/hr
120V
230V
btu/hr
kcal/hr
(W)
(W)
(W)
50%
1119
14.3
7.5
1773
447
759
9.7
5.1
1225
309
40%
903
11.6
6.0
1444
364
615
7.9
4.1
1006
254
30%
687
8.8
4.6
1116
281
471
6.0
3.1
787
198
20%
471
6.0
3.1
787
198
326
4.2
2.2
568
143
10%
254
3.3
1.7
459
116
182
2.3
1.2
349
88
Figure 1  Power Draw, Current Draw and Thermal Dissipation at Various Duty Cycles
Crown International, Inc.
P.O. Box 1000
Elkhart, IN 46515-1000
TEL: 574-294-8200
FAX: 574-294-8FAX
www.crownaudio.com
For more details refer to the applicable Operation Manual or 
contact Crown Factory Service. The provided data should not be 
construed as specifi cations.
Crown is a registered trademark of Crown International, Inc. 
Printed in U.S.A.
© 2003 Crown Audio, Inc.
04/03                                                            135178-1  
 


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