Crown Audio 4300 User Manual

Xs SERIES

Xs 4300

This document provides detailed information about the amount of power
and current drawn from the AC mains by the Crown

AC Power Draw and Thermal Dissipation

®

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 amplifi er’s available channels are loaded, and full power is being

delivered.

• 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.

• 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 quiescent power draw of 90 watts is a maximum value and includes
power drawn by the fan. 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 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

AC

Duty

Cycle

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

Mains
Power

Draw

(W)

Current Draw

(Amps)

120V 230V

Thermal

Dissipation

btu/hr kcal/hr

AC
Mains
Power

Draw

(W)

Current Draw

(Amps)

120V 230V

Thermal

Dissipation

btu/hr kcal/hr

AC
Mains
Power

Draw

(W)

8 Ohm Stereo

Current Draw

(Amps)

120V 230V

Thermal

Dissipation

btu/hr kcal/hr

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: [phone]
FAX: [phone]FAX
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