Crown MA-5002-VZ Brochure
M A C R O - T E C H® S E R I E S
8 Ohm Stereo / 4 Ohm Parallel-Mono
L O A D
50%
40%
30%
20%
10%
1,881
1,523
1,164
806
448
1,793
1,491
1,189
887
584
2,845
2,294
1,743
1,192
641
657
540
423
305
189
3,534
2,845
2,156
1,467
779
3,187
2,606
2,026
1,445
864
22.7
18.3
14.0
9.7
5.4
34.3
27.6
21.0
14.4
7.7
42.6
34.3
26.0
17.7
9.4
Duty
Cycle
AC Mains
Power
Draw
(Watts)
btu/h r
Current Draw (Amps)
10.3
8.3
6.4
4.4
2.5
15.6
12.6
9.5
6.5
3.4
19.4
15.6
11.8
8.0
4.3
4 Ohm Stereo / 8 Ohm Bridge-Mono / 2 Ohm Parallel-Mono 2 Ohm Stereo / 4 Ohm Bridge-Mono / 1 Ohm Parallel-Mono
Macro-Tech 5002VZ
452
376
300
224
147
kcal/ hr
2,606
2,142
1,677
1,212
748
803
657
511
364
218
100-120 V 220-240 V
Thermal Dissipation
btu/h r
Current Draw (Amps)
kcal/ hr100-120 V 220-240 V
Thermal Dissipation
btu/h r
Current Draw (Amps)
kcal/ hr100-120 V 220-240 V
Thermal Dissipation
AC Mains
Power
Draw
(Watts)
AC Mains
Power
Draw
(Watts)
MA-5002VZ
AC Power Draw and Thermal Dissipation
This document provides detailed information about the amount of power
and current drawn from the AC mains by the Macro-Tech 5002VZ
amplier and the amount of heat produced under various conditions.
The calculations presented here are intended to provide a realistic
and reliable depiction of the amplier. The following assumptions
or approximations were made:
• The amplier’s available channels are loaded and full power is being
delivered.
• The amplier efciency at standard 1-kHz power is estimated to be
73%.
• Quiescent power draw is approximately 90 watts, and assumes the
cooling fans are not running.
• Quiescent thermal dissipation equals 105 btu/hr at 90 watts.
• 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 inefciency is 0.27 (1.00–0.73). 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
08/00 131510-1
Crown International, Inc.
P.O. Box 1000
Elkhart, IN 46515-1000
TEL: 219-294-8200
FAX: 219-294-8FAX
www.crownaudio.com
For more details refer to the applicable Reference Manual or
Contact Crown Audio Technical Support. The provided data
should not be construed as specications.
Crown and Macro-Tech are registered trademarks of Crown
International, Inc. Printed in U.S.A.
© 2000 Crown International, Inc.
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