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MA-24x6
The information provided on this page is calculated data based on driv-
ing both channels to rated output using the 1 kHz Maximum Average
Power rating method.
Other parameters used in calculation include a conservative idle current
estimate of 90 watts and a conservative estimate of effeciency at 65%.
Information is provided only for getting an idea of current draw and heat
produced. Actual performance will vary depending on environment, pro-
gram material, load, signal, and AC mains voltage and frequency.
Values of calculated current draw are intended to represent average draw
corresponding to the thermal breaker requriements that should be met to
handle the amplifier as a load on the AC mains.
Peak current draw with dynamic program material may be significantly
higher. Thermal information is provided to assist with calculating air
conditioning needs. The data here should not be construed as specifica-
tions.
Duty cycle of various program material:
Individual speech: 10%
Acoustic/chamber music: 20%
Full-range rock music: 30%
Compressed rock music: 40%
Pink noise: 50%
2 Ohm Stereo / 4 Ohm Bridge
AC
Current Draw
Mains
Duty
(Amps)
Power
Cycle
Draw
120V
230V
(watts)
50%
1205
12.1
6.1
40%
982
9.9
5.0
30%
759
7.7
3.8
20%
536
5.4
2.7
10%
313
3.2
1.6
M A C R O - T E C H S E R I ES
AC Power Draw and Thermal Dissipation
Macro-Tech 24x6
4 Ohm Stereo / 8 Ohm Bridge
AC
Current Draw
Thermal
Mains
(Amps)
Dissipation
Power
Draw
btu/hr
kcal/hr
120V
(watts)
1650
416
955
11.2
1375
347
782
9.1
1100
277
609
7.1
840
212
436
5.0
575
145
263
3.0
A Harman International Company
Crown International, Inc.
1718 W. Mishawaka Rd.
Elkhart, IN 46517-9439
TEL: 574-294-8200
FAX: 574-294-8FAX
www.crownaudio.com
Here are the equations used to calculate the data presented in Figure 1:
Total output power with all
channels driven (watts)
AC Mains Power
=
Draw (watts)
The quiescent power draw is a maximum value and includes power drawn by the fan. The
following equation converts power draw in watts to current draw in amperes:
Current Draw
(amperes)
The value used for Power Factor is 0.83. The Power Factor variable is needed to compen-
sate for the differnece in phase between the AC mains voltage and current. The following
equation is used to calculate thermal dissipation:
(
Total output power with all
Thermal
channels driven (watts)
Dissipation
=
(btu/hr)
Amplifier Efficiency (.65)
The value used for inefficiency is 1.00-efficiency. 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:
(
Total measured output power
Thermal
from all channels (watts)
Dissipation
=
(btu/hr)
Amplifier Efficiency (.65)
LOAD
AC
Thermal
Mains
Dissipation
Power
Draw
230V
btu/hr
kcal/hr
(watts)
5.6
1525
384
663
4.6
1300
328
548
3.6
1050
265
434
2.5
800
202
319
1.5
550
139
205
For more details refer to the applicable Operation
Manual or contact Crown Factory Service. The
provided data should not be construed as specif-
ciations.
Crown and Crown Audio® are registered trade-
marks of Cown international, Inc. Printed in
U.S.A.
©2005 Crown Audio, Inc.
04/05
x Duty
Cycle
+ Quiescent Power
Draw (watts)
Amplifier Efficiency (.65)
AC Mains Power
Draw (watts)
=
AC Mains
Power
x
Voltage
Factor (.83)
)
x Duty
.35
x
Quiescent Power
Cycle
+
Draw (watts)
)
x
.35
Quiescent Power
+
Draw (watts)
8 Ohm stereo / 16 Ohm Bridge
Current Draw
Thermal
(Amps)
Dissipation
120V
230V
btu/hr
kcal/hr
6.8
3.4
1000
5.6
2.8
875
4.4
2.2
725
3.3
1.7
600
2.1
1.1
450
138356-1
x 3.415
x 3.415
252
871
182
151
113
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