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Page 29Reference Manual

Macro-Tech

24x6 & 36x12 Power Amplifiers

Fig. 7.2 Macro-Tech 36x12 Power Draw, Current Draw and

Thermal Dissipation at Various Duty Cycles

7 AC Power Draw and

Thermal Dissipation

This section provides detailed information about the

amount of power and current drawn from the AC mains

by the Macro-Tech 24x6 and 36x12 amplifiers 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 fol-

lowing assumptions or approximations were made:

• The amplifier’s available channels are loaded and full

power is being delivered.

• The amplifier efficiency at standard 1 kHz power is

estimated to be 65%.

• Quiescent power draw is 90 watts (an almost negli-

gible amount for full-power calculations).

• Quiescent thermal dissipation equals 105 btu/hr at

90 watts.

• The estimated duty cycles take into account the typi-

cal crest factor for each type of source material.

• Duty cycle of pink noise is 50%.

• Duty cycle of highly compressed rock ‘n’ roll mid-

range 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 pre-

sented in Figures 7.1 and 7.2:

AC Mains Power

Draw (watts)

Total output power will all

channels driven (watts)

Duty

Cycle

Amplifier Efficiency (.65)

Quiescent Power

Draw (watts)

The quiescent power draw of 90 watts is a maximum

value and includes power drawn by the fan. The follow-

ing equation converts power draw in watts to current

draw in amperes:

Current Draw

(amperes)

AC Mains Power

Draw (watts)

AC Mains

Volta

Power

Factor

(

.83

)

The power factor of 0.83 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:

Total output power with all

channels driven (watts)

Thermal

Dissipation

(btu/hr)

Quiescent Power

Draw (watts)

Duty

Cycle

Amplifier Efficiency (.65)

()

3.415

.35

The constant 0.35 is inefficiency (1.00–0.65) and the

factor 3.415 converts watts to btu/hr. Thermal dissipa-

tion in btu is divided by the constant 3.968 to get kcal. If

you plan to measure output power under real-world con-

ditions, the following equation may also be helpful:

Total measured output power

from all channels (watts)

Thermal

Dissipation

(btu/hr)

Quiescent Power

Draw (watts)

.35

Amplifier Efficiency (.65)

()

3.415

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