QSC CX4T User Manual download pdf (Page 30)

AC CURRENT CONSUMPTION

A major objective in the design of the CX Series amplifiers—even the higher-powered models—is to permit

their operation from readily available, standard AC power sources.

“Normal conditions” in power amplifier rating means operating with a random program source (pink noise), using

pink noise as a source, at an average power level equal to one-eighth of maximum power. This is recognized by

most of the world’s safety agencies as the loudest you can play music through an amplifier and still keep the

incidence of clipping to a reasonable minimum. An amplifier’s peak current draw at full output power into 2 ohms

is several times what the “normal” draw is, but its various protection circuits will prevent this condition from

lasting more than a minute or two.

When you plan the AC power hookups for your amplifiers, use the following table to predict the current

requirements per ampli-

fier. You can use the one-

eighth power figures to

predict the normal continu-

ous current draw, then add

a safety margin to allow

for occasional crescendos.

HEAT EMISSIONS

Essentially, a power amplifier draws electrical energy from the AC mains, converts it to DC, and then converts

it again into an analog of the input signal to send out to the loudspeakers. Any AC power that enters the amplifier

through the power cord and does not exit through the speaker outputs turns into heat, which the amplifier must

rid itself of by exhausting it to the outside. In indoor use, multiple amplifiers may present a sizeable challenge

to a building’s air conditioning system. Use the table below to predict the heat that will be emitted by your

amplifier. Use one-eighth power for normal, continuous usage.

CX4, CX4T

CX6, CX6T

CX12, CX12T

0.4A 6.0A 2.8A 2.5A 10A 4.5A 3.8A 15A 6.8A 5.6A

0.9A 7.9A 4.3A 3.2A 13A 7.5A 5.0A 19A 10A 7.0A

1.0A 15A 8.6A 5.1A 24A 12A 6.5A 33A 17A 8.5A

AC Current Consumption

IDLE

8Ω

FULL 1/3 1/8

POWER POWER POWER

4Ω or Distributed Line

FULL 1/3 1/8

POWER POWER POWER

2Ω

FULL 1/3 1/8

POWER POWER POWER

Model

CX4, CX4T

CX6, CX6T

CX12, CX12T

110 490 765 1545

28 123 193 389

250 890 735 735 1630 1655 905 3145 2205 1655

63 224 185 185 411 417 228 793 556 417

265 1725 1530 945 3250 2395 1360 5545 3785 2230

67 435 386 238 819 604 343 1397 954 562

Heat Emissions

IDLE

(preliminary)

Btu/hr

kcal/hr

Btu/hr

kcal/hr

Btu/hr

kcal/hr

Model

8Ω

FULL 1/3 1/8

POWER POWER POWER

4Ω

or Distributed Line

FULL 1/3 1/8

POWER POWER POWER

2Ω

FULL 1/3 1/8

POWER POWER POWER

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QSC CX4T User Manual Page 30

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