AC Current Consumption

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-

Model

 

 

8

 

4

or Distributed Line

 

2

 

IDLE

FULL

1/3

1/8

FULL

1/3

1/8

FULL

1/3

1/8

 

POWER

POWER

POWER

POWER

POWER

POWER

POWER

POWER

POWER

CX4, CX4T

0.4A

6.0A

2.8A

2.5A

10A

4.5A

3.8A

15A

6.8A

5.6A

CX6, CX6T

0.9A

7.9A

4.3A

3.2A

13A

7.5A

5.0A

19A

10A

7.0A

CX12, CX12T

1.0A

15A

8.6A

5.1A

24A

12A

6.5A

33A

17A

8.5A

 

 

 

 

 

 

 

 

 

 

 

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.

Heat Emissions

Model

 

 

 

8

 

4

or Distributed Line

 

2

 

 

IDLE

FULL

1/3

1/8

FULL

1/3

1/8

FULL

1/3

1/8

 

 

POWER

POWER

POWER

POWER

POWER

POWER

POWER

POWER

POWER

 

Btu/hr

110

 

 

490

 

 

765

 

 

1545

CX4, CX4T

 

 

 

 

 

 

 

 

 

 

 

(preliminary)

kcal/hr

28

 

 

123

 

 

193

 

 

389

 

 

 

 

 

 

 

 

 

 

 

 

CX6, CX6T

Btu/hr

250

890

735

735

1630

1655

905

3145

2205

1655

 

 

 

 

 

 

 

 

 

 

 

 

kcal/hr

63

224

185

185

411

417

228

793

556

417

 

 

 

 

 

 

 

 

 

 

 

 

CX12, CX12T

Btu/hr

265

1725

1530

945

3250

2395

1360

5545

3785

2230

 

 

 

 

 

 

 

 

 

 

 

 

kcal/hr

67

435

386

238

819

604

343

1397

954

562

 

 

 

 

 

 

 

 

 

 

 

 

29

Page 30
Image 30
QSC Audio CX Series user manual Heat Emissions

CX Series specifications

QSC Audio, a recognized leader in professional audio solutions, presents the CX Series of amplifiers, a fusion of power, efficiency, and cutting-edge technology designed to meet the demands of various sound reinforcement applications. Known for their reliability and outstanding performance, the CX Series amplifiers are perfect for installations in venues, theaters, and houses of worship, delivering high-quality audio reproduction regardless of the setting.

At the core of the CX Series is its robust Class D amplification. This technology not only ensures excellent audio fidelity but also enhances energy efficiency, resulting in lower operational costs and cooler running temperatures. The amplifiers utilize a linear power supply, which contributes to exceptional audio quality by providing stable and clean power to the components. With varying power ratings, including options ranging from 200 to 1200 watts per channel, the CX Series caters to different venue sizes and specific audio requirements.

The CX Series is engineered with a range of features that enhance usability and performance. Integrated DSP (Digital Signal Processing) allows users to access advanced sound processing algorithms, enabling fine-tuning of audio settings for optimal performance. The amplifiers include comprehensive protection circuitry to safeguard the equipment from thermal overload, short circuits, and signal clipping, ensuring longevity and reliability in demanding environments.

Connectivity is also a significant aspect of the CX Series. The amplifiers are equipped with a variety of input and output options, including XLR, 1/4" TRS, and barrier strip connectors, facilitating seamless integration with a wide range of audio sources and speakers. Moreover, the user-friendly interface includes LCD displays for easy monitoring, making setup and adjustments straightforward for audio engineers and technicians.

Another defining feature of the CX Series is its lightweight design. This portability makes installation and transport easy without compromising on performance. Additionally, QSC’s commitment to sustainability is evident in the design, as the amplifiers are constructed with environmentally friendly materials and have a reduced carbon footprint, aligning with modern practices in eco-conscious audio engineering.

In summary, the QSC Audio CX Series amplifiers blend professionalism with versatility, delivering exceptional performance that satisfies both audio quality and operational reliability. Their innovative technologies and thoughtful design make them a powerful ally for professionals in any sound reinforcement scenario.