C O N T R A C T O R S E R I E S

CH4

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 CH4 amplifier and the amount of heat produced under various conditions. The calculations pre- sented here are intended to provide a realistic and reliable depiction of the amplifier. The following 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 77%.

•Quiescent power draw is approximately 140 watts.

•When running at full speed, typical power draw for the internal fan is approximately 12 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 0.98. 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 inefficiency is 0.23 (1.00–0.77). 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

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 specifications.

Crown is a registered trademark of Crown International, Inc. Printed in U.S.A.

© 2000 Crown International, Inc.

08/00

131514-1

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Crown Audio CH4 manual AC Power Draw and Thermal Dissipation, Crown International, Inc Box Elkhart, TEL FAX 219-294-8FAX
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CH4 specifications

The Crown Audio CH4 is a high-performance multi-channel power amplifier designed to deliver exceptional audio fidelity and reliability. With its robust construction and innovative technologies, the CH4 stands out as an ideal solution for professional audio applications, including live sound reinforcement, permanent installations, and broadcast environments.

One of the primary features of the Crown CH4 is its ability to provide four independent amplifier channels, allowing for versatile system configurations. Each channel is capable of delivering an impressive power output, ensuring that even the most demanding audio scenarios can be handled with ease. The amplifier supports a wide range of speaker impedances, making it compatible with various system designs.

The CH4 is equipped with Crown’s DriveCore technology, which combines digital and analog circuitry to enhance overall performance. This innovative approach reduces the size and weight of the amplifier without compromising on power or sound quality. The DriveCore module also optimizes the efficiency of the amplifier, which translates to lower operational costs and reduced cooling requirements.

Another standout characteristic of the Crown CH4 is its comprehensive protection features. The amplifier includes built-in circuitry that safeguards against overheating, short circuits, and overloading, ensuring reliable operation in any environment. Furthermore, the unit boasts advanced signal processing capabilities, allowing for seamless integration with digital audio systems and ensuring pristine audio reproduction.

In addition to its robust performance, the CH4 is designed for ease of use. The onboard LCD display provides real-time monitoring of critical parameters, allowing users to make adjustments quickly. The amplifier also features flexible connectivity options, including XLR inputs and outputs, making it easy to integrate into existing audio setups.

Overall, the Crown Audio CH4 is a powerhouse amplifier that combines cutting-edge technology with user-friendly features. Its combination of power, efficiency, and reliability makes it an excellent choice for professionals looking to elevate their audio systems to new heights. Whether used in a concert hall, a theater, or an installation venue, the CH4 delivers crystal-clear sound and unmatched performance, solidifying its position as a trusted choice in the professional audio industry.
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