The Class-I Amplifier

amount. Class-I uses symmetrical interleaved PWM, meaning both the leading edges and trailing edges of the pulse are varied according to the amplitude of the signal, and the spacing between pulse centers remains constant. Both the positive and negative switch pulses remain aligned on-center, and the net output current is positive.

Class-I Switches, Positive Signal

Likewise, to produce a negative output signal, the output of the negative switching device is increased in duty while the positive switching device is decreased by the same amount. Again, both switch pulses remain aligned on-center, and the net output current is negative.

Class-I Switches, Negative Signal

The result of using interleaved PWM is that by operating the switching devices at 250 kHz, the signal is effectively modulated at 500 kHz since both the leading and trailing edges of each pulse contribute to the output ripple current. This arrangement further increases efficiency, since switching losses are effectively halved by operat- ing the switching devices at 250 kHz, rather than at 500 kHz as would be necessary with class-D designs to achieve the same effective sampling of the waveform.

Class-I amplifiers also have all of the nearly ideal power converter attributes of class-D PWM amplifiers, in that reactive loudspeaker loads are easily driven. The reac-

tive energy returned from the loudspeaker to the ampli- fier is reabsorbed and output again to the loudspeaker with little loss. Non-switching, dissipative amplifiers are forced to dissipate all of the returned energy and more in the form of heat. This means class-I amplifiers are louder than other amplifiers with comparible power specs, yet they stay much cooler, and can be lighter since they don’t need nearly as much mass for heat dissipation.

Class-I Amplifier

Reactive Energy

Dissipative Amplifier

Reactive Energy

Reactive Energy Returned to Amplifier

From Loudspeaker

With it’s rock-solid reliability, high quality audio repro- duction and unmatched efficiency, Crown’s patented class-I technology creates a totally new paradigm for amplifier design that represents the future of profes- sional amplifiers.

Crown Audio, Inc.

P.O. Box 1000

Elkhart, IN 46515-1000

TEL: 219-294-8200

FAX:219-294-8FAX

www.crownaudio.com

Trademark Notice:

Crown® and BCA® are registered trademarks of Crown International. Printed in U.S.A.

137234-1

12/03

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Crown Audio manual Class-I Switches, Positive Signal, Class-I Switches, Negative Signal
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Class-I specifications

Crown Audio, a leader in professional audio amplification, introduced the Crown Audio Class-I series as part of its commitment to delivering high-quality sound solutions for various applications. The Class-I amplifiers exemplify innovation in audio technology, combining advanced features with reliable performance.

One of the standout characteristics of Crown Audio Class-I amplifiers is their efficient Class-D amplification technology. This approach not only enhances energy efficiency but also reduces heat generation, allowing for a compact design without sacrificing power output. The Class-D circuitry ensures that the amplifiers can deliver high power while maintaining low distortion levels, resulting in crystal-clear sound reproduction.

The Class-I series is designed with versatility in mind. These amplifiers are capable of being used in a wide range of settings, from large concert venues to smaller installations in bars and clubs. With various power ratings available, audio professionals can select the right amplifier for their specific needs, ensuring optimal performance in any environment.

Another notable feature of the Crown Audio Class-I series is the incorporation of advanced DSP (Digital Signal Processing) technology. This technology allows users to customize audio settings and control parameters such as equalization, delay, and limiters, making it easier to fine-tune the sound to suit the venue's acoustics. The intuitive user interface further simplifies the setup process, allowing for quick adjustments during live performances.

In addition to its technological advancements, the Class-I series prioritizes durability. Built with robust materials, these amplifiers are designed to withstand the rigors of everyday use while maintaining consistent performance. The thoughtful thermal management systems incorporated into their design ensure that the amplifiers can operate in demanding conditions without overheating.

Connectivity is another area where Crown Audio excels. The Class-I amplifiers come equipped with multiple input options, including analog and digital formats. This connectivity versatility allows sound engineers to seamlessly integrate the amplifiers into existing audio systems, ensuring a smooth user experience.

Ultimately, Crown Audio Class-I amplifiers stand out in the professional audio landscape due to their combination of cutting-edge technology, flexible design, and practical features. Whether for touring professionals or fixed installations, these amplifiers promise reliable performance and exceptional sound quality, making them a preferred choice for audio engineers worldwide.
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