5 . 0C o n t r o l o p e r a t i o n

a. Power Switch

Pressing this switch so that the white dot is closest to the front panel signals to the microprocessor that the user wishes to turn on the power supply. Note that the microprocessor will only switch the power supply on once it has assured that there are no internal faults. From the first application of AC power it

takes approximately 7 seconds to complete these tests. During

the test time the microprocessor will flash both the TEMP lights and the FAULT light once a second. If the amplifier has already completed these tests, then when the switch is pressed, power up will occur within 1 second. While the power up sequence is being completed all amplifiers channels are muted.

b. Level controls 1 and 2

These controls allow the user to change the sensitivity, or the level required to drive each channel of the amplifier into clip, from approximately +90dBu with the controls fully counter clockwise, to +1dBu with the controls full clockwise. +1dBu equals approximately 870mV RMS and this level will be just sufficient with a 4 Ohm load and nominal AC voltage to drive the amplifier into clip. If the amplifier is operated in bridge mode, use the channel 1 level control only, the channel 2 control has no effect.

Supplied with each PULSE amplifier are special blanking plugs that may be fitted after the control knobs have been pulled off thus allowing the levels to be set and then made tamper proof.

c. Bridge switch

Located on the rear panel, this switch enables bridge mode operation. Activation of this switch is indicated by the Bridge indicator on the front panel.

When the amplifier is operated in bridge mode, the power available doubles allowing larger speakers to be driven. Two things must be kept in mind when bridge mode is used, namely the minimum impedance that can be driven increases from 2 ohms to 4 ohms and if binding post outputs are used, the speaker wiring must be changed as described in the Audio Connections section of this manual.

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Crown Audio 21100 user manual 0C o n t r o l o p e r a t i o n Power Switch, Level controls 1, Bridge switch
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21100 specifications

Crown Audio 21100 is a high-performance power amplifier that has become a staple in the professional audio industry, revered for its reliability and sound quality. Designed for both live sound and fixed installation applications, this amplifier is particularly noted for its robust build and impressive technical capabilities.

One of the standout features of the Crown 21100 is its power output. With the ability to deliver an impressive wattage, it ensures that sound is not only loud but clear, making it ideal for a range of environments, including concert venues, theaters, and public address systems. The amplifier is capable of driving multiple speaker configurations without distortion, providing both headroom and clarity at high volumes.

In terms of technology, the Crown 21100 employs the patented Class I technology, which is known for its high efficiency and low heat generation. This means that the amplifier can operate for extended periods without overheating, making it especially suitable for demanding applications. Additionally, the Crown 21100 is equipped with advanced protection circuitry that guards against short circuits, thermal overload, and input signal clipping, ensuring longevity and reliability in various settings.

Another notable characteristic is the amplifier's versatility in connection options. The Crown 21100 is designed with multiple input configurations, including XLR and 1/4-inch TRS connectors, making it compatible with a wide array of audio sources. Furthermore, its balanced inputs help to minimize noise and interference, ensuring that the sound quality remains pristine even in challenging environments.

Crown Audio also places a significant emphasis on ease of use. The 21100 features intuitive front panel controls and indicators, which allow audio engineers to monitor levels and make adjustments quickly and efficiently. This user-friendly design is particularly beneficial during live performances, where quick decision-making is crucial.

In addition, the amplifier's rugged construction ensures that it can withstand the rigors of touring and extensive use. Its durable chassis is designed to resist the wear and tear associated with transport and installation, making the Crown 21100 a reliable choice for both rental companies and sound professionals.

In conclusion, the Crown Audio 21100 stands out in the competitive landscape of power amplifiers with its powerful output, advanced technology, versatile connectivity, user-friendly design, and rugged reliability. These features make it an exceptional choice for those seeking high-quality audio performance in professional settings.
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