Crown Audio D-45, D-75A Protection, Options Bridge-Mono Option, Input-Sensitivity Option

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D Series Power Amplifiers

4 Advanced Features and Options

NOTE: For detailed information about these Crown amplifier features, please consult the Crown Amplifier Application Guide, available on the Crown website at www.crownaudio.com.

4.1 Protection

Your amplifier is protected against all common hazards that plague high-power amplifiers, including shorted, open or mismatched loads; overloaded power supplies, chain destruction phenomena, input overload and high-frequency blowups.

Protection against shorted and mismatched loads is provided by an instantaneous limiter that automatically limits current to the maxi- mum safe value for the output transistors. With a loudspeaker, you can tell the amplifier has activated load protection because it causes audible distortion. The noise might be com- pared to crossover notch distortion or a snap- ping sound, depending on the load characteristics. Loudspeaker systems with impedances of 4 ohms or higher should not activate the protection system.

All voltage amplification circuitry is designed to limit current. So in the extremely unlikely event of a device failure, the amplifier will prevent fur- ther damage. The input stages are protected from overload damage by series resistors. The unit also features a controlled slew rate and a V-I limiter that protect the amplifier from high- frequency (RF) blowups.

4.2 Options

4.2.1 Bridge-Mono Option

Your amplifier is factory-set for dual (stereo) operation. As an option, you may have the unit configured for higher-power, single-channel, bridge-mono operation. If you want the bridge- mono modification, take the unit to an autho- rized Crown Service Center.

IMPORTANT: Critical differences between dual and mono wiring are described in Section 2.6.2.

4.2.2 Input-Sensitivity Option

The input sensitivity of your amplifier is fac- tory-set to 26 dB gain. As an option, the unit can be set to an input sensitivity of 0.775 volt by an authorized Crown Service center.

For most applications, the amplifier’s default setting of 26 dB gain will be ideal. With this default setting, full output power is achieved with an input signal of 0.632 volts for the D-45, and 0.837 volts for the D-75A.

Some applications may require the gain struc- ture to be calculated based on a sensitivity of 0.775 volts. And although the 26 dB gain set- ting provides a sensitivity for each amplifier that is very near 0.775 volts, the 0.775-volt sensitivity setting is provided for applications that demand this sensitivity with a high level of precision.

A Crown Service Center can activate the 0.775 volt input sensitivity without voiding the war- ranty.

Operation Manual

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Contents Some models may be exported under the name Amcron 75ASeries amplifiers require Class 2 output wiring Important Safety InstructionsWatch for These Symbols Use only with a cart, stand, bracket, or tableDeclaration of Conformity Safety StandardCrown International, Inc European Representative’s Name and AddressTable of Contents How to Use This Manual FeaturesWelcome Detented level controls for precise repeat- abilityUnpack Your Amplifier Install Your Amplifier SetupManual Choose Output Wire and Connectors Choose Input Wire ConnectorsCrown recommends using professionally con- structed, high Bridge-Mono Mode Wire Your System Dual ModeInputs Connect input wiring only to CH Startup Procedure AC Mains Voltage Configura TionConnect to AC Mains Turn up the level of your audio source to an optimum levelOperation PrecautionsFront and Back Views Controls, Indicators and Con- nectorsFuse Replacement IndicatorsControls Options Bridge-Mono Option ProtectionInput-Sensitivity Option Condition Power indicator is off TroubleshootingSpecifications Bridge-Mono 105 145 KHz 20 Hz 50 Hz DualKHz 50 Hz KHz 20 Hz Dual 120Service Warranty Worldwide Except USA & Canada Items Excluded from this CROWN- WarrantySeries Power Amplifiers Nature of Problem Crown Factory Service InformationThis page Intentionally Left Blank Series Power Amplifiers

D-45, D-75A specifications

Crown Audio has earned its reputation as a leader in professional audio solutions, with a commitment to delivering high-quality amplifier technology that meets the demands of audio professionals across various applications. Two notable models in their lineup are the Crown D-75A and D-45, both of which embody unique features that are tailored for versatility and superior performance.

The Crown D-75A is a high-performance power amplifier designed for applications where exceptional sound quality is essential. With an output power of 75 watts per channel into 8 ohms, this amplifier is capable of driving a wide range of loudspeakers, making it an excellent choice for installations in commercial venues or high-end residential systems. One of its standout features is the ability to operate in both stereo and bridged mono modes, allowing for flexible configuration options. The D-75A also incorporates Crown’s patented Class I technology, which enables it to maintain high efficiency while minimizing distortion and heat generation.

On the other hand, the Crown D-45 offers a slightly lower output power, rated at 45 watts per channel into 8 ohms. Despite its smaller size, the D-45 packs a punch with its robust performance and advanced technologies. This amplifier is well-suited for smaller venues or as a part of an audio system where space is a concern. Just like the D-75A, the D-45 features the ability to run in stereo or bridged mono modes, providing users with flexibility in setup.

Both amplifiers incorporate user-friendly front-panel controls, including level adjustments and power indicators, allowing for easy operation and monitoring. Furthermore, they are engineered with short-circuit and thermal overload protection, ensuring longevity and reliability in demanding environments.

In terms of connectivity, the D-75A and D-45 come equipped with professional-grade XLR and RCA input options, facilitating seamless integration into various audio systems. Their durable construction is designed to withstand the rigors of professional use, while also being aesthetically pleasing for any installation.

In conclusion, the Crown Audio D-75A and D-45 amplify the brand’s commitment to quality and innovation, providing professionals with dependable solutions that do not compromise on sound fidelity. Whether for a small venue or a large installation, these amplifiers deliver the performance and features audio engineers seek, making them an excellent choice in the competitive world of sound reinforcement.
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