Crown Audio D-75A, D-45 operation manual Wire Your System Dual Mode, Bridge-Mono Mode

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D Series Power Amplifiers

2Setup

2.6Wire Your System

2.6.1 Dual Mode

Typical input and output wiring is shown in Figure 2.6.

INPUTS: Connect input wiring for each channel.

OUTPUTS: Maintain proper polarity (+/-) on output connec- tors.

Connect Channel 1 positive (+) speaker load to Channel 1 positive terminal of amp; repeat for negative (-). Repeat each channel wiring as for Channel 1. Refer to Section 2.5 for out- put connector pin assignments.

2.6.2 Bridge-Mono Mode

Your amplifier is factory-configured for dual (stereo) opera- tion. As an option, the unit can be configured for higher power, single-channel, bridge-mono mode by an authorized Crown Service Center. To prevent damage to the amplifier, do not operate the unit in bridge-mono mode without the Service Center modification.

Typical input and output wiring is shown in Figure 2.7.

INPUTS: Connect input wiring only to CH 1.

OUTPUTS: Connect the speaker across the positive output terminals. Do not use the negative terminals when the ampli- fier is being operated in Bridge-Mono mode.

NOTE: Crown provides a reference of wiring pin assign- ments for commonly used connector types in the Crown Amplifier Application Guide available at www.crownau- dio.com.

NOTE: When operating in Bridge-Mono mode, turn down (full CCW) the CH 2 level control. The CH 1 level control works both channels.

If your loudspeakers don’t need the additional volt- age, and you only have one input signal to drive mul- tiple loudspeakers, you can use bridge-mono mode without actually bridging the outputs. Bridge-mono mode is like dual mode except the channel 1 input feeds both outputs, and the channel 2 output is inverted. To use bridge-mono mode without bridging the outputs, wire your loudspeakers as you would for dual mode, but invert the polarity of the channel 2 output wiring (positive goes to negative, and negative goes to positive).

Figure 2.6

System Wiring

for Dual Mode

Figure 2.7

System Wiring

for Bridge-Mono

Mode

Do not wire the amplifier in bridge-mono mode without having it modified by an authorized Crown Service Center.

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Operation Manual

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Contents 75A Some models may be exported under the name AmcronImportant Safety Instructions Series amplifiers require Class 2 output wiringWatch for These Symbols Use only with a cart, stand, bracket, or tableSafety Standard Declaration of ConformityCrown International, Inc European Representative’s Name and AddressTable of Contents Features How to Use This ManualWelcome Detented level controls for precise repeat- abilityManual SetupUnpack Your Amplifier Install Your Amplifier Crown recommends using professionally con- structed, high Choose Input Wire ConnectorsChoose Output Wire and Connectors Inputs Connect input wiring only to CH Wire Your System Dual ModeBridge-Mono Mode AC Mains Voltage Configura Tion Startup ProcedureConnect to AC Mains Turn up the level of your audio source to an optimum levelPrecautions OperationControls, Indicators and Con- nectors Front and Back ViewsControls IndicatorsFuse Replacement Input-Sensitivity Option ProtectionOptions Bridge-Mono Option Troubleshooting Condition Power indicator is offSpecifications KHz 20 Hz 50 Hz Dual Bridge-Mono 105 145KHz 50 Hz KHz 20 Hz Dual 120Service Warranty Items Excluded from this CROWN- Warranty Worldwide Except USA & CanadaSeries Power Amplifiers Crown Factory Service Information Nature of ProblemThis 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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