Crown Audio D-75A, D-45 operation manual Indicators, Controls, Fuse Replacement

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3 Operation

3.3 Indicators

Your amplifier has five front panel indicators. First, a power indicator behind the front panel becomes visible when the unit is turned on and has power. A signal indicator for each channel (Figure 3.2 ) flashes when there is output from the amplifier. The IOC (Input/Output Compara- tor) indicators work like sensitive distortion meters and flash when the amplifier causes any distortion of 0.05% or more. The IOC indica- tors typically glow for about one minute after the AC power is turned off.

3.4 Controls

A power switch and detented level controls are located on the front panel. When you power up the amplifier, remember that the unit does not have a turn-on delay. Each channel has its own level control which is used to adjust the desired output level. Both level controls (Figure 3.2) are used in dual mode, but only the channel 1 control should be used in bridge-mono mode. Channel 2 control should be fully counter- clockwise in bridge-mono mode.

3.5 Fuse Replacement

The AC mains fuse is located on the back panel beside the power cord. This fuse will not blow unless something is wrong. Before replacing

the unit’s fuse, you should be sure to fix the source of the problem. If the problem is not immediately apparent, the unit probably needs to be serviced by a qualified technician.

WARNING: Always unplug the amplifier from the AC mains before removing the fuse.

To replace the fuse, turn off the power switch and disconnect the power plug from the AC mains. Unscrew the fuse holder cap (shown in Figure 3.1, back view) and remove the fuse.

Install appropriate fuse:

100 or 120 volt mains: 2 Amp type 3AG.

North American 200, 220 and 240 volt mains: 1 Amp type 3AG.

European 220 or 240 volt mains: 1 Amp IEC type T, time lag, low breaking capacity.

Then, simply resecure the fuse holder cap and reconnect the AC mains.

IMPORTANT: Never install a fuse that has a higher current rating than the rec- ommended value.

IMPORTANT: The 3AG and IEC fuses are different physical sizes and require dif- ferent holder caps. The 3AG and IEC fuses should not be exchanged even though they are the same value.

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D Series Power Amplifiers

Figure 3.2

Indicators and Level

Controls

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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- abilitySetup Unpack Your Amplifier Install Your AmplifierManual Choose Input Wire Connectors Choose Output Wire and ConnectorsCrown recommends using professionally con- structed, high Wire Your System Dual Mode Bridge-Mono ModeInputs Connect input wiring only to CH 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 ViewsIndicators Fuse ReplacementControls Protection Options Bridge-Mono OptionInput-Sensitivity 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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