Crown Audio D-45 Welcome, page, Features, How to Use This Manual, D Series Power Amplifiers

D Series Power Amplifiers

	30		30	OFF	ON
	CHANNEL 1	CHANNEL 2
40	20	40		20
50	10	50		10

0

HEADPHONESLEVEL

IOC

SIGNAL

LEVEL	0
	POWER

1 Welcome

Reliability is the first thing you get with your purchase of a Crown power amplifier. The D-45 and D-75A both deliver dependable operation with a wide variety of loads. Because of their exceptional reliability, these amplifiers have become the leading choice of professionals for use in recording studios, laboratories and pub- lic facilities. You can even find them on the road. Their sonic excellence also makes them a very good choice for your personal listening pleasure.

The D-45 and D-75A amplifiers are compact and provide ultra-low distortion for medium power applications. Crown’s advanced AB+B circuitry ensures efficient operation and pro- tects against shorted, open, mismatched or low-impedance loads that can affect any ampli- fier’s performance.

Modern power amplifiers are sophisticated pieces of engineering capable of producing extremely high power levels. They must be treated with respect and correctly installed if they are to provide the many years of reliable service for which they were designed.

In addition, D Series amplifiers include a num- ber of features which require some explanation before they can be used to their maximum advantage.

Please take the time to study this manual so that you can obtain the best possible service from your amplifier.

1.1 Features

Your dual-channel (stereo) amplifier can optionally be configured to deliver double the power from a single (mono) channel. It also provides the following features:

•Powerful AB+B class circuitry yields maxi- mum efficiency with minimum crossover “notch” distortion.

•IOC® (Input/Output Comparator) alerts of any distortion that exceeds 0.05% to pro- vide proof of distortion-free performance.

•Signal presence indicators verify the pres- ence of amplifier output.

•Detented level controls for precise repeat- ability.

•Ultra-low harmonic and intermodulation distortion result in the best dynamic trans- fer function in the industry.

•Very low noise and wide dynamic range.

•High damping factor provides exceptional loudspeaker motion control.

•Convection cooling system eliminates fan noise and maintenance.

•Mounts in a standard 19-inch (48.3-cm) rack.

•Front-panel headphone jack.

•Three Year, No-Fault, Fully-Transferable Warranty completely protects your invest- ment and guarantees its specifications.

1.2 How to Use This Manual

This manual provides you with the necessary information to safely and correctly setup and operate your amplifier. It does not cover every aspect of installation, setup or operation that might occur under every condition. For addi- tional information, please consult Crown’s Amplifier Application Guide (available online at www.crownaudio.com), Crown Technical Sup- port, your system installer or retailer.

We strongly recommend you read all instruc- tions, warnings and cautions contained in this manual. Also, for your protection, please send in your warranty registration card today. And save your bill of sale — it’s your official proof of purchase.

Operation Manual page 5