Crown D Series Specifications download pdf (Page 6)

Page 6

D-45 / D-75A Power Amplifiers

2 Installation

D-45

and

D-75A

amplifiers are designed for standard

19 inch (48.3 cm) rack mounting, or they can be

stacked without a cabinet. Before mounting your am-

plifier, determine whether you need to change the

amplifier’s internal settings for your application.

The amplifier’s internal settings make it possible for you

to operate the unit in bridge-mono mode and to change

the unit’s input sensitivity to 0.775 volts. If you need

maximum power from a single channel, you will prob-

ably want to use the bridge-mono mode. In contrast,

few applications will require you to change the input

sensitivity. If you need to configure the amplifier for

bridge-mono mode, or if you want more specific infor-

mation on your amplifier’s input sensitivity, please refer

to Appendix A before proceeding.

2.1 Mounting

Your amplifier should be mounted in a standard 19 inch

(48.3 cm) equipment rack. It occupies only 1.75 inches

(4.45 cm) of vertical rack space. Mounting screws and

washers are provided with the amplifier. Although units

can be stacked, this practice is not recommended. In-

stead, mount multiple units in a rack leaving air space

between them. Also, before mounting the amplifier,

please read about the amplifier’s cooling requirements

in the section that follows.

tors are located on the back panel. If you are making

changes to a unit that is already installed, make sure

the power is disconnected and the level controls are

turned down. Following these precautions will reduce

the chance of loud blasts and loudspeaker damage.

Please use care when making connections, selecting

signal sources and controlling the output level. The load

you save may be your own! Crown is not liable for dam-

age to other system components due to careless am-

plifier use or overpowering.

CAUTION: Be careful using headphones. Too much

power can cause permanent hearing loss.

2.3.1 Mode of Operation

Your amplifier may be operated in either dual or bridge-

mono mode. Configuration of the dual/mono jumper is

described in Appendix A. Dual and bridge-mono

modes have important wiring differences, so be sure to

note the requirements for the mode you select.

D U A L

Dual mode installation is very intuitive. The channel 1

input feeds the channel 1 output, and the channel 2

input feeds the channel 2 output. Use two-conductor

cable to connect loudspeakers to the amplifier’s output

terminals. Be careful not to short the outputs together,

and observe correct loudspeaker polarity.

CAUTION: Do not tie the two outputs together. Never

tie an output to another amplifier’s output.

M O N O

Installation in bridge-mono mode is very different from

dual mode. First, only the channel 1 input should be

used. Do not use the channel 2 input. For best results,

disconnect all input sources to channel 2 and turn off

the channel 2 level control (fully counterclockwise).

Note:

The channel 2 input and level control are not de-

feated in bridge-mono mode. A signal feeding channel

2 will work against the signal feeding channel 1.

Connect loudspeaker cables to the positive (+) output

terminals as shown in Figure 2.2 in the bottom illustra-

tion. Do not use or short the negative (–) terminals. The

bridge-mono output is balanced, and should remain

isolated from the chassis and input signal grounds.

CAUTION: Only connect balanced loads to a bridge-

mono output. Output lines must be isolated from

ground or severe oscillations may occur.

If your loudspeakers don’t need the additional voltage,

and you only have one input signal to drive multiple

Fig. 2.1 Mounting Dimensions

2.2 Cooling

Your amplifier does not have a cooling fan. To prevent

overheating, sufficient ventilation is required. Equipment

racks or cabinets should have perforated top and bot-

tom panels. This is very important if more than one unit

will be mounted in a rack. We recommend allowing a

1.75 inch (4.45 cm) space above and below the unit if it

will be operated continuously at high output levels.

2.3 Wiring

Figure 2.2 shows two of the most common ways to in-

stall your amplifier in a sound system. Except for the

stereo headphone jack, all input and output connec-

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Crown D Series Specifications Page 6

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