Crown D Series Specifications download pdf (Page 10)

Page 10

D-45 / D-75A Power Amplifiers

The amplifier is switched between dual and bridge-

mono operation with the dual/mono jumper located in-

side the amplifier (see Appendix A).

The unit’s input gain is 26 dB as determined by 1%

precision resistors in the feedback loop. This can be

changed to a sensitivity of 0.775 volts by following the

instructions provided in Appendix A.

3.4 Protection

Your amplifier is protected against all common hazards

that plague high-power amplifiers, including shorted,

open or mismatched loads; overloaded power sup-

plies, 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 maximum safe value for the output

transistors. With a loudspeaker, you can tell the ampli-

fier has activated load protection because it causes

audible distortion. The noise might be compared to

crossover notch distortion or a snapping sound, de-

pending on the load characteristics. Loudspeaker sys-

tems 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 further 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.

3.5 Fuse Replacement

The AC mains fuse is located on the back panel beside

the power cord. This fuse will not blow unless some-

thing 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 dis-

connect the power plug from the AC mains. Unscrew

the fuse holder cap 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 recon-

nect the AC mains.

IMPORTANT: Never install a fuse that has a higher

current rating than the recommended value.

IMPORTANT: The 3AG and IEC fuses are different

physical sizes and require different holder caps.

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Crown D Series Specifications Page 10

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