Crown D-45 Reference Manual page 5

D-45 / D-75A Power Amplifiers
This standard stereo
phone jack is used to
connect headphones
This knob controls
the Channel 1 and
left headphone
output levels
30
40
50
0
HEADPHONES LEVEL
INTERNATIONAL, INC.
®
ELECTRONIC EQUIPMENT
ELKHART, IN 46517
0000
MADE IN U.S.A.
000000
SERIAL NUMBER
MODEL AMPS.
AC VOLTS 50-400 Hz
MAX POWER IN WATTS
U.S. PATENT NO. 3,493,879
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 profes-
sionals for use in studios, laboratories and public facili-
ties. You can even find them on the road. And their
sonic excellence makes them a very good choice for
your personal listening pleasure.
The D-45 and D-75A amplifiers are compact and pro-
vide ultra-low distortion for medium power applications.
Crown's advanced AB+B circuitry ensures efficient
operation and protects against shorted, open, mis-
matched or low-impedance loads that can affect any
amplifier's performance. Crown further protects your
investment with the industry's only three year "No-Fault"
full warranty. After learning about your amplifier's fea-
tures, facilities and capabilities, you'll understand why
Crown power amplifiers have long been recognized as
the worldwide standard for audio excellence.
For your protection, please send in your warranty reg-
istration card today and save your bill of sale as it is
your official proof of purchase.
1.1 Unpacking
Please unpack and inspect your new amplifier for any
damage that may have occurred during transit. If dam-
age is found, notify the transportation company imme-
diately. Only you, the consignee, may initiate a claim
This indicator flashes synch-
ronously with the Channel 1
output to show signal presence
This IOC indicator for Channel 1
flashes if any kind of amplifier
distortion exceeds 0.05%
30
CHANNEL 1 CHANNEL 2
20 40 20
10 50 10
IOC
0
SIGNAL
LEVEL
Power cord Barrier block output
connectors
REMPLACER
SEULMENT
+
CH-2
OUTPUTS
REPLACE ONLY WITH
3AG–2A 125/250V
Fuse holder
Fig. 1.1 Front and Back Views
This indicator becomes
visible when the unit is
on and has power
CH-2
+
CH-1
PUSH
for shipping damage. Even if the unit arrived in perfect
condition, as most do, save all packing materials so
you will have them if you ever need to transport the
unit. NEVER SHIP THE UNIT WITHOUT THE FAC-
TORY PACK.
1.2 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 maximum effi-
ciency with minimum crossover "notch" distortion.
IOC ® (Input/Output Comparator) alerts of any distortion
that exceeds 0.05% to provide proof of distortion-free
performance .
Signal presence indicators verify the presence of ampli-
fier output.
Detented level controls for precise repeatability.
Ultra-low harmonic and intermodulation distortion result
in the best dynamic transfer function in the industry.
Very low noise and wide dynamic range exceed the au-
dio specifications for digital compact discs (CDs).
High damping factor provides exceptional loudspeaker
motion control.
Convection cooling system dissipates heat through the
heat sinks and chassis for optimal cooling and mainte-
nance-free operation.
Mounts in a standard 19 inch (48.3 cm) rack.
Three year "No-Fault" full warranty protects your invest-
ment and guarantees the specifications of units in North
America and other select countries.
This knob is used to
turn the amplifier
on and off
OFF ON
POWER
Channel 1 combination
XLR/phone input connector
INPUTS CH-1
XLR WIRING
3
GND
1 2
PHONE WIRING
IMPORTANT: +
TIP
IN MONO MODE USE –
RING
PUSH
THE CH-1 INPUT ONLY.
GND SLEEVE
Page 5