Crown D-45 User manual

D-45 D SERIES
T
The Crown®D Series delivers dependable
operation with a wide variety of loads.
Because of their exceptional reliability,
D-Series amplifiers have become the leading
choice of professionals for use in recording
studios, laboratories and public facilities. You
can even find them on the road. Their sonic
excellence also makes them a very good choice
for your personal listening pleasure.
D-Series amplifiers are compact and provide
ultra-low distortion for medium power appli-
cations. Crown’s advanced AB+B circuitry
ensures efficient operation and protects
against shorted, open, mismatched or low-
impedance loads that can affect any amplifi-
er’s performance. Crown further protects your
investment with the industry’s only Three-
Year, No-Fault, Fully Transferable Warranty.
After learning about your amplifier’s features,
facilities and capabilities, you’ll understand
why Crown power amplifiers have long been
recognized as the worldwide standard for
audio excellence.
For more details about the D-45 and D-75A,
contact the Crown Technical Support Group at
800-342-6939 or 574-294-8200. Also, visit the
Crown Audio website at www.crownaudio.com.
Specifications
The following apply to units in dual mode with both channels
driven into 8 ohm loads and an input sensitivity of 26 dB gain
unless otherwise specified.
Performance
Frequency Response: ±0.1 dB from 20 Hz to
20 kHz at 1watt.
Phase Response: +10 to –15 degrees from 20
Hz to 20 kHz at 1 watt.
Signal-to-Noise: 106 dB from 20 Hz to 20 kHz
at full bandwidth FTC power.
SIGNAL
IOC
CHANNEL 1 CHANNEL 2
HEADPHONES POWER
OFF ON
LEVEL
30
50
40
0
10
20
LEVEL
30
50
40
0
10
20
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 provide proof
of distortion-free performance
• Signal presence indicators verify the presence
of amplifier output
• Detented level controls for precise repeatabil-
ity
• 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 audio specifications for digital compact
discs (CDs)
• High damping factor provides exceptional loud-
speaker motion control
• Convection cooling system dissipates heat
through the heat sinks and chassis for optimal
cooling and maintenance-free operation
• Mounts in a standard 19-inch (48.3-cm) rack
• Three-Year, No-Fault, Fully Transferable War-
ranty protects your investment and guarantees
its specifications
Total Harmonic Distortion (THD): Less than
0.001% at full bandwidth FTC power from 20
Hz to 400 Hz increasing linearly to 0.05% at
20 kHz.
Intermodulation Distortion (IMD): (60 Hz and
7 kHz 4:1) Less than 0.01% from 0.25 watts
to full bandwidth FTC power, and less than
0.05% from 0.01 to 0.25 watts.
Crosstalk: Greater than 100 dB below full
bandwidth FTC power from 100 Hz to 1 kHz
decreasing linearly to 80 dB at 20 kHz.
Damping Factor: Greater than 400 from DC to
400 Hz.
Controlled Slew Rate: 6 volts per ms.
(Slew rates are limited to useful levels for
ultrasonic/RF protection.)
Voltage Gain:
At the maximum level setting, 8-ohm load,
0.775V input sensititivity.
D-45: 18.3:1 ±3% or 25.2 dB ±0.3 dB.
D-75A: 23:1 ±3% or 27.3 dB ±0.3 dB.
Power
Output Power: See power charts below.
Load Impedance: Safe with all types of loads.
Rated for 4 to 16 ohms in dual mode, and 8 to
16 ohms in bridge-mono mode.
AC Line Voltage and Frequency Configurations
Available: 100, 120, 220 and 240VAC (±10%),
50 to 400 Hz for international units (depending
on the transformer configuration). North Ameri-
can 120VAC, 60 Hz units are not convertible
and can only be used at the specified voltage
and frequency. All units draw 15 watts or less
when idle. Maximum AC power consumption is
150 watts.
Controls
Power: A two-position front panel rotary
on/off switch.
Level: An independent 31-position detented
front panel level control for each channel.
Dual/Mono: The dual/mono jumper is located
inside the amplifier.
Ground Lift: To prevent ground loops, the
chassis and signal grounds are separated (or
“lifted”) by a permanent impedance installed
between them. There is no control for this
feature.
Indicators
Signal Presence: The green front panel indi-
cator for each channel flashes synchronously
with the channel’s output signal to indicate its
presence.
Input/Output Comparator: The red Input/Output
Comparator (IOC) indicator for each channel
flashes if any type of distortion reaches 0.05%.
D-75A
1 kHz
Power
35W
25W
20W
70W
50W
D-45
*1 kHz Power: refers to maximum average power in watts
at 1 kHz with 0.1% THD.
*
4 ohm Dual (per channel)
8 ohm Dual (per channel)
16 ohm Dual (per channel)
8 ohm Bridge-Mono
16 ohm Bridge-Mono
1 kHz
Power
55W
40W
25W
80W
D-75A
*1 kHz Power: refers to maximum average power in watts
at 1 kHz with 0.1% THD.
*
4 ohm Dual (per channel)
8 ohm Dual (per channel)
16 ohm Dual (per channel)
8 ohm Bridge-Mono
16 ohm Bridge-Mono
110W
136711-1C_8-06_D45-D75A_datasheeSec11 Sec11 8/22/2006 11:14:14 AM

Crown International
1718 W. Mishawaka Rd.
Elkhart, IN 46517-9439
TEL: [phone]
FAX: [phone]FAX
8/06 136711-1C
Crown’s Three-Year, No-Fault, Fully Transferable Warranty
Crown offers a Three-Year, No-Fault, Fully Transferable Warranty for every new Crown ampli-
fier—an unsurpassed industry standard. With this unprecedented No-Fault protection, your new
Crown amplifier is warranted to meet or exceed original specifications for the first three years of
ownership. During this time, if your amplifier fails, or does not perform to original specifications,
it will be repaired or replaced at our expense. About the only things not covered by this warranty
are those losses normally covered by insurance and those caused by intentional abuse. And the
coverage is transferable, should you sell your amplifier.
See your authorized Crown dealer for full warranty disclosure and details. For customers outside
of the USA, please contact your authorized Crown distributor for warranty information or call
574-294-8200.
Specifications subject to change without prior notice. Latest
information available at www.crownaudio.com.
Crown, Crown Audio and IOC are registered trademarks of
Crown International. Other trademarks are the property of
their respective owners. Printed in U.S.A.
© 2006 Crown Audio®, Inc.
IMPORTANT:
IN MONO MODE USE
THE CH-1 INPUT ONLY.
3
12
GND
+TIP
RING
SLEEVE
GND
XLR WIRING
PHONE WIRING
REMPLACER
SEULMENT
REPLACE ONLY WITH
3AG 2A 125/250V
PUSHPUSH
+
CH-2 CH-1INPUTS
OUTPUTS
CH-2 CH-1
+
fiINTERNATIONAL, INC.
ELECTRONIC EQUIPMENT
ELKHART, IN 46517
MADE IN U.S.A.
SERIAL NUMBER
0000
000000
MODEL
AC VOLTS
MAX POWER IN
U.S. PATENT NO. 3,493,879
AMPS.
50-400 Hz
WATTS
Input/Output
Input Connector: A balanced 3-pin female
Neutrik®combination XLR and ¼-inch
(6.35-mm) phone connector for each channel.
Input Impedance: Nominally 20 k ohms, bal-
anced. Nominally 10 k ohms, unbalanced.
Input Sensitivity: Configurable for 26 dB gain
or 0.775 volt sensitivity.
Output Connector: Barrier block terminals and
stereo headphone jack. The headphone output
is unpadded, and in parallel with the main
amplifier outputs.
Output Impedance: Less than 15 milliohms in
series with less than 3 microhenries.
DC Output Offset: 10 millivolts or less.
Output Signal
Dual: Unbalanced, two channel.
Bridge-Mono: Balanced, single channel. Chan-
nel 1 controls are active; channel 2 controls
should be turned down.
Protection
Input: The inputs have series resistance that
provides input overload protection. Controlled
slew rate voltage amplifiers protect against
radio frequencies. The AC line is fused to pro-
tect against excessive current draw.
Output: Instantaneous limiting protection for
short circuits, open circuits and mismatched
loads.
Turn-On: Minimum thumps. Power-up is
instantaneous with no program delay.
Construction
Durable black finish on aluminum front panel
with gray suede Lexan insert. Aluminum chas-
sis provides maximum heat conduction and
minimum weight.
Dimensions: 19-inch (48.3 cm) rack mount
width, 1.75 inches (4.5 cm) high, 8.5 inches
(21.6 cm) deep behind the mounting surface,
and a 0.625-inch (1.6-cm) protrusion in front of
the mounting surface.
Net Weight:
D-45: 8 lb, 11 oz (3.9 kg)
D-75A: 9 lb, 7 oz (4.3 kg).
Shipping Weight:
D-45: 10 lb, 9 oz (4.8 kg)
D-75A: 11 lb, 4 oz (5.1 kg).
Cooling: The amplifier is totally convection
cooled. The entire aluminum chassis acts as
a conductor to dissipate heat. The covers and
front panel extrusion also act as heat sinks.
Much of the unit’s heat is conducted through
the extruded front panel. This design is used so
that front panel contact with the equipment rack
will also dissipate heat.
D-45
D-75A
136711-1C_8-06_D45-D75A_datasheeSec12 Sec12 8/22/2006 11:14:28 AM