Crown D-45, D-75-A Brochure
D-45
T
D-75A
D SERIES
30
CHANNEL 1 CHANNEL 2
20
40
50
10
IOC
0
HEADPHONES POWER
LEVEL
SIGNAL
30
20
40
50
10
0
LEVEL
OFF ON
he Crown® D Series delivers dependable
operation with a wide variety of loads.
T
Because of their exceptional reliability,
D-Series amplifi ers have become the leading
choice of professionals for use in recording
studios, laboratories and public facilities. You
can even fi nd them on the road. Their sonic
excellence also makes them a very good choice
for your personal listening pleasure.
D-Series amplifi ers are compact and provide
ultra-low distortion for medium power applications. Crown’s advanced AB+B circuitry
ensures effi cient operation and protects
against shorted, open, mismatched or lowimpedance loads that can affect any amplifi er’s performance. Crown further protects your
investment with the industry’s only ThreeYear, No-Fault, Fully Transferable Warranty.
After learning about your amplifi er’s features,
facilities and capabilities, you’ll understand
why Crown power amplifi ers 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.
Specifi cations
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 specifi ed.
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.
*
D-45
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: refers to maximum average power in watts
at 1 kHz with 0.1% THD.
1 kHz
Power
35W
25W
20W
70W
50W
Features
• Powerful AB+B class circuitry yields maximum 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 amplifi er output
• Detented level controls for precise repeatability
• Ultra-low harmonic and intermodulation
distortion result in the best dynamic transfer
function in the industry
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.
*
D-75A
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: refers to maximum average power in watts
at 1 kHz with 0.1% THD.
1 kHz
Power
55W
40W
25W
110W
80W
• Very low noise and wide dynamic range exceed
the audio 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 maintenance-free operation
• Mounts in a standard 19-inch (48.3-cm) rack
• Three-Year, No-Fault, Fully Transferable Warranty protects your investment and guarantees
its specifi cations
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 Confi gurations
Available: 100, 120, 220 and 240VAC (±10%),
50 to 400 Hz for international units (depending
on the transformer confi guration). North American 120VAC, 60 Hz units are not convertible
and can only be used at the specifi ed 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 amplifi er.
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 fl ashes synchronously
with the channel’s output signal to indicate its
presence.
Input/Output Comparator: The red Input/Output
Comparator (IOC) indicator for each channel
fl ashes if any type of distortion reaches 0.05%.
ELKHART, IN 46517
MADE IN U.S.A.
SERIAL NUMBER
MODEL
AC VOLTS
MAX POWER IN
fi
INTERNATIONAL, INC.
ELECTRONIC EQUIPMENT
000000
U.S. PATENT NO. 3,493,879
AMPS.
50-400 Hz
WATTS
D-45
REMPLACER
0000
SEULMENT
REPLACE ONLY WITH
3AG2A 125/250V
+
CH-2 CH-1
OUTPUTS
+
CH-2 CH-1INPUTS
IMPORTANT:
IN MONO MODE USE
PUSHPUSH
THE CH-1 INPUT ONLY.
XLR WIRING
PHONE WIRING
3
GND
12
+
TIP
RING
SLEEVE
GND
D-75A
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: Confi gurable 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
amplifi er 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 amplifi ers protect against
radio frequencies. The AC line is fused to protect 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 fi nish on aluminum front panel
with gray suede Lexan insert. Aluminum chassis 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 amplifi er 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.
Crown’s Three-Year, No-Fault, Fully Transferable Warranty
Crown offers a Three-Year, No-Fault, Fully Transferable Warranty for every new Crown amplifi er—an unsurpassed industry standard. With this unprecedented No-Fault protection, your new
Crown amplifi er is warranted to meet or exceed original specifi cations for the fi rst three years of
ownership. During this time, if your amplifi er fails, or does not perform to original specifi cations,
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 amplifi er.
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.
Crown International
1718 W. Mishawaka Rd.
Elkhart, IN 46517-9439
TEL: 574-294-8200
FAX: 574-294-8FAX
Specifi cations 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.
8/06 136711-1C
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