Crown d-45 補足マニュアル

D-45

D S E R I E S

he Crown

D Series delivers dependable

operation with a wide variety of loads.
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 appli-
cations. Crown’s advanced AB+B circuitry
ensures effi cient 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 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.

SIGNAL

IOC

CHANNEL 1

CHANNEL 2

HEADPHONES

POWER

OFF ON

LEVEL

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 amplifi er 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 specifi cations

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 Confi gurations
Available: 100, 120, 220 and 240VAC (±10%),
50 to 400 Hz for international units (depending
on the transformer confi guration). North Ameri-
can 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%.

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