Crown D Series Specifications download pdf (Page 11)

Page 11

D-45 / D-75A Power Amplifiers

4 Specifications

Note: The following specifications apply to all units in dual

mode with both channels driven into 8 ohm loads and an

input sensitivity of 26 dB gain unless otherwise specified.

Standard 1 kHz Power: This term refers to maximum aver-

age power in watts at 1 kHz with 0.1% THD.

Full Bandwidth FTC Power: This term refers to standard FTC

power in watts from 20 Hz to 20 kHz with 0.1% THD.

120 VAC, 60 Hz Units: These North American units have

dedicated transformers for 120 VAC, 60 Hz power mains.

International Units: These units have a convertible trans-

former for 100, 120, 200, 220 and 240 VAC, 50 to 400 Hz

power mains.

Performance

Frequency Response: ±0.1 dB from 20 Hz to 20 kHz

at 1 watt.

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.

Total Harmonic Distortion (THD): Less than 0.001%

at full bandwidth FTC power from 20 Hz to 400 Hz in-

creasing 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) 20.6:1

±3% or 26.3 dB ±0.3 dB. Refer to Appendix A for infor-

mation on the 0.775 volt sensitivity setting.

Power

Output Power:

Note: Maximum average power per channel at 1 kHz

with 0.1% or less THD.

D-45:

Dual mode (both channels driven):

35 watts into 4 ohms.

25 watts into 8 ohms.

20 watts into 16 ohms.

Bridge-Mono mode:

70 watts into 8 ohms.

50 watts into 16 ohms.

D-75A:

Dual mode (both channels driven):

55 watts into 4 ohms.

40 watts into 8 ohms.

25 watts into 16 ohms.

Bridge-Mono mode:

110 watts into 8 ohms.

80 watts into 16 ohms.

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.

Required AC Mains: 100, 120, 200, 220 and 240 VAC

(±10%), 50 to 400 Hz for international units (depending

on the transformer configuration). North American

120 VAC, 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 (refer to Appendix A).

Ground Lift: To prevent ground loops, the chassis and

signal grounds are separated (or “lifted”) by a perma-

nent impedance installed between them. There is no

control for this feature.

Indicators

Signal Presence: The green front panel indicator for

each channel flashes synchronously with the channel’s

output signal to indicate its presence.

Input/Output Comparator: The red Input/Output Com-

parator (

IOC

) indicator for each channel flashes if any

type of distortion reaches 0.05%.

Input/Output

Input Connector:

A balanced 3-pin female Neutrik

combination XLR and ¼-inch phone connector for each

channel.

Input Impedance: Nominally 20 K ohms, balanced.

Nominally 10 K ohms, unbalanced.

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Crown D Series Specifications Page 11

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