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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 (depend-
ing 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
Comparator (
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.
