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RECORDING & BROADCAST
T
he D-45 and D-75A are long-term standards. They are perfect for moderate power applications
such as recording or broadcast studio near-field monitoring, video suite audio monitoring, a
recording/broadcast headphone amp or a small paging system. Convection cooled, the highly reli-
able D Series is protected against shorted, open, mismatched or low-impedance loads.
SPECIFICATIONS
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.
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 ultra-
sonic/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.
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 Configura-
tions Available: 100, 120, 220 and 240VAC
(±10%), 50 to 400 Hz for international units
(depending on the transformer configuration).
North American 120VAC, 60 Hz units are not
convertible and can only be used at the speci-
fied 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
indicator for each channel flashes synchro-
nously 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
(6.35-mm) phone connector for each chan-
nel.
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.
Channel 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
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 finish 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 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.
Regulatory Certifications
Other Applications
8/06 136711-1C