Specifications
RECORDING & BROADCAST
• 45
T
he D-45 and D-75A are long-term standards. They are perfect for mod-
erate 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
reliable D Series is protected against shorted, open, mismatched or low-
impedance loads.
`SPECIFICATIONS
Performance
Frequency Response (at 1 watt) 20 Hz to 20 kHz:
±0.1 dB.
Phase Response (from 20 Hz to 20 kHz at 1 watt):
+10 to –15 degrees.
Signal-to-Noise Ratio below rated power (20 Hz -
20 kHz): 106 dB.
Total Harmonic Distortion (THD) at full bandwidth
power: 0.05% from 20 Hz to 20 kHz.
Intermodulation Disto rtion (IMD) (60 Hz and
7 kHz at 4:1)
from 0.25 watts to full bandwidth power: < 0.01%.
from 0.01 to 0.25 watts: < 0.05%.
Damping Factor, from DC to 400 Hz: > 400.
Crosstalk (below rated power): 100 Hz to 1 kHz,
>100 dB.
Input Impedance (nominally balanced, nominally
unbalanced): 20 k ohms, 10 k ohms.
Input Sensitivity: Configurable for 26 dB gain or
0.775-volt sensitivity.
Load Impedance: Safe with all types of loads.
Rated for 4 to 16 ohms in Dual mode, 8 to 16
ohms in Bridge-Mono mode.
AC Line Voltages Available (±10%): 100, 120,
200, 220 and 240 VAC, 50 to 400 Hz for interna-
tional units (depending on the transformer con-
figuration). 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.
Front Panel Controls
Power: A two-position rotary on/off switch.
Level: An independent detented front-panel level
control for each channel.
Dual/Mono: A jumper located inside the amplifier
selects between dual and mono operation.
Front Panel 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 flash-
es if any type of distortion reaches 0.05%.
Input Connectors
A balanced 3-pin female Neutrik combination XLR
and 1/4-inch phone connector for each channel.
Output Connectors
Barrier block terminals and stereo headphone jack.
The headphone output is unpadded, and in parallel
with the main amplifier outputs.
Protection
Input: The inputs have series resistance that pro-
vides input overload protection. Controlled slew
rate voltage amplifiers protect against radio fre-
quencies. 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 instanta-
neous with no program delay.
Construction
Durable black finish on aluminum front panel
with gray suede Lexan insert. Aluminum chassis
provides maximum heat conduction and mini-
mum weight.
Cooling
The amplifier is totally convection cooled. The
entire aluminum chassis acts as a conductor to
dissipate heat. The covers and front-panel extru-
sion also act as heat sinks. Much of the unit’s heat
is conducted through the extruded front panel. This
design is used so the front panel contact with the
equipment rack will also dissipate heat.
Dimensions
EIA Standard 19-inch (48.3-cm) rack mount width
(EIA RS-310-B), 1.75-inch (4.5-cm) height and 8.5-
inch (21.6-cm) depth behind the mounting surface,
and a 0.624-inch (1.6-cm) protrusion in front of the
mounting surface.
Weight
Net Weight,
D-45: 8 lbs. 11 oz. (3.9 kg);
D-75A: 9 lbs. 7 oz. (4.3 kg).
Shipping Weight,
D-45: 10 lbs. 9 oz.(4.8 kg);
D-75A: 11 lbs. 4 oz. (5.1 kg).
Regulatory Certifications
Other Applications
All measurements apply to units in Dual mode with
both channels driven into 8-ohm loads and an input
sensitivity of 26 dB gain unless otherwise specified.