Specifications
RECORDING / BROADCAST
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The 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 reliable D Series is protected
against shorted, open, mismatched or low-impedance loads.
Specifications
The following applies to units in Dual mode with both channels driven into 8-ohm loads and
an input sensitivity of 26 dB gain unless otherwise specified.
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 Distortion (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.
Power
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 international units (depending on the transformer config-
uration). 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.
Controls
Power: A two-position front panel 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.
Indicators
Signal Presence: The green front-panel indicator for each channel flashes
synchronously with the channel’s output signal to indicate its pres-
ence.
Input/Output Comparator: The red Input/Output Comparator (IOC) indica-
tor for each channel flashes if any type of distortion reaches 0.05%.
Input/Output
Input Connectors: A balanced 3-pin female Neutrik combination XLR and
1/4-inch phone connector for each channel.
Input Impedance: (nominally balanced, nominally unbalanced):
20 k ohms, 10 k ohms.
Input Sensitivity: Configurable for 26 dB gain or 0.775-volt sensitivity.
Output Connectors: Barrier block terminals and stereo headphone jack.
The headphone output is unpadded, and in parallel with the main
amplifier outputs.
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 pro-
tection. 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.
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 con-
ducted 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).
Other Applications:
Regulatory Certifications:
®