| 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 ultrasonic/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.
Power
- 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 240VAC (±10%), 50 to 400 Hz for international units (depending on the ransformer configuration). North American 120VAC, 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.
- 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 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 (6.35-mm) phone connector for each channel.
- Input Impedance: Nominally 20 k ohms, balanced. 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.
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