General Specifications - Crown D-75 Instruction Manual

SE TION 2.
SPE IFI ATIONS/PERFORMAN E
2.1 General Specifications
Hum and Noise:
+ 10°, - 15° 20Hz - 20KHz at 1 watt hase Response:
(XLR balanced) 20,000 ohms +30% Input Impedance:
(XLR unbalanced) 10,000 ohms +30%
(phone jack unbalanced) 25,000 ohms ±30%
Overall rotection:
(shorted input) +10 millivolts. DC Output Offset:
Instantaneous, with minimum bass thumps and no program delay.
Turn On:
Circuit:
ower Supply:
ower Requirements:
15 watts while at idle, 120 watts at the full rated output.
ower Consumption:
Heat Sinking:
Chassis:
Controls:
2-1
Aluminum-chassis construction for maximum heat conduction and minimum
weight.
From 20 Hz - 20KHz the hum and noise level is below 175 microvoltsand 106dB be ­
low the rated output.
AC line fused. The controlled slewing rate of the voltage amplifiers protects the
overall amplifier against RF burnout, input overload protection is furnished by an
internal resistance at the amplifier ' s inputs.
A specially designed low profile transformer, two regulated supplies for complete
isolation and stability plus computer grade filter capacitors serve to power the D-75.
AC voltages of 100, 120,200,220, and 240 volts + 10% at a line-frequency between 50
and 400Hz may be used.
A total of 42 transistors, 18 signal diodes, 2 zener diodes, 4 rectifiers and 3 linear 1C
(dual op-amp) are utilized in a wideband multiple feedback loop design.
The entire amplifier is used as a heat sink. Front-panel extrusion acts as a heat sink
along with the chassis covers.
Two input-level controls and a power switch on the front panel. A mono-stereo
switch, located next to the input jacks, on the rear panel.
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D-75
Amplifier Output rotection: Total protection against shorted, mismatched or open outputs. Volt-ampere
limiting circuitry acts instantaneously with no annoying thumps or cutouts.