Specifications - Crown DC-300A II Reference Manual

6 Specifications

Note: The following specifications apply to units configured for
120 VAC, 60 Hz operation in Dual mode with 8 ohm loads and an
input sensitivity of 26 dB gain unless otherwise specified.
Performance
Frequency Response: ±0.1 dB from DC to 20 kHz at
1 watt (see Figure 6.9).
Phase Response: +0/–15 degrees from DC to 20 kHz
at 1 watt (see Figure 6.5).
Signal-to-Noise Ratio: (20 Hz to 20 kHz) At least
110 dB below rated maximum average power (see Fig-
ure 6.8).
Harmonic Distortion (THD): Less than 0.001% from
20 to 400 Hz and increasing linearly to 0.05% at 20 kHz
at rated maximum average power.
Intermodulation Distortion (IMD): (SMPTE-IM 60 Hz
and 7 kHz) Less than 0.05% from 0.01 to 0.25 watts,
and less than 0.01% from 0.25 to rated maximum aver-
age power.
Damping Factor: Greater than 750 from DC to 400 Hz
(see Figure 6.4).
Crosstalk: See Figure 6.6.
Slew Rate: Greater than 8 volts per microsecond.
Voltage Gain: (At maximum output) 20.6:1 ±2% or
26.3 dB ±0.2 dB. (Refer to Section 7 for information on
the 0.775 volt sensitivity setting.)
Power
Also see the power matrix. Note: Maximum average
power per channel at 1 kHz with 0.1% or less THD.
Dual mode (both channels driven):
305 watts into 4 ohms.
175 watts into 8 ohms.
100 watts into 16 ohms.
Bridge-Mono mode:
610 watts into 8 ohms.
355 watts into 16 ohms.
Load Impedance: Rated for 16, 8 and 4 ohm use. Safe
with all types of loads.
Power Supply: 1 kilowatt transformer with computer-
grade filter capacitors storing over 48 joules of energy.
Power Efficiency: See Figure 6.7.
Power Requirements: Requires 50 to 400 Hz AC with
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selectable transformer taps for 100, 120, 200, 220 and
240 VAC (±10%) operation. Draws 40 watts or less at
idle and 500 watts at rated power.
Controls
Independent level controls and power switch are lo-
cated on the front panel. Non-interacting DC balance
controls are mounted on main PC board under elec-
tronics cover. A Dual-Mono switch is located below the
input jacks on the back panel.
Indicators
Power: This yellow indicator remains lit while the am-
plifier is turned on.
IOC: These red indicators are normally off. They flash
in the unlikely event of the output waveform differing
from the input by 0.05% or more. They act as sensitive
distortion indicators providing proof of performance .
Input/Output
Input Impedance: Nominally 25 K ohm.
Input Sensitivity: 1.75 volts ±2% for 310 watts into
16 ohms.
Input: ¼ inch unbalanced phone jacks.
Output: Color coded binding posts (banana jacks).
Output Impedance: Less than 7 milliohms in series
with less than 3 microhenries. See Figure 6.2.
Output Signal
Dual: Unbalanced, dual channel.
Bridge-Mono: Balanced, single channel.
Protection
Overall Protection: AC line fused. Thermal switch in
AC line protects against overheating caused by insuf-
ficient ventilation. Controlled slew rate voltage amplifi-
ers protect overall amplifier against RF burnouts. Input
overload protection is furnished by internal resistance
at inputs of amp.
Amplifier Output Protection: Short, mismatch, and
open circuit proof. Limiting is instantaneous with no
flyback pulses, thumps, cutout, etc. No premature lim-
iting on transients.
Turn-On: Instantaneous, with minimum thumps and no
program delay.
DC-300A II Power Amplifier