Crown 2 Manual De Usuario
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Power Base Series Power Amplifiers
Page 14
Required AC Mains: Current, frequency and voltage
requirements are provided on each unit’s back panel.
All models draw 90 watts or less at idle.
requirements are provided on each unit’s back panel.
All models draw 90 watts or less at idle.
Power Base-1: Draws up to 6 amps of current.
Power Base-2 : Draws up to 10 amps of current.
Power Base-3 : Draws up to 15 amps of current.
Low-Voltage Power Supply: A ±24 VDC fanformer
supply (fan motor winding) regulated to ±15 VDC.
supply (fan motor winding) regulated to ±15 VDC.
AC Connector: An appropriate AC line cord and plug
are provided. 120 VAC, 60 Hz units have a standard
3-wire, 15-amp grounded connector (NEMA 5-15P).
are provided. 120 VAC, 60 Hz units have a standard
3-wire, 15-amp grounded connector (NEMA 5-15P).
Controls
Power: A front panel rocker switch used to turn the
amplifier on and off.
amplifier on and off.
Level: A back panel rotary potentiometer for each chan-
nel used to control the output level.
nel used to control the output level.
Stereo/Mono: A three-position back panel switch used
to select Stereo, Bridge-Mono or Parallel-Mono mode.
to select Stereo, Bridge-Mono or Parallel-Mono mode.
Sensitivity: A three-position switch inside the back
cover plate used to select the input sensitivity for both
channels: 0.775 volts or 1.4 volts for standard 1 kHz
power, or 26 dB voltage gain (see Section 2.3).
cover plate used to select the input sensitivity for both
channels: 0.775 volts or 1.4 volts for standard 1 kHz
power, or 26 dB voltage gain (see Section 2.3).
Input Ground Lift: A two-position back panel switch
used to isolate the phone jack and chassis grounds.
used to isolate the phone jack and chassis grounds.
Reset (
Power Base-3 only): A back panel push but-
ton used to reset the circuit breaker that protects the
power supplies.
power supplies.
Indicators
Power: This amber indicator shows the on/off status of
the low voltage power supply.
the low voltage power supply.
Input/Output
Input Connector: Balanced ¼ inch phone jacks. See
Section 5 for XLR and barrier block accessories.
Section 5 for XLR and barrier block accessories.
Input Impedance: Nominally 20 K ohms, balanced;
10 K ohms, unbalanced.
10 K ohms, unbalanced.
Output Connector: Two sets of color-coded 5-way bbinding
posts (for banana plugs, spade lugs or bare wire).
posts (for banana plugs, spade lugs or bare wire).
Output Impedance: Less than 10 milliohms in series
with less than 2 microhenries.
with less than 2 microhenries.
DC Output Offset: Less than 10 millivolts.
Output Signal
Stereo: Unbalanced, two-channel.
Bridge-Mono: Balanced, single-channel. Channel 1
controls are active; Channel 2 controls should be
turned down and not used.
controls are active; Channel 2 controls should be
turned down and not used.
Parallel-Mono: Unbalanced, single-channel. Channel
1 controls are active; Channel 2 controls should be
turned down and not used.
1 controls are active; Channel 2 controls should be
turned down and not used.
Protection
Power Base amplifiers are protected against shorted,
open or mismatched loads; overloaded power supplies;
excessive temperature, chain destruction phenomena,
input overload and high-frequency blowups. They also
protect loudspeakers from input and output DC, as well
as providing protection from turn-on/turn-off transients.
open or mismatched loads; overloaded power supplies;
excessive temperature, chain destruction phenomena,
input overload and high-frequency blowups. They also
protect loudspeakers from input and output DC, as well
as providing protection from turn-on/turn-off transients.
If operating conditions are unreasonable, the patented
ODEP circuitry proportionally limits the drive level to pro-
tect the output transistors, particularly in the case of el-
evated temperature. A thermal switch imbedded in the
transformer protects the power supplies from overload.
In the rare event that a transformer overheats, the ther-
mal switch removes power, waits until the unit has cooled
to a safe temperature and then resets itself.
ODEP circuitry proportionally limits the drive level to pro-
tect the output transistors, particularly in the case of el-
evated temperature. A thermal switch imbedded in the
transformer protects the power supplies from overload.
In the rare event that a transformer overheats, the ther-
mal switch removes power, waits until the unit has cooled
to a safe temperature and then resets itself.
Turn On: Four second delay with no dangerous tran-
sients. Contact us if you need to change the delay.
sients. Contact us if you need to change the delay.
Construction
Durable black finish on steel chassis with special “flow-
through” ventilation from front to side panels.
through” ventilation from front to side panels.
Cooling: Internal heat sinks with forced-air cooling
for rapid, uniform heat dissipation.
for rapid, uniform heat dissipation.
Dimensions: Standard 19-inch (48.3 cm) rack mount
width (EIA RS-310-B), 3.5-inch (8.9 cm) height and
16-inch (40.6 cm) depth behind the mounting surface.
width (EIA RS-310-B), 3.5-inch (8.9 cm) height and
16-inch (40.6 cm) depth behind the mounting surface.
Approximate Weight: Center of gravity is 6 inches
(15.2 cm) behind front mounting surface.
(15.2 cm) behind front mounting surface.
120 VAC, 60 Hz Units:
Power Base-1: 30 pounds (13.6 kg) net; 34 pounds
(15.4 kg) shipping weight.
(15.4 kg) shipping weight.
Power Base-2: 34 pounds (15.4 kg) net; 38 pounds
(17.2 kg) shipping weight.
(17.2 kg) shipping weight.
Power Base-3: 36 pounds (16.3 kg) net; 40 pounds
(18.2 kg) shipping weight.
(18.2 kg) shipping weight.