Crown 460 CSL Reference Manual - Page 12
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Sufficient AC power must be provided to the amplifier.
Amplifiers cannot create energy—they require proper
voltage and current to deliver the power you expect.
Low-Voltage Power Supply: A ±24 VDC fanformer
supply (fan motor winding) regulated to ±15 VDC.
AC Connector: An appropriate AC line cord and plug
are provided. North American units have a standard
3-wire, 15 amp grounded connector (NEMA 5-15P).
Controls
Enable: A front panel rocker switch used to turn the
amplifier on and off.
Level: A back panel rotary potentiometer for each chan-
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.
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).
Ground Lift: A two-position back panel switch used to
isolate the phone jack input ground from the AC ground.
Reset ( 1400 CSL only): A back panel push button used to
reset the circuit breaker that protects the power supplies.
Indicators
Enable: This amber indicator shows the on/off status
of the low voltage power supply.
Input/Output
Input Connector: Two balanced ¼ inch phone jacks.
See Section 5 for XLR and barrier block accessories.
Input Impedance: Nominally 20 K ohms, balanced;
10 K ohms, unbalanced.
Output Connector: Two sets of color-coded 5-way bind-
ing posts (for banana plugs, spade lugs or bare wire).
Output Impedance: Less than 10 milliohms in series
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 should not be used.
Parallel-Mono: Unbalanced, single-channel. Channel
1 controls are active; Channel 2 should not be used.
Page 12
Protection
CSL series amplifiers are protected against shorted,
open or mismatched loads; overloaded power sup-
plies; excessive temperature, chain destruction phe-
nomena, input overload damage 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
protect 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 resets itself. Con-
trolled slew rate voltage amplifiers protect the unit from
RF burnouts, and current-limiting resistance protects
the input circuitry from overload. (Refer to Section 3.3.)
Turn On: No dangerous transients. The four second
(approximate) turn-on delay can be changed. Contact
Crown's Technical Support Group for details.
Construction
Durable black finish on steel chassis with special "flow-
through" ventilation from front to side panels.
Cooling: Internal heat sinks with forced air cooling 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.
Approximate Weight: Center of gravity is 6 inches (15.2
cm) behind front mounting surface.
120 VAC, 60 Hz Units:
460 CSL : 30 pounds (13.6 kg) net; 34 pounds
(15.4 kg) shipping weight.
800 CSL : 34 pounds (15.4 kg) net; 38 pounds
(17.2 kg) shipping weight.
1400 CSL : 36 pounds, 2 ounces (16.4 kg) net;
40 pounds (18.2 kg) shipping weight.
International Units:
460 CSL : 30 pounds, 12 ounces (14.0 kg) net;
35 pounds, 1 ounce (15.9 kg) shipping weight.
800 CSL : 35 pounds, 10 ounces (16.2 kg) net;
39 pounds, 11 ounces (18.0 kg) shipping weight.
1400 CSL : 37 pounds, 3 ounces (16.9 kg) net;
40 pounds, 15 ounces (18.6 kg) shipping weight.
CSL Series Power Amplifiers