CSL Series Power Amplifiers
Page 12
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.
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.
