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Crown Audio, Inc.
1718 W. Mishawaka Rd.
Elkhart, IN 46517-9439
TEL: 574-294-8200
FAX: 574-294-8FAX
www.crownaudio.com
9/05 136706-1F
Controls
Level: A detented rotary level control for each channel
located on the rear panel.
Power: An on/off rocker switch located on the front
panel.
Mode: A two-position switch located on the back
panel which, when turned to “Stereo,” operates
the amplifi er as two independent channels. When
“Bridge” is selected, the amplifi er bridges the two
output channels for twice the output voltage.
Channel Operation Switch: A two-position switch
located on the back panel which, when turned to
4/8 Ohm, sets the amplifi er to drive low-imped-
ance speaker loads. Turning the switch to 70V sets
the amplifi er to drive distributed high-impedance
speaker loads and inserts a 70 Hz high-pass fi lter into
the signal chain to prevent step-down transformer
saturation.
Indicators
Signal: A green indicator for each channel which
fl ashes when a very low-level signal (> –40 dBm) is
present at input. May be used for troubleshooting
cable runs.
Clip: A red indicator for each channel which turns
on when distortion becomes audible in the amplifi er
output.
Fault: A red indicator for each channel which indi-
cates amplifi er has muted output. Normally off. Status
may be monitored remotely by plugging into back-
panel RJ-11 Fault jack.
Power: A blue indicator that turns on when the ampli-
fi er has been turned on and has power.
Input/Output
Input Connector (standard module): One per chan-
nel, 3-pin female XLR connector, in parallel with a
barrier strip termination.
Input Stage: Input is electronically balanced and
employs precision 1% resistors.
Input Impedance (nominal): 20 k ohms, balanced.
10 k ohms, unbalanced.
Input Sensitivity: Channel independent. Factory set at
1.4 volts for standard 1 kHz, 8 ohm power. 26 dB
gain and 0.775 volt sensitivity available as a Service
Option.
Output Impedance: See Figure 1.
Output Connectors: Four-terminal touch-proof barrier
block, one per channel.
Output Signal:
Stereo: Unbalanced, two-channel.
Bridge-Mono: Balanced, single-channel. Channel 1
controls are active; Channel 2 should be turned
down.
Protection
Contractor Series amplifi ers are protected against
shorted, open or mismatched loads; overloaded
power supplies; excessive temperature, chain
destruction phenomena, input overload damage and
high-frequency blowups. They also protect loudspeak-
ers from input/output DC, large or dangerous DC off-
sets and turn-on/turn-off transients.
Options
Service Options: SST-4622, SST-3632, SST-4632—
custom two-channel crossover networks with equal-
ization and delay purposely engineered for use with
JBL model 4622, 3632 and 4632 cinema speakers.
SST-SBSC 3632T, SST-SBSC 4632T—custom three-
channel crossover networks with CD-horn equaliza-
tion and mono-summed low-frequency outputs
similarly designed for use with JBL model 3632T and
4632T cinema speakers.
Construction
Rugged steel chassis is formed into a durable
package, then fi nished with environmentally friendly
powder coat for long life and ease of maintenance.
Cooling: Proportional speed fan in CH1 and CH2;
3-speed fan in CH4.
Dimensions:
Width: EIA Standard 19-inch rack mount (EIA RS-
310-B).
Height: 5.25 inches (13.34 cm).
Depth (behind front mounting surface):
CH1 and CH2: 12.25 inches (31.11 cm) to back of
amplifi er.
CH4: 16.25 inches (36.56 cm) to back of amplifi er.
CH4: 17.5 inches (14.45 cm) from back of front
rack ears to back of speaker-terminal cover.
Net Weight:
CH1: 40.6 lb (18.4 kg).
CH2: 48.3 lb (18.5 kg).
CH4: 33.4 lb (15.1 kg).
For shipping weight, add 6 lb (2.7 kg).
Specifi cations subject to change without prior notice. Latest
information available at www.crownaudio.com.
Crown and Crown Audio are registered trademarks of Crown
International. Other trademarks are the property of their
respective owners. Printed in U.S.A.
©2005 Crown Audio
®
, Inc.
Figure 1 CH1, CH2, and CH4 Output Impedance
CH1
CH2
CH4
Crown’s Three-Year, No-Fault, Fully Transferable Warranty
Crown offers a Three-Year, No-Fault, Fully Transferable Warranty for every new Crown amplifi er—an unsur-
passed industry standard. With this unprecedented No-Fault protection, your new Crown amplifi er is warranted
to meet or exceed original specifi cations for the fi rst three years of ownership. During this time, if your amplifi er
fails, or does not perform to original specifi cations, it will be repaired or replaced at our expense. About the
only things not covered by this warranty are those losses normally covered by insurance and those caused by
intentional abuse. And the coverage is transferable, should you sell your amplifi er.
See your authorized Crown dealer for full warranty disclosure and details. For customers outside of the USA,
please contact your authorized Crown distributor for warranty information or call 574-294-8200.
CH1, CH2
CH4