Input Connector (standard module): One per chan-
nel, 3-pin female XLR connector, in parallel with a
barrier strip termination.
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.
Level: A detented rotary level control for each channel
located on the rear panel.
Power: An on/off rocker switch located on the front
Input Stage: Input is electronically balanced and
employs precision 1% resistors.
Mode: A two-position switch located on the back
panel which, when turned to “Stereo,” operates
the ampliﬁer as two independent channels. When
Input Impedance (nominal): 20 k ohms, balanced.
10 k ohms, unbalanced.
Bridge” is selected, the ampliﬁer bridges the two
Input Sensitivity: Channel independent. Factory set at
output channels for twice the output voltage.
gain and 0.775 volt sensitivity available as a Service
.4 volts for standard 1 kHz, 8 ohm power. 26 dB
Rugged steel chassis is formed into a durable
package, then ﬁnished with environmentally friendly
powder coat for long life and ease of maintenance.
Channel Operation Switch: A two-position switch
located on the back panel which, when turned to
/8 Ohm, sets the ampliﬁer to drive low-imped-
Output Impedance: See Figure 1.
ance speaker loads. Turning the switch to 70V sets
the ampliﬁer to drive distributed high-impedance
speaker loads and inserts a 70 Hz high-pass ﬁlter into
the signal chain to prevent step-down transformer
Output Connectors: Four-terminal touch-proof barrier
block, one per channel.
Cooling: Proportional speed fan in CH1 and CH2;
3-speed fan in CH4.
Stereo: Unbalanced, two-channel.
Width: EIA Standard 19-inch rack mount (EIA RS-
Bridge-Mono: Balanced, single-channel. Channel 1
controls are active; Channel 2 should be turned
Signal: A green indicator for each channel which
ﬂashes when a very low-level signal (> –40 dBm) is
present at input. May be used for troubleshooting
Height: 5.25 inches (13.34 cm).
Depth (behind front mounting surface):
CH1 and CH2: 12.25 inches (31.11 cm) to back of
Contractor Series ampliﬁers 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.
Clip: A red indicator for each channel which turns
on when distortion becomes audible in the ampliﬁer
CH4: 16.25 inches (36.56 cm) to back of ampliﬁer.
CH4: 17.5 inches (14.45 cm) from back of front
rack ears to back of speaker-terminal cover.
Fault: A red indicator for each channel which indi-
cates ampliﬁer has muted output. Normally off. Status
may be monitored remotely by plugging into back-
panel RJ-11 Fault jack.
CH1: 40.6 lb (18.4 kg).
CH2: 48.3 lb (18.5 kg).
CH4: 33.4 lb (15.1 kg).
Power: A blue indicator that turns on when the ampli-
ﬁer has been turned on and has power.
For shipping weight, add 6 lb (2.7 kg).
Figure 1 CH1, CH2, and CH4 Output Impedance
Crown’s Three-Year, No-Fault, Fully Transferable Warranty
Crown Audio, Inc.
718 W. Mishawaka Rd.
Crown offers a Three-Year, No-Fault, Fully Transferable Warranty for every new Crown ampliﬁer—an unsur-
passed industry standard. With this unprecedented No-Fault protection, your new Crown ampliﬁer is warranted
to meet or exceed original speciﬁcations for the ﬁrst three years of ownership. During this time, if your ampliﬁer
fails, or does not perform to original speciﬁcations, 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 ampliﬁer.
Elkhart, IN 46517-9439
Speciﬁcations subject to change without prior notice. Latest
information available at www.crownaudio.com.
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.
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.