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Press the Master Power
Switch (marked Power 

¡) to

the ON position to use the
subwoofer. When your receiver
or amplifier is off, or is not
sending program material to
the subwoofer, the subwoofer
will be in standby mode. When
the subwoofer senses an audio
signal, it will automatically turn
itself on. If the subwoofer does

not sense a signal after
approximately twenty minutes,
it will automatically go into
standby mode. If you will be
away from home for an
extended period of time, or if
the subwoofer will not be used,
switch the Master Power
switch 

¡ to the "OFF" position.

200 Watts

IMPORTANT: CONNECT STRIPED WIRE  TO RED (    ) SPEAKER TERMINAL.

+

°

°

Volume can be adjusted using
the Subwoofer Volume Control
£, as shown.

The crossover filter between
the subwoofer and satellites
can be adjusted using the
Crossover Control 

¢. The

optimum setting for the 
SCS138 system is with the
Crossover Control 

¢ set to 

the "Max" position.

™

¢

¡

£

The Phase Control 

™ determines

whether the subwoofer’s piston-
like action moves in and out in
phase with the main speakers or
opposite the main speakers. This
is adjusted by pressing the button
to the 0°, or 180° position. The 0°
position of the phase button plays
the bass signal in phase with the
main speakers. The 180° position
plays the bass signal 180º, or out
of phase with the main speakers.
Proper phase adjustment depends
on several variables such as
subwoofer placement and listener
position. Adjust the phase switch
to optimize bass output at the
listening position.
Every system, room and listener is
different. There are no right or
wrong settings. This switch offers
the added flexibility to adjust your
subwoofer for optimum
performance for your specific
listening conditions without
having to move your speakers. If
at some time in the future you
happen to rearrange your listening
room, and move your speakers,
you should experiment with the
phase switch in both positions,
and leave it in the position that
optimizes bass performance for
your taste.

If there is no sound from any of
the speakers:
• Check that receiver/amplifier

is on and a source is playing.

• Check that the powered

subwoofer is plugged in, its
Power switch 

¡ is switched

on to the “ON•” position.

• Check all wires and

connections between
receiver/ amplifier and
speakers. Make sure all wires
are connected. Make sure
none of the speaker wires are
frayed, cut or punctured.

• Review proper operation of

your receiver/amplifier.

If there is no sound coming
from one speaker:
• Check the “Balance” control

on your receiver/amplifier.

• Check all wires and con-

nections between receiver/
amplifier and speakers. Make
sure all wires are connected.
Make sure none of the
speaker wires are frayed, cut
or punctured.

• In Dolby Digital or DTS

®

modes, make sure that the
receiver/processor is
configured so that the
speaker in question is
enabled.

If there is no sound from the
center speaker:
• Check all wires and

connections between
receiver/
amplifier and speaker. Make
sure all wires are connected.
Make sure none of the
speaker wires are frayed, cut
or punctured.

• If your receiver/processor is

set in Dolby Pro Logic mode,
make sure the center speaker
is not in phantom mode.

• If your receiver/processor 

is set in Dolby Digital or DTS

®

mode, make sure the
receiver/processor is con-
figured so that the center
speaker is enabled.

If the system plays at low
volumes but shuts off as
volume is increased:
• Check all wires and connecti-

ons between receiver/
amplifier and speakers. Make
sure all wires are connected.
Make sure none of the
speaker wires are frayed, cut
or punctured.

• If more than one pair of main

speakers is being used, check
the minimum impedance
requirements of your
receiver/amplifier.

If there is low (or no) bass 
output:
• Make sure the connections to

the left and right “Speaker
Inputs” have the correct
polarity (+ and –).

• Make sure the subwoofer is

plugged into an active
electrical outlet.

• Make sure the powered

subwoofer is plugged in and
switched on.

• In Dolby Digital or DTS

®

modes, make sure your
receiver/processor is
configured so that the
subwoofer and LFE output are
enabled.

If there is no sound from the
surround speakers:
• Check all wires and

connections between
receiver/ amplifier and
speakers. Make sure all wires
are connected. Make sure
none of the speaker wires are
frayed, cut or punctured.

• Review proper operation of

your receiver/amplifier and its
surround-sound features.

• Make sure the movie or TV

show you are watching is
recorded in a surround-sound
mode. If it is not, check to see
if your receiver/ amplifier has
other surround modes you
may use.

• In Dolby Digital or DTS

®

modes, make sure your
receiver/processor is
configured so that the
surround speakers are
enabled.

• Review the operation of your

DVD player and the jacket of
your DVD to make sure that
the DVD features the desired
Dolby Digital or DTS

®

mode,

and that you have properly
selected that mode using both
the DVD player’s menu and
the DVD disc’s menu.

Declaration of Conformity

We, Harman Consumer International

2, route de Tours 
72500 Château-du-Loir
France

declare in own responsibility, that the product

described in this owner’s manual is in

compliance with technical standards:

EN 60065:1998

EN 55013/A14:1999

EN 55020/A14:1999

EN 61000-3-2/A14:2000

EN 61000-3-3/1.1995

EN 50081-1:1992

EN 50082-1:1992

Luc Emmanuel Godard

JBL,

Harman Consumer International

France, 08/01

JBL Consumer Products

250 Crossways Park Drive, Woodbury, NY 11797

www.jbl.com 

©2001 JBL, Incorporated. 

JBL is a registered trademark of JBL, Incorporated.

Part No.1111-SCS138

Refinements may be made on occasion to existing products without notice, but will always meet or
exceed original specifications unless otherwise stated.
Simply Cinema is a registered trademark of JBL, Incorporated. 

*Dolby and Pro Logic are trademarks of Dolby Laboratories.

DTS

®

is a registered trademark of Digital Theater Systems, Inc.

Frequency Response (-6dB):

120Hz – 20kHz

Sensitivity (2.83V/1m):

86dB

Nominal Impedance:

4 Ohms

Recommended Amplifier Power

10 – 50 Watts RMS per Channel

Drive Units:

12mm Titanium Laminate Dome Video-shielded HF
75mm Paper Cone Video-shielded Midrange

Dimensions (H x W x D):

111mm x 81mm x 95mm (4.4" x 3.2" x 3.7")

Weight:

0.5kg (1.1lb)

Frequency Response (-6dB):

120Hz – 20kHz

Sensitivity (2.83V/1m):

88dB

Nominal Impedance:

4 Ohms

Recommended Amplifier Power

10 – 50 Watts RMS per Channel

Drive Units:

12mm Titanium Laminate Dome Video-shielded HF
Dual 75mm Paper Cone Video-shielded Midrange

Dimensions (H x W x D):

83mm x 194mm x 95mm (3.3" x 7.6" x 3.7")

Weight:

0.85kg (1.88lb)

Low Frequency Cut-off:

35Hz

High Frequency Cut-off:

40 Hz - 160Hz Variable

Built-in Power Amplifier:

100 Watts RMS

Drive Unit:

200mm Paper Cone Long Throw Driver. Bass Reflex Enclosure

Dimensions (H x W x D):

450mm x 250mm x 360mm (17.7" x 9.8" x 14.2")

Weight:

13.6kg (30lb)

Frequency Response (-6dB):

35Hz – 20kHz

DESIGN GOAL: Bring the thrill of live performance and movie sound to the
home environment by calling on JBL’s professional engineering leadership.

SATELLITE TYPE: Titanium-laminate-dome tweeter, sealed enclosure

SUBWOOFER TYPE: Bass-reflex enclosure

PORT DESIGN: FreeFlow™ flared

PROFESSIONAL REFERENCE: Cinema Loudspeaker Series