SCS 138 Sub (serv.man11) - JBL Audio User Guide / Operation Manual. Page 9

Use this installation method
for Dolby Pro Logic appli-
cations (not Dolby Digital,
DTS

®

or other digital

processing), where the
receiver/processor is
equipped with a subwoofer
output, or a volume-controlled

preamp (line-) level output:
Use RCA-type patch cords 
to connect the line-level
subwoofer outputs on your
receiver or amplifier to the
line-level inputs on the
subwoofer. IMPORTANT: Do
not use the LFE input on the

subwoofer with Dolby
Pro Logic processors. Note: If
your receiver or amplifier only
has one subwoofer output
jack, then you will need to use
a Y-connector (not included).
Plug the male end of the Y-
connector into your receiver
or amplifier’s subwoofer
output jack, and connect each
of the two female ends to
separate RCA-type patch
cords. Finally, plug the RCA-
type patch cords into the line-
level inputs on the subwoofer.
Connect each speaker to the
corresponding speaker
terminals on your receiver or
amplifier.

Use this installation method for
Dolby Digital, DTS

®

or other

digital surround processors: 
Use the line-level input jack
marked “LFE” for the Low-
Frequency Effects channel.
Connect this jack to the LFE
output or subwoofer output 
on your receiver or amplifier.
Connect each speaker to the
corresponding speaker

terminals on your receiver or
amplifier.
Make sure that you have
configured your surround-
sound processor for
“Subwoofer On.” The front left,
front right, center and rear
speakers should all be set to
“Small.”