SCS 138 SUB (serv.man2) - JBL Audio User Guide / Operation Manual. Page 5

Use this installation method for
Dolby Pro Logic applications
(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 phono cables 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 phono cables into the
line-level inputs on the
subwoofer.
Connect each speaker to the
corresponding speaker
terminals on your receiver or
amplifier.

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.”

Note:
When using the LFE input, the
subwoofer's Crossover control
is NOT active, because this
function is controlled by your
surround processor.
When using the LFE input, set
the subwoofer's Volume control
to "Max" and calibrate the
subwoofer level along with the
other speakers according to
the set-up instructions in the
owner's manual for your
surround receiver/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