JBL STUDIOTM SERIES S120PII User Manual

Page 8

T R O U B L E S H O O T I N G

If you used the High Level
(speaker) inputs • and there
is no sound from any of the
speakers:

• Check that receiver/amplifier
is on and a source is playing.
• Check that powered
subwoofer is plugged into
an active electrical outlet
and is switched on £‚.
• 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.
Make sure no wires are
touching other wires or
terminals and creating a
short circuit.
• Review proper operation
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 that the
subwoofer is plugged into an
active electrical outlet and
that both power switches
are on £‚.
• Adjust the Crossover point
¢.
• Flip the Phase Control
switch ¡ to the opposite
position.
• If you are using a Dolby
Digital/DTS receiver or
processor, make sure that the
subwoofer adjustments on
the receiver/processor are
set up correctly. When using
the S120P

’s Speaker Level

inputs •, you should set your
receiver to configure the
main left and right speakers
as “LARGE”.
• Slowly turn the Level
Control ∞ clockwise until
you begin to hear the desired
amount of bass.

If you used the Line Level
inputs ¶ and there is no
sound from the subwoofer:

• Check that receiver/amplifier
is on and a source is playing.
• Check that powered
subwoofer is plugged into an
active electrical outlet and
that both Power switches
are on £‚.
• Check all wires and con-
nections between receiver/
amplifier and subwoofer.
Make sure all wires are
connected. Make sure none
of the wires are frayed, cut
or punctured.
• Review proper operation of
your receiver/amplifier.
• Slowly turn the Level
Control ∞ clockwise until
you begin to hear the desired
amount of bass.
• Make sure that you have
configured your receiver/
processor so that the
subwoofer/LFE output is on.

Phase Control

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.
There is no correct or
incorrect setting. Proper
phase adjustment depends on
several variables such as

subwoofer placement and
listener position. Adjust the
Phase switch ¡ to maximize
bass output at the listening
position.

Remember, 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 maximizes bass
performance.