– 6 –
Operation
Power
When the unit is plugged in
and power is on and no signal
is received, the LED on the
front of the unit will turn red.
When a signal is present, the
LED will turn green. Note: It
will take several minutes for
the LED to turn from green to
red after the input signal to
the subwoofer is removed.
Due to JBL’s unique, high-effi-
ciency digital-amplifier design,
power consumption is minimal
when the subwoofer is not
receiving a signal. Of course,
the subwoofer can be turned
off, whenever desired.
Low-Pass Control
The Low-Pass control deter-
mines the highest frequency at
which the subwoofer reproduces
sounds. If your main speakers
can comfortably reproduce
some low-frequency sounds,
set this control to a lower
frequency setting, between
50Hz – 100Hz. This will
concentrate the subwoofer’s
efforts on the ultradeep bass
sounds required by today’s
films and music. If you are
using smaller bookshelf
speakers that do not extend to
the lower bass frequencies, set
the low-pass crossover control
to a higher setting, between
120Hz – 180Hz.
High
Pass
60
180
120
90
150
Low
Pass
60
180
120
90
150
High-Pass Control
• If you hooked up your sub-
woofer as shown in Hookup 4
on page 5, you also have
the capability of adjusting
the high-pass frequency.
The High-Pass control
determines the frequency at
which the main speakers
will start reproducing
sounds. If your main speak-
ers can comfortably repro-
duce some low-frequency
sounds, also set this
control to a lower frequency
setting, between 50Hz –
100Hz. This will concentrate
the subwoofer’s efforts to
the ultradeep bass sounds,
while your main speakers
continue to reproduce the
mid-bass information. If you
Level Control
The subwoofer Level Control,
located on the front panel,
adjusts the volume of the
subwoofer relative to the rest
of the system. Proper level
adjustment depends on several
variables such as room size,
subwoofer placement, type of
main speakers and listener
position. Adjust the subwoofer
level so that the volume of
the bass information is pleas-
ing to you.
Crossover Adjustments
are using smaller bookshelf
speakers that do not extend
to the lower bass frequencies,
set the high-pass crossover
control to a higher setting,
between 125Hz – 180Hz.
With this setting, your main
speakers will not have the
burden of reproducing any
low-frequency sounds.
• If you hooked up your sub-
woofer as shown in Hookup 1
on page 3, the high-pass
frequency is fixed at 180Hz.
• If you hooked up your
subwoofer as shown in
Hookup 2 or Hookup 3 on
page 4, no high-pass
control adjustments can be
made from the subwoofer.
Unless your receiver/ampli-
fier incorporates a high-pass
crossover, your main speak-
ers will continue to get a
full-range signal.
Final adjustment and blending
of the low-pass and high-pass
controls may evolve over sev-
eral listening sessions. A good
starting point would be to set
both the low- and high-pass
controls to the same frequency
and adjust from that point.
Video Contour
The video-contour switch,
located on the front panel,
optimizes the subwoofer’s
performance for movie listen-
ing. When the video-contour
switch is “on,” the subwoofer’s
performance is tailored to
deliver the impact and
excitement of today’s movies.
The green LED will illuminate
when the video-contour switch
is on.
PSW-D112 11/9/99 11:02 AM Page 6
