– 6 –
Operation
Power
When the unit is plugged in
and power is on and no signal
is received for approximately
10 – 15 minutes, the sub-
woofer will go into a standby
mode until a signal is present.
Due to JBL’s unique, high-
efficiency 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.
Note: If you hooked up your
subwoofer as shown in Hookup
3 on page 4, all crossover
adjustments are bypassed. All
crossover adjustments must
then be adjusted on the
receiver/processor.
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
are using smaller bookshelf
speakers that do not extend
Level Control
The subwoofer Level Control
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 sub-
woofer level so that the vol-
ume of the bass information
is pleasing to you.
Crossover Adjustments
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 on page 4, there
is no high-pass control.
Unless your receiver/
amplifier incorporates a
high-pass crossover, your
main speakers will continue
to get a full-range signal.
• If you hooked up your sub-
woofer as shown in Hookup 3
on page 4, all crossover
adjustments are bypassed.
All crossover adjustments
must then be adjusted on
the receiver/processor.
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
optimizes the subwoofer’s
performance for movie listen-
ing. When the video-contour
switch is “on,” the sub-
woofer’s performance is tai-
lored to deliver the impact
and excitement of today’s
movies. The green LED will
illuminate when the video-
contour switch is on.
