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– 3 –

Low-frequency sounds are
normally omnidirectional,
meaning the listener can’t
tell where they are generated
from. However, frequencies
between 75Hz – 150Hz can
be localized, especially at
higher volume levels.
Positioning your subwoofer
as recommended will provide
the most natural soundstage
and imaging from your loud-
speaker system. 

Remember that these are just
guidelines. Since every listen-
ing room is different, JBL
strongly recommends experi-
menting with the positioning
of your subwoofer to obtain
the most pleasing results in
your room. One technique that
can help you find the ideal 

subwoofer location is to tem-
porarily place the subwoofer
near the main listening loca-
tion. Then move around the
room and determine where you
hear the most pleasing bass
performance. This would then
be the ideal location for the
subwoofer.

When we designed the 
PSW-D112 powered subwoofer,
our goal was to offer the user
the best possible performance
combined with the most flexi-
ble and complete installation
options. Please look over the
following four examples to
determine which description
best matches your system and
follow the corresponding
hookup instructions.

PSW-D112  11/9/99  11:02 AM  Page 3

Note: If your receiver/proces-
sor contains Dolby* Digital or
DTS® surround processing
technology, then set the 
“Low-Pass” control on the
180Hz position.

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– 5 –

This method of hookup can
offer the highest level of 
performance for your 
complete loudspeaker system.
The PSW-D112 incorporates a
variable high-pass crossover
in addition to a variable low-

pass crossover. When hooked
up as shown, the subwoofer
will limit the low-frequency
information that is returned
to your receiver/amplifier.
Your receiver/amplifier does 
not need to waste valuable
power reproducing the low
frequencies. In addition,
since no low-frequency 
information is being sent 
to your main loudspeakers,
they are able to reproduce 
mid and high frequencies
with greater clarity.

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– 6 –

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.

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. 

• 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

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.

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. 

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