PSW-D115 (serv.man2) - JBL Audio User Guide / Operation Manual. Page 6

– 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-
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.

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
pleasing 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/

amplifier incorporates a
high-pass crossover, your
main speakers 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.