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Operation
Power
Level Control
When the unit is plugged in
The subwoofer Level Control,
and no signal is received
located on the rear panel,
for approximately 10 – 15
adjusts the volume of the
minutes, the subwoofer will
subwoofer relative to the rest
go into a standby mode until
of the system. Proper level
a signal is present. Due to
adjustment depends on several
JBL's unique, high-efficiency
variables such as room size,
digital-amplifier design,
power consumption is minimal
when the subwoofer is not
receiving a signal.
Crossover Adjustments
Low-Pass Control
The Low-Pass control deter-
mines the highest frequency at
High
which the subwoofer reproduces
Pass
sounds. If your main speakers
can comfortably reproduce
some low-frequency sounds,
Level
set this control to a lower
frequency setting, between
50Hz – 100Hz. This will
Phase
concentrate the subwoofer's
efforts on the ultradeep bass
sounds required by today's
Low
Pass
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.
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.
High-Pass Control
• If you hooked up your sub-
120
woofer as shown in Hookup
90
150
3 on page 5, you also have
the capability of adjusting
60
180
the high-pass frequency.
The High-Pass control
determines the frequency at
Max
Min
which the main speakers
will start reproducing
180
0
sounds. If your main speak-
ers can comfortably repro-
120
duce some low-frequency
90
150
sounds, also set this con-
60
180
trol to a lower frequency
setting, between 50Hz –
100Hz. This will concen-
trate 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
Final adjustment and blending
to the lower bass frequencies,
of the low-pass and high-pass
set the high-pass crossover
controls may evolve over sev-
control to a higher setting,
eral listening sessions. A good
between 125Hz – 180Hz.
starting point would be to set
With this setting, your main
both the low- and high-pass
speakers will not have the
controls to the same frequency
burden of reproducing any
and adjust from that point.
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 sub-
woofer 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 speak-
ers will continue to get a
full-range signal.
– 6 –
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