1500 ARRAY (serv.man11) - JBL Audio User Guide / Operation Manual. Page 9

Power On
Plug your subwoofer’s AC cord
into a wall outlet. Do not use the
outlets on the back of the
receiver.

Initially set the Subwoofer Level
(Volume) Control ¢ to the
“min” position.

Turn on your sub by pressing
the Power Switch ª on the
rear panel. 

Auto On/Standby
With the Power Switch ª
in the “on” position, the Power
Indicator LED £ will remain
backlit in red or green to
indicate the On/Standby 
mode of the subwoofer.

RED = STANDBY (No signal
detected, Amp Off)

GREEN = ON (Signal detected,
Amp On)

The subwoofer will auto-
matically enter the Standby
mode after approximately 10
minutes when no signal is
detected from your system. The
subwoofer will then power ON
instantly when a signal is
detected. During periods of
normal use, the Power Switch
ª can be left on. You may turn
off the Power Switch ª for
extended periods of non-
operation, e.g., when you are
away on vacation.

If the Auto Switch • is in the
“on” position, the subwoofer
will remain on.

Adjust Level
Turn on your entire audio
system and start a CD or movie 
soundtrack at a moderate level.
Turn up the Subwoofer Level
(Volume) Control ¢ about
halfway. If no sound emanates
from the subwoofer, check the
AC-line cord and input cables.
Are the con-nectors on the
cables making proper contact?
Is the AC 
plug connected to a “live”
receptacle? Has the Power
Switch ª been pressed to 
the “on” position? Once you
have confirmed that the sub-
woofer is active, proceed by
playing a CD or movie. Use a
selection that has ample bass
information.

Set the overall volume control
of the preamplifier or stereo 
to a comfortable level. Adjust
the Subwoofer Level (Volume)
Control ¢ until you obtain a
pleasing blend of bass. Bass
response should not over-
power the room but rather
should be adjusted so there is a
harmonious blend across the
entire musical range. Many
users have a tendency to set
the subwoofer volume too loud,
adhering to the belief 
that a subwoofer is there to
produce lots of bass. This is not
entirely true. A subwoofer is
there to enhance bass,
extending the response of 
the entire system so the bass
can be felt as well as heard.
However, overall balance 
must be maintained or the
music will not sound natural. An
experienced listener will set the
volume of the sub-woofer so its
impact on bass response is
always there but never
obtrusive.

Crossover Adjustments
NOTE: This control will have 
no effect if the LP/LFE Selector
Switch ¶ is set to “LFE.” If you
have a Dolby Digital or DTS
processor/receiver, the
Crossover Frequency is set 
by the processor/receiver.
Consult your owner’s manual to
learn how to view or change
this setting.

The Crossover Adjustment
Control ∞ determines 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 and
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 Crossover
Adjustment Control to a higher
setting, between 120Hz and
150Hz.

Phase Control
The Phase Switch § deter-
mines whether the subwoofer
speaker’s pistonlike action
moves in and out with the main
speakers (0˚) or opposite the
main speakers (180˚). Proper
phase adjustment depends 
on several variables, such as
subwoofer placement and
listener position. Adjust the
Phase Switch to maximize bass
output at the listening position. 

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