JBL 1500 ARRAY, Руководство по обслуживанию

Страница: 7 / 28

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.
1500 ARRAY OPERATION
Project Array OM 1/10/06 12:21 PM Page 9
6
1500 Array Subwoofer