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OPERATION
Move the Master Power
switch
¢ to the “On” position to use
the L8400P subwoofer.
If you will be away from home
for an extended period of time,
or if the subwoofer will not be
used, switch the Master
Power switch ¢ to the “Off”
position.
The subwoofer Level Control
• adjusts the volume of the
subwoofer relative to the rest
of the system. Proper level
adjustment depends on sev-
eral variables such as room
size, subwoofer placement,
type of main speakers and
position. Adjust the subwoofer
level so that the volume of the
bass information is pleasing
to you.
Crossover Adjustments
The Crossover Frequency
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 fre-
quencies, set the low-pass
crossover control to a higher
setting, between 120Hz and
150Hz. This control is not used
when the LFE switch ∞ is in
the “LFE” position.
Level Control
Power
TROUBLESHOOTING
If you used the high-level
(speaker) inputs and there
is no sound from any of the
speakers:
•
Check that the receiver/
amplifier
is on and a source
is playing.
• Check that the powered
subwoofer is plugged into
an active electrical outlet
and is switched on.
• Check all wires and connec-
tions between the receiver/
amplifier and the speakers.
Make sure all wires are con-
nected. Make sure none of
the speaker wires are frayed,
cut or punctured, or touching
each other.
• Review proper operation
of your receiver/amplifier.
If there is low (or no) bass
output:
• Make sure the connections
to the left and right “Speaker
Inputs” have the correct
polarity (+ and –).
• Make sure that the sub-
woofer is plugged into an
active electrical outlet and
switched on.
• Adjust the crossover point.
• Flip the Phase Control switch
to the opposite position.
• If you are using a Dolby
Digital/DTS receiver or
processor, make sure that the
subwoofer and bass manage-
ment adjustments on the
receiver/processor are set up
correctly.
• Slowly turn the Level Control
clockwise until you begin to
hear the desired amount of
bass.
If you used the line-level
inputs and there is no sound
from the subwoofer:
•
Check that the receiver/
amplifier
is on and a source is
playing.
• Check that the powered
subwoofer is plugged into an
active electrical outlet and is
switched on.
• Check all wires and
connections between the
receiver/amplifier and the
subwoofer. Make sure all
wires are connected. Make
sure none of the wires are
frayed, cut or punctured, or
touching each other.
• Review proper operation of
your receiver/amplifier.
• Slowly turn the Level
Control clockwise until you
begin to hear the desired
amount of bass.
• Make sure that you have
configured your receiver/
processor so that the sub-
woofer/LFE output is on.
Phase Control
The Phase Control § deter-
mines whether the sub-
woofer’s pistonlike action
moves in and out in phase
with the main speakers or
opposite the main speakers.
There is no correct or incor-
rect setting. Proper phase
adjustment depends on sev-
eral variables such as sub-
woofer placement and lis-
tener position. Adjust the
Phase switch to maximize
bass output at the listening
position.
Remember, every system,
room and listener is different.
There are no right or wrong
settings; this switch offers the
added flexibility to adjust your
subwoofer for optimum per-
formance for your specific
listening conditions without
having to move your speakers.
If at some time in the future
you happen to rearrange your
listening room and move your
speakers, you should experi-
ment with the Phase switch in
both positions, and leave it in
the position that maximizes
bass performance.
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