SPECIFICATIONS
Model
L8400P
Description
12" (300mm), 600-Watt, high-performance compact powered subwoofer
Amplifier
Power (RMS)
600 Watts
Peak Dynamic
Power†
1200 Watts
Frequency
Response (–3dB) 22Hz – Low-pass crossover frequency
Low-Pass
Crossover
Frequencies
50Hz – 150Hz, Continuously adjustable
Low-Frequency
Transducer
™
12" (300mm) PolyPlas cone with rubber surround and cast-aluminum chassis;
™
™
™
HeatScape motor structure; Symmetrical Field Geometry (SFG ); oversized
fiberglass voice coil; magnetic shorting ring
Low diffraction, IsoPower
™
Baffle
Enclosure
Inputs
Sealed
Gold-plated 5-way binding-post speaker-level; left and right line-level,
switchable to LFE
Outputs
Gold-plated 5-way binding-post speaker-level; 150Hz high-pass when using
speaker-level connection
Dimensions
(H x W x D)
16-1/2" (15-1/2" without feet) x 15-1/2" x 15-1/2"
(419mm [394mm without feet] x 394mm x 394mm)
58 lb (26.4kg)
Weight
†The Peak Dynamic Power is measured by recording
the highest peak-to-center voltage produced by the
power amplifier with its limiters disabled, across
the output of a resistive load equal to minimum
impedance of the transducer, using a 50Hz sine wave
burst, 3 cycles on, 17 cycles off.
™
PRO SOUND COMES HOME
®
JBL Consumer Products, 250 Crossways Park Drive, Woodbury, NY 11797 USA
8500 Balboa Boulevard, Northridge, CA 91329 USA
2, route de Tours, 72500 Chateau du Loir, France
STUDIO™ L SERIES
© 2005 Harman International Industries, Incorporated. All rights reserved.
L8400P
Dolby and Pro Logic are registered trademarks of Dolby Laboratories.
DTS is a registered trademark of DTS, Inc.
JBL and Harman International are trademarks of Harman International
Industries, Incorporated, registered in the United States and/or other countries.
Part No. 354038-001
All features and specifications are subject to change without notice.
OWNER’S GUIDE
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DOLBY® DIGITAL OR DTS®
(OR OTHER DIGITAL SURROUND MODE) CONNECTION
DOLBY PRO LOGIC (NON-DIGITAL)
–
SPEAKER LEVEL
Use this installation method
for Dolby Pro Logic applica-
tions (not Dolby Digital, DTS
or other digital processing),
where the receiver/processor
does not have a subwoofer
output, or a volume-controlled
preamp (line-) level output:
IMPORTANT: Make sure that
the LFE/Normal toggle switch
∞ is in the “LFE” position.
This will bypass the sub-
the subwoofer from possible
damage. Connect this jack to
the LFE output or subwoofer
output on your receiver or
amplifier. Connect each
speaker to the corresponding
speaker terminals on your
receiver or amplifier.
woofer’s normal low-pass
filter, reducing the possibility
of signal degradation and more
accurately reproducing the
program materials. However, if
your receiver is passing a full-
range signal through its sub-
woofer output, place the tog-
gle switch in the “Normal”
position, which will activate
the low-pass filter and protect
Use this installation method for
Dolby Digital, DTS or other dig-
ital surround processors:
Connect your receiver or
amplifier’s front left and right
speaker terminals to the left
and right terminals on the
subwoofer that are marked
“Speaker Level In.” Connect
the left and right terminals
on the subwoofer that are
marked “Speaker Level Out” to
the corresponding terminals on
the back of your front left and
right speakers.
Make sure that you have con-
figured your surround sound
processor for “Subwoofer On.”
Also, remember to configure
your receiver for 5.1-, 6.1- or
7.1-channel operation as
appropriate.
Use either the left or right line-
level input jack for the Low-
Frequency Effects channel; it
doesn’t matter which one you
choose.
DOLBY PRO LOGIC® (NON-DIGITAL)
–
LINE LEVEL
Use this installation method
for Dolby Pro Logic applica-
tions (not Dolby Digital, DTS
or other digital processing),
where the receiver/processor
is equipped with a subwoofer
output, or a volume-controlled
preamp (line-) level output:
woofer. IMPORTANT: Make
sure that the LFE/Normal
toggle switch ∞ is in the
“Normal” position. This will
activate the subwoofer’s low-
pass filter, protecting the sub-
woofer from possible damage
and enabling it to operate most
efficiently by reproducing only
the low-frequency materials
that it is best at handling.
woofer output jack, then you
will need to use a Y-connector
(not included). Plug the male
end of the Y-connector into
your receiver or amplifier’s
subwoofer output jack, and
connect each of the two
female ends to separate RCA-
type interconnects. Finally,
plug the RCA-type intercon-
nects into the line-level inputs
on the subwoofer.
Connect your receiver or
amplifier’s center, surround
and surround back speaker
terminals to the corresponding
terminals on the back of
your center and surround
speakers.
Use RCA-type interconnects
to connect the line-level
subwoofer outputs on your
receiver or amplifier to the
line-level inputs on the sub-
NOTE: If your receiver or
amplifier only has one sub-
Connect each speaker to
the corresponding speaker
terminals on your receiver
or amplifier.
Make sure your receiver or
processor is correctly config-
ured to indicate that the sub-
woofer is “On.”
Note for advanced users: If
your receiver/processor has
a built-in low-pass crossover
filter for the subwoofer output,
you may switch the LFE/
Normal toggle switch to the
“LFE” position to bypass the
subwoofer’s internal
crossover.
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Phase Control
OPERATION
Power
Move the Master Power switch If you will be away from home
used, switch the Master
Power switch ¢ to the “Off”
position.
¢ to the “On” position to use
for an extended period of time,
or if the subwoofer will not be
the L8400P subwoofer.
Phase switch to maximize
bass output at the listening
position.
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.
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
Level Control
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
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.
TROUBLESHOOTING
If you used the high-level
(speaker) inputs and there
is no sound from any of the
speakers:
If there is low (or no) bass
output:
If you used the line-level
inputs and there is no sound
from the subwoofer:
Crossover Adjustments
• Make sure the connections
to the left and right “Speaker
Inputs” have the correct
polarity (+ and –).
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.
•
Check that the receiver/
•
Check that the receiver/
amplifier is on and a source is
playing.
amplifier is on and a source
is playing.
• Make sure that the sub-
woofer is plugged into an
active electrical outlet and
switched on.
• Check that the powered
subwoofer is plugged into an
active electrical outlet and is
switched on.
• Check that the powered
subwoofer is plugged into
an active electrical outlet
and is switched on.
• Adjust the crossover point.
• Check all wires and
• 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.
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.
• 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.
• Review proper operation of
your receiver/amplifier.
• Review proper operation
of your receiver/amplifier.
• Slowly turn the Level
Control clockwise until you
begin to hear the desired
amount of bass.
• 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.
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