JBL L8400P (serv.man12) Service Manual ▷ View online
Parameter
Spec.
Unit
QA Test
Limits
Conditions
Notes
Amp Section
Phase switch
Phase switch
0-180
deg
functional
Volume pot Taper (lin/log)
LOG
--
functional
5K A Taper
Variable crossover 50-150 Hz
YES
functional
4th Order LP Filter, 2nd order fix and 2nd
order variable.
order variable.
HP Speaker out
YES
functional
Pass through from the speaker input section
LP On- Off Select switch
YES
--
functional
Disables LP filter, intended for LFE
On-Off indicators
YES
functional
Unit is provided with 2 LED's BLU-ON, RED-
OFF
OFF
Input Configuration
Line In (L,R) & LFE
Line In (L,R) & LFE
YES
--
functional
Dual RCA jack, L or R is used in LFE mode
Spkr/Hi Level In
YES
--
functional
Binding post connector L&R
Signal Sensing (ATO)
Auto-Turn-On (yes/no)
Auto-Turn-On (yes/no)
YES
functional Auto - on selection switch in Auto
ATO Input test frequency
50
Hz
functional "
Min ATO Level L or R Inputs
3
mV
functional
"
Single input driven
Min ATO Level Speaker in L
or R inputs
or R inputs
30
mV
functional
"
Single input driven
ATO Turn-on time
2
seconds
functional
Amp connected and AC on, then
input signal applied
input signal applied
Auto Mute/ Turn-OFF Time
5
minutes
17
(T) Time before muting, after
minimum ATO signal is removed
(3mV)
minimum ATO signal is removed
(3mV)
Auto turn of time (T) must be 5 > T < 17
Minutes
Minutes
Auto Mute/ Turn-OFF Time
15
Minutes
17
(T) Time before muting, after input
signal is removed
signal is removed
Auto turn of time (T) must be 10 > T < 17
Minutes
Minutes
Power on Delay time
2
sec.
4
AC Power Applied
Transients/Pops
ATO Transient
ATO Transient
5
mV-peak
n/a
@ Speaker Outputs
Turn-on Transient
50
mV-peak
1V-pk-pk @ Speaker Outputs
AC Line cycled from OFF to ON
Turn-off Transient
50
mV-peak
1V-pk-pk @ Speaker Outputs
AC Line cycled from ON to OFF
Efficiency
Efficiency
Efficiency
68
%
65
400W of output power
Nominal Line voltage 120 VAC
Stand-by Input Power
18
Watts
20
@ nominal line voltage, Amp in
OFF state, RED LED activated
OFF state, RED LED activated
Maximum allowable input power LED in
RED, Class D inactive
RED, Class D inactive
Stand-by Input Power
22
Watts
25
@ nom. line voltage, Amp in On
state, Green LED activated
state, Green LED activated
Maximum allowable input power under
nominal Input voltage and frequency, in
stand-by mode (HOT or COLD operation,
LED GREEN). Class D active but no signal
applied.
nominal Input voltage and frequency, in
stand-by mode (HOT or COLD operation,
LED GREEN). Class D active but no signal
applied.
Power Cons. @ 400W
584
Watts
615
@ nom. line voltage
400 Watts into 4 Ohms nominal line voltage
Protection
Thermal Protection
YES
functional @1/8 max unclipped Power
DC Offset Protection
YES
-
DC present at Speaker Out leads
Relay opens during a DC output condition
Line Fuse Rating
USA-Domestic 5
USA-Domestic 5
Amps
Type-T or Slo Blo-250 V
EU
2.5
Amps
Type-T , Low Breaking capacity-250
V
V
L
8400P
L
series
4
4
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:
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:
Use RCA-type interconnects
to connect the line-level
subwoofer outputs on your
receiver or amplifier to the
line-level inputs on the sub-
to connect the line-level
subwoofer outputs on your
receiver or amplifier to the
line-level inputs on the sub-
woofer. IMPORTANT: Make
sure that the LFE/Normal
toggle switch
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.
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.
NOTE: If your receiver or
amplifier only has one sub-
amplifier only has one sub-
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.
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 each speaker to
the corresponding speaker
terminals on your receiver
or amplifier.
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.”
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.
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.
Use this installation method for
Dolby Digital, DTS or other dig-
ital surround processors:
Dolby Digital, DTS or other dig-
ital surround processors:
Use either the left or right line-
level input jack for the Low-
Frequency Effects channel; it
doesn’t matter which one you
choose.
level input jack for the Low-
Frequency Effects channel; it
doesn’t matter which one you
choose.
IMPORTANT: Make sure that
the LFE/Normal toggle switch
∞ is in the “LFE” position.
This will bypass the sub-
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
the LFE/Normal toggle switch
∞ is in the “LFE” position.
This will bypass the sub-
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
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.
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.
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.
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.
DOLBY* DIGITAL OR DTS
®
(OR OTHER DIGITAL SURROUND MODE) CONNECTION
L8400P OM 6/8/05 4:10 PM Page 6
L8400P
L
series
5
5
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:
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:
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.
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.
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.
amplifier’s center, surround
and surround back speaker
terminals to the corresponding
terminals on the back of
your center and surround
speakers.
L8400P OM 6/8/05 4:10 PM Page 7
L8400P
L
series
6
OPERATION
Move the Master Power switch
¢ to the “On” position to use
the L8400P subwoofer.
¢ 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
for an extended period of time,
or if the subwoofer will not be
used, switch the Master
Power switch
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
• 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
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.
level so that the volume of the
bass information is pleasing
to you.
Crossover Adjustments
The Crossover Frequency
Control
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
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
6
L8400P OM 6/8/05 4:10 PM Page 8
L8400P
L
series
7
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