Read JBL L8400P (serv.man12) Service Manual 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
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