Power Series Amplifiers
P-4020, P-4040 Owner’s Manual
GENUINE JBL
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P-4020
P-4040
MADE IN THE U.S.A.
MADE IN THE U.S.A.
SPEAKER OUTPUTS
SPEAKER OUTPUTS
BRIDGE
BRIDGE
–+
POWER
REM
FUSE
POWER
REM
FRONT
F
U
S
E
–
L
R
+
+BATT
GND
–
L
+
–
R
+
20A
+BATT
GND
3
0
A
REAR
B
D
G
E
4
6
6
5
4
5
•
•
Always wear protective eyewear when
using tools.
When routing cables, keep input signal
cables away from power cables and
speaker wires.
SPKR LEVEL IN
REAR
LINE LEVEL
INPUT
LINE LEVEL
INPUT
AUX
OUT
AUX
OUT
SPEAKER LEVEL IN
+
R
–
–
L
+
FRONT
REAR
+
R
–
+
L
–
L
R
L
L
L
+
R
–
–
L
+
ONT
R
R
R
•
When making connections, make sure
that each connection is clean, insulated
and properly secured. Observe the
polarity markings on the rear panel.
Refer to the application drawings to set
up the amplifier for operation in stereo,
bridged-mono, bi-amp or tri-mode con-
figurations.
2
3
3
1
1
2
8
9
11
10
FRONT
REAR
PRE OUT
F+R EAR FRT
FLAT LP LP
2V
2V
2V
INUT
FRT REAR
INPUT MODE
MO ST
XOVER
XOVER
INPUT MODE
ST MO
INPUT MODE
MO ST
XOVER
LP HP FLAT
LP HP FLAT
FLAT HP LP
•
If the amplifier’s fuse must be replaced,
use only the same rating and type as a
replacement. Do not substitute another
kind.
4V
.250V
4V
.250V
LEL
LEL
4V
.250V
LEVEL
11
11
7
7
7
8
8
Controls and Connectors
1. Pre-amp Level Input Connector –
Connects to line-level output from the
source unit.
2. Universal Interface Speaker-Level
Connector – Connects to speaker-level
output from the source unit. Provides
Common Sense amplifier turn-on
when used with factory radios
(2-channel on P-4020, 4-channel on
P-4040).
3. Pre-amp Level Output Connector –
Connects to other amps or processors
in the signal chain (flat on P-4020, flat
or filtered on P-4040).
4. Speaker-Output Connector – (2-chan-
nel on P-4020, 4-channel on P-4040).
5. Fuses – P-4020: 20A ATC type, P-4040:
30A ATC type.
7. Input-Mode Switch – Sums left and
right inputs.
8. Input-Sensitivity Control – Adjusts
input sensitivity for pre-amp level and
speaker-level inputs.
9. Pre-amp Output Selector Switch –
Selects input path for pre-amp output.
Output can be summed from front and
rear inputs with no filter, or filtered by
the front or rear crossover.
10. Rear-Channel Input Selector – Selects
rear-channel input between front input
and rear input.
11. Crossover Selector – Determines
whether the crossover is a High-Pass
filter (HP), a Low-Pass filter (LP) or
unfiltered (Flat).
6. Power Connector – Connection for
12V+, Gnd and Rem.
3
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2. Locate the 3-connection barrier strip
labeled +Batt, Rem and Gnd. Connect a
black wire (at least 12G) to the Gnd ter-
minal and connect the other end to the
nearest bare-metal chassis component.
Then, connect a red wire (at least 12G)
from the vehicle’s +12-volt battery ter-
minal to the +Batt terminal on the bar-
rier strip. Finally, connect a blue wire
(16G) to the Rem terminal on the bar-
rier strip and connect the other end to
the Rem output of the source unit. (If
you are using speaker-level inputs and
speaker-level outputs from the source,
disregard the previous instruction
FREQUENCY INDUCTOR CAPACITOR
Crossover 6dB/oct. LP 6dB/oct. HP
2. If you are connecting the amplifier to
a factory-installed source unit, or to a
source unit that only has speaker-level
outputs, connect the speaker outputs
of the source to the speaker inputs on
the amp, observing the following color
codes:
Front Left+: White
Front Left–: White with black stripe
Front Right+: Gray
(4 ohm)
(4 ohm)
75Hz
100Hz
125Hz
150Hz
175Hz
200Hz
8.0mH
6.4mH
5.0mH
4.2mH
3.6mH
3.2mH
530µF
400µF
318µF
265µF
227µF
198µF
Mounting the Amplifier
Front Right–: Gray with black stripe
Rear Left+: Green
Rear Left–: Green with black stripe
Rear Right+: Purple
The JBL P-4020 (or P-4040) can be
mounted in virtually any location inside
the vehicle. However, make sure to keep
the amplifier away from heater vents or
ducts.
1. At the chosen site, use the amplifier as
a mounting template and mark the
locations of the four mounting holes.
2. Drill a small pilot hole at each marked
location.
3. If you are running the amp in tri-mode
(stereo and mono simultaneously to
one or two pairs of satellite speakers
and a subwoofer), refer to the chart
above to determine the capacitor and
inductor values you’ll need to route
bass signals to the woofer, and
midrange and high frequencies to the
satellite speakers.These passive
crossover components will also ensure
that the impedance of the speaker sys-
tem doesn’t drop below 2 ohms.
(Fig. 7)
regarding the Rem terminal.)
Rear Right–: Purple with black stripe
(Note: When using the Universal
Interface speaker-level inputs and line-
level outputs, the Rem terminal on the
amplifier may be used as a remote out-
put connection, and will provide power
to turn on other amplifiers and proces-
sors in the system.)
3. If you are connecting your Power
Series amplifier to a source unit with
output voltage higher than 4V, connect
the output-signal wires of the source
unit to the Universal Interface speaker
inputs. Because the inputs have an
impedance of 10K ohms, this connec-
tion will provide the best noise-free
performance possible.
Wiring the Speaker Output
Connections
1. Connect the speakers, observing
proper polarity, to the speaker output
barrier strip on the amplifier using at
least 16G high-quality speaker wire.
(Note: The total impedance of the
speakers connected to the outputs,
when the amp is driven in stereo,
must be at least 2 ohms.)
2. If you are bridging the amplifier, con-
nect the speaker wires to the terminals
marked “bridge,” observing proper
polarity. (Note: The total impedance of
the speaker system to be connected to
the amplifier must be at least 4 ohms
in bridge mode.)
3. Mount the amplifier and securely
tighten the mounting screws.
Wiring the Power Connections
Refer to diagrams on page 3 for connec-
tor locations.
1. For power, remote and speaker wires,
strip 1⁄4" off one end of each jacket to
reveal bare wire for insertion into the
barrier strip connectors.
Wiring the Input Connections
1. If you are using conventional RCA
input connections and a source unit
with output voltage less than 4V, sim-
ply plug the RCA plugs into the RCA
jacks on the amplifier.
4
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3. After adjusting the level of the main
speakers in your system, you should
adjust the remaining channels (if you
are using a P-4040 or a multi-amp
system) for the desired system bal-
ance.You’ll find this easiest to do by
adjusting the channels in the following
order: 1) front speakers, 2) rear speak-
ers, 3) subwoofer. Elaborate, multi-
channel systems may be complex to
adjust.Your local JBL installation spe-
cialist is the best person to help with
such an adjustment.
From
Source
Unit
IN4001 Diode
To
Amp
System Setup and Adjustment
Electronic Crossover
The electronic crossover in the P-4020 and
P-4040 should be used to route the appro-
priate signal to speakers intended to play
only bass, or only midrange and treble fre-
quencies.The crossover slope is 12dB/oct
and the frequency is fixed at 80Hz.
Pre-amp Outputs
Connect these to the input connectors of
other amplifiers or processors in your
system. Refer to the “Applications” sec-
tion for system expansion possibilities.
Setting Input Sensitivity
Proper input-sensitivity control settings
on Power Series amplifiers are critical to
ensure optimum performance, low noise
levels and maximum system reliability.
As a general rule, controls at the front
end of a system (source, equalizers and
other processors) should be set as high
as possible with the amplifier input sensi-
tivity set as low as possible while still
providing adequate volume levels. Using
a high signal level and a low-sensitivity
setting will help keep background noise
in the system to a minimum.
4. In some systems it may be desirable
to have two sources play simultane-
ously through the audio system. For
instance, if you have a factory-installed
radio in your car and you want to add
an aftermarket CD player, you may
connect the CD player to the RCA
inputs of the amp and the factory radio
to the Universal Interface speaker
inputs. (Note: Front and rear channels
of the CD and radio must be driven
into the front and rear inputs of the
amplifier. UseY adapters if necessary.)
The Universal Interface circuitry will
isolate the two signals from each other
while allowing them to drive the amp
simultaneously.Therefore, switching
from one source to the other is as sim-
ple as turning the unused source off,
and the other on. (Note: you must con-
nect the remote turn-on wire from the
CD player to the Rem terminal on the
amp. Install a diode in the remote line
from the CD player as shown in the
diagram above.)
1. Reconnect the (–) negative lead to your
vehicle’s battery. Apply power to the
audio system and play a favorite music
track from CD or tape. (Note: After the
source unit is on, the JBL badge (on the
top panel) will illuminate, indicating the
amplifier is on. If not, check the wiring,
especially the remote connection from
the source unit. Also refer to “Trouble-
shooting” on page 7.)
2. On the source unit, increase the volume
control until it is approximately 3/4 of
its maximum output level. Slowly
increase the Input Sensitivity control
(clockwise) toward three o’clock and,
at the same time, listen to the quality
of the reproduced sound. At some
point, you’ll hear distortion on the
music peaks. Stop the adjustment and
turn it back slightly.This is the maxi-
mum undistorted output level of your
system, and it should not be exceeded
during use.
Applications
For your convenience, we’ve included
several application diagrams to help you
plan your own system installation.
Figures 1 through 3 show how to config-
ure the JBL P-4020 or P-4040 for stereo,
bridged-mono and tri-mode operation.
For system expansion ideas, see Figures
4 and 5 on the next page. (Note: For sim-
plicity, Figures 1 through 5 do not show
power, remote and input connections.)
Many different system configurations are
possible using the crossovers and pre-
amp outputs featured in Power Series
amplifiers. If you are considering expand-
ing your system beyond what is shown
here, please consult your local JBL instal-
lation specialist, who is experienced in
designing complex mobile-audio systems.
Initially, turn the input sensitivity GAIN
control to its minimum (counterclock-
wise) position.
5
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MADE IN THE U.S.A.
SPEAKER OUTPUTS
Figure 4. In this example system,
the front channels of a P-4040
drive a pair of 5-1/4" 2-way speak-
ers, and the rear channels are
bridged to drive a single 12"
woofer.
BRIDGE
–+
POWER
REM
Figure 1.This wiring diagram shows
a JBL P-4020 amplifier set to stereo
to drive a pair of full-range speakers.
FUSE
20A
–
L
R
+
+BATT
GND
MADE IN THE U.S.A.
SPEAKER OUTPUTS
BRIDGE
POWER
REM
FRONT
F
U
S
E
–
L
+
–
R
+
+BATT
GND
3
0
A
REAR
B
R
I
D
G
E
2V
INPUT MODE
MO ST
XOVER
LP HP FLAT
FRONT
PRE OUT
F+R REAR FRT
FLAT LP LP
REAR
2V
2V
INPUT
FRT REAR
4V
.250V
INPUT MODE
MO ST
XOVER
XOVER
INPUT MODE
ST MO
LEVEL
LP HP FLAT
FLAT HP LP
4V
.250V
4V
.250V
LEVEL
LEVEL
MADE IN THE U.S.A.
SPEAKER OUTPUTS
BRIDGE
–+
Figure 2.This wiring dia-
gram shows a JBL P-4020
amplifier set to bridge
mode (mono) to drive a
single subwoofer.
MADE IN THE U.S.A.
POWER
REM
FUSE
20A
–
L
R
+
+BATT
GND
SPEAKER OUTPUTS
BRIDGE
–+
POWER
REM
FUSE
20A
–
L
R
+
+BATT
GND
SPKR LEVEL IN
REAR
LINE LEVEL
INPUT
AUX
OUT
FRONT
REAR
+
R
–
–
L
+
L
L
+
R
–
–
L
+
FRONT
R
R
2V
INPUT MODE
MO ST
XOVER
LP HP FLAT
LINE LEVEL
INPUT
AUX
OUT
SPEAKER LEVEL IN
2V
+
R
–
+
L
–
4V
.250V
LEVEL
INPUT MODE
MO ST
XOVER
LP HP FLAT
L
R
L
R
4V
.250V
LEVEL
MADE IN THE U.S.A.
SPEAKER OUTPUTS
BRIDGE
POWER
REM
FRONT
F
U
S
E
–
L
+
–
R
+
+BATT
GND
3
0
A
MADE IN THE U.S.A.
SPEAKER OUTPUTS
BRIDGE
–+
POWER
REM
FUSE
20A
–
L
R
+
+BATT
GND
REAR
B
R
I
D
G
E
Figure 3.This wiring diagram
shows a JBL P-4020 amplifier set
for tri-mode operation. For a
desired crossover frequency, use
the chart on page 4 to select an
inductor for the subwoofer, and
corresponding capacitors for left
and right speakers.
FRONT
REAR
XOVER
FLAT HP LP
PRE OUT
F+R REAR FRT
FLAT LP LP
2V
2V
INPUT MODE
MO ST
XOVER
INPUT MODE
ST MO
INPUT
FRT REAR
LP HP FLAT
4V
.250V
4V
.250V
LEVEL
LEVEL
2V
INPUT MODE
MO ST
XOVER
LP HP FLAT
Figure 5. In this expanded system, a JBL P-4040 drives two pairs of 6-1/2" 2-way speakers.
The JBL P-4040’s pre-amp outputs feed a JBL P-4020 to drive a single 12" subwoofer in
bridge mode.
4V
.250V
LEVEL
6
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Troubleshooting
Use the following guide to identify
symptoms and solve problems. Make
sure the vehicle’s electrical system is
working properly and power is reaching
the JBL P-4020 (or P-4040).
Declaration of Conformity
Symptom
Likely Cause
Solution
No audio
Low/no remote on voltage
Check connections; turn-test turn-on voltage
Speakers are not connected or are blown
Check wiring; use VOM/DVM to measure speaker-coil
resistance
We, JBL Europe A/S
Kongevejen 194B
DK-3460 Birkerød
DENMARK
Distorted audio
Input sensitivity is not set properly
See Setting Input Sensitivity on page 5
declare in own responsibility, that the products described
in this owner’s manual are in compliance with technical
standards:
Audio lacks “punch”
Speakers are wired with wrong polarity
Check polarity of connections; refer to Applications
Audio cycles off and on;
amber protection LED
(JBL badge on top panel)
is flashing
A protection circuit is turning the
amplifier off and on
Verify the following: off electrical system is
between 5 ~ 18Vdc; temperature is not
over 194°F (90°C); there are no short circuits; speaker
loads are not less than 2 ohms (4 ohms in mono)
EN 55013/A12/8.1994
EN 55020/12.1994
Audio cycles off and on;
amber protection LED
(on top panel) is flashing
GAIN is set too high
Set Input Sensitivity
correctly (see page 5)
Steen Michaelsen
JBL Europe A/S
Birkerød. DENMARK. 3/98
Fuse blows
Incorrect wiring or short circuit
Check connections; refer to Applications
7
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Specifications
P-4020, P-4040
Specifications
JBL P-4020
2 x 40 watts
2 x 50 watts
JBL P-4040
4 x 40 watts
4 x 50 watts
100 watts x 2
20Hz ~ 20kHz +0dB, –1dB
250mV ~ 4V
0.05 %
Power Output, 4 ohms:
Power Output, 2 ohms:
Power Output, Bridged 4 ohms: 100 watts
Frequency Response:
Input Sensitivity:
20Hz ~ 20kHz +0dB, –1dB
250mV ~ 4V
0.05 %
THD + Noise (4 ohms):
Signal-to-Noise:
>100dB
18A
>100dB
Maximum Current Draw:
Dimensions (W x H x L):
40A
7-5/8" x 2-1/4" x 8-3/4"
194 x 58 x 223mm
13-5/8" x 2-1/4" x 8-3/4"
347 x 58 x 223mm
JBL Consumer Products
250 Crossways Park Drive
Woodbury, NY 11797
Part No. SH1122
Made in USA
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