Power Series Amplifiers
P-7520, P-7540, P-2510 Owner’s Manual
GENUINE JBL
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P-7540
6
P-7520
4
5
4
5
6
MADE IN THE U.S.A.
MADE IN THE U.S.A.
SPEAKER OUTPUTS
BRIDGE
SPEAKER OUTPUTS
POWER
REM
BRIDGE
+–
POWER
REM
FRONT
FUSE
30A
FUSE
30A
USE
30A
–
L
–
R
+
–
L
R
+
+BATT
ND
+BATT
GND
REAR
BRIDGE
2
2
3
1
1
3
•
•
Always wear protective eyewear when
using tools.
When routing cables, keep input signal
cables away from power cables and
speaker wires.
SPKR LEVEL IN
R
LINE LEVEL
INPUT
LINE LEVEL
INPUT
AUX
OUT
AUX
OUT
SPEAKEVEL IN
+R–
–L+
FRONT
REAR
+
R
–
+
L
–
L
L
L
L
+R–
–L+
FRONT
R
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.
8
10
8
12
7
9
12
11
8
FRONT
XOVER
FLAT HP LP
REAR
XOVER
FLAT HP LP
PRE OUT
F+R REAR FRT
FLAT LP LP
2V
80Hz
FRE
2V
XOVER 80Hz
AMP
80Hz XOVER
AMP
2V
INPUT MODE
MO ST
XOVER
LP FLAT
INPUT MODE
MO ST
INPUT
FRT REAR
INPUT MODE
ST MO
PRE OUT
LP HFLAT
4V
.250V
32Hz
320Hz
6V
.250V
LEVEL
32Hz
320Hz
32Hz
320Hz
4V
.250V
LEVEL
LEVEL
•
If the amplifier’s fuse must be replaced,
use only the same rating and type as a
replacement. Do not substitute another
kind.
11
9
11
12
7
7
3. Pre-amp Level Output Connector –
Connects to other amps or processors
in the signal chain.
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-7520, 4-channel on
P-7540).
8. Input Sensitivity Control – Adjusts
input sensitivity for pre-amp level and
speaker-level inputs.
4. Speaker-Output Connector – (2-chan-
nel on P-7520, 4-channel on P-7540).
5. Fuses – P-7520: 30A ATC type, P-7540:
30A ATC type x 2, P-2510: 40A ATC
type.
6. Power Connector – Connection for
12V+, Gnd and Rem.
7. Input-Mode Switch – Sums left and
right 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), Low-Pass filter (LP) or
unfiltered (flat).
12. Crossover Frequency Control –
Determines the crossover frequency
for the amplifier channels (front or
rear) and the pre-amp outputs.
3
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P-2510
6
4
2
5
1
FREQUENCY INDUCTOR CAPACITOR
Crossover 6dB/oct. LP 6dB/oct. HP
MADE IN THE U.S.A.
(4 ohm)
(4 ohm)
UNIVERSAL IRFACE
REA
LINE LEVEL
INPUT
SPEAKER OUTPUTS
POWER
REM
+
R
–
–
L
+
FRONT
REAR
FUSE
40A
+
+
–
–
+
BATT
GND
75Hz
100Hz
125Hz
150Hz
175Hz
200Hz
8.0mH
6.4mH
5.0mH
4.2mH
3.6mH
3.2mH
530µF
400µF
318µF
265µF
227µF
198µF
L
+
R
–
–
L
+
FRONT
R
12
8
2V
80Hz
FREQ
4V
.250V
32Hz
320Hz
LEVEL
Wiring the Power Connections
Refer to diagrams on pages 3 and 4 for
connector 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.
2. Locate the 3-connection barrier strip
labeled +Batt, Rem and Gnd. Connect a
black wire (at least 10G) to the Gnd ter-
minal and connect the other end to the
nearest bare-metal chassis component.
Then, connect a red wire (at least 10G)
from the vehicle’s +12-volt battery
terminal to the +Batt terminal on the
barrier strip. Finally, connect a blue
wire (16G) to the Rem terminal on the
barrier 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 instruc-
tion regarding the Rem terminal.
Wiring the Speaker Output
Connections
3. If you are running either the P-7520 or
the P-7540 in tri-mode (stereo and
mono simultaneously to one or two
pairs of satellite speakers and a sub-
woofer), refer to the chart above to
determine the capacitor and inductor
values you’ll need to route bass sig-
nals to the woofer, and midrange and
high frequencies to the satellite speak-
ers.These passive-crossover compo-
nents will also ensure that the imped-
ance of the speaker system doesn’t
drop below 2 ohms.The P-2510 should
be used to drive woofers only as its
bandwidth is limited to 20Hz – 320Hz.
1. Connect the speakers, observing prop-
er polarity, to the speaker-output barri-
er 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. Because the P-2510 is a
single-channel amplifier, the speaker
connections on the barrier strip are
wired in parallel inside the amp.The
total impedance of the speakers con-
nected to the P-2510 must be at least 2
ohms.)
2. If you are bridging the amplifier, con-
nect the speaker wires to the termi-
nals marked “bridge,” observing prop-
er polarity. (Note:The total impedance
of the speaker system to be connected
to the amplifier must be at least 4
ohms in bridge mode.)
Mounting the Amplifier
The JBL P-7520, P-7540 or P-2510 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.
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.
3. Mount the amplifier and securely
tighten the mounting screws.
4
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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-code:
Front Left+: White
Front Left–: White with black stripe
Front Right+: Gray
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 facto-
ry 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 neces-
sary.) 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 simple as turning the
unused source off and the other on.
(Note:You must connect 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 on
this page.)
quency is variable from 32Hz – 320Hz.
From
Source
Unit
IN4001 Diode
To
Amp
Pre-amp Outputs
Connect these to the input connectors of
other amplifiers or processors in your
system.
Initially, turn the input sensitivity GAIN
control to its minimum (counterclock-
wise) position (refer to Figure 9).
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 illumi-
nate, indicating the amplifier is on. If
not, check the wiring, especially the
remote connection from the source
unit. Also refer to “Troubleshooting”
on the next page.)
2. On the source unit, increase the
volume control until it is approxi-
mately 3/4 of its maximum output
level. Slowly increase the Input
Sensitivity control (clockwise)
towards 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 maximum
undistorted output level of your sys-
tem, and it should not be exceeded
during use.
The crossover-selector switch determines
which filter will be assigned to the pre-
amp outputs.The pre-amp outputs may
be High Pass (switch set to HP), Low Pass
(switch set to LP) or unfiltered (switch set
to Flat).The crossover-frequency is deter-
mined by the crossover frequency control
and will be the same frequency as the
amplifier channels affected by that con-
trol.
Front Right–: Gray with black stripe
Rear Left+: Green
Rear Left–: Green with black stripe
Rear Right+: Purple
Rear Right–: Purple with black stripe
(Note: When using the Universal
Interface speaker-level inputs and
speaker-level outputs, the Rem termi-
nal on the amplifier may be used as a
remote output connection and will
provide power to turn on other ampli-
fiers and processors in the system.)
(Note:The front and rear inputs on the
P-2510 are summed to mono inside the
amp, and will provide constant bass
regardless of the position of source
unit balance and fader controls.)
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.
Refer to the “Applications” section 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.
System Setup and Adjustment
Electronic Crossover
The electronic crossover in the P-7520,
P-7540 and P-2510 should be used to
route the appropriate signal to speakers
intended to play only bass, midbass or
midrange and treble frequencies.The
crossover slope is 12dB/oct and the fre-
5
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Figure 1.This wiring diagram shows a
JBL P-7520 amplifier set to stereo to
drive a pair of full-range speakers.
Figure 5. In this expanded system, a JBL
P-7540 drives two pairs of 5-1/4" 2-way
speakers.The JBL P-7540’s pre-amp out-
puts feed a JBL P-2510, which drives a
single 12" subwoofer.
MADE IN THE U.S.A.
MADE IN THE U.S.A.
SPEAKER OUTPUTS
SPEAKER OUTPUTS
BRIDGE
+–
POWER
REM
FUSE
30A
POWER
REM
–
L
R
+
+BATT
GND
FUSE
40A
+
+
–
–
+BATT
GND
2V
80Hz
FREQ
INPUT MODE
MO ST
XOVER
LP HP FLAT
PRE OUT
LP HP FLAT
2V
80Hz
FREQ
SPKR LEVEL IN
REAR
LINE LEVEL
INPUT
AUX
OUT
+R–
–L+
FRONT
REAR
4V
.250V
32Hz
320Hz
LEVEL
4V
.250V
32Hz
320Hz
L
L
LEVEL
+R–
–L+
FRONT
R
R
MADE IN THE U.S.A.
7
SPEAKER OUTPUTS
BRIDGE
+–
Figure 2.This wiring diagram shows a
JBL P-7520 amplifier set to bridge mode
(mono) to drive a single subwoofer or a
pair of subwoofers (P-7540).
POWER
REM
MADE IN THE U.S.A.
+
FUSE
30A
–
L
R
+
+BATT
GND
SPEAKER OUTPUTS
BRIDGE
POWER
REM
FRONT
FUSE
30A
FUSE
30A
–
L
+
–
R
+
BATT
GND
UNIVERSAL INTERFACE
REAR
LINE LEVEL
INPUT
+
R
–
–
L
+
FRONT
REAR
L
+
R
–
–
L
+
REAR
BRIDGE
FRONT
R
2V
80Hz
INPUT MODE
MO ST
XOVER
LP HP FLAT
PRE OUT
LP HP FLAT
4V
.250V
32Hz
320Hz
FREQ
LEVEL
FRONT
XOVER
FLAT HP LP
REAR
XOVER
FLAT HP LP
PRE OUT
F+R REAR FRT
FLAT LP LP
2V
XOVER 80Hz
AMP
80Hz XOVER
AMP
2V
INPUT MODE
MO ST
INPUT
FRT REAR
INPUT MODE
ST MO
6V
.250V
32Hz
320Hz
32Hz
320Hz
4V
.250V
LEVEL
LEVEL
Figure 3.This wiring diagram shows a
JBL P-7520 amplifier set for tri-mode
operation. For a desired crossover fre-
quency, use the chart on page 4 to select
an inductor for the subwoofer, and cor-
responding capacitors for left and right
speakers.
MADE IN THE U.S.A.
SPEAKER OUTPUTS
BRIDGE
+–
POWER
REM
FUSE
30A
–
L
R
+
+BATT
GND
2V
80Hz
INPUT MODE
MO ST
XOVER
LP HP FLAT
PRE OUT
LP HP FLAT
Applications
3. After adjusting the level of the main
speakers in your system, you should
adjust the remaining channels (if you
4V
.250V
32Hz
320Hz
FREQ
LEVEL
For your convenience, we’ve included
several application diagrams to help
you plan your own system installation.
Figures 1 through 4 show how to con-
figure the JBL P-7520, P-7540 or P-2510
for stereo, bridged-mono and tri-mode
operation.
are using a P-7540 or a multi-amp sys-
tem) for the desired system balance.
You’ll find this easiest to do by adjust-
ing 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.
Figure 4. In this example system, the
front channels of a JBL P-7540 drive
a pair of 5-1/4" speakers.The JBL P-7540’s
rear channels are bridged to drive a
single 12" subwoofer.
MADE IN THE U.S.A.
+
SPEAKER OUTPUTS
BRIDGE
POWER
REM
FRONT
FUSE
30A
FUSE
30A
–
L
+
–
R
+
BATT
GND
For system expansion ideas, see Figure
5 on the previous page. (Note: For sim-
plicity, Figures 1 through 5 do not show
power, remote and input connections.)
REAR
BRIDGE
FRONT
XOVER
FLAT HP LP
REAR
XOVER
FLAT HP LP
PRE OUT
2V
XOVER 80Hz
AMP
80Hz XOVER
AMP
2V
INPUT MODE
MO ST
F+R REAR FRT
FLAT LP LP
INPUT
FRT REAR
INPUT MODE
ST MO
6V
.250V
32Hz
320Hz
32Hz
320Hz
4V
.250V
LEVEL
LEVEL
6
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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
Many different system configurations are
possible using the crossovers and pre-
amp outputs featured in Power Series
amplifiers. If you are considering
expanding you system beyond what is
shown here, please consult your local
JBL installation specialist, who is experi-
enced in designing complex mobile-
audio systems.
Distorted audio
Input sensitivity is not set properly
See Setting Input Sensitivity on page 5
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 ~ 18 Vdc; 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)
Troubleshooting
Audio cycles off and on; amber
protection LED (on top panel)
is flashing
GAIN is set too high
(see previous page)
Set Input Sensitivity correctly
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 amplifier.
Fuse blows
Incorrect wiring or short circuit
Check connections; refer to Applications
7
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Specifications
P-7520, P-7540, P-2510
Specifications
JBL P-7520
JBL P-7540
4 x 75 watts
4 x 100 watts
2 x 200 watts
20Hz ~ 20kHz +0dB, –1dB
250mV ~ 4V
0.05 %
JBL P-2510
Declaration of Conformity
Power Output, 4 ohms:
Power Output, 2 ohms:
2 x 75 watts
2 x 100 watts
1 x 250 watts
1 x 375 watts
Power Output, Bridged 4 ohms: 200 watts
We, JBL Europe A/S
Frequency Response:
Input Sensitivity:
20Hz ~ 20kHz +0dB, –1dB
20Hz ~ 320Hz +0dB, –1dB
Kongevejen 194B
DK-3460 Birkerød
DENMARK
250mV ~ 4V
0.05 %
250mV ~ 4V
0.1 %
THD + Noise (4 ohms):
Signal-to-Noise:
declare in own responsibility, that the products described
in this owner’s manual are in compliance with technical
standards:
>100dB
35A
>100dB
>100dB
41A
Maximum Current Draw:
Dimensions (w x h x l):
64A
EN 55013/A12/8.1994
EN 55020/12.1994
13-5/8" x 2-1/4" x 8-3/4"
347 x 58 x 223mm
21-5/8" x 2-1/4" x 8-3/4"
550 x 58 x 223mm
7-5/8" x 2-1/4" x 8-3/4"
194 x 58 x 223mm
Steen Michaelsen
JBL Europe A/S
Birkerød. DENMARK. 3/98
JBL Consumer Products
250 Crossways Park Drive
Woodbury, NY 11797
Part No. SH1124
Made in USA
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