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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-7540 or a multi-amp
system) for the desired system
balance. You’ll find this easiest to do
by adjusting the channels in the
following order: 1) front speakers, 2)
rear speakers, 3) subwoofer.
Elaborate, multi-channel systems may
be complex to adjust. Your local JBL
installation specialist is the best
person to help with such adjustment. 

For your convenience, we’ve included
several application diagrams to help you
plan your own system installation.
Figures 1 through 3 show how to
configure the JBL P-7520, P-7540 or 
P-2510 for stereo, bridged-mono, and 
tri-mode operation. 
For system expansion ideas, see Figures
4 and 5.  
NOTE: For simplicity, Figures 1 through 3
do not show power, remote, and input
connections.

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Figure 1. This wiring diagram shows a
JBL P-7520/7540 amplifier set to stereo to
drive a pair(s) of full-range speakers.

Figure 2. This wiring diagram shows a
JBL P-7520/7540 amplifier set to bridge
mode (mono) to drive a single subwoofer
or a pair of subwoofers (P-7540).

Figure 3. This wiring diagram shows a
JBL P-75207540 amplifier set for tri-mode
operation. For a desired crossover
frequency, use the chart on page 4 to
select a inductor for the subwoofer, and
corresponding capacitors for left and
right speakers.

Figure 4. In this example system, a JBL 
P-7540 drives two pairs of 5 1⁄4" speakers.
The JBL P-7540’s pre-amp outputs feed a
JBL P-2510 to drive a single 12"
subwoofer.  

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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 outputs feed a JBL P-2510
which drives single 12" subwoofer. 

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No audio

Low/No Remote On Voltage

Check connections; Test turn-on voltage

Speakers are not connected 

Check wiring; use VOM/DVM to

or are blown

measure speaker coil resistance

Distorted audio

Input sensitivity is not set properly

See Setting Input Sensitivity on previous page

Audio lacks “punch”

Speakers are wired with wrong polarity

Check polarity of connections; 
refer to Applications

Audio cycles off and on;

A protection circuit is turning the 

Verify the following: electrical system is

Amber protection LED 

amplifier off and on

between 5 ~ 18 V dc; temperature is not 

(JBL badge on top panel)

over 194°F (90°C); no short circuits; speaker 

is flashing

loads are not less than 2 ohm (4 ohms in 
mono)

Audio cycles off and on; Amber 

GAIN is set too high

Set Input Sensitivity correctly

protection LED (on top panel) 

(see previous page)

is flashing

Fuse blows

Incorrect wiring or short circuit 

Check connections; refer to Applications 

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 experienced
in designing complex mobile audio
systems. 

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.

JBL Consumer Products
250 Crossways Park Drive
Woodbury, NY 11797
www.jbl.com

Part No. SH1124  
Made in DK

Declaration of Conformity

Kongevejen 194B 
DK-3460 Birkerød
DENMARK

declare in own responsibility, that the products described  

 

in this owner’s manual are in compliance with technical

   

standard:

Steen Michaelsen

Birkerød. DENMARK. 7/98

EN 55 013/A12/8. 1994
EN 55 020. 1994

Power Output, 4 ohms:

2 x 75 watts

4 x 75 watts

1 x 250 watts

Power Output, 2 ohms:

2 x 100 watts

4 x 100 watts

1 x 375 watts

Power Output, Bridged 4 ohms:

200 watts

2 x 200 watts

Frequency Response:

20Hz ~ 20kHz +0dB, –1dB

20Hz ~ 20kHz +0dB, –1dB

20Hz ~ 320Hz +0dB, –1dB

Input Sensitivity:

250mV ~ 4V

250mV ~ 4V

250mV ~ 4V

THD + Noise (4 ohms):

0.05 %

0.05 %

0.1 %

Signal-to-Noise:

>100dB

>100dB

>100dB

Maximum Current Draw:

35A

64A

41A

Dimensions (w x h x l):

13-5/8 x 2-1/4 x 8-3/4 in  

21-5/8 x 2-1/4 x  8-3/4 in.

7-5/8 x 2-1/4 x  8-3/4 in. 

347 x 58 x 223mm 

549 x 58 x 223 mm 

194 x 58 x 223 mm 

Steen Michaelsen

Birkerød. DENMARK 9/98

JBL Consumer Products
250 Crossways Park Drive
Woodbury, NY 11797
www.jbl.com

Part No. SH1124  
Made in DK

Declaration of Conformity

Kongevejen 194B 
DK-3460 Birkerød
DENMARK

declare in own responsibility, that the products described  

 

in this owner’s manual are in compliance with technical

   

standard:

Steen Michaelsen

Birkerød. DENMARK. 7/98

EN 55 013/A12/8. 1994
EN 55 020. 1994

Power Output, 4 ohms:

2 x 75 watts

4 x 75 watts

1 x 250 watts

Power Output, 2 ohms:

2 x 100 watts

4 x 100 watts

1 x 375 watts

Power Output, Bridged 4 ohms:

200 watts

2 x 200 watts

Frequency Response:

20Hz ~ 20kHz +0dB, –1dB

20Hz ~ 20kHz +0dB, –1dB

20Hz ~ 320Hz +0dB, –1dB

Input Sensitivity:

250mV ~ 4V

250mV ~ 4V

250mV ~ 4V

THD + Noise (4 ohms):

0.05 %

0.05 %

0.1 %

Signal-to-Noise:

>100dB

>100dB

>100dB

Maximum Current Draw:

35A

64A

41A

Dimensions (w x h x l):

13-5/8 x 2-1/4 x 8-3/4 in  

21-5/8 x 2-1/4 x  8-3/4 in.

7-5/8 x 2-1/4 x  8-3/4 in. 

347 x 58 x 223mm 

549 x 58 x 223 mm 

194 x 58 x 223 mm 

Steen Michaelsen

Birkerød. DENMARK 9/98