P 7520 (serv.man3) - JBL Car Audio User Guide / Operation Manual. Page 3

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• Always wear protective eyewear when

using tools. 

• When routing cables, keep input signal

cables away from power cables and
speaker wires. 

• 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
configurations.

• If the amplifier’s fuse must be replaced,

use only the same rating and type as a
replacement. Do not substitute another
kind.

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)

3. Pre-amp Level Output Connector-

connects to other amps or processors
in the signal chain  (flat on P-7520, flat
or filtered on P-7540)

4. Speaker Output Connector - (2-channel

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-Connections for 

12V +, Gnd. and Rem.

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), 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.

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7540

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