P 4040 (serv.man3) - JBL Car Audio User Guide / Operation Manual. Page 4

4

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 locations of
the four mounting holes.

2. Drill a small pilot hole at each marked

location.

3. Mount the amplifier and securely tighten

the mounting screws.

Refer to Figures 1-6 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 2 mm

2

) to the Gnd

terminal and connect the other end to the
nearest bare-metal chassis component.
Then, connect a red wire (at least 2 mm

2

)

from the vehicles +12-volt battery terminal
to the +Batt terminal on the barrier strip.
Finally connect a blue wire (1,25 mm

2

) 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
instruction regarding the Rem terminal.

1. Connect the speakers, observing proper

polarity, to the speaker output barrier strip
on the amplifier using at least 1,25 mm

2

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, connect

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. 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 to determine
the capacitor and inductor values youll
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 system doesn't
drop below 2 Ohms.

1. If you are using conventional RCA input

connections and a source unit with output
voltage less than 4V, simply plug the RCA
plugs into the RCA jacks on the amplifier

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
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 terminal on the amplifier
may be used as a remote output
connection, and will provide power to turn
on other amplifiers and processors 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 connection will provide the
best noise-free performance posssible.

FREQUENCY

INDUCTOR

CAPACITOR

Crossover 

6dB/oct. LP

6dB/oct. HP

(4 ohm)

(4 ohm)

75Hz

8.0mH

530µF

100Hz

6.4mH

400µF

125Hz

5.0mH

318µF

150Hz

4.2mH

265µF

175Hz

3.6mH

227µF

200Hz

3.2mH

198µF