Mounting the Amplifier
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.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.
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 regarding the Rem terminal.)
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.)
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 |
| | |
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)
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.
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
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 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.
