Manual JL Audio 4v2 (page 5 of 20) (English)

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POWER CONNECTIONS

Before installing the amplifier, disconnect the

negative (ground) wire from the vehicle’s battery.

This will prevent accidental damage to the system,

the vehicle and your body during installation.

The XD400/4v2’s “+12 VDC” and “Ground”

connections are designed to accept 4 AWG power

wire. 8 AWG is the minimum required wire size

for this amplifier.

If you are installing the XD400/4v2 with other

amplifiers and wish to use a single main power

wire, use 4 AWG, 2 AWG or 1/0 AWG main

power wire (depending on the overall current

demands of all the amplifiers in the system). This

4 AWG, 2 AWG or 1/0 AWG power wire should

terminate into a fused distribution block mounted

as close to the amplifiers as possible (within 12

inches / 30cm of wire length). The fused output

of the distribution block will connect to the

XD400/4v2 with 8 AWG power wire. JL Audio

ECS fused distribution blocks are recommended

(XD-FDBU–2 and XD-FDBU–4).

Note: Smaller AWG numbers mean bigger wire

and vice-versa (1/0 AWG is the largest, 2 AWG is

smaller, then 4 AWG, then 8 AWG, etc.).

To connect the power wires to the amplifier,

first back out the set screw on the top of the

terminal block, using the supplied 2.5 mm hex

wrench. Strip 1/2 inch (12 mm) of insulation

from the end of each wire and insert the bare

wire into the terminal block, seating it firmly

so that no bare wire is exposed. While holding

the wire in place, tighten the set screw firmly,

taking care not to strip the head of the screw.

The ground connection should be made using

8 or 4 AWG wire and should be kept as short as

possible, while accessing a solid piece of sheet

metal in the vehicle. The surface of the sheet

metal should be sanded at the contact point to

create a clean, metal-to-metal connection between

the chassis and the termination of the ground

wire. For optimal grounding, we recommend

the use of a JL Audio ECS master ground lug

(XB-MGLU). Alternatively, a sheet metal screw or

bolt can be used with a star washer.

Any wires run through metal barriers (such

as firewalls), must be protected with a high

quality rubber grommet to prevent damage to the

insulation of the wire. Failure to do so may result

in a dangerous short circuit.

Many vehicles employ small (10 AWG - 6 AWG)

wire to ground the battery to the vehicle chassis

and to connect the alternator’s positive

connection to the battery. To prevent voltage

drops, these wires should be upgraded to 4

AWG when installing amplifier systems with

main fuse ratings above 60A.

FUSE REQUIREMENTS

It is absolutely vital that the main power

wire(s) to the amplifier(s) in the system be

fused within 18 inches (45 cm) of the positive

battery post connection. The fuse value at each

power wire should be high enough for all of the

equipment being run from that power wire. If

only the XD400/4v2 is being run from that power

wire, use a 40A fuse.

If fusing the amplifier near its power

connections (when more than one amp is being

run from the main power wire), use a 40A fuse

(MAXI™ big plastic-body fuse is recommended).

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JL Audio 4v2 Manual

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