Power Connections; Fuse Requirements - JL Audio XD300 Owner's Manual

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.
+12 VDC and Ground
connections are designed to accept 4 AWG
power wire. 8 AWG is the minimum wire size
for this amplifier.
amplifiers and wish to use a single main power
power wire (depending on the overall current
demands of all the amplifiers in the system).
This large power wire should terminate into a
fused distribution block mounted as close to
the amplifiers as possible (within 12 inches /
with 8 or 4 AWG power wire. JL Audio ECS
fused distribution blocks are recommended
Note: Smaller AWG numbers mean bigger
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 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.
!
IMPORTANT
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
If fusing the amplifier near its power
connections (when more than one amp is being
(MAXI™ big plastic-body fuse is recommended).
5