Power Connections; Fuse Requirements - JL Audio NexD XD500/3 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
The XD500/3's "+12 VDC" and "Ground"
connections are designed to accept 4 AWG
power wire. 4 AWG is the required wire size for
this amplifier.
If you are installing the XD500/3 with other
amplifiers and wish to use a single main power
wire, use 2 AWG or 1/0 AWG main 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 / 30cm of wire length).
The fused output of the distribution block will
connect to the XD500/3 with 4 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
the terminal, tighten the set screw firmly, taking
care not to strip the head of the screw and making
sure that the wire (not the insulation) is firmly
gripped by the wire clamp in the terminal.
(L)
(R)
Ground Remote
CH. 1&2
INPUT SECTION
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
Remote
ground lug (XB-MGLU). Alternatively, a sheet
Level
Control
metal screw or bolt can be used with a star
washer.
Any wires run through metal barriers (such
SUB CH. Preouts
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
only the XD500/3 is being run from that power
wire, we recommend a 50A fuse be used.
If fusing the amplifier near its power
connections (when more than one amp is being
run from the main power wire), use a 50A fuse.
MAXI™ plastic-body fuses are recommended.
CH. 1 CH. 2
(L) (R)
Bridged Mono Subwoofer
5