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JD250/1 • JD500/1 • JD1000/1 5
The amplifier’s “+12 VDC” and “Ground”
connections are designed to accept up to 4 AWG
copper power wire.
Minimum Power / Ground
Wire Size Requirements:
JD250/1: 8 AWG
JD500/1: 4 AWG
JD1000/1: 4 AWG
If you are installing this amplifier with
other amplifiers, use a main power wire that
is appropriately sized for the overall current
demands of all the amplifiers in the system. This
single copper power wire should terminate into a
fused distribution block, mounted as close to the
amplifiers as possible (within 12 inches / 30 cm of
wire length). The fused output of the distribution
block will connect to the amplifier with
appropriately sized copper power wire (refer to
"Minimum Wire Size Requirements" list above).
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 3 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 copper wire (8 AWG is sufficient
for JD250/1 only) 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!
!
Only use oxygen-free copper (OFC) wire or
tinned copper wire for your amplifier’s
Power/Ground connections. Copper-clad
aluminum (CCA) wire is not recommended.
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
JD250/1: 30A
JD500/1: 50A
JD1000/1: 80A
(MAXI™ big plastic-body fuse is recommended).
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 the JD monoblock amplifier is the only
device connected to this main wire, use the
corresponding fuse value listed above (no other
fuse is required in this situation).
When running multiple devices from one
main power wire, the main fuse value and rating
of the main power wire must be high enough
for all of the equipment being run from it. Use a
fused distribution block to split the main power
wire feed to each device, with appropriate fusing
and power wire for each device.
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