JL Audio J2250.1, Owner'S Manual, Page: 5 / 20

5
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 person during installation.
Made in China
Speaker Output (Mono) Ground FUSE
30A
Remote + 12VDC
The J2-250.1’s “ +12 VDC ” (positive) and
“ Ground ” (ground) connections are designed
to accept up to 4 AWG power wire. 8 AWG is a
minimum power wire size for this amplifier.
If you are installing the J2-250.1 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 2 AWG
or 1/0 AWG power wire should terminate into
a distribution block mounted as close to the
amplifiers as possible and should connect to the
J2-250.1 with 8 or 4 AWG power wire.
Note: that 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 and ground wires to the
amplifier, strip 1/2-inch (12 mm) of insulation
from each wire and insert the bare wire into the
the appropriate terminal block positions on the
J2-250.1. Use a Phillips screwdriver to secure the
wire via the screw on the top of each terminal.
The “Ground” connection should be made
using 8 AWG 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. The use of a star
washer to lock down the connection is advisable.
Any wires run through metal barriers (such as
firewalls), must be protected with a high quality
insulating 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 (or larger) when installing a J2-250.1.
Fuse requirements
While the J2-250.1 has a 30A ATC fuse on its
power connection panel, this fuse does nothing to
protect the vehicle from a dangerous short circuit
in the power wire. It only protects the amplifier.
It is absolutely vital that the main power lead 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
J2-250.1 is being run from that power wire, we
recommend a 30A fuse be used. AFS, ATC, AGU
or MAXI-type fuses are recommended.
Made in China
Speaker Output (Mono) Ground FUSE
30A
Remote + 12VDC