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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 body during installation.
INPUT SECTION
(
L
)
(
R
)
Left
or
Mono
Right
Only
CH. 1&2 CH. 3&4
CH. 3
(
L
)
CH. 4
(
R
)
CH. 1
(
L
)
CH. 2
(
R
)
BridgedBridged
Speaker OutputsSpeaker Outputs
PREOUTS
+12 VDC Ground Remote
The RD400/4’s “+12 VDC” and “Ground
connections are designed to accept 4 AWG copper
power wire. 4 AWG is the minimum copper wire
size for this amplifier.
If you are installing the RD400/4 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 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 RD400/4 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 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 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 with a star washer can be used.
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.
Only use oxygen-free copper (OFC) wire or
tinned copper wire for your amplifiers
Power/Ground connections. Copper-clad
aluminum (CCA) wire is not recommended.
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 RD400/4 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).
5


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