4
| JL Audio - 250/1
v2
Owner’s Manual
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.
The 250/1v2’s “
+12 VDC
” and “
Ground
”
connections are designed to accept 8 AWG -
4 AWG power wire. 8 AWG is a minimum power
wire size for this amplifier.
If you are installing the 250/1v2 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 power wire should
terminate into a distribution block mounted as
close to the amplifiers as possible and should
connect to the 250/1v2 with 8 AWG 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 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
the same gauge wire as the power connection
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
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 when installing amplifier systems
with main fuse ratings above 60A.
Fuse requirements
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 250/1v2 is being run from that power
wire, we recommend a 30A fuse be used. AGU
(big glass fuse), MaxiFuse™ (big plastic-body fuse)
or AFS (mini-blade fuse) types are recommended.
No fuse is required or recommended directly
before the amplifier power connection. If one is
desired, we recommend the use of a 30A AGU,
AFS or MaxiFuse™ type fuse.
ProduCt desCriPtion
The JL Audio 250/1v2 is a monoblock
subwoofer amplifier utilizing proprietary and
patented Class D technology. Its frequency
response is limited to the range below 500
Hz. It is not designed for driving midrange
speakers or tweeters. Every aspect of its
operation has been optimized for low-frequency
amplification. For detailed specifications,
please refer to Appendix C (page 13).
tYPiCal installation sequenCe
The following represents the sequence
for a typical amplifier installation, using an
aftermarket source unit or OEM Interface
processor (like the CleanSweep CL441dsp).
Additional steps and different procedures may
be required in some applications. If you have
any questions, please contact your authorized
JL Audio dealer for assistance.
1)
Disconnect the negative battery post
connection and secure the disconnected cable
to prevent accidental re-connection during
installation.
This step is not optional.
2)
Run power wire (minimum 8 AWG) from the
battery location to the amplifier mounting
location, taking care to route it in such a
way that it will not be damaged and will not
interfere with vehicle operation. Use 4 AWG
or larger power wire and a power distribution
block if additional amplifiers are being
installed with the 250/1v2.
3)
Connect power wire to the positive battery
post. Fuse the wire with an appropriate fuse
block (and connectors) within 18 inches (45
cm) wire length of the positive battery post.
This fuse is essential to protect the vehicle. Do
not install the fuse until the power wire has
been securely connected to the amplifier.
4) Run signal cables and remote turn-on wire
from the source unit to the final amplifier
mounting location.
5)
Run speaker cables from the speaker systems
to the amplifier mounting location.
6)
Find a good, solid metal grounding point
close to the amplifier and connect the
negative power wire to it using appropriate
hardware (use of the JL Audio ECS master
ground lug, XB-MGLU is recommended).
Use the same size power wire as the wire
connected to the “+12VDC” connection
(minimum 8 AWG), no longer than 36 inches
(90 cm) from the amplifier to the ground
connection point. In some vehicles, it may be
necessary to upgrade the battery ground wire.
(See page 5 for important notice).
7)
Securely mount the amplifier using
appropriate hardware.
8)
Connect the positive and negative power
wires to the amplifier. A fuse near the
amplifier is not necessary.
9)
Connect the remote turn-on wire
to the amplifier.
10)
Connect the input cables to the amplifier.
11)
Connect the speaker cables to the amplifier.
12)
Carefully review the amplifier’s control
settings to make sure that they are set
according to the needs of the system.
13)
Install the power wire fuse (30A for a
single 250/1v2) and reconnect the negative
battery post terminal.
14)
Turn on the source unit at a low level
to double-check that the amplifier is
configured correctly. Resist the temptation
to crank it up until you have verified the
control settings.
15
) Make necessary adjustments to the input
sensitivity controls to obtain the right
overall output and the desired balance
in the system. See Appendix A (page 12)
for the recommended input sensitivity
setting method.
16)
Enjoy the fruits of your labor with your
favorite music.
