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4 | JL Audio - M500/3 Owners Manual
PRODUCT DESCRIPTION
The JL Audio M500/3 is a three-channel,
system amplifier utilizing JL Audio NexD™ ultra-
high speed switching technology for its two main
channels and NexD™ high-speed switching for
its subwoofer channel. The NexD™ technologies
deliver outstanding fidelity and efficiency.
The M500/3 can be operated with a wide
variety of source units and system configurations.
TYPICAL INSTALLATION SEQUENCE
The following represents the sequence
for a typical amplifier installation, using
an aftermarket source unit. 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 4 AWG power wire from the battery
location to the amplifier mounting location.
Take care to route the wire in such a way that
it will not be damaged and will not interfere
with vessel operation. Use 2 AWG or larger
power wire and a power distribution block if
additional amplifiers are being installed with
the M500/3.
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 vessel. Do
not install the fuse until the power wire has
been securely connected to the amplifier.
4) Connect negative power wire to the negative
battery post. Use the same size power
wire as the wire connected to the “+12V
connection (minimum 4 AWG).
5) Run signal cables and remote turn-on wire
from the source unit to the amplifier
mounting location.
6) Run speaker cables from the speaker systems
to the amplifier mounting location.
7) Securely mount the amplifier.
8) Connect the positive and negative power
wires to the amplifier. A fuse near the
amplifier is not necessary if the M500/3 is the
only device being run from the fused main
power wire. If the fused main power wire is
shared by the M500/3 and other amplifiers
or devices, fuse each amplifier/device
within 12 inches (30 cm) of wire length,
via a fused distribution block or multiple
individual fuse blocks/on-board fuses.
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 amplifiers control
settings to make sure that they are set
according to the needs of the system.
13) Install the power wire fuse(s) (50A for a
single M500/3) 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 14)
for the recommended input sensitivity
setting method.
16) Enjoy the fruits of your labor with your
favorite music.
4


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