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5
TYPICAL INSTALLATION SEQUENCE
The following represents the sequence for a
typical amplifier installation. 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 positive and negative power wire 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 vessel operation. 8 AWG is the
minimum recommended wire size for this
amplifier. Use a 4 AWG, 2 AWG or 1/0 AWG
main power wire with a power distribution
block when additional amplifiers are being
installed with the MDH900/5-24V and
powered from the same main power wire.
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 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 +24V connection.
5) Run signal cables (RCA cables) and remote
turn-on wire from the source unit or interface
processor to the amplifier mounting location.
6) Run speaker wire from the speaker systems to
the amplifier mounting location.
7) Securely mount the amplifier using
appropriate hardware. (See page 8 for detailed
mounting instructions).
8) Connect the remote turn-on wire and the
positive and negative power wires to the
amplifiers power connector plug. Then insert
the power connector plug into the amplifiers
power connector receptacle, pushing firmly.
9) Connect the RCA input cables
to the amplifier.
10) Connect the speaker wires to the speaker
connector plugs and insert the plugs firmly
into the speaker connector receptacles.
11) Carefully review the amplifier’s control
settings to make sure that they are set
according to the needs of the system.
12) Install power wire fuse (30A for a
single MHD900/5-24V) and reconnect the
negative battery post terminal.
13) 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.
14) Make necessary adjustments to the input
sensitivity controls to obtain the right
overall output and the desired balance
in the system. See Appendix C (pages 18, 19)
for the recommended input sensitivity
setting method.
15) Enjoy the fruits of your labor with your
favorite music.
5


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