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4 | JL Audio - HD900/5 Owners Manual
5
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 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. 4 AWG is the minimum
recommended wire size for this amplifier.
Use a 2 AWG or 1/0 AWG main power
wire with a fused power distribution
block when additional amplifiers are
being installed with the HD900/5 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 vehicle.
Do not install the fuse until the power wire
has been connected to the amplifier.
4) Run signal cables (RCA cables) and remote
turn-on wire from the source unit or interface
processor to the amplifier mounting location.
5) Run speaker wire from the speaker systems to
the amplifier mounting location.
6) Find a good, solid, bare metal grounding
point close to the amplifier and connect the
negative power wire to it using appropriate
hardware. Use minimum 4 AWG wire up to
60 inches (150 cm) long from the amplifier
to the ground connection point. In some
vehicles, it may be necessary to upgrade the
battery’s ground wire as well. (See page 7 for
important notice).
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
amplifier’s power connector plug. Then insert
the power connector plug into the amplifier’s
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 amplifiers control
settings to make sure that they are set
according to the needs of the system.
12) Install power wire fuse (60A for a
single HD900/5) 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.
PRODUCT DESCRIPTION
The JL Audio HD900/5 is a very powerful
and compact five-channel amplifier utilizing
patented Single Cycle Control™ Class D
technology for all channels. This groundbreaking
technology delivers reference-grade, full-
range sonic performance while requiring
far less current from the vehicle’s electrical
system than a conventional amplifier.
JL Audio’s exclusive R.I.P.S. power supply
design optimizes the output of each channel
section for any impedance between 1.5 and 4
ohms per channel (3-8 ohms bridged on front and
rear sections) allowing you to get full use of the
HD900/5s performance capabilities with a wide
range of speaker systems.
The tightly regulated power supply design also
means that the HD900/5’s clean power output
capability remains stable over a wide range of
vehicle voltages, resulting in enhanced fidelity.
The HD900/5 flexible, studio-grade signal
processing allows it to be deployed in several
different system configurations:
1) As a five-channel amplifier in a bi-amplified
system, driving four satellite speakers (100W x
4), plus a subwoofer system (500W x 1).
2) As a very powerful three-channel amplifier
in a bi-amplified system, driving two satellite
speakers (150W x 2, bridged), plus a subwoofer
system (500W x 1).
3) As a five-channel amplifier in a tri-amplified
system, driving two tweeters (100W x 2), plus
two woofer/mids (100W x 2), plus a subwoofer
system (500W x 1). An external 2-way
crossover is required for this application.
The HD900/5’s flexible input and crossover
sections permit operation with a wide variety
of source units and system configurations.
It can be operated with a single pair of
stereo inputs, with two pairs of stereo inputs
(front and rear) or with separate inputs for
its front, rear and subwoofer channels.
As we said, it’s very flexible.
3


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