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4 | JL Audio - HD600/4 Owner’s Manual
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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 recommended for wire
runs greater than 72 inches (180 cm) in
length. Use of 8 AWG power wire is acceptable
for shorter runs, such as from a power
distribution block to the amplifier or from a
trunk-mounted battery. 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 HD600/4 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 8 AWG power wire,
no longer than 36 inches (90 cm) or 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 amplifier’s control
settings to make sure that they are set
according to the needs of the system.
12) Install power wire fuse (50A for a
single HD600/4) 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 HD600/4 is a very powerful
and compact four-channel, full-range amplifier
utilizing patented Single Cycle Control™
Class D technology for all channels. This
groundbreaking technology delivers reference-
grade 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 pair
for any impedance between 1.5 and 4 ohms per
channel (3-8 ohms bridged) allowing you to get
full use of the HD600/4’s performance capabilities
with a wide range of speaker systems.
The tightly regulated power supply design also
means that the HD600/4’s clean power output
capability remains stable over a wide range of
vehicle voltages, resulting in enhanced fidelity.
The HD600/4 flexible, studio-grade signal
processing allows it to be deployed in a wide
range of system applications:
1) As a four-channel (150W x 4) full-range
amplifier, delivering full-range signals to two
separate stereo speaker systems (front and rear,
for example).
2) As a powerful (150W x 4) four-channel satellite
amplifier in a bi-amplified system, delivering
high-passed signals to front and rear speaker
systems. Preamp outputs permit connection of a
separate amplifier to drive the subwoofer system.
3) As a 600W full-system amplifier in
bi-amplified mode with one channel pair
driving subwoofers in low-pass mode (150W
x 2 or 300W x 1) and the other channel pair
driving main speakers in high-pass mode
(150W x 2).
4) As a very powerful (300W x 2) full-range
amplifier, delivering full-range signals to a
stereo speaker system.
5) As a very powerful (300W x 2) two-channel
satellite amplifier in a bi-amplified system,
delivering high-passed signals to a stereo
speaker system. Preamp outputs permit
connection of a separate amplifier to drive the
subwoofer system.
6) As a powerful (300W x 2) two-channel
subwoofer amplifier in a bi-amplified system,
delivering low-passed signals to a dual
subwoofer system. Preamp outputs permit
connection of a separate amplifier to drive the
satellite speakers.
The HD600/4’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 or with
separate inputs for its front and rear channels.
The HD600/4’s preamp output can send pass-
through signals from the Front Inputs only or it
can sum all four input channels to feed a non-
fading signal to a separate subwoofer amplifier.
As we said, it’s very flexible.
3 …

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