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4 | JL Audio - MHD600/4 Owners Manual
5
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 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. 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 if additional amplifiers are being
installed. Use a 2 AWG or 1/0 AWG main
power wire with a power distribution
block when additional amplifiers are
being installed with the MHD600/4 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 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 +12V
connection (minimum 8 AWG).
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
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 MHD600/4) 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 MHD600/4 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 vessel’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 MHD600/4’s performance
capabilities with a wide range of speaker systems.
The tightly regulated power supply design also
means that the MHD600/4’s clean power output
capability remains stable over a wide range of
voltages, resulting in enhanced fidelity.
The MHD600/4 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 MHD600/4’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 MHD600/4’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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