JL Audio MHD600 User manual

OWNE R ’S MANUAL
4-ChannelClass-D Full-Range Marine Amplifier
Thank you for purchasing a JL Audio amplifier for
your marine sound system.
Your amplifier has been designed and manufactured to exacting
standardsin order to ensure years ofmusicalenjoymentin yourvessel.
For maximum performance,we highly recommend thatyou have
your new amplifier installed by an authorized JL Audio dealer. Your
authorized dealer has the training,expertise and installation equipment
to ensure optimum performance from this product.Should you
decide to installthe amplifier yourself,please take the time
to read this manualthoroughly so asto familiarize yourself
with its installation requirements and setup procedures.
Ifyou have any questionsregarding the instructionsin this
manualor any aspectofyour amplifier’soperation,please contactyour
authorized JL Audio dealer for assistance.Ifyou need further assistance,
please callthe JL Audio TechnicalSupportDepartment
at(954)443-1100 during business hours.
NOT FOR USE IN 12 V SYSTEMS!

2 | JL Audio -MHD600/4-24V Owner’s Manual
P R OT E C T Y OUR HE AR ING!
We value you as a long-term customer.For
thatreason,we urge you to practice restraintin
the operation ofthis productso asnotto damage
yourhearing and thatofothers in yourvessel.
Studies have shown thatcontinuousexposure to
high sound pressure levelscan lead to permanent
(irreparable)hearing loss.Thisand allother
high-power amplifiersare capable ofproducing
such high sound pressure levelswhen connected
to a speakersystem.Please limityour continuous
exposure to high volume levels.
While driving,operate your audio system in
a manner thatstillallows you to hear necessary
noises to operate your vesselsafely (horns,
sirens,etc.).
S E R IAL NUMB E R
In the eventthatyour amplifier requires
service oris ever stolen,you willneed to have
a record ofthe product’sserialnumber.Please
take the time to enterthatnumber in the space
provided below.The serialnumber can be found
on the bottom panelofthe amplifier and on the
amplifier packaging.
SerialNumber:
INS T AL L AT ION AP P L IC AT IONS
Thisamplifierisdesigned foroperation in
vesselswith 24 volt,negative-ground electrical
systems.Use ofthisproductin vesselswith
positive ground and/orvoltagesotherthan 24V
may resultin damage to the productand willvoid
the warranty.
This productis notcertified or approved for
use in aircraft.
Do notattemptto “bridge” the outputs ofthis
amplifier with the outputsofa second amplifier,
including an identicalone.
P L ANNING Y OUR INS T AL L AT ION
Itisimportantthatyou take the time to read
this manualand thatyou plan outyour
installation carefully.The following are some
considerationsthatyou musttake into account
when planning yourinstallation.
InputSensitivity
Control
(pg.10)
PowerStatus
Indicator
(pg.16)
FilterMode
Selection
(pg.11)
FilterSlope
Selection
(pg.11)
FilterFrequency
Selector
(pg.11)
InputMode
Selection
(pg.9)
InputVoltage
Selection
(pg.10)
Re a r Pre outs Re mote
L e v e l
Control
F ront Inputs
L
R
L
R
Ground Re mote
Chassis Ground
Connector
(pgs.6-7)
FrontLeft& Right
ChannelInputJacks
(pg.9)
Left& RightPreamp
OutputJacks
(pg.13)
RearLeft& Right
ChannelInputJacks
(pg.9)
Jack for
Remote Level
ControlKnob
(pg.13)
Remote Turn-On
Connector
(pgs.6-7)
+24 V Power
Connector
(pgs.6-7)

3
C o o lin g E f fic ie n c y C o n s id e r a t io n s :
The outer shellofyour JL Audio amplifier
isdesigned to remove heatfrom the amplifier
circuitry.Foroptimum cooling performance,
this outershellshould be exposed to aslarge a
volume ofairas possible.Enclosing the amplifier
in a small,poorly ventilated chamber can
lead to excessive heatbuild-up and degraded
performance.Ifan installation calls foran
enclosure around the amplifier,we recommend
thatthis enclosure be ventilated with the aid
ofa fan.In normalapplications,fan-cooling
isnotnecessary.
Mounting the amplifier upside down is
strongly discouraged.
Ifmounting the amplifier under a seat,
make sure there is atleast1 inch (2.5 cm)of
space above the amplifier’soutershellto permit
propercooling.
S a f e t y C o n s id e r a t io n s :
Youramplifierneedsto be installed in a dry,
well-ventilated environmentand in a manner
which does notinterfere with yourvessel’sfactory
installed electronic devices.You should also take
the time to securely mountthe amplifierso that
itdoesnotcome loose in the eventofa collision/
sudden joltorasa resultofthe repeated vibrations
the vesselisprone to during normaloperation.
S t u p id Mis ta k e s t o Av o id :
• Check before drilling any holes in yourvesselto
make sure thatyou willnotbe drilling through
the hull,a fueltank,fuelline,wiring harnessor
other vitalvesselsystem.
• Do notrun system wiring outside orunderneath
the vessel.Thisis an extremely dangerous
practice which can resultin severe damage to
yourvesseland person.
• Protectallsystem wiresfrom sharp edges
(metal,fiberglass,etc.)by carefully routing
them,tying them down and using grommets
and loom where appropriate.
• Do notmountthe amplifier in the engine
compartmentor in any other area thatwill
expose the amplifier circuitry to the elements.
While this amplifier is specially designed
for marine applications,itis notwaterproof
and itshould notbe mounted where itis
likely to getwet.
InputSensitivity
Control
(pg.10)
FilterMode
Selection
(pg.11)
FilterSlope
Selection
(pg.11)
putMode
Selection
(pg.9)
PreoutsFrom
Selection
(pg.13)
FilterFrequency
Selector
(pg.11)
Remote Level
Control
Selection
(pg.13)
InputVoltage
Selection
(pg.10)
Rear
SpeakerOutputs
(pgs.14-15)
Front
SpeakerOutputs
(pgs.14-15)
or
evel
nob
3)