Bedienungsanleitung JL Audio MHD900 (Seite 7 von 24) (Englisch)

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Ground Connection

The ground connection should be made using

the same gauge wire as the power connection.

It is common for the alternator to be grounded

through its chassis. If the alternator is not

grounded through its chassis and instead employs

a small (10 AWG - 6 AWG) wire to connect to

ground, this wire should also be upgraded to 4

AWG when installing amplifier systems with main

fuse ratings above 60A.

Many vessels employ small (10 AWG - 6 AWG)

wire to ground the battery to the vessel ground

point and to connect the alternator’s positive

connection to the battery. To prevent voltage

drops, these wires should be upgraded to 4

AWG pure copper wire when installing amplifier

systems with main fuse ratings above 60A.

Turn-On Wire

The MHD900/5-24V uses a conventional +12V

or +24V remote turn-on wire, typically controlled

by the source unit’s remote turn-on output. The

amplifier will turn on when +12V or +24V is

present at its “Remote” input and turn off when

+12V or +24V is switched off. If a source unit

does not have a dedicated remote turn-on output,

the amplifier’s turn-on lead can be connected

to +12V via a switch that derives power from an

ignition-switched circuit.

The MDH900/5-24V’s “Remote” turn-on

connector is designed to accept 18 AWG – 12

AWG wire. 18 AWG is more than adequate for

this purpose. To connect the remote turn-on wire

to the amplifier, first back out the set screw on the

bottom of the Power Connector Plug, using the

supplied hex wrench. Strip 1/2 inch (12mm) of

wire and insert the bare wire into the receptacle,

seating it firmly so that no bare wire is exposed.

When using smaller wire, it may be necessary to

strip 1 inch of insulation from the wire and fold

the bare wire in half prior to insertion. While

holding the wire in the terminal, tighten the

set screw firmly using the supplied 2.5 mm hex

wrench, taking care not to strip the head of the

screw and making sure that the wire is firmly

gripped by the set screw.

Amplifier Power Connector Plug

To connect the power wires and the remote

turn-on wire to the amplifier, unplug the power

connector plug from the amplifier chassis (pull

back firmly) and back out the set screws on

the connector plug, using the supplied 4 mm

hex wrench for the +24 VDC” and “Ground”

connections and the supplied 2.5 mm hex wrench

for the “Remote” connection. Strip 3/8 inch (10

mm) of insulation from the end of each wire and

insert the bare wire into the receptacle on power

connector plug, seating it firmly so that no bare

wire is exposed. While holding each wire in place,

tighten each set screw firmly, taking care not to

strip the head of the screw.

Never make power connections with a “live”

wire. Always disconnect the negative battery

post before making any connections or

adjustments to a 24V power connection!

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JL Audio MHD900 Seite 7

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