Manual JL Audio 1 (page 4 of 13) (English)

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6 | JL Audio - HD1200/1 Owner’s Manual

Ground Connection

The chassis ground connection must be made

using 4 AWG pure copper wire and should

be kept as short as possible, while accessing a

solid piece of sheet metal in the vehicle. The

surface of the sheet metal should be sanded at

the contact point to create a clean, metal-to-

metal connection between the chassis and the

termination of the ground wire with a brass or

copper power ring. For optimal grounding, we

recommend the use of a JL Audio master ground

lug (XB-MGLU). Alternatively, a sheet metal

screw or bolt can be used with a star washer.

Many vehicles employ small (10 AWG - 6 AWG)

wire to ground the battery to the vehicle chassis

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 (or larger) when

installing amplifier systems with main fuse

ratings above 60A.

Turn-On Wire

The HD1200/1 uses a conventional +12V

remote turn-on wire, typically controlled by

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

amplifier will turn on when +12V is present at

its “Remote” input and turn off when +12V 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 HD1200/1’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 2.5 mm 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 “+12 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 12V power connection!

POWER AND TURNON CONNECTIONS

Before installing the amplifier, disconnect the

negative (ground) wire from the vehicle’s battery.

This will prevent accidental damage to the system,

the vehicle and your body during installation.

Remote

Level

Control

Inputs

+12 VDC Ground Remote

Preouts

+12 VDC Ground Remote

+12V Battery Connection

You will need to connect a power wire to

the vehicle’s positive battery terminal, using

an appropriate power ring or specialized

battery terminal connector, such as the JL

Audio XB-BTU or XD-BTS. This connection

must be tight and corrosion-free to ensure

proper connectivity. This wire MUST be fused

appropriately for safety. Any power wires run

through metal barriers (such as firewalls), must

be protected with a high quality insulating

grommet to prevent damage to the insulation

of the wire. Failure to do so may result in a

dangerous short circuit.

Power Wire Requirements

The HD1200/1’s “+12 VDC” and “Ground”

connections are designed to accept 4 AWG power

wire. 2 AWG or 1/0 AWG pure copper wire is

recommended for any power wire run longer

than 72 inches (180 cm). This larger wire should

be reduced to 4 AWG using a distribution block

within 36 wire inches (90 cm) of the amplifier’s

“+12 VDC” connector. For runs shorter than

72 inches, 4 AWG pure copper power wire is

acceptable.

If you are installing the HD1200/1 with other

amplifiers and wish to use a single main power

wire, use 1/0 AWG pure copper wire as a main

power wire. This 1/0 AWG power wire should

terminate into a fused distribution block mounted

as close to the amplifiers as possible and should

connect to the HD1200/1 with 4 AWG pure

copper power wire.

Please note that lower AWG numbers mean

bigger wire and vice-versa (1/0 AWG is the largest,

2 AWG is smaller, then 4 AWG, then 8 AWG, etc.).

We do not recommend the use of “copper-

clad aluminum wire” or “CCA” wire because

this wire is significantly less conductive than

pure copper wire. Only use pure copper power

wire, such as JL Audio’s Premium Power Wire.

Tinned copper wire (silver color) is acceptable

as the tin-plating is only a very minor

component of the wire.

Fuse Requirements

The installation of a fuse on the main power

wire, within 18 wire inches (45 cm) of the positive

battery terminal is vital to protect the wire and

the vehicle from fire in the event of a collision

or short-circuit. The fuse value at each power

wire should be just high enough for all of the

equipment being run from that power wire. Do

not use a fuse with a value that far exceeds the

total fuse rating of the electronics connected to

the wire.

If only the HD1200/1 is being run

from that power wire, we recommend a

100A fuse be used. MaxiFuse™ (big plastic-

body fuse) types are recommended.

If other amplifiers are also being powered

from a main power wire and all the amplifiers

together exceed 100 amps in total fuse rating,

we recommend the use of an ANL (large-blade)

fuse and holder at the battery plus a fused

distribution block near the amplifiers. Each

amplifier must be fused independently at the

outputs of the fused power distribution block.

We recommend appropriately rated MaxiFuse™

fuses and a JL Audio fused distribution block.

Please consult with your JL Audio

dealer to make sure that the wire, fuse

holder and fuse ratings are appropriate

for your system’s needs. The safety of

your installation depends on appropriate

power connections and fuse protection.

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