JL Audio 450/4V2 owner manual Power Connections, Fuse Requirements

POWER CONNECTIONS

TURN-ON LEAD

Before installing the amplifier,

The ground connection should be made using

The 450/4v2 uses a conventional +12V remote

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disconnect the negative (ground) wire

the same gauge wire as the power connection

turn-on lead, typically controlled by the source

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from the vehicle’s battery. This will prevent

(4 AWG) and should be kept as short as possible,

unit’s remote turn-on output. The amplifier will

all four amplifier channels with one or two pairs

accidental damage to the system, the vehicle

while accessing a solid piece of sheet metal in the

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of input signals.

and your body during installation.

vehicle. The surface of the sheet metal should

input and turn off when +12V is switched off. If

be sanded at the contact point to create a clean,

a source unit does not have a dedicated remote

1) Input Mode Switch: If you wish to operate all

metal-to-metal connection between the chassis

turn-on output, the amplifier’s turn-on lead can

four channels of the 450/4v2 with a single pair

+12VDC Ground Remote

and the termination of the ground wire. For

be connected to +12V via a switch that derives

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optimal grounding, we recommend the use

power from an ignition-switched circuit.

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of a JL Audio ECS master ground lug

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pair of input cables to the input jacks in the

450/4v2

(XB-MGLU). Alternatively, a sheet metal

is designed to accept 18 AWG – 8 AWG wire. 12

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screw or bolt can be used with a star washer.

AWG is more than adequate for this purpose.

amplifier will route the signals connected to

Four-Channel System Amplifier

Any wires run through metal barriers (such

To connect the remote turn-on wire to the

the CH 1&2 inputs to CH 3&4 as well.

as firewalls), must be protected with a high

amplifier, first back out the set screw on the top

quality insulating grommet to prevent damage

of the amplifier, using the supplied hex wrench.

If you wish to use separate inputs for CH 1&2

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to the insulation of the wire. Failure to do so

Strip 1/2 inch (12mm) of wire and insert the

and CH 3&4 (to allow front-to-rear fading, for

connections are designed to accept 4 AWG power

may result in a dangerous short circuit.

bare wire into the receptacle on the front panel

example) and the source unit is equipped with

wire. 4 AWG is the only recommended power

of the amplifier, seating it firmly so that no bare

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wire is exposed. When using smaller wire, it may

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I M P O RTA N T

If you are installing the 450/4v2 with other

be necessary to strip 1 inch of insulation from

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Many vehicles employ small (10 AWG - 6 AWG)

amplifiers and wish to use a single main power

the wire and fold the bare wire in half prior to

pairs of input cables to each input section.

wire, use 2 AWG or 1/0 AWG main power wire

wire to ground the battery to the vehicle chassis

insertion. While holding the wire in the terminal,

(depending on the overall current demands of

and to connect the alternator’s positive

tighten the set screw firmly, taking care not to

2) Input Voltage Range: A wide range of signal

all the amplifiers in the system). This 2 AWG

connection to the battery. To prevent voltage

strip the head of the screw and making sure that

input voltages can be accommodated by each

or 1/0 AWG power wire should terminate into

drops, these wires should be upgraded to 4

the wire is firmly gripped by the set screw.

of the 450/4v2’s input sections (200mV – 8V).

a distribution block mounted as close to the

AWG when installing amplifier systems with

This wide range is split up into two sub-ranges,

amplifiers as possible and should connect to the

main fuse ratings above 60A.

CH 1&2 / CH 3&4 INPUT SECTIONS

accessible via switches located in each input

450/4v2 with 4 AWG power wire.

The 450/4v2 has two separate input sections,

section of the amplifier. Be aware that each

Fuse Requirements

one for CH 1&2 and another for CH 3&4. Each

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Note: Smaller AWG numbers mean bigger wire

It is absolutely vital that the main power

section contains a pair of RCA-type input jacks,

have to be configured, regardless of how many

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

wire(s) to the amplifier(s) in the system be

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input cables are actually feeding the amplifier.

2 AWG is smaller, then 4 AWG, then

fused within 18 inches (45 cm) of the positive

rotary control.

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8 AWG, etc.).

battery post connection. The fuse value at each

switch selects an input sensitivity range

power wire should be high enough for all of the

CH 1 & 2 Input Section

CH 3 & 4 Input Section

between 200mV and 2V. This means that the

To connect the power wires to the amplifier,

equipment being run from that power wire. If

Input Voltage

Input Sens.

Input Voltage

Input Sens.

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first back out the set screw on the top of the

only the 450/4v2 is being run from that power

within that voltage window. If you are using an

Low High

Low High

amplifier, using the supplied 2.5 mm hex wrench.

wire, we recommend a 60A fuse be used. AGU

Input Mode

aftermarket source unit, with conventional

Strip 1/2 inch (12 mm) of insulation from the

(big glass fuse) or MaxiFuse™ (big plastic-body

preamp-level outputs, this is most likely the

end of each wire and insert the bare wire into

fuse) types are recommended.

2ch 4ch

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the receptacle on the front panel of the amplifier,

No fuse is required or recommended directly

CH 1

CH 2

1 & 2

1 & 2

CH 3

CH 4

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Inputs

and

(Left)

(Right)

Only

3 & 4

(Left)

(Right)

seating it firmly so that no bare wire is exposed.

before the amplifier power connection. If one is

input sensitivity range between 800mV and 8V.

While holding the wire in place, tighten the set

desired, we recommend the use of a 60A AGU

This is useful for certain high-output preamp

screw firmly, taking care not to strip the head

fuse or MaxiFuse™ type.

level signals as well as speaker-level output

of the screw.

from source units and small amplifiers.

To use speaker-level sources, splice the speaker

output wires of the source unit or small

amplifier onto a pair of RCA plugs for each input pair or use the JL Audio ECS Speaker Wire to RCA adaptor (XB-CLRAIC2-SW).

6 JL Audio - 450/4v2 Owner’s Manual 7