JL Audio Stereo Amplifier 450 4V2 User Manual

OWNER’S MANUAL

four-channel system amplifier

Thank you for purchasing a JL Audio amplifier for

your automotive sound system.

Your amplifier has been designed and manufactured to exacting

standards in order to ensure years of musical enjoyment in your vehicle.

For maximum performance and extended warranty

coverage, we highly recommend that you 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 install the amplifier yourself, please take the time

to read this manual thoroughly so as to familiarize yourself

with its installation requirements and setup procedures.

If you have any questions regarding the instructions in this

manual or any aspect of your amplifier’s operation, please contact your

authorized JL Audio dealer for assistance. If you need further assistance,

please call the JL Audio Technical Support Department

at (954) 443-1100 during business hours.

PROTECT YOUR HEARING!

INSTALLATION APPLICATIONS

Cooling Efficiency Considerations:

We value you as a long-term customer. For

that reason, we urge you to practice restraint in

the operation of this product so as not to damage

your hearing and that of others in your vehicle.

Studies have shown that continuous exposure to

high sound pressure levels can lead to permanent

(irreparable) hearing loss. This and all other

high-power amplifiers are capable of producing

such high sound pressure levels when connected

to a speaker system. Please limit your continuous

exposure to high volume levels.

This amplifier is designed for operation in

vehicles with 12V, negative-ground electrical

systems. Use of this product in vehicles with

positive ground and/or voltages other than 12V

may result in damage to the product and will void

the warranty.

This product is not certified or approved for

use in aircraft.

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amplifier with the outputs of a second amplifier,

including an identical one.

Your JL Audio amplifier employs an

If mounting the amplifier under a seat,

make sure there is at least 1 inch (2.5 cm) of

space above the amplifier’s outer shell to permit

proper cooling.

advanced type of heat management, called

RealSink™. This feature takes advantage of

convection and radiation effects to remove

heat from the amplifier circuitry. For optimum

cooling performance, the vertical heat sinks

located at the back of the amplifier should be

exposed to as large a volume of air as possible.

Enclosing the amplifier in a small, poorly

ventilated chamber can lead to excessive heat

build-up and degraded performance. If an

installation calls for an enclosure around the

amplifier, we recommend that this enclosure

be ventilated with the aid of a fan. In normal

applications, fan-cooling is not necessary, but

you still need to follow some basic guidelines:

Safety Considerations:

Your amplifier needs to be installed in a dry,

well-ventilated environment and in a manner

which does not interfere with your vehicle’s safety

equipment (air bags, seat belt systems, ABS brake

systems, etc.). You should also take the time to

securely mount the amplifier using appropriate

hardware so that it does not come loose in the

event of a collision or a sudden jolt to the vehicle.

While driving, operate your audio system in

a manner that still allows you to hear necessary

noises to operate your vehicle safely (horns,

sirens, etc.).

PLANNING YOUR INSTALLATION

It is important that you take the time to read

this manual and that you plan out your

installation carefully. The following are some

considerations that you must take into account

when planning your installation.

Stupid Mistakes to Avoid:

SERIAL NUMBER

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pointing up: Optimum

In the event that your amplifier requires

service or is ever stolen, you will need to

have a record of the product’s serial number.

Please take the time to enter that number in

the space provided below. The serial number

can be found on the bottom panel of the

amplifier and on the amplifier packaging.

to make sure that you will not be drilling

through a gas tank, brake line, wiring harness or

other vital vehicle system.

tꢀꢀ%PꢀOPUꢀSVOꢀTZTUFNꢀXJSJOHꢀPVUTJEFꢀPSꢀVOEFSOFBUIꢀ

the vehicle. This is an extremely dangerous

practice which can result in severe damage to

your vehicle and person.

tꢀꢀ"NQMJGJFSꢀNPVOUFEꢀIPSJ[POUBMMZꢁꢀ

right side up: Good

tꢀꢀ"NQMJGJFSꢀNPVOUFEꢀIPSJ[POUBMMZꢁꢀCVUꢀVQTJEFꢀ

down: Fair (not recommended if there is

less than 1 inch (2.5 cm) clearance above the

amplifier heat sinks)

tꢀꢀ"NQMJGJFSꢀNPVOUFEꢀWFSUJDBMMZꢀXJUIꢀIFBUꢀTJOLꢀGJOTꢀ tꢀꢀ1SPUFDUꢀBMMꢀTZTUFNꢀXJSFTꢀGSPNꢀTIBSQꢀNFUBMꢀ

Serial Number:

pointing laterally: Fair

tꢀꢀ"NQMJGJFSꢀNPVOUFEꢀWFSUJDBMMZꢀXJUIꢀIFBUꢀTJOLꢀGJOTꢀ

pointing down: Poor (not recommended)

edges and wear by carefully routing them,

tying them down and using grommets and

loom where appropriate.

tꢀꢀ%PꢀOPUꢀNPVOUꢀUIFꢀBNQMJGJFSꢀJOꢀUIFꢀFOHJOFꢀ

compartment, under the vehicle, on the roof

or in any other area that will expose the

amplifier circuitry to the elements.

CH 3&4

HP Filter Slope

Selection / Defeat

(pg. 9)

CH 3&4

Input Sensitivity

Control

CH 1&2

Chassis Ground

Connector

(pg. 6)

Infrasonic Filter

On/Oﬀ Switch

(pg. 11)

CH 1&2 Input

Sensitivity Control

(pg. 8)

CH 1&2

Input Voltage

Range Selector

(pg. 7)

Filter Slope

Selection / Defeat

(pg. 8)

(pg. 9)

CH 1&2

CH 3&4

+12 V Power

Connector

(pg. 6)

Remote Turn-On

Connector

(pg. 7)

Preamp Output

Signal Selector

(pg. 10)

CH 1&2

Speaker Outputs

(pg. 11)

Bass EQ

On/Oﬀ Switch

(pg. 11)

CH 3&4

Speaker Outputs

(pg. 11)

Filter Frequency

Range Selector

(pg. 9)

Input Voltage

Range Selector

(pg. 7)

Filter Frequency

Range Selector

(pg. 9)

+12VDC Ground Remote

Preamp Output Section

CH 1 & 2 Speaker Outputs

CH 1 & 2 Bass Control

CH 1 & 2 Filter Section

CH 1 & 2 Input Section

CH 3 & 4 Filter Section

CH 3 & 4 Input Section

CH 3 & 4 Speaker Outputs

Signal From

Bass EQ

Infrasonic Filter

Freq. Range Filter Mode Slope

Input Voltage Input Sens.

Freq. Range High-Pass Filter

Input Voltage Input Sens.

1 & 2 3 & 4 All

Off On

Off 30Hz

x1 x10 Off 12dB 24dB

Low High

x1 x10 Off 12dB 24dB

Low High

Either

feature

Filter Type

Input Mode

Also sets

low-pass

cutoff for

CH 1 & 2

Bandpass

Filter

Filter Freq. (Hz)

130

HP Filter Freq. (Hz)

130

200

500

sums the

CH 1&2 input

signals to

mono when

activated.

200

450/4v2

Left

ꢃꢂꢉ

Right

ꢃꢂꢉ

Left

ꢁꢂ

Right

ꢁꢂ

Four-Channel System Amplifier

ꢀꢃꢄꢂꢅꢆꢇꢈ

500

LP BP HP

2ch 4ch

ꢀꢃꢄꢂꢅꢆꢇꢈ

(if selected)

1 & 2

and

Remote

Bass Port

CH 1

(Left)

CH 2

(Right)

CH 3

(Left)

CH 4

(Right)

Inputs

Only

Left Output Right Output

Bridged: 300W x 1 (3-8Ω)

Bridged: 150W x 1 (3-8Ω)

3 & 4

Left and Right

Preamp Output Jacks

(pg. 10)

Jack for

Remote Bass

Control Knob

(pg. 11)

Selects CH 1&2

CH 1&2

Selects

Selects CH 3&4

High-Pass Cutoﬀ

Frequency and Low-Pass

Cutoﬀ for CH 1&2 Bandpass

Filter

CH 3&4

Left and Right

Input Jacks

(pg. 7)

2ch / 4ch

Input Mode

(pg. 7)

Left and Right

Input Jacks

(pg. 7)

HP or LP Cutoﬀ

Frequency or HP Cutoﬀ

of Bandpass Filter

(pg. 8)

(pg. 10)

2 | JL Audio - 450/4v2 Owner’s Manual

PRODUCT DESCRIPTION

TYPICAL INSTALLATION SEQUENCE

The following represents the sequence for

a typical amplifier installation, using an

aftermarket source unit or OEM Interface

processor (like the CleanSweep® CL441dsp).

Additional steps and different procedures may

be required in some applications. If you have

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JL Audio dealer for assistance.

ꢀ ꢂꢃꢀꢀ%JTDPOOFDUꢀUIFꢀOFHBUJWFꢀCBUUFSZꢀQPTUꢀ

connection and secure the disconnected cable

to prevent accidental re-connection during

installation. This step is not optional!

2) Run power wire (minimum 4 AWG)

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

vehicle operation. Use 2 AWG or 1/0

AWG power wire if additional amplifiers

are being installed with the 450/4v2.

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 vehicle.

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has been connected to the amplifier.

The JL Audio 450/4v2 is a four-channel system

BNQMJGJFSꢀVUJMJ[JOHꢀQBUFOUFEꢀ"CTPMVUFꢀ4ZNNFUSZ™ꢀ

Class AB technology for all channels. All

channels benefit from JL Audio’s exclusive R.I.P.S.

QPXFSꢀTVQQMZꢀEFTJHOꢀXIJDIꢀPQUJNJ[FTꢀUIFꢀPVUQVUꢀ

of each channel pair for any impedance between

1.5 and 4 ohms per channel.

The staggered power distribution of the 1&2

and 3&4 channel pairs (150W x 2 for CH 1&2 and

75 x 2 for CH 3&4) allows for a wide variety of

application options. The 450/4v2 can be operated

in the following modes:

The 450/4v2’s flexible input and crossover

sections permit operation with a wide variety

of source units and system configurations. The

450/4v2 can operate with a single pair of stereo

inputs or with separate inputs for CH 1&2 and

CH 3&4, if the source unit is equipped with front

and rear outputs. The 450/4v2’s preamp output

can send pass-through signals from the CH 1&2

inputs only or the CH 3&4 inputs only or it can

sum all four input channels to feed a subwoofer

amplifier. This latter mode allows for non-fading

sub-bass with front to rear satellite fading.

As we said, it’s very flexible.

7) Securely mount the amplifier using

appropriate hardware.

8) Connect the positive and negative power

wires to the amplifier. A fuse near the

amplifier is not necessary.

9) Connect the remote turn-on wire

to the amplifier.

10) Connect the RCA input cables

to the amplifier.

11) Connect the speaker wires to the amplifier.

12) Carefully review the amplifier’s control

settings to make sure that they are set

according to the needs of the system.

13) Install power wire fuse (60A for a

single 450/4v2) and reconnect the negative

battery post terminal.

14) 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.

15) Make necessary adjustments to the input

sensitivity controls to obtain the right

overall output and the desired balance

in the system. See Appendix B (page 22)

for the recommended input sensitivity

setting method.

1) As a full-system amplifier in bi-amp mode with

CH 1&2 driving subwoofers in low-pass mode

(150W x 1 or 300W x 1) and CH 3&4 driving

main speakers in high-pass mode (75W x 2).

2) As a high power four-channel satellite

amplifier in a bi-amplified system, delivering

high-passed signals to front and rear speaker

systems. In this mode, we recommend that CH

1&2 drive the front speaker systems and CH

3&4 drive the rear speaker systems. Preamp

outputs permit connection of a separate

amplifier to drive the subwoofer system.

3) As a high power four-channel satellite

amplifier in a tri-amplified system,

delivering band-passed signals through

CH 1&2 to mid-bass speakers and high-

passed signals through CH 3&4 to mid-

range/ tweeter speaker systems. Preamp

outputs permit connection of a separate

amplifier to drive the subwoofer system.

4) As a high power three-channel satellite

amplifier, delivering 150W x 3 at 4Ω in high-

pass mode to left, center and right speaker

systems. This requires bridging the outputs of

CH 3&4 to create an equal power third channel

to complement CH 1&2. Preamp outputs

permit connection of a separate amplifier to

drive the subwoofer system.

4) Run signal cables (RCA cables) and remote

turn-on wire from the source unit to the

amplifier mounting location.

5) Run speaker wire from the speaker systems to

the amplifier mounting location.

6) Find a good, solid metal grounding point

close to the amplifier and connect the

negative power wire to it using appropriate

hardware. Use minimum 4 AWG power wire,

no longer than 36 inches (90 cm) from the

amplifier to the ground connection point. In

some vehicles, it may be necessary to upgrade

the battery ground wire. (See page 6 for

important notice).

16) Enjoy the fruits of your labor with your

favorite music.

4 | JL Audio - 450/4v2 Owner’s Manual

POWER CONNECTIONS

TURN-ON LEAD

Before installing the amplifier,

The ground connection should be made using

the same gauge wire as the power connection

(4 AWG) 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. For

optimal grounding, we recommend the use

of a JL Audio ECS master ground lug

(XB-MGLU). Alternatively, a sheet metal

screw or bolt can be used with a star washer.

Any 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.

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

turn-on lead, typically controlled by the source

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

UVSOꢀPOꢀXIFOꢀꢄꢂꢅ7ꢀJTꢀQSFTFOUꢀBUꢀJUTꢀiRemotewꢀ

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.

5IFꢀꢆꢇꢈꢉꢆWꢅꢊTꢀiRemotewꢀUVSOꢋPOꢀDPOOFDUPSꢀ

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

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 top

of the amplifier, using the supplied hex wrench.

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

bare wire into the receptacle on the front panel

of the amplifier, 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, taking care not to

strip the head of the screw and making sure that

the wire is firmly gripped by the set screw.

5IFꢀiCH 1&2 Input SectionwꢀBMTPꢀDPOUBJOTꢀ

BOꢀiInput ModewꢀTXJUDIꢀUPꢀBMMPXꢀPQFSBUJPOꢀPGꢀ

all four amplifier channels with one or two pairs

of input signals.

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.

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

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

PGꢀTUFSFPꢀJOQVUTꢁꢀTFMFDUꢀUIFꢀi2chwꢀQPTJUJPOꢀPOꢀ

UIFꢀiInput ModewꢀTXJUDIꢀBOEꢀDPOOFDUꢀBꢀTJOHMFꢀ

pair of input cables to the input jacks in the

iCH 1&2 Input Sectionwꢌꢀꢀ*OꢀUIJTꢀNPEFꢁꢀUIFꢀ

amplifier will route the signals connected to

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

+12VDC Ground Remote

450/4v2

Four-Channel System Amplifier

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

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

example) and the source unit is equipped with

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ModewꢀTXJUDIꢀMPDBUFEꢀJOꢀUIFꢀiCH 1&2 Input

Sectionwꢌꢀ*OꢀUIJTꢀNPEFꢁꢀZPVꢀNVTUꢀDPOOFDUꢀTFQBSBUFꢀ

pairs of input cables to each input section.

5IFꢀꢆꢇꢈꢉꢆWꢅꢊTꢀi+12 VDCwꢀBOEꢀiGroundwꢀ

connections are designed to accept 4 AWG power

wire. 4 AWG is the only recommended power

XJSFꢀTJ[FꢀGPSꢀUIJTꢀBNQMJGJFSꢌꢀ

If you are installing the 450/4v2 with other

amplifiers and wish to use a single main power

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

(depending on the overall current demands of

all the amplifiers in the system). This 2 AWG

or 1/0 AWG power wire should terminate into

a distribution block mounted as close to the

amplifiers as possible and should connect to the

450/4v2 with 4 AWG power wire.

IMPORTANT

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 when installing amplifier systems with

main fuse ratings above 60A.

2) Input Voltage Range: A wide range of signal

input voltages can be accommodated by each

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

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

accessible via switches located in each input

section of the amplifier. Be aware that each

JOQVUꢀTFDUJPOꢊTꢀiInput VoltagewꢀTXJUDIꢀXJMMꢀ

have to be configured, regardless of how many

input cables are actually feeding the amplifier.

ꢀ5 I F ꢀi LowwꢀQPTJUJPOꢀPOꢀFBDIꢀiInput Voltagewꢀ

switch selects an input sensitivity range

between 200mV and 2V. This means that the

iInput Sens.wꢀSPUBSZꢀDPOUSPMꢀXJMMꢀPQFSBUFꢀ

within that voltage window. If you are using an

aftermarket source unit, with conventional

preamp-level outputs, this is most likely the

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POꢀFBDIꢀiInput VoltagewꢀTXJUDIꢀTFMFDUTꢀBOꢀ

input sensitivity range between 800mV and 8V.

This is useful for certain high-output preamp

level signals as well as speaker-level output

from source units and small amplifiers.

CH 1&2 / CH 3&4 INPUT SECTIONS

The 450/4v2 has two separate input sections,

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

section contains a pair of RCA-type input jacks,

BOꢀiInput VoltagewꢀTXJUDIꢀBOEꢀBOꢀiInput Sens.wꢀ

rotary control.

Fuse Requirements

Note: Smaller 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.).

It is absolutely vital that the main power

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

fused within 18 inches (45 cm) of the positive

battery post connection. The fuse value at each

power wire should be high enough for all of the

equipment being run from that power wire. If

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

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

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

fuse) types are recommended.

CH 1 & 2 Input Section

CH 3 & 4 Input Section

Input Voltage Input Sens.

To connect the power wires to the amplifier,

first back out the set screw on the top of the

amplifier, using the supplied 2.5 mm hex wrench.

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

end of each wire and insert the bare wire into

the receptacle on the front panel of the amplifier,

seating it firmly so that no bare wire is exposed.

While holding the wire in place, tighten the set

screw firmly, taking care not to strip the head

of the screw.

Low High

Input Mode

2ch 4ch

1 & 2

and

CH 1

(Left)

CH 2

(Right)

CH 3

(Left)

CH 4

(Right)

Inputs

Only

No fuse is required or recommended directly

before the amplifier power connection. If one is

desired, we recommend the use of a 60A AGU

fuse or MaxiFuse™ type.

3 & 4

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

IMPORTANT

CROSSOVER CONTROLS

CH 3&4 Filter Section:

The output of the amplifier will decrease for

a given input voltage when the “Input

Range” switch is placed in the “High”

position. Conversely, the output will be

higher with the switch in the “Low” position.

While this may sound counter-intuitive, it is

correct as described.

Crossovers are groups of individual electronic

filters which allow only certain frequency

ranges to pass through them by attenuating

frequencies outside the selected range. These

filters allow the user to specify what frequency

range will be sent out of each channel section

of the amplifier. This, in turn, allows each

speaker system to only reproduce a range of

frequencies it is well-suited for, resulting in

reduced distortion and improved fidelity.

2) iFilter Mode/Slopewꢀ$POUSPMꢍꢀ5IJTꢀTXJUDIꢀ

allows you to defeat the CH 1&2 filter or select

from two filter slopes.

CH 3 & 4 Filter Section

CH 3

Freq. Range High-Pass Filter

Inpu

x1 x10 Off 12dB 24dB

Low

Mode

Also sets

130

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allowing the full range of frequencies present

at the inputs to feed that pair of channels.

5IJTꢀJTꢀVTFGVMꢀGPSꢀTZTUFNTꢀVUJMJ[JOHꢀPVUCPBSEꢀ

crossovers or requiring full-range reproduction

from that pair of channels.

HP Filter Freq. (Hz)

low-pass

cutoff for

200

500

CH 1 & 2

Bandpass

Filter

4ch

(if selected)

1 & 2

and

3 & 4

(

3) Input Sensitivity Adjustment: Located next

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range has been selected, this control can be

used to match the source unit’s output voltage

to the input stage of each pair of amplifier

channels for maximum clean output. Rotating

the control clockwise will result in higher

sensitivity (louder for a given input voltage).

Rotating the control counter-clockwise will

result in lower sensitivity (quieter for a given

input voltage). To properly set each pair

1) ꢀi High-Pass Filterwꢀ$POUSPMꢍꢀ5IJTꢀTXJUDIꢀBMMPXTꢀ

you to defeat the CH 3&4 filter or select from

two different filter slopes.

CH 1&2 Filter Section:

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to attenuate frequencies above or below the

selected filter frequency at a rate of 12 dB per

octave (Butterworth alignment).

trol

CH 1 & 2 Filter Section

c Filter

Freq. Range Filter Mode Slope

Input V

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allowing the full range of frequencies present

at the inputs to feed that pair of channels.

5IJTꢀJTꢀVTFGVMꢀGPSꢀTZTUFNTꢀVUJMJ[JOHꢀPVUCPBSEꢀ

crossovers or requiring full-range reproduction

from these channels.

0Hz

x1 x10 Off 12dB 24dB

Low

Filter Type

Filter Freq. (Hz)

130

ꢀi 24dBwꢍꢀ$POGJHVSFTꢀUIFꢀGJMUFSꢀGPSꢀ$)ꢀꢂꢎꢅꢀ

to attenuate frequencies above or below the

selected filter frequency at a rate of 24 dB per

PDUBWFꢀ -JOLXJU[ꢋ3JMFZꢀBMJHONFOUꢃꢌꢀ

nput

200

hen

ed.

LP BP HP

500

(Le

of amplifier channels for maximum clean

output, please refer to Appendix B (page 22)

in this manual. After using this procedure,

you can then adjust the relative level of each

channel pair by adjusting the input sensitivity

downward on either or both channel pairs, if

they require attenuation to achieve the desired

TZTUFNꢀCBMBODFꢌꢀ%PꢀOPUꢀJODSFBTFꢀUIFꢀiInput

Sens.wꢀTFUUJOHꢀGPSꢀBOZꢀBNQMJGJFSꢀJOꢀUIFꢀTZTUFNꢀ

beyond the maximum level established during

the procedure outlined in Appendix B (page

ꢅꢅꢃꢌꢀ%PJOHꢀTPꢀXJMMꢀSFTVMUꢀJOꢀBVEJCMFꢀEJTUPSUJPOꢀ

and possible speaker damage. Be aware that

CPUIꢀiInput Sens.wꢀBEKVTUNFOUTꢀXJMMꢀIBWFꢀUPꢀCFꢀ

made, regardless of how many input cables are

feeding the amplifier. These controls will allow

you to set the appropriate relative levels for CH

1&2 relative to CH 3&4 and other amplifier

channels in the system.

1)ꢀꢀiFilter Typewꢀ$POUSPMꢍꢀ-PDBUFEꢀJOꢀUIF

ꢀiCH 1&2 Filter SectionwꢁꢀꢀUIJTꢀTXJUDIꢀBMMPXTꢀ

you to configure the CH 1&2 filter into one

of three filter types:

%FQFOEJOHꢀPOꢀUIFꢀTQFBLFSꢀTZTUFNꢀBOEꢀ

the vehicle, different filter slopes may be

required to produce a smooth transition

between the sound of different speakers in the

system. Experiment to find the slope which

best matches the acoustic requirements of

UIFꢀTZTUFNꢌꢀ5IFꢀTIBSQFSꢀi24dBwꢀTFUUJOHꢀXJMMꢀ

do a better job of protecting small speakers

with limited power handling. The shallower

i12dBwꢀPDUBWFꢀTFUUJOHꢀBMMPXTꢀUIFꢀSFBSꢀTQFBLFSTꢀ

to reproduce more low-frequency content.

ꢀi 12dBwꢍꢀ$POGJHVSFTꢀUIFꢀIJHIꢋQBTTꢀGJMUFSꢀGPSꢀ$)ꢀ

3&4 to attenuate frequencies below the selected

filter frequency at a rate of 12 dB per octave

(Butterworth alignment).

ꢀi LPwꢀ Low-Pass): Configures the CH 1&2

filter to attenuate frequencies above

the selected filter frequency. Useful

for connection of subwoofer(s) to CH

1&2 in a bi-amplified system.

ꢀi 24dBwꢍꢀ$POGJHVSFTꢀUIFꢀIJHIꢋQBTTꢀGJMUFSꢀGPSꢀ$)ꢀ

3&4 to attenuate frequencies below the selected

filter frequency at a rate of 24 dB per octave

-JOLXJU[ꢋ3JMFZꢀBMJHONFOUꢃꢌꢀ

%FQFOEJOHꢀPOꢀUIFꢀTQFBLFSꢀTZTUFNꢀBOEꢀUIFꢀ

vehicle, different filter slopes may be required to

produce a smooth transition between the speakers

in the system. Experiment to find the slope

which best matches the acoustic requirements

PGꢀZPVSꢀTZTUFNꢌꢀ5IFꢀTIBSQFSꢀi24dBwꢀTFUUJOHꢀ

will do a better job of protecting small speakers

with limited power handling. The shallower

i12dBwꢀPDUBWFꢀTFUUJOHꢀBMMPXTꢀUIFꢀSFBSꢀTQFBLFSTꢀUPꢀ

reproduce more low-frequency content.

ꢀi BPwꢀ #BOEQBTTꢃꢍꢀ$POGJHVSFTꢀUIFꢀGJMUFSꢀUPꢀ

attenuate frequencies above the selected filter

frequency and below the frequency selected

in the CH 3&4 High-Pass Filter. This creates

a true bandpass filter well-suited for driving

mid-bass or mid-range speakers in a tri-

amplified system.

3) ꢀi Freq. RangFwꢀ$POUSPMꢍꢀ8IFOꢀUISPXOꢀUPꢀ

the right, this switch multiplies the cutoff

GSFRVFODZꢀTFMFDUFEꢀCZꢀUIFꢀSPUBSZꢀiFilter Freq.

(Hz)wꢀDPOUSPMꢀCZꢀBꢀGBDUPSꢀPGꢀꢂꢈꢌꢀ*OꢀUIFꢀix1wꢀ

position, the range of the rotary control is

ꢇꢈꢀꢋꢀꢇꢈꢈꢀ)[ꢀ BTꢀNBSLFEꢃꢌꢀ*OꢀUIFꢀix10wꢀ

position, the range of the rotary control is

ꢇꢈꢈꢀ)[ꢀꢋꢀꢇꢀL)[ꢀ ꢇꢈꢈꢈꢀ)[ꢃꢌ

ꢀi HPwꢀ High-Pass): Configures the CH 1&2

filter to attenuate frequencies below the

selected filter frequency. Useful for connection

of component speakers to CH 1&2 in a bi-

amplified system.

4)ꢀꢀiFilter Freq. (Hz)wꢀ5IFꢀGJMUFSꢀGSFRVFODZꢀ

markings surrounding this rotary control

are for reference purposes and are generally

accurate to within 1/3 octave or better. If you

would like to select the filter cutoff frequency

with a higher level of precision, consult the

charts in Appendix A (page 22) of this manual.

2) iFreq. Rangewꢀ$POUSPMꢍꢀ8IFOꢀUISPXOꢀUPꢀUIFꢀ

right, this switch multiplies the cutoff frequency

TFMFDUFEꢀCZꢀUIFꢀSPUBSZꢀiFilter Freq. (Hz)wꢀ

DPOUSPMꢀCZꢀBꢀGBDUPSꢀPGꢀꢂꢈꢌꢀ*OꢀUIFꢀix1wꢀQPTJUJPOꢁꢀ

UIFꢀSBOHFꢀPGꢀUIFꢀSPUBSZꢀDPOUSPMꢀJTꢀꢇꢈꢀꢋꢀꢇꢈꢈꢀ)[ꢀ BTꢀ

NBSLFEꢃꢌꢀ*OꢀUIFꢀix10wꢀQPTJUJPOꢁꢀUIFꢀSBOHFꢀPGꢀUIFꢀ

SPUBSZꢀDPOUSPMꢀJTꢀꢇꢈꢈꢀ)[ꢀꢋꢀꢇꢀL)[ꢀ ꢇꢈꢈꢈꢀ)[ꢃꢌ

8 | JL Audio - 450/4v2 Owner’s Manual

SPEAKER OUTPUTS

3)ꢀꢀiFilter Freq. (Hz)wꢀ5IFꢀGJMUFSꢀGSFRVFODZꢀ

markings surrounding this rotary control

are for reference purposes and are generally

accurate to within 1/3 octave or better. If you

would like to select the filter cutoff frequency

with a higher level of precision, consult the

charts in Appendix A (page 22) of this manual.

3) ꢀiALLwꢍꢀ5IJTꢀNPEFꢀEFMJWFSTꢀBꢀTVNꢀPGꢀUIFꢀTJHOBMTꢀ

CFJOHꢀGFEꢀUPꢀUIFꢀiCH 1&2 Input SectionwꢀBOEꢀ

iCH 3&4 Input SectionwꢀPGꢀUIFꢀBNQMJGJFSꢌꢀ

1) iInfrasonic Filterwꢍꢀ5IFꢀJOGSBTPOJDꢀGJMUFSꢀJTꢀBꢀ

24 dB/octave high-pass filter, with a fixed

DVUPGGꢀGSFRVFODZꢀPGꢀꢏꢈꢀ)[ꢌꢀ5IJTꢀGJMUFSꢀJTꢀ

designed to conserve amplifier power and

protect subwoofer systems without audibly

degrading the sub-bass output. With ported

enclosures, the use of the infrasonic filter

is highly recommended to protect the

speaker(s) from excessive excursion below

box tuning. With sealed enclosures, the

use of the filter is less necessary, but can

still help protect the speaker system. The

infrasonic filter can be completely defeated

CZꢀTFMFDUJOHꢀUIFꢀiOffwꢀQPTJUJPOꢀPOꢀUIFꢀ

iInfrasonic FilterwꢀTXJUDIꢌꢀ5IJTꢀCZQBTTFTꢀBMMꢀ

signal from flowing through the circuit.

The 450/4v2 employs JL Audio’s exclusive

Regulated, Intelligent Power Supply (R.I.P.S.)

design. The operation of the R.I.P.S. system is

independent for each pair of channels. This

sophisticated power supply allows the amplifier

to produce its optimum power (150 watts x 2 for

channels 1&2 and 75 watts x 2 for channels 3&4)

over a wide range of speaker impedances.

Unlike conventional amplifiers that require

a specific impedance to produce optimum

power, the R.I.P.S.-equipped 450/4v2 gives

you the freedom to use a variety of speaker

configurations that achieve final nominal

impedances between 1.5 – 4Ω per channel in

stereo (without sacrificing power output or

sound quality). When bridged, each channel

QBJSꢀXJMMꢀPQUJNJ[FꢀPVUQVUꢀCFUXFFOꢀꢏꢀoꢀꢑ͙ꢌꢀ

The operation of the R.I.P.S. circuitry is

entirely automatic and adjusts itself every time

the amplifier is turned on according to the

lowest impedance present at the speaker load.

There are no user controls to configure. The

system operates through multiple stages of

JNQFEBODFꢀPQUJNJ[BUJPOꢁꢀDIPPTJOHꢀUIFꢀTUBHFꢀ

most appropriate to the actual impedance of the

speakers you connect to it.

The Preamp Output signal is not affected by

UIFꢀiLF BoostwꢀPSꢀiInfrasonic FilterwꢀQSPDFTTJOHꢀ

selected for the amplifier or by any crossover

filter selected (if the input signal is full-range,

the preamp output will be full-range). When

the 450/4v2 is being used to drive front and

rear speaker systems, this preamp output mode

will deliver a summed front/rear signal to the

subwoofer amplifier, while permitting fading

of the front and rear speaker systems from the

source unit.

Preamp Output Section

The 450/4v2 incorporates a pass-through

preamp output section, so that additional

amplifiers can be added to the system. This pass-

through pre-amp output can be configured three

EJGGFSFOUꢀXBZTꢀVTJOHꢀUIFꢀTXJUDIꢀMBCFMFEꢀiSignal

FromwꢀJOꢀUIFꢀiPreamp Output Sectionwꢌ

Preamp Output Section

CH 1

Noteꢍꢀ5IFꢀTJHOBMꢀMFWFMꢀPGꢀUIFꢀiPreamp Outputwꢀ

is always low level regardless of the voltage

applied to this amplifier’s inputs and the

setting chosen on this amplifier’s “Input

Range” switch. A JL Audio amplifier receiving

signal from this preamp output should have

its “Input Range” switch set to “Low”.

Signal From

2)ꢀꢀiBass EQwꢍꢀ5IJTꢀTXJUDIꢀBMMPXTꢀUIFꢀVTFSꢀUPꢀ

BDUJWBUFꢀBꢀꢐꢀE#ꢀCPPTUꢀDFOUFSFEꢀBUꢀꢆꢑꢀ)[ꢌ

1 & 2 3 & 4 All

3)ꢀꢀiRemote Bass Portwꢍꢀꢀ"MMPXTꢀZPVꢀUPꢀDPOOFDUꢀBOꢀ

optional remote boost knob (sold separately,

JL Audio Model RBC-1) that can be mounted

in the front of the vehicle. With the RBC-1

connected, the boost is no longer limited to 0

or +6 dB, allowing a range of 0-15 dB of boost

to be selected.

Left Output Right Output

CH 1 & 2 Bass Control

1) ꢀi 1&2wꢍꢀ5IFꢀQSFBNQꢀPVUQVUꢀEFMJWFSTꢀUIFꢀTBNFꢀ

signal that is connected to the 450/4v2’s

CH 1&2 Inputs. This mode is useful for

feeding a subwoofer amplifier when the

450/4v2 is being used to drive front and rear

speaker systems. This preamp output mode

will track the signal level of CH 1&2, allowing

fading of the rear channels without affecting

the subwoofer level.

This section provides two basic bass processing

tools for CH 1&2: a 24 dB/octave infrasonic filter

BUꢀꢏꢈꢀ)[ꢀBOEꢀBꢀꢄꢐꢀE#ꢀCPPTUꢀDJSDVJUꢀDFOUFSFEꢀBUꢀꢆꢑꢀ

)[ꢌꢀꢀ"DUJWBUJPOꢀPGꢀFJUIFSꢀGFBUVSFꢀBVUPNBUJDBMMZꢀ

sums the CH 1&2 input signals to mono. (These

features should only be used when driving

subwoofer(s) from CH 1&2).

ction

CH 1 & 2 Speaker Outputs

IMPORTANT

The “Bass EQ” and “Infrasonic Filter” features

will only operate when the CH 1&2 filter is

activated and in low-pass mode. If you are

using an external active crossover and would

like to use the “Bass EQ” and “Infrasonic

Filter” features, set the “Filter Mode/Slope”

switch on “12dB” and rotate the frequency

selection knob fully clockwise to the “500 Hz”

position. This will activate the bass controls

without significantly affecting the crossover

point selected by the external active crossover.

Left

150W

Right

150W

(1.5-4Ω)

uts

CH 1 & 2 Bass Control

CH 1

utput

Bridged: 300W x 1 (3-8Ω)

Bass EQ

Infrasonic Filter

Freq.

Off On

Off 30Hz

2) ꢀi 3&4wꢍꢀ5IFꢀQSFBNQꢀPVUQVUꢀEFMJWFSTꢀUIFꢀTBNFꢀ

signal that is connected to the 450/4v2’s CH

3&4 Inputs. This mode is useful for feeding a

subwoofer amplifier when the 450/4v2 is being

used to drive front and rear speaker systems.

This preamp output mode will track the signal

level of CH 3&4, allowing fading of the front

channels without affecting the subwoofer level.

Either

feature

sums the

CH 1&2 input

signals to

mono when

activated.

Remote

Bass Port

Filter F

10 | JL Audio - 450/4v2 Owner’s Manual

IMPORTANT

BRIDGING CONSIDERATIONS

STATUS INDICATOR LIGHTS /

PROTECTION CIRCUITRY

There are three status indicator lights on the

top of the amplifier. These are as follows:

SERVICING YOUR JL AUDIO AMPLIFIER

If your amplifier fails or malfunctions, please

SFUVSOꢀJUꢀUPꢀZPVSꢀBVUIPSJ[FEꢀ+-ꢀ"VEJPꢀEFBMFSꢀTPꢀ

that it may be sent in to JL Audio for service.

There are no user serviceable parts or fuses inside

the amplifier. The unique nature of the circuitry

in the JL Audio amplifiers requires specifically

USBJOFEꢀTFSWJDFꢀQFSTPOOFMꢌꢀ%PꢀOPUꢀBUUFNQUꢀ

to service the amplifier yourself or through

VOBVUIPSJ[FEꢀSFQBJSꢀGBDJMJUJFTꢌꢀ5IJTꢀXJMMꢀOPUꢀPOMZꢀ

void the warranty, but may result in the creation

of more problems within the amplifier.

If you connect a load higher than 4Ω nominal

per channel in stereo mode (or 8Ω in bridged

mode), power will drop by half with every

doubling of impedance above 4Ω stereo / 8Ω

mono. If you connect a load lower than 1.5Ω

nominal per channel in stereo mode (or 3Ω in

bridged mode, the amplifier protection

circuitry activates a “safe” mode which reduces

amplifier power to protect the circuitry from

failure (the yellow “Low Ω” LED lights to

indicate that this has happened). See page 13

for details.

Bridging is the practice of combining the

output of two amplifier channels to drive a single

load. When bridged, each channel produces

signals of equal magnitude, but opposite polarity.

The combined output of the two channels

provides twice the output voltage available from a

single channel. The 450/4v2 has been designed for

bridging of its channel pairs without the need for

input inversion adaptors.

1)ꢀꢀiPowerwꢀ Green): lights to indicate that the

amplifier is turned on and operating normally.

2)ꢀꢀiThermalwꢀ Red): lights to indicate that the

amplifier has exceeded its safe operating

temperature, putting the amplifier into a self-

protection mode, which reduces the power

output of the amplifier. The red light will shut

off and the amplifier will return to normal,

full-power operating mode if the heat sink

temperature drops back to a safe level.

ction

CH 3 & 4 Speaker Outputs

Sens.

IMPORTANT

Left

75W

Right

75W

(1.5-4Ω)

Speaker loads below 1.5Ω nominal per channel

in stereo or 3Ω nominal in bridged mode are

not recommended and may cause the amplifier

output to distort excessively.

If you have any questions about the installation or

setup of the amplifier not covered in this manual,

please contact your dealer or technical support.

H 4

ght)

Bridged: 150W x 1 (3-8Ω)

3)ꢀꢀiLow Ωwꢀ Amber): lights to indicate that the

impedance of the speaker load connected to

the amplifier is lower than the optimum load

impedance range for the amplifier. When

this light is on, a protection circuit engages

and reduces the power output of CH 1&2

or CH 3&4, depending on which channel is

experiencing the problem. The amber indicator

will also light when a short-circuit is detected

in the speaker wiring (this can be a short

between the positive and negative speaker

wires or between either speaker wire and the

vehicle chassis). This can be used to diagnose

a short-circuit by only connecting one of the

amplifier sections at a time (CH 1&2 and CH

ꢏꢎꢆꢃꢌꢀ5IFꢀBNCFSꢀ-&%ꢀXJMMꢀMJHIUꢀXIFOꢀZPVꢀ

connect the section that is experiencing the

problem and turn the volume up.

5PꢀCSJEHFꢀBꢀQBJSꢀPGꢀDIBOOFMTꢁꢀVTFꢀUIFꢀiLeft +wꢀ

BOEꢀiRight –wꢀTQFBLFSꢀDPOOFDUPSTꢀPOMZꢀ UIFꢀiLeft

–wꢀBOEꢀiRight +wꢀSFNBJOꢀVOVTFEꢃꢌꢀ5IFOꢀDPOOFDUꢀ

a mono signal to both left and right RCA inputs

for that channel pair. This requires an RCA

i:ꢋ"EBQUPSwꢀꢀMJLFꢀUIFꢀ+-ꢀ"VEJPꢀ&$4ꢀNPEFMꢀ

XB-CLRAICY-1F2M (sold separately).

JL Audio Technical Support:

(954) 443-1100

9:00 AM – 5:30 PM (Eastern Time Zone)

Monday - Friday

When bridged, each channel pair will

deliver optimum power into a 3-8Ω load.

Operating bridged channel pairs into a load

lower than 3Ω is not recommended.

Because a bridged pair of channels requires

that both channels receive input, you need to

connect both left and right RCA inputs to the

bridged channel pair’s inputs. Connection of

only one RCA input will result in reduced power

output, increased distortion and can cause the

BNQMJGJFSꢀUPꢀPWFSIFBUꢌꢀ%PꢀOPUꢀEPꢀUIJTꢒꢀ*OTUFBEꢁꢀVTFꢀ

Bꢀi:ꢋBEBQUPSwꢀUPꢀTQMJUꢀUIFꢀNPOPꢀTJHOBMꢀJOUPꢀCPUIꢀ

left and right RCA inputs.

There is only one condition that will shut

down an undamaged 450/4v2 completely…

If battery voltage drops below 10 volts, the

entire amplifier will shut itself off. The green

i1PXFSwꢀJOEJDBUPSꢀPOꢀUIFꢀUPQꢀPGꢀUIFꢀBNQMJGJFSꢀXJMMꢀ

turn off when this occurs. The amplifier will turn

back on when voltage climbs back above 10 volts.

This may happen in a rapid cycle when bass-

heavy program material causes a weak charging

system to dip below 10 volts momentarily. If this

is happening in your system, have your charging

system inspected to make sure it is working

properly. For information on troubleshooting this

amplifier, refer to Appendix C (page 24).

12 | JL Audio - 450/4v2 Owner’s Manual

SYSTEM CONFIGURATIONS

The 450/4v2 is a very flexible amplifier, well-

suited for a multitude of system configurations.

In this section, the most likely configurations are

explained in detail.

Once you have selected your desired

configuration, you can use the amplifier panel

drawings on the bottom of the following

pages to mark the required switch positions for

easy reference.

B) Fade Subwoofer Level vs. HF Level

Required: a source unit or processor with front

and rear pairs of outputs.

Crossover Setup for Bi-Amplified System

with one 450/4v2:

The separate amplifier will drive the subwoofer

system with low-pass filtering (select a filter

GSFRVFODZꢀPGꢀꢑꢈꢋꢓꢈꢀ)[ꢀUPꢀTUBSUꢃꢌꢀ5IFꢀJOQVUTꢀPGꢀUIFꢀ

subwoofer amplifier may or may not be connected

to the preamp outputs of the 450/4v2, depending

on which connection option you choose.

Input Connections: the first stereo pair of source

unit outputs is connected to the CH 1&2

inputs of the 450/4v2. The second stereo pair

of source unit outputs is connected to the CH

ꢏꢎꢆꢀJOQVUTꢀ TFMFDUꢀi4chwꢀPOꢀUIFꢀiInput Modewꢀ

TXJUDIꢀJOꢀUIFꢀiCH 1&2 Input Sectionwꢃꢌꢀ

Result: in this mode, the user has the ability to

fade or control the level of the LF channels

relative to the HF channels via the source

unit’s fader control without exceeding the

maximum clean output level set by each

BNQMJGJFSꢀTFDUJPOꢊTꢀiInput Sens.wꢀDPOUSPMTꢌ

Once the input sections have been

DPOGJHVSFEꢀBQQSPQSJBUFMZꢁꢀHPꢀUPꢀUIFꢀiCH 1&2

Filter Sectionwꢌꢀꢀ4FMFDUꢀix1wꢀPOꢀUIFꢀiFreq.

RangewꢀTXJUDIꢁꢀiLPwꢀ MPXꢋQBTTꢃꢀPOꢀUIFꢀiFilter

TypewꢀTXJUDIꢀBOEꢀi12dBwꢀPSꢀi24dBwꢀPOꢀUIFꢀ

iFilter Mode/SlopewꢀTXJUDIꢀBOEꢀBOꢀBQQSPQSJBUFꢀ

iFilter Freqꢌwꢀ ꢑꢈꢋꢓꢈꢀ)[ꢀJTꢀBꢀHPPEꢀTUBSUJOHꢀ

point). You may also choose to activate the

iInfrasonic FilterwꢀBOEꢉPSꢀiBass EQwꢀGFBUVSFTꢀ

JOꢀUIFꢀiCH 1&2 Bass ControlwꢀTFDUJPOꢌꢀ1MFBTFꢀ

LFFQꢀJOꢀNJOEꢀUIBUꢀBDUJWBUJPOꢀPGꢀUIFꢀiBass EQwꢀ

NBZꢀSFRVJSFꢀMPXFSJOHꢀUIFꢀ$)ꢀꢂꢎꢅꢀiInput

SensꢌwꢀUPꢀNBJOUBJOꢀDMFBOꢀNBYJNVNꢀPVUQVUꢌ

/FYUꢁꢀUVSOꢀZPVSꢀBUUFOUJPOꢀUPꢀUIFꢀiCH

3&4 Input SectionwꢀBOEꢀTFMFDUꢀix1wꢀPOꢀUIFꢀ

iFreq. RangewꢀTXJUDIꢁꢀiHPwꢀ IJHIꢋQBTTꢃꢀ

POꢀUIFꢀiFilter TypewꢀTXJUDIꢀBOEꢀi12dBwꢀPSꢀ

i24dBwꢀPOꢀUIFꢀiFilter Mode/SlopewꢀTXJUDIꢀ

BOEꢀBOꢀBQQSPQSJBUFꢀiFilter Freq.wꢀ BHBJOꢁꢀ

ꢑꢈꢋꢓꢈꢀ)[ꢀJTꢀBꢀHPPEꢀTUBSUJOHꢀQPJOUꢃꢌ

Input connection options for a bi-amplifier

system with one 450/4v2 and a separate subwoofer

amplifier are as follows:

BI-AMPLIFIED SYSTEMS

Bi-amplified systems are defined as systems

in which separate amplifier channels drive low-

frequency (LF) and high-frequency (HF) speakers

and are separately filtered to send appropriate

frequency ranges to each speaker system.

The most common application of bi-

amplification in mobile audio is to drive a

subwoofer system from one or more amplifiers or

channels and component speakers from separate

amplifiers or channels.

A) No User Adjustability

Required: a basic source unit or processor with

left and right stereo outputs.

Input Connections: a single pair of stereo source

unit outputs is connected to the CH 1&2

JOQVUTꢀPGꢀUIFꢀꢆꢇꢈꢉꢆWꢅꢀ TFMFDUꢀi2chwꢀPOꢀUIFꢀ

iInput ModewꢀTXJUDIꢀJOꢀUIFꢀiCH 1&2 Input

Sectionwꢃꢌꢀ$POOFDUꢀUIFꢀTVCXPPGFSꢀBNQMJGJFSꢀ

inputs to the preamp outputs of the 450/4v2

4FMFDUꢀi1&2wꢀPOꢀUIFꢀi4JHOBMꢀ'SPNwꢀTXJUDIꢀJOꢀ

UIFꢀiPreamp Output Sectionwꢃꢌꢀ

Result: the relative level of the LF and front and

rear HF channels will be fixed by the 450/4v2’s

iInput Sens.wꢀTFUUJOHTꢀBOEꢀXJMMꢀOPUꢀCFꢀVTFSꢀ

adjustable from the front of the vehicle.

C) Subwoofer Level Control Only

Required: a source unit or processor with left,

right and subwoofer outputs.

Input Connections: the main stereo pair of source

unit outputs is connected to the CH 3&4 inputs

of the 450/4v2. The source unit’s dedicated

subwoofer output is connected to the CH

ꢂꢎꢅꢀJOQVUTꢀ TFMFDUꢀi4chwꢀPOꢀUIFꢀiInput Modewꢀ

TXJUDIꢀJOꢀUIFꢀiCH 1&2 Input Sectionwꢃꢌꢀꢀ

Result: in this mode, the user has the ability to

control the absolute level of the LF channels

relative to the HF channels.

The 450/4v2 can be configured to drive a

bi-amplified system by itself or with a separate

subwoofer amplifier.

After proper adjustment of the CH

ꢂꢎꢅꢀBOEꢀ$)ꢀꢏꢎꢆꢀiInput RangewꢀBOEꢀ

Bi-Amplified System with one 450/4v2

In this configuration, CH 1&2 of the 450/4v2

will drive subwoofers (stereo 150W x 2 or bridged

300W x 1) with low-pass filtering. CH 3&4 will

drive component speakers in stereo (75W x 2)

with high-pass filtering.

iInput Sens.wꢀDPOUSPMTꢀVTJOHꢀUIFꢀNFUIPEꢀ

shown in Appendix B (page 22), you can

fine tune filter frequencies and slopes and

attenuate either pair of channels to achieve

proper balance. For precise filter frequency

information refer to Appendix A (page 22).

B) Fade Subwoofer Level vs. HF Level

Required: a source unit or processor with front

and rear pairs of stereo outputs.

IMPORTANT

Input Connections: one stereo pair of source

unit outputs is connected to the CH 1&2

JOQVUTꢀPGꢀUIFꢀꢆꢇꢈꢉꢆWꢅꢀ TFMFDUꢀi2chwꢀPOꢀUIFꢀ

iInput ModewꢀTXJUDIꢀJOꢀUIFꢀiCH 1&2 Input

Sectionwꢃꢌꢀ5IFꢀTFDPOEꢀTUFSFPꢀQBJSꢀPGꢀTPVSDFꢀ

unit outputs is connected to the subwoofer

amplifier inputs. In this mode, the 450/4v2’s

preamp output is not used.

Set the CH 1&2 “Input Sens.” with the source

unit’s subwoofer level control set at 3/4 of full

output. See Appendix B (page 22) for details.

Input connection options for a bi-amplified system

with one 450/4v2 are as follows:

Bi-Amplified System with one

450/4v2 in four-channel mode and

a separate subwoofer amplifier

A) No User Adjustability

Required: a basic source unit or processor with

left and right stereo outputs.

This configuration requires that

the separate subwoofer amplifier has

a built-in low-pass filter. All JL Audio

subwoofer amplifiers have this feature.

In this configuration, CH 1&2 of the 450/4v2

will drive front component speakers (stereo 150W

x 2) with high-pass filtering. CH 3&4 will drive

rear component speakers in stereo (75W x 2) with

high-pass filtering.

Input Connections: a single pair of stereo source

unit outputs connected to the CH 1&2 inputs of

UIFꢀꢆꢇꢈꢉꢆWꢅꢀ TFMFDUꢀi2chwꢀPOꢀUIFꢀiInput Modewꢀ

TXJUDIꢀJOꢀUIFꢀiCH 1&2 Input Sectionwꢃꢌꢀ

Result: the relative level of the LF and HF

DIBOOFMTꢀXJMMꢀCFꢀGJYFEꢀCZꢀUIFꢀꢆꢇꢈꢉꢆWꢅꢊTꢀiInput

Sens.wꢀTFUUJOHTꢀBOEꢀXJMMꢀOPUꢀCFꢀVTFSꢀBEKVTUBCMFꢀ

from the front of the vehicle.

Result: with this option, the user has the ability

to fade the level of the subwoofer amplifier’s

input relative to the HF channels, but

cannot control front-to-rear fading of the

HF channels. The relative level of the front and

rear HF channels will be fixed by the 450/4v2’s

iInput Sens.wꢀTFUUJOHTꢀBOEꢀXJMMꢀOPUꢀCFꢀVTFSꢀ

adjustable from the front of the vehicle.

14 | JL Audio - 450/4v2 Owner’s Manual

C) Fade HF Front to Rear with Non-Fading

Subwoofer Level

Required: a source unit or processor with front

and rear pairs of stereo outputs.

E) Front to Rear HF Fading and

Subwoofer Level Control

Required: a source unit or processor with

front and rear pairs of stereo outputs plus a

dedicated subwoofer output.

After proper adjustment of the 450/4v2’s CH

1&2 and CH 3&4, and the subwoofer amplifier’s

iInput RangewꢀBOEꢀiInput Sens.wꢁꢀZPVꢀDBOꢀGJOFꢀ

tune filter frequencies and slopes and attenuate

either pair of channels to achieve proper balance.

'PSꢀQSPQFSꢀBEKVTUNFOUꢀPGꢀUIFꢀiInput Sens.wꢀ

controls of the 450/4v2 use the method shown in

Appendix B (page 22). For precise filter frequency

information for the 450/4v2 refer to Appendix

A (page 22). Refer to the subwoofer amplifier

owner’s manual for proper adjustments.

Input connection options for bi-amplified 3.1

system with one 450/4v2 and a separate subwoofer

amplifier:

Input Connections: one stereo pair of source

unit outputs-is connected to the CH 1&2

JOQVUTꢀPGꢀUIFꢀꢆꢇꢈꢉꢆWꢅꢀ TFMFDUꢀi4chwꢀPOꢀUIFꢀ

iInput ModewꢀTXJUDIꢀJOꢀUIFꢀiCH 1&2 Input

Sectionwꢃꢌꢀ5IFꢀTFDPOEꢀTUFSFPꢀQBJSꢀPGꢀTPVSDFꢀ

unit outputs is connected to the CH 3&4

inputs of the 450/4v2. Connect the subwoofer

amplifier inputs to the preamp outputs of the

ꢆꢇꢈꢉꢆWꢅꢀ 4FMFDUꢀiALLwꢀPOꢀUIFꢀiSignal Fromwꢀ

TXJUDIꢀJOꢀUIFꢀiPreamp Output Sectionwꢃꢌꢀ

Result: with this option, the user has the ability to

fade the HF signals from front-to-rear without

fading the signal to the subwoofer amplifier.

A) Real Left-Center-Right Channels and

Subwoofer with Multi-Channel Source

Required: a multi-channel processor or source

VOJUꢀ %PMCZꢀ%JHJUBM¥ꢁꢀ%PMCZꢀ1SP-PHJDꢀ**¥ꢁꢀEUT¥ꢁꢀ

etc.) with center channel output.

Input Connections: one stereo pair (front,

typically) of source unit outputs is connected

to the CH 1&2 inputs of the 450/4v2. The

second stereo pair of source unit outputs

(rear, typically) is connected to the CH

ꢏꢎꢆꢀJOQVUTꢀPGꢀUIFꢀꢆꢇꢈꢉꢆWꢅꢀ TFMFDUꢀi4chwꢀPOꢀ

UIFꢀiInput ModewꢀTXJUDIꢀJOꢀUIFꢀiCH 1&2

Input Sectionwꢃꢌꢀ5IFꢀTPVSDFꢀVOJUꢊTꢀEFEJDBUFEꢀ

subwoofer output is connected to the

subwoofer amplifier inputs. In this mode, the

450/4v2’s preamp output is not used.

Result: with this option, the user has the ability

to fade the front and rear HF channels relative

to each other and also has the ability to

control the absolute level of the subwoofer

channel relative to the HF channels.

Input Connections: the left-front and right-front

source unit outputs are connected to the CH

1&2 inputs of the 450/4v2 and the front-center

channel output of the source unit or processor

is connected to the CH 3&4 inputs of the

ꢆꢇꢈꢉꢆWꢅꢀ TFMFDUꢀi4chwꢀPOꢀUIFꢀiInput Modewꢀ

TXJUDIꢀJOꢀUIFꢀiCH 1&2 Input Sectionwꢃꢌꢀ6TFꢀBꢀ

i:ꢋBEBQUPSwꢀMJLFꢀUIFꢀ+-ꢀ"VEJPꢀ&$4ꢀNPEFMꢀ9#ꢋ

CLRAICY-1F2M (sold separately) to feed both

RCA jacks on the amplifier from the single

signal cable. Most multi-channel processors

and source units are also equipped with a

dedicated subwoofer output and subwoofer

level control. Connect this subwoofer output

directly to the subwoofer amplifier’s inputs.

The 450/4v2’s preamp outputs are not used.

Result: True left, center and right channels with

multi-channel material, derived center channel

with stereo material. Rear-surround channels

are unused. User adjustability of left, center

and right channels depends on source unit/

processor. Subwoofer level is user adjustable.

Bi-Amplified 3.1 System with one 450/4v2

in three-channel mode and a separate

subwoofer amplifier

This configuration requires a separate

subwoofer amplifier with a built-in low-

pass filter. All JL Audio subwoofer

D) Subwoofer Level Control Only

amplifiers have this feature.

Required: a source unit or processor with left,

right and dedicated subwoofer outputs.

Input Connections: The main stereo pair of

source unit outputs is connected to the CH

ꢂꢎꢅꢀJOQVUTꢀPGꢀUIFꢀꢆꢇꢈꢉꢆWꢅꢀ TFMFDUꢀi2chwꢀPOꢀ

UIFꢀiInput ModewꢀTXJUDIꢀJOꢀUIFꢀiCH 1&2

Input Sectionwꢃꢌꢀ5IFꢀTPVSDFꢀVOJUꢊTꢀEFEJDBUFEꢀ

subwoofer output is connected to the

The separate amplifier will drive the subwoofer

system with low-pass filtering (select a filter

GSFRVFODZꢀPGꢀꢑꢈꢋꢓꢈꢀ)[ꢀUPꢀTUBSUꢃꢌꢀ5IFꢀJOQVUTꢀPGꢀ

the subwoofer amplifier will be connected to the

preamp outputs of the 450/4v2 or to the source

unit or multi-channel processor directly.

In this configuration, CH 1&2 of the 450/4v2

will drive front-left and front-right component

speakers (stereo 150W x 2) with high-pass

filtering. CH 3&4 will be bridged mono to drive a

center-front component speaker system (150W x

1) with high-pass filtering. All three channels will

have equal power at 3 – 4Ω.

IMPORTANT

Set the CH 1&2 “Input Sens.” with the source

unit’s subwoofer level control set at 3/4 of full

output. See Appendix B (page 20) for details.

subwoofer amplifier inputs. In this mode, the

450/4v2’s preamp output is not used.

Crossover Setup for Bi-Amplified System with one

450/4v2 and a separate subwoofer amplifier:

Result: with this option, the user has the ability

to control the absolute level of the subwoofer

channel relative to the HF channels, but

cannot fade the front and rear HF channels

relative to each other.

Once the input and preamp output sections

have been configured appropriately, go to the

iCH 1&2 Filter Sectionwꢌꢀ4FMFDUꢀix1wꢀPOꢀUIFꢀ

iFreq. RangewꢀTXJUDIꢁꢀiHPwꢀ IJHIꢋQBTTꢃꢀPOꢀUIFꢀ

i'JMUFSꢀ5ZQFwꢀTXJUDIꢀBOEꢀi12dBwꢀPSꢀi24dBwꢀPOꢀUIFꢀ

i'JMUFSꢀMode/SlopFwꢀTXJUDIꢀBOEꢀBOꢀBQQSPQSJBUFꢀ

iFilter Freq.wꢀ ꢑꢈꢋꢓꢈꢀ)[ꢀJTꢀBꢀHPPEꢀTUBSUJOHꢀQPJOUꢃꢌꢀꢀ

5IFꢀiInfrasonic FilterwꢀBOEꢀiBass EQwꢀGFBUVSFTꢀ

cannot be used in this mode.

IMPORTANT

Set the subwoofer amplifier’s “Input Sens.”

with the source unit’s subwoofer level

control set at 3/4 of full output. Refer to the

subwoofer amplifier owner’s manual for

proper adjustment.

IMPORTANT

Set the CH 1&2 “Input Sens.” with the source

unit’s subwoofer level control set at 3/4 of full

output. See Appendix B (page 20) for details.

/FYUꢁꢀUVSOꢀZPVSꢀBUUFOUJPOꢀUPꢀUIFꢀiCH 3&4

Input SectionwꢀBOEꢀTFMFDUꢀix1wꢀPOꢀUIFꢀiFreq.

RangewꢀTXJUDIꢁꢀiHPwꢀ IJHIꢋQBTTꢃꢀPOꢀUIFꢀiFilter

TypewꢀTXJUDIꢀBOEꢀi12dBwꢀPSꢀi24dBwꢀPOꢀUIFꢀiFilter

Mode/SlopewꢀTXJUDIꢀBOEꢀBOꢀBQQSPQSJBUFꢀiFilter

Freq.wꢀ BHBJOꢁꢀꢑꢈꢋꢓꢈꢀ)[ꢀJTꢀBꢀHPPEꢀTUBSUJOHꢀQPJOUꢃꢌ

16 | JL Audio - 450/4v2 Owner’s Manual

IMPORTANT

The “Summed Center Channel” methods

outlined below do not create a true center

channel, they simply sum left and right signals

to the center speaker system. This is not as

desirable as a true center channel from a multi-

channel source, but it can be used to create a

convincing sound stage in some applications.

D) Fade Between “Summed Center Channel”

Level and Left/Right Level with Separate

Subwoofer Level Control

Required: a source unit or processor with

front and rear pairs of stereo outputs plus a

dedicated subwoofer output.

Crossover setup for bi-amplified 3.1 system with

one 450/4v2 and a separate subwoofer amplifier:

Bi-Amplified 5.1 System with

Multi-Channel Source, one 450/4v2 in

three-channel mode, a JL Audio 300/2

amplifier driving rear surround speakers

and a separate subwoofer amplifier

(JL Audio 500/1v2 or 1000/1v2 recommended)

This configuration is identical to the 3.1 system

configuration with Input Option A, except for

the addition of a JL Audio 300/2v2 two-channel

amplifier to drive rear surround speakers,

effectively creating a true 5.1 multi-channel

system with left-front, center-front, right-front,

left-rear and left-right channels.

The 300/2v2 in two-channel stereo mode is

perfectly matched to the 450/4v2 in three channel

Left, Center, Right mode. The system will deliver

150 W x 5 to power the component speaker

systems plus the output of an additional amplifier

to the subwoofer system.

Once the input and preamp output sections have

CFFOꢀDPOGJHVSFEꢀBQQSPQSJBUFMZꢁꢀHPꢀUPꢀUIFꢀiCH

1&2 Filter Sectionwꢌꢀ4FMFDUꢀix1wꢀPOꢀUIFꢀiFreq.

RangewꢀTXJUDIꢁꢀiHPwꢀ IJHIꢋQBTTꢃꢀPOꢀUIFꢀiFilter

TypewꢀTXJUDIꢀBOEꢀi12dBwꢀPSꢀi24dBwꢀPOꢀUIFꢀ

iFilter Mode/SlopewꢀTXJUDIꢀBOEꢀBOꢀBQQSPQSJBUFꢀ

iFilter Freq.wꢀ ꢑꢈꢋꢓꢈꢀ)[ꢀJTꢀBꢀHPPEꢀTUBSUJOHꢀQPJOUꢃꢌꢀꢀ

5IFꢀiInfrasonic FilterwꢀBOEꢀiBass EQwꢀGFBUVSFTꢀ

cannot be used in this mode.

/FYUꢁꢀUVSOꢀZPVSꢀBUUFOUJPOꢀUPꢀUIFꢀiCH 3&4

Input SectionwꢀBOEꢀTFMFDUꢀix1wꢀPOꢀUIFꢀiFreq.

RangewꢀTXJUDIꢁꢀiHPwꢀ IJHIꢋQBTTꢃꢀPOꢀUIFꢀiFilter

TypewꢀTXJUDIꢀBOEꢀi12dBwꢀPSꢀi24dBwꢀPOꢀUIFꢀiFilter

Mode/SlopewꢀTXJUDIꢀBOEꢀBOꢀBQQSPQSJBUFꢀiFilter

Freq.wꢀ BHBJOꢁꢀꢑꢈꢋꢓꢈꢀ)[ꢀJTꢀBꢀHPPEꢀTUBSUJOHꢀQPJOUꢃꢌ

After proper adjustment of the 450/4v2’s

CH 1&2 and CH 3&4, and the subwoofer

BNQMJGJFSꢊTꢀiInput RangewꢀBOEꢀiInput Sens.wꢁꢀ

you can fine tune filter frequencies and slopes

and attenuate the center channel or the left

BOEꢀSJHIUꢀDIBOOFMꢀQBJSꢀXJUIꢀUIFꢀiInput Sens.wꢀ

controls to achieve proper balance. For proper

BEKVTUNFOUꢀPGꢀUIFꢀiInput Sens.wꢀDPOUSPMTꢀPGꢀUIFꢀ

450/4v2 use the method shown in Appendix

B (page 22). For precise filter frequency

Input Connections: one pair of stereo source

unit outputs is connected to the CH 1&2

JOQVUTꢀPGꢀUIFꢀꢆꢇꢈꢉꢆWꢅꢀ TFMFDUꢀi4chwꢀPOꢀUIFꢀ

iInput ModewꢀTXJUDIꢀJOꢀUIFꢀiCH 1&2 Input

Sectionwꢃꢌꢀ"ꢀTFDPOEꢀQBJSꢀPGꢀTPVSDFꢀVOJUꢀ

outputs is connected to the CH 3&4 inputs.

The source unit’s dedicated subwoofer output

is connected to the subwoofer amplifier’s

inputs. In this mode, the 450/4v2’s preamp

output is not used.

Result: with this option, the user has the ability to

GBEFꢀCFUXFFOꢀUIFꢀi4VNNFEꢀ$FOUFSꢀ$IBOOFMwꢀ

level and the Left and Right channel levels via

the source unit’s fader control and also has

the ability to control the absolute level of the

subwoofer channel relative to the three HF

channels with the source unit’s subwoofer

level control.

B) “Summed Center Channel”,

No User Adjustability

Required: a basic source unit or processor with

left and right stereo outputs.

Input Connections: a single pair of stereo source

unit outputs, connected to the CH 1&2

JOQVUTꢀPGꢀUIFꢀꢆꢇꢈꢉꢆWꢅꢀ TFMFDUꢀi2chwꢀPOꢀUIFꢀ

iInput ModewꢀTXJUDIꢀJOꢀUIFꢀiCH 1&2 Input

Sectionwꢃꢌꢀ$POOFDUꢀUIFꢀTVCXPPGFSꢀBNQMJGJFSꢀ

inputs to the preamp outputs of the 450/4v2

4FMFDUꢀi1&2wꢀPOꢀUIFꢀiSignal FromwꢀTXJUDIꢀJOꢀ

UIFꢀiPreamp Output Sectionwꢃꢌꢀ

Result: the relative level of all channels will be

GJYFEꢀCZꢀUIFꢀꢆꢇꢈꢉꢆWꢅꢊTꢀiInput Sens.wꢀTFUUJOHTꢀ

and will not be user adjustable from the front

of the vehicle.

To add this capability, connect the 300/2v2’s

inputs to the rear (surround) outputs of a multi-

channel processor or source unit and set the

ꢏꢈꢈꢉꢅWꢅꢊTꢀiAmp FilterwꢀJOꢀiHPwꢀNPEFꢀXJUIꢀBꢀ

i12dBwꢀPSꢀi24dBwꢀGJMUFSꢀTMPQFꢌꢀ

C) Fade Between “Summed Center Channel”

Level and Left/Right Level with Non-Fading

Subwoofer Level

Required: a source unit or processor with front

and rear pairs of stereo outputs.

Input Connections: one pair of stereo source

unit outputs is connected to the CH 1&2

JOQVUTꢀPGꢀUIFꢀꢆꢇꢈꢉꢆWꢅꢀ TFMFDUꢀi4chwꢀPOꢀUIFꢀ

iInput ModewꢀTXJUDIꢀJOꢀUIFꢀiCH 1&2 Input

Sectionwꢃꢌꢀ"ꢀTFDPOEꢀQBJSꢀPGꢀTPVSDFꢀVOJUꢀ

outputs is connected to the CH 3&4 inputs.

Connect the subwoofer amplifier inputs to the

QSFBNQꢀPVUQVUTꢀPGꢀUIFꢀꢆꢇꢈꢉꢆWꢅꢀ 4FMFDUꢀiALLwꢀ

POꢀUIFꢀiSignal FromwꢀTXJUDIꢀJOꢀUIFꢀiPreamp

Output Sectionwꢃꢌ

IMPORTANT

Set the subwoofer amplifier’s “Input Sens.”

with the source unit’s subwoofer level

control set at 3/4 of full output. Refer to the

subwoofer amplifier owner’s manual for

proper adjustment.

information for the 450/4v2 refer to Appendix

A (page 22). Refer to the subwoofer amplifier

owner’s manual for proper adjustments.

Result: with this option, the user has the ability

UPꢀBEKVTUꢀUIFꢀSFMBUJWFꢀMFWFMꢀPGꢀUIFꢀi4VNNFEꢀ

$FOUFSꢀ$IBOOFMwꢀJOQVUꢀSFMBUJWFꢀUPꢀUIFꢀ-FGUꢀBOEꢀ

Right channel pair via the source unit’s fader

control. Subwoofer is non-fading.

18 | JL Audio - 450/4v2 Owner’s Manual

TRI-AMPLIFIED SYSTEMS

Tri-amplified systems are defined as systems

in which separate amplifier channels drive

low-frequency (LF), mid-frequency (MF) and

high-frequency (HF) speakers and are separately

filtered to send appropriate frequency ranges to

each speaker system.

Input connection options for the Tri-Amplified

Stereo mode are as follows:

C) Subwoofer Level Control Only

Required: a source unit or processor

with left, right and dedicated

Crossover setup for tri-amplified 3.1 system with

one 450/4v2 and a separate subwoofer amplifier:

A) No User Adjustability

Required: a basic source unit or processor with

left and right stereo outputs.

subwoofer outputs is required.

Once the input and preamp output sections have

CFFOꢀDPOGJHVSFEꢀBQQSPQSJBUFMZꢁꢀHPꢀUPꢀUIFꢀiCH 1&2

Filter SectionwꢀPGꢀUIFꢀꢆꢇꢈꢉꢆWꢅꢌꢀꢀ5IFTFꢀTFUUJOHTꢀ

will determine the high-pass cutoff and slope of

the bandpass filtering applied to the MF (mid-

GSFRVFODZꢃꢀDIBOOFMTꢌꢀ4FMFDUꢀix1wꢀPOꢀUIFꢀiFreq.

RangewꢀTXJUDIꢁꢀiBPwꢀ CBOEQBTTꢃꢀPOꢀUIFꢀiFilter

TypewꢀTXJUDIꢀBOEꢀi12dBwꢀPSꢀi24dBwꢀPOꢀUIFꢀ

iFilter Mode/SlopewꢀTXJUDIꢀBOEꢀBOꢀBQQSPQSJBUFꢀ

iFilter Freq.wꢀ ꢑꢈꢋꢓꢈꢀ)[ꢀJTꢀBꢀHPPEꢀTUBSUJOHꢀQPJOUꢃꢌꢀꢀ

5IFꢀiInfrasonic FilterwꢀBOEꢀiBass EQwꢀGFBUVSFTꢀ

cannot be used in this mode.

/FYUꢁꢀUVSOꢀZPVSꢀBUUFOUJPOꢀUPꢀUIFꢀiCH 3&4

Input Sectionwꢌꢀꢀ5IFTFꢀTFUUJOHTꢀXJMMꢀEFUFSNJOFꢀ

the high-pass cutoff and slope of the high pass

filtering applied to the HF (high-frequency)

channels as well as the low-pass cutoff frequency

and slope for the MF channels’ bandpass filter.

4FMFDUꢀix1wꢀPOꢀUIFꢀiFreq. RangewꢀTXJUDIꢀJGꢀZPVSꢀ

desired MF to HF crossover frequency is below

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if your desired MF to HF crossover frequency

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iFilter TypewꢀTXJUDIꢀBOEꢀi12dBwꢀPSꢀi24dBwꢀ

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BQQSPQSJBUFꢀiFilter Freq.w

After proper adjustment of the 450/4v2’s CH

1&2 and CH 3&4, and the subwoofer amplifier’s

iInput RangewꢀBOEꢀiInput Sens.wꢁꢀZPVꢀDBOꢀGJOFꢀ

tune filter frequencies and slopes and attenuate

the LF, MF and HF channel pair or with the

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controls of the 450/4v2 use the method shown in

Appendix B (page 22). For precise filter frequency

information for the 450/4v2 refer to Appendix

A (page 22). Refer to the subwoofer amplifier

owner’s manual for proper adjustments.

Input Connections: one stereo pair of source

unit outputs is connected to the CH 1&2

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iInput ModewꢀTXJUDIꢀJOꢀUIFꢀiCH 1&2 Input

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subwoofer output is connected to the

subwoofer amplifier inputs. In this mode, the

450/4v2’s preamp output is not used.

Result: the user has the ability to control the

absolute level of the subwoofer channel

relative to the MF and HF channels.

The most common application of tri-

Input Connections: a single pair of stereo

source unit outputs is connected to the CH

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UIFꢀiInput ModewꢀTXJUDIꢀJOꢀUIFꢀiCH 1&2

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are connected to the preamp outputs of the

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TXJUDIꢀJOꢀUIFꢀiPreamp Output Sectionwꢃꢌꢀ

Result: the relative level of all channels will be

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and will not be user adjustable from the front

of the vehicle.

amplification in mobile audio is to drive a

subwoofer system from one or more amplifiers

or channels (LF channels), mid-range speakers

from a separate amplifier or set of channels

(MF channels) and high-frequency speakers

from a separate amplifier or set of channels

(HF channels). One such configuration is to

run subwoofers off the LF channel(s), mid-

bass speakers off the MF channels, and a

passively crossed over mid/high frequency

component speaker systems on the HF channels.

Another approach is to run subwoofers off the

LF channel(s), mid-woofers off the MF channels

and tweeters off the HF channels (all actively

crossed over).

By activating the CH 1&2 bandpass filter

feature, the 450/4v2 can easily be configured

to drive a tri-amplified system in conjunction

with a separate subwoofer amplifier that

includes a low-pass filter. CH 3&4 of the

450/1 will drive the HF speakers (75W x 2),

CH 1&2 will drive the MF speakers (150W

x 2) and the separate subwoofer amp(s)

will drive the LF speakers (subwoofers).

IMPORTANT

Set the subwoofer amplifier’s “Input

Sens.” with the source unit’s subwoofer

level control set at 3/4 of full output.

Refer to the subwoofer amplifier owner’s

manual for proper adjustment.

B) Fade Subwoofer Level vs. MF/HF Level

Required: a source unit or processor with front

and rear pairs of outputs is required.

Input Connections: one stereo pair of source

unit outputs is connected to the CH 1&2

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iInput ModewꢀTXJUDIꢀJOꢀUIFꢀiCH 1&2 Input

SectionwꢃꢀBOEꢀUIFꢀTFDPOEꢀTUFSFPꢀQBJSꢀPGꢀTPVSDFꢀ

unit outputs is connected to the subwoofer

amplifier inputs. In this mode, the 450/4v2’s

preamp output is not used.

Result: the user has the ability to adjust the level

of the subwoofer channel relative to the mid

and high-frequency channels via the source

unit’s fader control, without exceeding the

maximum clean output level set by each

BNQMJGJFSꢀTFDUJPOꢊTꢀiInput Sens.wꢀDPOUSPMTꢌ

20 | JL Audio - 450/4v2 Owner’s Manual

APPENDIX A:

APPENDIX B:

Precise Frequency Selection Chart

Input Sensitivity Level Setting

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channels all the way down.

4) Set the source unit volume to 3/4 of full

volume. If either set of channels is being

driven by a source unit’s dedicated subwoofer

output, also adjust the source unit’s subwoofer

level control to 3/4 of maximum output. This

will allow for reasonable gain overlap with

moderate clipping at full volume.

8)ꢀ*ODSFBTFꢀUIFꢀiInput SensꢌwꢀDPOUSPMꢀVOUJMꢀ

the target voltage is delivered for that set

of channels. If excessive voltage is read

on either set of channels with the control

at minimum (full counterclockwise),

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TXJUDIꢀUPꢀiHighwꢀBOEꢀSFꢋBEKVTUꢌ

9) Once you have adjusted each set of channels to

its maximum unclipped output level, reconnect

UIFꢀTQFBLFS Tꢃꢌꢀ5IFꢀiInput Sens.wꢀDPOUSPMTꢀDBOꢀ

now be adjusted downward if either or both

sets of channels requires attenuation to achieve

the desired system balance.

“FILTER FREQ” CH 1&2 / CH 3&4

APPENDIX A:

Input Sensitivity Level Setting

Detent

Number

Panel

Marking

Actual

Freq.

+-ꢀ"VEJPꢀBNQMJGJFSTꢀVUJMJ[JOHꢀUIFꢀ3FHVMBUFEꢀ

Intelligent Power Supply (R.I.P.S.) allow

delivery of their rated power when connected

to any load impedance from 1.5 - 4Ω per

channel and when connected to a charging

system with any voltage from 11 - 14.5V. This

design is beneficial for many reasons. One of

these reasons is ease of setup. Because each

JL Audio amplifier will always deliver the

same amount of power within its operational

range of impedances and supply voltages, the

maximum, unclipped output is very predictable.

This makes setting the gain structure via the

input sensitivity controls very simple. Following

the directions below will allow the user to adjust

the input sensitivity of the amplifier(s) simply

and easily in just a few minutes using equipment

which is commonly available in installation bays.

Full counter-clockwise: 58

01 . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

02 . . . . . . . . . . . “50” . . . . . . . . . . . .58

03 . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

04 . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

05 . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

06 . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

07 . . . . . . . . . . . . . . . . . . . . . . . . . . . .61

08 . . . . . . . . . . . “60” . . . . . . . . . . . .63

09 . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

10 . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

11 . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

12 . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

13 . . . . . . . . . . . . . . . . . . . . . . . . . . . .74

14 . . . . . . . . . . . “75” . . . . . . . . . . . .77

15 . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

16 . . . . . . . . . . . . . . . . . . . . . . . . . . . .82

17 . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

18 . . . . . . . . . . . . . . . . . . . . . . . . . . . .90

19 . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

20 . . . . . . . . . . . “95” . . . . . . . . . . . .97

21 . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

22 . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

23 . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

24 . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

25 . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

26 . . . . . . . . . . “130” . . . . . . . . . . 135

27 . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

28 . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

29 . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

30 . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

31 . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

32 . . . . . . . . . . “200” . . . . . . . . . . 223

33 . . . . . . . . . . . . . . . . . . . . . . . . . . . 253

34 . . . . . . . . . . . . . . . . . . . . . . . . . . . 289

35 . . . . . . . . . . . . . . . . . . . . . . . . . . . 337

36 . . . . . . . . . . . . . . . . . . . . . . . . . . . 404

37 . . . . . . . . . . . . . . . . . . . . . . . . . . . 474

38 . . . . . . . . . . “500” . . . . . . . . . . 514

Full-clockwise: 542

5) Using the chart below, determine the

target voltage for input sensitivity

adjustment according to the nominal

impedance of the speaker system

connected to each set of outputs.

IMPORTANT

6) Verify that you have disconnected the speakers

before proceeding. Play a track with an

appropriate sine wave (within the frequency

range to be amplified by each set of channels)

at 3/4 source unit volume.

7)ꢀꢀ$POOFDUꢀUIFꢀ"$ꢀWPMUNFUFSꢀUPꢀUIFꢀiCH 1&2

Speaker OutputswꢀPSꢀiCH 3&4 Speaker

OutputswꢀDPOOFDUPSTꢀPGꢀUIFꢀBNQMJGJFSꢌꢀ*GꢀUIFꢀ

channel pair is operating in stereo, it is only

necessary to measure one channel. If bridged,

make sure you test the voltage at the correct

connectors (L+ and R–).

Do not increase any “Input Sens.” setting in

the system beyond the maximum level

established during this procedure. Doing so

will result in audible distortion and possible

speaker damage.

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Sens.wꢀGPSꢀUIFꢀBGGFDUFEꢀDIBOOFMTꢀJGꢀBOZꢀFRVBMJ[FSꢀ

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Sens.wꢀXJUIꢀUIJTꢀQSPDFEVSFꢌꢀ5IJTꢀBQQMJFTꢀUPꢀ

any EQ boost circuit, including the amplifier’s

iBass EQwꢀBOEꢀTPVSDFꢀVOJUꢀUPOFꢀDPOUSPMTꢀPSꢀ&2ꢀ

circuits. EQ cuts will not require re-adjustment.

Necessary Equipment

tꢀ%JHJUBMꢀ"$ꢀ7PMUNFUFS

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0 dB reference level in the frequency range

to be amplified for that set of channels

ꢇꢈꢀ)[ꢀGPSꢀTVCXPPGFSꢀDIBOOFMTꢁꢀꢂꢀL)[ꢀGPSꢀ

a midrange application). The CleanSweep®

$BMJCSBUJPOꢀ%JTDꢀDPOUBJOTꢀUIFꢀBQQSPQSJBUFꢀ

test tones and is available for sale at

http://store.jlaudio.comꢀ%PꢀOPUꢀVTFꢀBUUFOVBUFEꢀ

test tones (-10 dB, -20 dB, etc.).

CHANNELS 1&2

Nom.

CHANNELS 3&4

Impedance

Stereo

24.5 V

21.2 V

17.3 V

15.0 V

Bridged

Stereo

17.3 V

15.0 V

12.2 V

10.6 V

Bridged

34.6 V

The Nine-Step Procedure

8Ω

6Ω

49.0 V

42.4 V

(follow this procedure for each pair of channels)

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iRear Speaker OutputswꢀDPOOFDUPSTꢌ

2) Turn off all processing on the source

unit (bass/treble, loudness, EQ, etc.).

Set fader control to center position

30.0 V

4Ω

34.6 V

24.5 V

3Ω

30.0 V

21.2 V

not recommended

2Ω

and subwoofer level control to 3/4 of

maximum (if used to drive the 450/4v2).

1.5Ω

22 | JL Audio - 450/4v2 Owner’s Manual

APPENDIX C: TROUBLE SHOOTING

“How do I properly set the input sensitivity on my amplifier”

“My amplifier shuts off once in a while, usually at higher volumes”

Check your voltage source and grounding point. The power supply

Please refer to Appendix B (page 22) to set the input sensitivity for

maximum, low-distortion output.

of the 450/4v2 will operate with charging system voltages

down to 10V. Shutdown problems at higher volume levels

can occur when the charging system voltage drops below

10V. These dips can be of very short duration making them

FYUSFNFMZꢀEJGGJDVMUꢀUPꢀEFUFDUꢀXJUIꢀBꢀDPNNPOꢀ%$ꢀWPMUNFUFSꢌꢀ

To ensure proper voltage, inspect all wiring and termination

points. It may also be necessary to upgrade the ground

wire connecting the battery to the vehicle’s chassis and the

power wire connecting the alternator to the battery. Many

vehicles employ small (10 AWG - 6 AWG) wire to ground the

battery to the vehicle’s chassis and to connect the alternator to

the battery. To prevent voltage drops, these wires should be

upgraded to 4 AWG when installing amplifier systems with

main fuse ratings above 60A. Grounding problems are the

leading cause of misdiagnosed amplifier “failures.”

“My amplifier doesn’t turn on”

Check the fuse, not just visually, but with a continuity meter. It is

possible for a fuse to have poor internal connections that

cannot be found by visual inspection. It is best to take the

fuse out of the holder for testing. If no problem is found with

the fuse, inspect the fuse-holder.

Check the integrity of the connections made to each of the

i+12VDCwꢁꢀꢀiGroundwꢁꢀꢀBOEꢀiRemotewꢀUFSNJOBMT. Ensure

that no wire insulation is pinched by the terminal set screw

and that each connection is tight.

Check to make sure there is +12V at the “Remote” connection of the

amplifier. In some cases, the turn-on lead from the source unit

is insufficient to turn on multiple devices and the use of a relay

is required. To test for this problem, jump the i+12VDCw wire

to the iRemotew terminal to see if the amplifier turns on.

“My amplifier turns on, but there is no output”

“I get a distorted / attenuated sound coming out of the speaker(s)”

Check the speaker wires for a possible short, either between the

Check the input signal using an AC voltmeter to measure the

voltage from the source unit while an appropriate test tone is

played through the source unit (disconnect the input cables

from the amplifier prior to this test). The frequency used

should be in the range that is to be amplified by the amplifier

FYBNQMFꢍꢀꢇꢈꢀ)[ꢀGPSꢀBꢀTVCꢀCBTTꢀBQQMJDBUJPOꢀPSꢀꢂꢀL)[ꢀGPSꢀBꢀGVMMꢀ

range / high-pass application). A steady, sufficient voltage

(between 200mV and 8.0-volts) should be present at the

output of the signal cables.

Check the output of the amplifier. Using the procedure explained in

the previous check item (after plugging the input cables back

into the amplifier) test for output at the speaker outputs of

the amplifier. Unless you enjoy test tones at high levels, it is

a good idea to remove the speaker wires from the amplifier

while doing this. Turn the volume up approximately half

way. 5V or more should be measured at the speaker outputs.

This output level can vary greatly between amplifiers but it

should not be in the millivolt range with the source unit at

half volume. If you are reading sufficient voltage, check your

speaker connections as explained below.

positive and negative leads or between either speaker lead

and the vehicle’s chassis ground. If a short is present, you

will experience distorted and/or attenuated output. The

iLow Ωw light will illuminate in this situation. It may be

helpful to disconnect the speaker wires from the amplifier

and use a different set of wires connected to a test speaker.

Check the nominal load impedance to verify that each channel

of the amplifier is driving a load equal to or greater than

1.5 ohms in stereo mode (3 ohms bridged).

Check the input signal and input signal cables to make sure signal

is present at the “Amplifier Inputs” and the cables are not

pinched or loose. It may be helpful to try a different set of

cables and/or a different signal source to be sure.

“My amplifier’s output fluctuates when I tap on it or hit a bump”

Check the connections to the amplifier. Make sure that the

insulation for all wires has been stripped back far enough to

allow a good contact area inside the terminal block.

Check the input connectors to ensure that they all are making good

contact with the input jacks on the amplifier.

Check to ensure that the speaker wires are making a good

connection with the metal inside the terminal block. The

speaker wire connectors are designed to accept up to 8 AWG

wire. Make sure to strip the wire to allow for a sufficient

connection with the metal inside the terminal block.

24 | JL Audio - 450/4v2 Owner’s Manual

APPENDIX D:

450/4v2 Specifications

General Specifications:

Channels 3 & 4:

Recommended Fuse Value: 60A

Amplifier Topology: Class A/B with patented Absolute

Symmetry™ dual N-Channel MOSFET output design

Power Supply: Independent, pulse width modulation-

regulated switching power supply with multistage

impedance optimizing circuitry.

Recommended Fuse Type: AFS, AGU or MaxiFuse™

Input Sections:

No. of Inputs: Two Stereo Pairs (CH 1&2, CH 3&4)

Input Type: Differential-balanced with RCA jack inputs

Input Range: Switchable from 200mV - 2V RMS

to 800mV - 8V RMS

Rated Power (Stereo):

75W RMS x 2 @ 1.5 - 4Ω (11V - 14.5V)

Rated Power (Bridged):

150W RMS x 1 @ 3 - 8Ω (11V - 14.5V)

Channels 1 & 2:

THD at Rated Power: <0.03% @ 4Ω per channel

(20 Hz - 20 kHz)

Amplifier Topology: Class A/B with patented Absolute

Symmetry™ dual N-Channel MOSFET output design

Power Supply: Independent, pulse width modulation-

regulated switching power supply with multistage

impedance optimizing circuitry.

Signal to Noise Ratio: >108.5 dB referred to rated power

(A-weighted, 20 Hz - 20 kHz noise bandwidth)

Frequency Response: 5 Hz - 30 kHz (+0, -1 dB)

Damping Factor: >200 @ 4Ω per ch. / 50 Hz, >100 @ 2Ω

per ch. / 50 Hz

Rated Power (Stereo):

150W RMS x 2 @ 1.5-4Ω (11V - 14.5V)

Slew Rate: 25V/μs

Rated Power (Bridged):

Channel 3&4 Filter: State-variable, 12 dB/octave

Butterworth or 24 dB/octave Linkwitz-Riley High-Pass

with continuously variable cutoff frequency from 50 - 500

Hz, switchable to a range of 500 - 5000 Hz, via x10 switch.

300W RMS x 1 @ 3-8Ω (11V - 14.5V)

THD at Rated Power: <0.03% @ 4Ω per channel

(20 Hz-20 kHz)

Signal to Noise Ratio: >108.5 dB referred to rated power

(A-weighted, 20 Hz-20 kHz noise bandwidth)

Frequency Response: 5 Hz - 30 kHz (+0, -1dB)

Damping Factor: >200 @ 4Ω per ch. / 50 Hz, >100 @ 2Ω

per ch. / 50 Hz

Preamp Output:

2-Channel pass-through type, switch-selectable to pass

signal from CH 1&2 inputs only, from CH 3&4 inputs only

or from all four inputs (summed).

Slew Rate: 25V/μs

CH 1&2 Filter: State-variable, 12 dB/octave Butterworth or

24 dB/octave Linkwitz-Riley Low-Pass or High-Pass with

continuously variable cutoff frequency from 50 - 500 Hz,

switchable to a range of 500 - 5000 Hz, via x10 switch.

Can also be cascaded from Channel 3&4 filter’s cutoff

frequency to operate as a bandpass filter for tri-amp

configurations. Defeatable.

Dimensions (LxWxH):

19.70 in. x 9.25 in. x 2.36 in. (500 mm x 235 mm x 60 mm)

LF Boost: Single-band, fixed-frequency (48 Hz), fixed “Q”

+6 dB boost. Defeatable. Port for optional remote bass

control to provide variable boost control from 0 to +15 dB.

Infrasonic Filter: 24 dB/octave @ 30 Hz, defeatable.

Due to ongoing product development, all specifications are subject to

change without notice.

26 | JL Audio - 450/4v2 Owner’s Manual

INSTALLATION NOTES:

Use this diagram to document your amplifier’s switch and control positions.

+12VDC Ground Remote

Preamp Output Section

CH 1 & 2 Speaker Outputs

CH 1 & 2 Bass Control

CH 1 & 2 Filter Section

CH 1 & 2 Input Section

CH 3 & 4 Filter Section

CH 3 & 4 Input Section

CH 3 & 4 Speaker Outputs

Signal From

Bass EQ

Infrasonic Filter

Freq. Range Filter Mode Slope

Input Voltage Input Sens.

Freq. Range High-Pass Filter

Input Voltage Input Sens.

1 & 2 3 & 4 All

Off On

Off 30Hz

x1 x10 Off 12dB 24dB

Low High

x1 x10 Off 12dB 24dB

Low High

Either

feature

Filter Type

Input Mode

Also sets

low-pass

cutoff for

CH 1 & 2

Bandpass

Filter

Filter Freq. (Hz)

130

HP Filter Freq. (Hz)

130

200

500

sums the

CH 1&2 input

signals to

mono when

activated.

200

450/4v2

Left

150W

Right

150W

Left

75W

Right

75W

Four-Channel System Amplifier

(1.5-4Ω)

500

LP BP HP

2ch 4ch

(1.5-4Ω)

(if selected)

1 & 2

and

Remote

Bass Port

CH 1

(Left)

CH 2

(Right)

CH 3

(Left)

CH 4

(Right)

Inputs

Only

Left Output Right Output

Bridged: 300W x 1 (3-8Ω)

Bridged: 150W x 1 (3-8Ω)

3 & 4

28 | JL Audio - 450/4v2 Owner’s Manual

NOTES

30 | JL Audio - 450/4v2 Owner’s Manual

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