JL Audio 450-4V2 User Manual

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OWNER’S MANUAL

four-channelsystem 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) 443-1100during business hours.

PROTECT YOUR HEARING!

We value you as a long-termcustomer. 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 otherhigh-poweramplifiers are capable of producing such high sound pressure levels when connected to a speaker system. Please limit your continuous exposure to high volume levels.

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.).

SERIAL NUMBER

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.

Serial Number:

INSTALLATION APPLICATIONS

This amplifier is designed for operation in vehicles with 12V, negative-groundelectrical 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.

%P OPU BUUFNQU UP iCSJEHFw UIF PVUQVUT PG UIJT amplifier with the outputs of a second amplifier, including an identical one.

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.

Cooling Efficiency Considerations:

Your JL Audio amplifier employs an 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-upand 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-coolingis not necessary, but you still need to follow some basic guidelines:

t "NQMJGJFS NPVOUFE WFSUJDBMMZ XJUI IFBU TJOL GJOT pointing up: Optimum

t "NQMJGJFS NPVOUFE IPSJ[POUBMMZ right side up: Good

t "NQMJGJFS NPVOUFE IPSJ[POUBMMZ CVU VQTJEF down: Fair (not recommended if there is less than 1 inch (2.5 cm) clearance above the amplifier heat sinks)

t "NQMJGJFS NPVOUFE WFSUJDBMMZ XJUI IFBU TJOL GJOT pointing laterally: Fair

t "NQMJGJFS NPVOUFE WFSUJDBMMZ XJUI IFBU TJOL GJOT pointing down: Poor (not recommended)

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.

Safety Considerations:

Your amplifier needs to be installed in a dry, well-ventilatedenvironment 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.

Stupid Mistakes to Avoid:

tCheck before drilling any holes in your vehicle to make sure that you will not be drilling through a gas tank, brake line, wiring harness or other vital vehicle system.

t %P OPU SVO TZTUFN XJSJOH PVUTJEF PS VOEFSOFBUI the vehicle. This is an extremely dangerous practice which can result in severe damage to your vehicle and person.

t 1SPUFDU BMM TZTUFN XJSFT GSPN TIBSQ NFUBM edges and wear by carefully routing them, tying them down and using grommets and loom where appropriate.

t %P OPU NPVOU UIF BNQMJGJFS JO UIF FOHJOF compartment, under the vehicle, on the roof or in any other area that will expose the amplifier circuitry to the elements.

 

Chassis Ground

 

 

 

 

 

 

 

 

 

 

CH 1&2

 

CH 1&2 Input

 

 

CH 3&4

 

 

CH 3&4

 

 

 

 

 

 

Infrasonic Filter

 

 

Filter Slope

 

 

 

HP Filter Slope

 

Input Sensitivity

 

Connector

 

 

 

 

 

On/Off Switch

 

Selection / Defeat

Sensitivity Control

 

Selection / Defeat

Control

+12 V Power

(pg. 6)

 

 

CH 1&2

 

(pg. 11)

 

CH 1&2

(pg. 9)

 

CH 1&2

(pg. 8)

CH 3&4

(pg. 9)

CH 3&4

(pg. 8)

 

Remote Turn-On

Preamp Output

Bass EQ

 

Filter Frequency

 

Input Voltage

 

 

Filter Frequency

 

Input Voltage

 

CH 3&4

Connector

 

Connector

Signal Selector

Speaker Outputs

On/Off Switch

 

Range Selector

 

Range Selector

 

 

Range Selector

 

Range Selector

 

Speaker Outputs

(pg. 6)

 

(pg. 7)

(pg. 10)

(pg. 11)

(pg. 11)

 

 

(pg. 9)

 

 

 

(pg. 7)

 

 

(pg. 9)

 

 

(pg. 7)

 

(pg. 11)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+12VDC Ground Remote

Preamp Output Section

CH 1 & 2 Speaker Outputs

CH 1 & 2 Bass Control

 

 

 

Signal From

 

 

 

 

Bass EQ

Infrasonic Filter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 & 2 | 3 & 4 | All

 

 

 

 

Off | On

 

Off | 30Hz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Either

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

feature

 

450/4v2

 

 

 

 

 

 

 

 

 

 

 

 

 

sums the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CH 1&2 input

 

 

 

 

 

 

Left

Right

 

 

 

 

signals to

Four-ChannelSystem Amplifier

 

 

 

 

 

 

 

 

 

 

 

 

 

mono when

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

activated.

 

 

 

Left Output Right Output

Bridged: 300W x 1 (3-8Ω)

Remote

 

 

 

 

 

 

 

 

Bass Port

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CH 1 & 2 Filter Section

Freq. Range Filter Mode | Slope

 

x1 | x10 Off | 12dB | 24dB

 

95

Filter Type

75

130

60

200

 

50

500 LP | BP | HP

Filter Freq. (Hz)

CH 1 & 2 Input Section

Input Voltage

Input Sens.

 

 

Low | High

 

 

 

 

 

Input Mode

 

 

2ch | 4ch

CH 1

CH 2

1 & 2

1 & 2

Inputs

and

(Left)

(Right)

Only

3 & 4

CH 3 & 4 Filter

Section

CH 3

&

4 Input

Section

CH 3 & 4 Speaker Outputs

Freq. Range High-PassFilter

Input Voltage Input Sens.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

x1 | x10 Off | 12dB | 24dB

 

Low | High

 

 

95

Also sets

 

 

 

75

130

 

 

 

 

 

low-pass

 

 

 

60

 

cutoff for

 

 

 

200 CH 1 & 2

Left

 

Right

 

 

Bandpass

 

50

500

Filter

 

 

 

 

 

(if selected)

 

 

 

HP Filter Freq. (Hz)

CH 3

CH 4

Bridged: 150W x 1 (3-8Ω)

(Left)

(Right)

 

 

Left and Right

Jack for

Selects CH 1&2

CH 1&2

Selects

Selects CH 3&4

CH 3&4

Preamp Output Jacks

Remote Bass

HP or LP Cutoff

Left and Right

2ch / 4ch

High-PassCutoff

Left and Right

(pg. 10)

Control Knob

Frequency or HP Cutoff

Input Jacks

Input Mode

Frequency and Low-Pass

Input Jacks

 

(pg. 11)

of Bandpass Filter

(pg. 7)

(pg. 7)

Cutoff for CH 1&2 Bandpass

(pg. 7)

 

 

(pg. 8)

 

 

Filter

 

 

 

 

 

 

(pg. 10)

 

2 | JL Audio - 450/4v2 Owner’s Manual

3

PRODUCT DESCRIPTION

The JL Audio 450/4v2 is a four-channelsystem

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Class AB technology for all channels. All channels benefit from JL Audio’s exclusive R.I.P.S.

QPXFS TVQQMZ EFTJHO XIJDI PQUJNJ[FT UIF PVUQVU 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:

1)As a full-systemamplifier inbi-ampmode with CH 1&2 driving subwoofers inlow-passmode (150W x 1 or 300W x 1) and CH 3&4 driving main speakers inhigh-passmode (75W x 2).

2)As a high power four-channelsatellite amplifier in abi-amplifiedsystem, deliveringhigh-passedsignals 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-channelsatellite amplifier in atri-amplifiedsystem, deliveringband-passedsignals through CH 1&2 tomid-bassspeakers and highpassed signals through CH 3&4 to midrange/ tweeter speaker systems. Preamp outputs permit connection of a separate amplifier to drive the subwoofer system.

4)As a high power three-channelsatellite amplifier, delivering 150W x 3 at 4Ω in highpass 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.

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-throughsignals 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 fornon-fadingsub-basswith front to rear satellite fading.

As we said, it’s very flexible.

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.

%JTDPOOFDU UIF OFHBUJWF CBUUFSZ QPTU connection and secure the disconnected cable to prevent accidental re-connectionduring 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.

%P OPU JOTUBMM UIF GVTF VOUJM UIF QPXFS XJSF has been connected to the amplifier.

4)Run signal cables (RCA cables) and remote turn-onwire 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).

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-onwire 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-checkthat 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.

16)Enjoy the fruits of your labor with your favorite music.

4 | JL Audio - 450/4v2 Owner’s Manual

5

POWER CONNECTIONS

 

 

 

 

TURN-ONLEAD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Before installing the amplifier,

 

The ground connection should be made using

 

 

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

5IF iCH 1&2 Input Sectionw BMTP DPOUBJOT

disconnect the negative (ground) wire

the same gauge wire as the power connection

turn-onlead, 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-onoutput. 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

UVSO PO XIFO 7 JT QSFTFOU BU JUT iRemotew

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-metalconnection between the chassis

turn-onoutput, the amplifier’sturn-onlead 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

PG TUFSFP JOQVUT TFMFDU UIF i2chwQPTJUJPO PO

 

 

 

 

 

optimal grounding, we recommend the use

power from an ignition-switchedcircuit.

 

 

UIF iInput Modew TXJUDI BOE DPOOFDU B TJOHMF

 

 

 

 

 

of a JL Audio ECS master ground lug

 

 

5IF W T iRemotew UVSO PO DPOOFDUPS

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

iCH 1&2 Input Sectionw *O UIJT NPEF UIF

 

 

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-ChannelSystem Amplifier

 

 

 

 

 

 

Any wires run through metal barriers (such

To connect the remote turn-onwire 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

5IF W T i+12 VDCw BOE iGroundw

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-rearfading, 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

GSPOU BOE SFBS PVUQVUT TFMFDU i4chw PO UIF iInput

XJSF TJ[F GPS UIJT BNQMJGJFS

 

 

 

 

wire is exposed. When using smaller wire, it may

Modew TXJUDI MPDBUFE JO UIF iCH 1&2 Input

 

!

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

JOQVU TFDUJPOT iInput Voltagew TXJUDI XJMM

Note: Smaller AWG numbers mean bigger wire

 

It is absolutely vital that the main power

section contains a pair of RCA-typeinput 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

BOiInput VoltagewTXJUDIBOEBOiInput Sens.w

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

5IF iLoww QPTJUJPO PO FBDI iInput Voltagew

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.

 

iInput Sens.w SPUBSZ DPOUSPM XJMM PQFSBUF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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-leveloutputs, this is most likely the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

end of each wire and insert the bare wire into

fuse) types are recommended.

 

 

 

 

 

 

 

2ch | 4ch

 

 

 

 

 

 

 

 

QPTJUJPO UIBU ZPV XJMM VTF 5IF iHighw QPTJUJPO

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

 

PO FBDI iInput Voltagew TXJUDI TFMFDUT BO

 

 

 

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-outputpreamp

screw firmly, taking care not to strip the head

fuse or MaxiFuse™ type.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

level signals as well as speaker-leveloutput

of the screw.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

from source units and small amplifiers.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

To use speaker-levelsources, 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

! I M P O RTA N T

CROSSOVER CONTROLS

 

 

CH 3&4 Filter Section:

 

The output of the amplifier will decrease for

Crossovers are groups of individual electronic

2) iFilter Mode/Slopew $POUSPM 5IJT TXJUDI

 

CH 3 & 4 Filter Section

CH

a given input voltage when the “Input

filters which allow only certain frequency

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

 

 

Freq. Range High-PassFilter

Inpu

Range” switch is placed in the “High”

ranges to pass through them by attenuating

from two filter slopes.

 

 

 

 

 

 

position. Conversely, the output will be

frequencies outside the selected range. These

 

 

x1 | x10

Off | 12dB | 24dB

Lo

higher with the switch in the “Low” position.

filters allow the user to specify what frequency

iOffw %FGFBUT UIF GJMUFS GPS $) DPNQMFUFMZ

Mode

95

130

low-pass

 

75

 

 

 

 

 

 

 

 

 

Also sets

 

While this may sound counter-intuitive,it is

range will be sent out of each channel section

allowing the full range of frequencies present

 

60

200

cutoff for

 

 

Bandpass

 

 

 

 

 

 

 

 

CH 1 & 2

 

correct as described.

of the amplifier. This, in turn, allows each

at the inputs to feed that pair of channels.

| 4ch

50

500

Filter

 

1 & 2

 

 

(if selected)

 

 

 

 

 

 

 

 

 

 

 

 

speaker system to only reproduce a range of

5IJT JT VTFGVM GPS TZTUFNT VUJMJ[JOH PVUCPBSE

and HP Filter Freq. (Hz)

 

 

 

3 & 4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3) Input Sensitivity Adjustment: Located next

frequencies it is well-suitedfor, resulting in

crossovers or requiring full-rangereproduction

 

 

 

 

 

UP UIF iInput Voltagew TXJUDI JO FBDI JOQVU

reduced distortion and improved fidelity.

from that pair of channels.

 

 

 

 

 

TFDUJPO JT B SPUBSZ DPOUSPM MBCFMFE iInput

 

 

 

 

 

1) iHigh-Pass Filterw $POUSPM 5IJT TXJUDI BMMPXT

Sens.w 0ODF UIF BQQSPQSJBUF iInput Voltagew

CH 1&2 Filter Section:

 

i12dBw $POGJHVSFT UIF GJMUFS GPS $)

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

range has been selected, this control can be

trol

CH 1 & 2 Filter Section

 

to attenuate frequencies above or below the

two different filter slopes.

 

used to match the source unit’s output voltage

 

selected filter frequency at a rate of 12 dB per

 

 

 

 

 

Filter

Freq. Range Filter Mode | Slope

Input V

iOffw %FGFBUT UIF GJMUFS GPS $) DPNQMFUFMZ

to the input stage of each pair of amplifier

 

 

 

 

octave (Butterworth alignment).

channels for maximum clean output. Rotating

Hz

x1 | x10

Off | 12dB | 24dB

Low |

 

allowing the full range of frequencies present

 

 

 

 

 

 

 

the control clockwise will result in higher

e

95

130 Filter Type

 

i24dBw $POGJHVSFT UIF GJMUFS GPS $)

at the inputs to feed that pair of channels.

75

 

 

r

 

 

 

 

 

 

 

 

 

sensitivity (louder for a given input voltage).

he

60

200

 

to attenuate frequencies above or below the

5IJT JT VTFGVM GPS TZTUFNT VUJMJ[JOH PVUCPBSE

to

 

 

nput

 

 

 

 

 

 

 

Rotating the control counter-clockwisewill

hen

50

500 LP | BP | HP

 

selected filter frequency at a rate of 24 dB per

crossovers or requiring full-rangereproduction

ed.

 

 

 

 

Filter Freq. (Hz)

CH

result in lower sensitivity (quieter for a given

 

(Le

PDUBWF -JOLXJU[3JMFZ BMJHONFOU

from these channels.

 

 

 

 

 

 

 

 

 

 

input voltage). To properly set each pair

 

 

 

 

 

 

 

 

 

 

of amplifier channels for maximum clean

1) iFilter Typew $POUSPM-PDBUFEJO UIF

%FQFOEJOH PO UIF TQFBLFS TZTUFN BOE

i12dBw $POGJHVSFT UIF IJHI QBTT GJMUFS GPS $)

output, please refer to Appendix B (page 22)

iCH 1&2 Filter Sectionw UIJT TXJUDI BMMPXT

the vehicle, different filter slopes may be

3&4 to attenuate frequencies below the selected

in this manual. After using this procedure,

you to configure the CH 1&2 filter into one

required to produce a smooth transition

filter frequency at a rate of 12 dB per octave

you can then adjust the relative level of each

of three filter types:

 

between the sound of different speakers in the

(Butterworth alignment).

 

channel pair by adjusting the input sensitivity

 

 

 

 

system. Experiment to find the slope which

 

 

 

 

 

downward on either or both channel pairs, if

iLPwLow-Pass):Configures the CH 1&2

best matches the acoustic requirements of

i24dBw $POGJHVSFT UIF IJHI QBTT GJMUFS GPS $)

they require attenuation to achieve the desired

filter to attenuate frequencies above

UIF TZTUFN 5IF TIBSQFS i24dBw TFUUJOH XJMM

3&4 to attenuate frequencies below the selected

TZTUFN CBMBODF %P OPU JODSFBTF UIF iInput

the selected filter frequency. Useful

do a better job of protecting small speakers

filter frequency at a rate of 24 dB per octave

Sens.wTFUUJOH GPS BOZ BNQMJGJFS JO UIF TZTUFN

for connection of subwoofer(s) to CH

with limited power handling. The shallower

-JOLXJU[3JMFZ BMJHONFOU

beyond the maximum level established during

1&2 in a bi-amplifiedsystem.

i12dBw PDUBWF TFUUJOH BMMPXT UIF SFBS TQFBLFST

 

 

 

 

 

the procedure outlined in Appendix B (page

 

 

 

 

to reproduce more low-frequencycontent.

%FQFOEJOH PO UIF TQFBLFS TZTUFN BOE UIF

%PJOH TP XJMM SFTVMU JO BVEJCMF EJTUPSUJPO

iBPw #BOEQBTT $POGJHVSFT UIF GJMUFS UP

 

vehicle, different filter slopes may be required to

and possible speaker damage. Be aware that

attenuate frequencies above the selected filter

3) iFreq. RangFw $POUSPM 8IFO UISPXO UP

produce a smooth transition between the speakers

CPUI iInput Sens.w BEKVTUNFOUT XJMM IBWF UP CF

frequency and below the frequency selected

the right, this switch multiplies the cutoff

in the system. Experiment to find the slope

made, regardless of how many input cables are

in the CH 3&4 High-PassFilter. This creates

GSFRVFODZ TFMFDUFE CZ UIF SPUBSZ iFilter Freq.

which best matches the acoustic requirements

feeding the amplifier. These controls will allow

a true bandpass filter well-suitedfor driving

(Hz)w DPOUSPM CZ B GBDUPS PG *O UIF ix1w

PG ZPVS TZTUFN 5IF TIBSQFS i24dBw TFUUJOH

you to set the appropriate relative levels for CH

mid-bassormid-rangespeakers in a tri-

position, the range of the rotary control is

will do a better job of protecting small speakers

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

amplified system.

 

)[ BT NBSLFE *O UIF ix10w

with limited power handling. The shallower

channels in the system.

 

 

 

 

position, the range of the rotary control is

i12dBw PDUBWF TFUUJOH BMMPXT UIF SFBS TQFBLFST UP

 

iHPwHigh-Pass):Configures the CH 1&2

)[ L)[ )[

reproduce more low-frequencycontent.

 

filter to attenuate frequencies below the

 

 

 

 

 

 

 

selected filter frequency. Useful for connection

4) iFilter Freq. (Hz)w 5IF GJMUFS GSFRVFODZ

2) iFreq. Rangew $POUSPM 8IFO UISPXO UP UIF

 

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

markings surrounding this rotary control

right, this switch multiplies the cutoff frequency

 

amplified system.

 

are for reference purposes and are generally

TFMFDUFE CZ UIF SPUBSZ iFilter Freq. (Hz)w

 

 

 

 

 

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

DPOUSPM CZ B GBDUPS PG *O UIF ix1w QPTJUJPO

 

 

 

 

 

would like to select the filter cutoff frequency

UIF SBOHF PG UIF SPUBSZ DPOUSPM JT )[ BT

 

 

 

 

 

with a higher level of precision, consult the

NBSLFE *O UIF ix10w QPTJUJPO UIF SBOHF PG UIF

 

 

 

 

 

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

SPUBSZ DPOUSPM JT )[ L)[ )[

8 | JL Audio - 450/4v2 Owner’s Manual

9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SPEAKER OUTPUTS

 

 

 

 

 

 

 

3) iFilter Freq. (Hz)w 5IF GJMUFS GSFRVFODZ

3) iALLw 5IJT NPEF EFMJWFST B TVN PG UIF TJHOBMT

1) iInfrasonic Filterw 5IF JOGSBTPOJD GJMUFS JT B

The 450/4v2 employs JL Audio’s exclusive

markings surrounding this rotary control

CFJOH GFE UP UIF iCH 1&2 Input Sectionw BOE

 

24 dB/octave high-passfilter, with a fixed

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

are for reference purposes and are generally

iCH 3&4 Input Sectionw PG UIF BNQMJGJFS

 

DVUPGG GSFRVFODZ PG )[ 5IJT GJMUFS JT

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

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

designed to conserve amplifier power and

independent for each pair of channels. This

would like to select the filter cutoff frequency

 

The Preamp Output signal is not affected by

 

protect subwoofer systems without audibly

sophisticated power supply allows the amplifier

with a higher level of precision, consult the

UIF iLF Boostw PS iInfrasonic Filterw QSPDFTTJOH

 

degrading the sub-bassoutput. With ported

to produce its optimum power (150 watts x 2 for

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

selected for the amplifier or by any crossover

 

enclosures, the use of the infrasonic filter

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

 

 

 

 

 

 

 

 

 

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

 

is highly recommended to protect the

over a wide range of speaker impedances.

Preamp Output Section

 

 

 

the preamp output will be full-range).When

 

speaker(s) from excessive excursion below

Unlike conventional amplifiers that require

The 450/4v2 incorporates a pass-through

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

 

box tuning. With sealed enclosures, the

a specific impedance to produce optimum

preamp output section, so that additional

rear speaker systems, this preamp output mode

 

use of the filter is less necessary, but can

power, the R.I.P.S.-equipped450/4v2 gives

amplifiers can be added to the system. This pass-

will deliver a summed front/rear signal to the

 

still help protect the speaker system. The

you the freedom to use a variety of speaker

through pre-ampoutput can be configured three

subwoofer amplifier, while permitting fading

 

infrasonic filter can be completely defeated

configurations that achieve final nominal

EJGGFSFOU XBZT VTJOH UIF TXJUDI MBCFMFE iSignal

of the front and rear speaker systems from the

 

CZ TFMFDUJOH UIF iOffw QPTJUJPO PO UIF

impedances between 1.5 – 4Ω per channel in

Fromw JO UIF iPreamp Output Sectionw

source unit.

 

 

 

 

 

 

 

 

 

 

 

 

iInfrasonic Filterw TXJUDI 5IJT CZQBTTFT BMM

stereo (without sacrificing power output or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

signal from flowing through the circuit.

sound quality). When bridged, each channel

 

Preamp Output Section

 

CH

Note 5IFTJHOBMMFWFMPGUIFiPreamp Outputw

 

 

 

 

 

 

 

QBJS XJMM PQUJNJ[F PVUQVU CFUXFFO o ͙

 

Signal From

 

 

 

2) iBass EQw 5IJT TXJUDI BMMPXT UIF VTFS UP

 

 

 

 

 

 

 

 

 

is always low level regardless of the voltage

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

applied to this amplifier’s inputs and the

 

BDUJWBUF B E# CPPTU DFOUFSFE BU )[

entirely automatic and adjusts itself every time

 

1 & 2 | 3 & 4 | All

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

setting chosen on this amplifier’s “Input

 

 

 

 

the amplifier is turned on according to the

 

 

 

 

 

 

 

 

 

Range” switch. A JL Audio amplifier receiving

3) iRemote Bass Portw "MMPXT ZPV UP DPOOFDU BO

lowest impedance present at the speaker load.

 

Left Output Right Output

 

 

 

signal from this preamp output should have

 

optional remote boost knob (sold separately,

There are no user controls to configure. The

 

 

 

 

its “Input Range” switch set to“Low”.

 

JL Audio Model RBC-1)that can be mounted

system operates through multiple stages of

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

JNQFEBODF PQUJNJ[BUJPO DIPPTJOH UIF TUBHF

 

 

 

 

 

 

 

 

 

CH 1 & 2 Bass Control

 

 

 

 

 

 

connected, the boost is no longer limited to 0

most appropriate to the actual impedance of the

1) i1&2w 5IF QSFBNQ PVUQVU EFMJWFST UIF TBNF

 

This section provides two basic bass processing

 

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

speakers you connect to it.

 

 

 

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

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

 

to be selected.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ction

 

CH 1 & 2 Speaker Outputs

 

CH

CH 1&2 Inputs. This mode is useful for

BU )[ BOE B E# CPPTU DJSDVJU DFOUFSFE BU

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

feeding a subwoofer amplifier when the

)[ "DUJWBUJPO PG FJUIFS GFBUVSF BVUPNBUJDBMMZ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

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

 

!

I M P O RTA N T

 

 

 

 

 

 

 

 

 

 

 

 

 

O

The “Bass EQ” and “Infrasonic Filter” features

 

 

 

 

 

 

 

 

 

 

 

 

 

 

speaker systems. This preamp output mode

features should only be used when driving

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

subwoofer(s) from CH 1&2).

will only operate when the CH 1&2 filter is

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Left

Right

 

 

 

fading of the rear channels without affecting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

activated and in low-passmode. If you are

 

 

 

150W (1.5-4Ω)

150W

 

 

 

 

ts

 

CH 1 & 2 Bass Control

 

CH 1

 

utput

 

Bridged: 300W x 1 (3-8Ω)

 

R

 

 

 

 

 

 

the subwoofer level.

 

 

 

 

 

 

using an external active crossover and would

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ba

 

 

 

 

 

 

Bass EQ

Infrasonic Filter

 

Freq.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

like to use the “Bass EQ” and “Infrasonic

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2) i3&4w 5IF QSFBNQ PVUQVU EFMJWFST UIF TBNF

 

 

 

Off | On

 

Off | 30Hz

 

 

 

x1

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

Either

 

75

 

switch on “12dB” and rotate the frequency

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

sums the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

feature

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

CH 1&2 input

 

60

 

 

 

selection knob fully clockwise to the “500 Hz”

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

mono when

 

50

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

signals to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

subwoofer amplifier when the 450/4v2 is being

 

 

 

 

 

 

 

activated.

 

 

 

 

 

position. This will activate the bass controls

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Remote

 

 

 

 

 

 

 

Filter F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

used to drive front and rear speaker systems.

 

 

 

Bass Port

 

 

 

 

 

 

 

 

 

 

 

without significantly affecting the crossover

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This preamp output mode will track the signal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

point selected by the external active crossover.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

channels without affecting the subwoofer level.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

11

!

I M P O RTA N T

BRIDGING CONSIDERATIONS

 

 

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

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.

indicate that this has happened). See page 13

ction

CH 3 & 4 Speaker Outputs

Sens.

 

for details.

 

 

 

 

!

I M P O RTA N T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Left

Right

 

 

 

 

 

Speaker loads below 1.5Ω nominal per channel

 

75W (1.5-4Ω)

75W

4

Bridged: 150W x 1 (3-8Ω)

in stereo or 3Ω nominal in bridged mode are

ht)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

not recommended and may cause the amplifier

 

 

 

 

 

 

 

 

 

output to distort excessively.

 

 

 

 

 

 

 

 

 

5P CSJEHF B QBJS PG DIBOOFMT VTF UIF iLeft +w BOE iRight wTQFBLFS DPOOFDUPST POMZ UIF iLeft

wBOE iRight +w SFNBJO VOVTFE 5IFO DPOOFDU a mono signal to both left and right RCA inputs for that channel pair. This requires an RCA i: "EBQUPSw MJLF UIF +- "VEJP &$4 NPEFM

XB-CLRAICY-1F2M(sold separately). When bridged, each channel pair will deliver optimum power into a3-8Ωload. 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

BNQMJGJFS UP PWFSIFBU %P OPU EP UIJT *OTUFBE VTF B i: BEBQUPSw UP TQMJU UIF NPOP TJHOBM JOUP CPUI left and right RCA inputs.

STATUS INDICATOR LIGHTS / PROTECTION CIRCUITRY

There are three status indicator lights on the top of the amplifier. These are as follows:

1) iPowerwGreen): lights to indicate that the amplifier is turned on and operating normally.

2) iThermalwRed): lights to indicate that the amplifier has exceeded its safe operating temperature, putting the amplifier into a selfprotection mode, which reduces the power output of the amplifier. The red light will shut off and the amplifier will return to normal,full-poweroperating mode if the heat sink temperature drops back to a safe level.

3) iLow ΩwAmber): 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-circuitis 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 ashort-circuitby only connecting one of the amplifier sections at a time (CH 1&2 and CH

5IF BNCFS -&%XJMM MJHIU XIFO ZPV connect the section that is experiencing the problem and turn the volume up.

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

i1PXFSw JOEJDBUPS PO UIF UPQ PG UIF BNQMJGJFS XJMM 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 bassheavy 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).

SERVICING YOUR JL AUDIO AMPLIFIER

If your amplifier fails or malfunctions, please

SFUVSO JU UP ZPVS BVUIPSJ[FE +- "VEJP EFBMFS TP 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

USBJOFE TFSWJDF QFSTPOOFM %P OPU BUUFNQU to service the amplifier yourself or through

VOBVUIPSJ[FE SFQBJS GBDJMJUJFT 5IJT XJMM OPU POMZ void the warranty, but may result in the creation of more problems within the amplifier.

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.

JL Audio Technical Support:

(954) 443-1100

9:00 AM – 5:30 PM (Eastern Time Zone)

Monday - Friday

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

13

SYSTEM CONFIGURATIONS

The 450/4v2 is a very flexible amplifier, wellsuited 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.

BI-AMPLIFIEDSYSTEMS

Bi-amplifiedsystems are defined as systems in which separate amplifier channels drive lowfrequency (LF) andhigh-frequency(HF) speakers and are separately filtered to send appropriate frequency ranges to each speaker system.

The most common application of biamplification in mobile audio is to drive a subwoofer system from one or more amplifiers or channels and component speakers from separate amplifiers or channels.

The 450/4v2 can be configured to drive a bi-amplifiedsystem by itself or with a separate subwoofer amplifier.

Bi-AmplifiedSystem 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-passfiltering. CH 3&4 will drive component speakers in stereo (75W x 2) withhigh-passfiltering.

Input connection options for a bi-amplifiedsystem with one 450/4v2 are as follows:

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 connected to the CH 1&2 inputs of

UIF W TFMFDUi2chwPOUIFiInput Modew TXJUDIJOUIFiCH 1&2 Input Sectionw

Result: the relative level of the LF and HF

DIBOOFMT XJMM CF GJYFE CZ UIF W T iInput Sens.w TFUUJOHT BOE XJMM OPU CF VTFS BEKVTUBCMF from the front of the vehicle.

B)Fade Subwoofer Level vs. HF Level Required:a source unit or processor with front

and rear pairs of outputs.

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

JOQVUT TFMFDU i4chw PO UIF iInput Modew TXJUDI JO UIF iCH 1&2 Input Sectionw

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

BNQMJGJFS TFDUJPOT iInput Sens.w DPOUSPMT

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

JOQVUT TFMFDUi4chwPOUIFiInput Modew TXJUDIJOUIFiCH 1&2 Input Sectionw

Result: in this mode, the user has the ability to control the absolute level of the LF channels relative to the HF channels.

! I M P O RTA N T

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.

Crossover Setup for Bi-AmplifiedSystem with one 450/4v2:

Once the input sections have been

DPOGJHVSFE BQQSPQSJBUFMZ HP UP UIF iCH 1&2 Filter Sectionw 4FMFDU ix1w PO UIF iFreq. RangewTXJUDI iLPw MPX QBTT PO UIF iFilter Typew TXJUDI BOE i12dBw PS i24dBw PO UIF iFilter Mode/Slopew TXJUDI BOE BO BQQSPQSJBUF iFilter Freq w )[ JT B HPPE TUBSUJOH point). You may also choose to activate the iInfrasonic Filterw BOE PS iBass EQw GFBUVSFT JO UIF iCH 1&2 Bass Controlw TFDUJPO 1MFBTF LFFQ JO NJOE UIBU BDUJWBUJPO PG UIF iBass EQw NBZ SFRVJSF MPXFSJOH UIF $) iInput Sens wUP NBJOUBJO DMFBO NBYJNVN PVUQVU

/FYU UVSO ZPVS BUUFOUJPO UP UIF iCH 3&4 Input Sectionw BOE TFMFDU ix1w PO UIF iFreq. Rangew TXJUDI iHPw IJHI QBTT PO UIF iFilter Typew TXJUDI BOE i12dBw PS i24dBw PO UIF iFilter Mode/Slopew TXJUDI BOE BO BQQSPQSJBUF iFilter Freq.w BHBJO)[ JT B HPPE TUBSUJOH QPJOU

After proper adjustment of the CH

BOE $) iInput Rangew BOE iInput Sens.w DPOUSPMT VTJOH UIF NFUIPE 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).

Bi-AmplifiedSystem with one 450/4v2 infour-channelmode and a separate subwoofer amplifier

This configuration requires that the separate subwoofer amplifier has a built-inlow-passfilter. 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-passfiltering. CH 3&4 will drive rear component speakers in stereo (75W x 2) withhigh-passfiltering.

The separate amplifier will drive the subwoofer system with low-passfiltering (select a filter

GSFRVFODZ PG )[ UP TUBSU 5IF JOQVUT PG UIF subwoofer amplifier may or may not be connected to the preamp outputs of the 450/4v2, depending on which connection option you choose.

Input connection options for a bi-amplifiersystem with one 450/4v2 and a separate subwoofer amplifier are as follows:

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

JOQVUT PG UIF W TFMFDU i2chw PO UIF iInput Modew TXJUDI JO UIF iCH 1&2 Input Sectionw $POOFDU UIF TVCXPPGFS BNQMJGJFS inputs to the preamp outputs of the 450/4v2

4FMFDU i1&2w PO UIF i4JHOBM 'SPNw TXJUDI JO UIF iPreamp Output Sectionw

Result: the relative level of the LF and front and rear HF channels will be fixed by the 450/4v2’s iInput Sens.wTFUUJOHTBOEXJMMOPUCFVTFS adjustable from the front of the vehicle.

B) Fade Subwoofer Level vs. HF Level Required:a source unit or processor with front

and rear pairs of stereo outputs.

Input Connections: one stereo pair of source unit outputs is connected to the CH 1&2

JOQVUT PG UIF W TFMFDU i2chw PO UIF iInput Modew TXJUDI JO UIF iCH 1&2 Input Sectionw 5IF TFDPOE TUFSFP QBJS PG TPVSDF unit outputs 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 level of the subwoofer amplifier’s input relative to the HF channels, but cannot controlfront-to-rearfading of the

HF channels. The relative level of the front and rear HF channels will be fixed by the 450/4v2’s iInput Sens.wTFUUJOHTBOEXJMM OPU CF VTFS adjustable from the front of the vehicle.

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

15

C)Fade HF Front to Rear with Non-FadingSubwoofer Level

Required: a source unit or processor with front and rear pairs of stereo outputs.

Input Connections: one stereo pair of source unitoutputs-isconnected to the CH 1&2

JOQVUT PG UIF W TFMFDU i4chw PO UIF iInput Modew TXJUDI JO UIF iCH 1&2 Input Sectionw 5IF TFDPOE TUFSFP QBJS PG TPVSDF 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

W 4FMFDU iALLw PO UIF iSignal Fromw TXJUDI JO UIF iPreamp Output Sectionw

Result: with this option, the user has the ability to fade the HF signals fromfront-to-rearwithout fading the signal to the subwoofer amplifier.

D)Subwoofer Level Control Only

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

JOQVUT PG UIF W TFMFDU i2chw PO UIF iInput Modew TXJUDI JO UIF iCH 1&2 Input Sectionw 5IF TPVSDF VOJUT EFEJDBUFE 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 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.

! I M P O RTA N T

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.

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.

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

JOQVUT PG UIF W TFMFDU i4chw PO UIF iInput Modew TXJUDI JO UIF iCH 1&2 Input Sectionw 5IF TPVSDF VOJUT EFEJDBUFE 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.

! I M P O RTA N T

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.

Crossover Setup for Bi-AmplifiedSystem with one 450/4v2 and a separate subwoofer amplifier:

Once the input and preamp output sections have been configured appropriately, go to the iCH 1&2 Filter Sectionw 4FMFDU ix1w PO UIF iFreq. RangewTXJUDI iHPw IJHI QBTT PO UIF i'JMUFS 5ZQFw TXJUDI BOE i12dBw PS i24dBw PO UIF i'JMUFSMode/SlopFw TXJUDI BOE BO BQQSPQSJBUF iFilter Freq.w )[ JT B HPPE TUBSUJOH QPJOU 5IF iInfrasonic Filterw BOE iBass EQw GFBUVSFT cannot be used in this mode.

/FYU UVSO ZPVS BUUFOUJPO UP UIF iCH 3&4 Input Sectionw BOE TFMFDUix1wPOUIFiFreq. RangewTXJUDI iHPw IJHI QBTT POUIFiFilter TypewTXJUDIBOEi12dBwPSi24dBwPOUIFiFilter Mode/SlopewTXJUDIBOEBOBQQSPQSJBUFiFilter Freq.w BHBJO )[JTBHPPETUBSUJOHQPJOU

After proper adjustment of the 450/4v2’s CH 1&2 and CH 3&4, and the subwoofer amplifier’s iInput Rangew BOE iInput Sens.w ZPV DBO GJOF tune filter frequencies and slopes and attenuate either pair of channels to achieve proper balance.

'PS QSPQFS BEKVTUNFOU PG UIF iInput Sens.w 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.

Bi-Amplified3.1 System with one 450/4v2 inthree-channelmode and a separate subwoofer amplifier

This configuration requires a separate subwoofer amplifier with a built-inlowpass filter. All JL Audio subwoofer amplifiers have this feature.

The separate amplifier will drive the subwoofer system with low-passfiltering (select a filter

GSFRVFODZPG )[UPTUBSU 5IFJOQVUTPG the subwoofer amplifier will be connected to the preamp outputs of the 450/4v2 or to the source unit or multi-channelprocessor directly.

In this configuration, CH 1&2 of the 450/4v2 will drive front-leftandfront-rightcomponent speakers (stereo 150W x 2) withhigh-passfiltering. CH 3&4 will be bridged mono to drive acenter-frontcomponent speaker system (150W x 1) withhigh-passfiltering. All three channels will have equal power at 3 – 4Ω.

Input connection options for bi-amplified3.1 system with one 450/4v2 and a separate subwoofer amplifier:

A) Real Left-Center-Right Channels and Subwoofer with Multi-Channel Source Required:a multi-channel processor or source

VOJU %PMCZ %JHJUBM¥ %PMCZ 1SP-PHJD**¥EUT¥ etc.) with center channel output.

Input Connections: theleft-frontandright-frontsource unit outputs are connected to the CH 1&2 inputs of the 450/4v2 and thefront-centerchannel output of the source unit or processor is connected to the CH 3&4 inputs of the

W TFMFDU i4chw PO UIF iInput Modew TXJUDI JO UIF iCH 1&2 Input Sectionw 6TF B i: BEBQUPSw MJLF UIF +- "VEJP &$4 NPEFM 9#

CLRAICY-1F2M(sold separately) to feed both RCA jacks on the amplifier from the single signal cable. Mostmulti-channelprocessors 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 withmulti-channelmaterial, derived center channel with stereo material.Rear-surroundchannels are unused. User adjustability of left, center and right channels depends on source unit/ processor. Subwoofer level is user adjustable.

! I M P O RTA N T

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.

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! I M P O RTA N T

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 multichannel source, but it can be used to create a convincing sound stage in some applications.

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

JOQVUT PG UIF W TFMFDU i2chw PO UIF iInput Modew TXJUDI JO UIF iCH 1&2 Input Sectionw $POOFDU UIF TVCXPPGFS BNQMJGJFS inputs to the preamp outputs of the 450/4v2

4FMFDU i1&2w PO UIF iSignal Fromw TXJUDI JO UIF iPreamp Output Sectionw

Result: the relative level of all channels will be

GJYFE CZ UIF W T iInput Sens.w TFUUJOHT and will not be user adjustable from the front of the vehicle.

C)Fade Between “Summed Center Channel” Level and Left/Right Level with Non-FadingSubwoofer 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

JOQVUT PG UIF W TFMFDU i4chw PO UIF iInput Modew TXJUDI JO UIF iCH 1&2 Input Sectionw " TFDPOE QBJS PG TPVSDF VOJU outputs is connected to the CH 3&4 inputs. Connect the subwoofer amplifier inputs to the

QSFBNQ PVUQVUT PG UIF W 4FMFDU iALLw PO UIF iSignal Fromw TXJUDI JO UIF iPreamp Output Sectionw

Result: with this option, the user has the ability

UP BEKVTU UIF SFMBUJWF MFWFM PG UIF i4VNNFE $FOUFS $IBOOFMw JOQVU SFMBUJWF UP UIF -FGUBOE

Right channel pair via the source unit’s fader control. Subwoofer is non-fading.

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.

Input Connections: one pair of stereo source unit outputs is connected to the CH 1&2

JOQVUT PG UIF W TFMFDU i4chw PO UIF iInput Modew TXJUDI JO UIF iCH 1&2 Input Sectionw " TFDPOE QBJS PG TPVSDF VOJU 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

GBEF CFUXFFO UIF i4VNNFE $FOUFS $IBOOFMw 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.

! I M P O RTA N T

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.

Crossover setup for bi-amplified3.1 system with one 450/4v2 and a separate subwoofer amplifier:

Once the input and preamp output sections have

CFFODPOGJHVSFEBQQSPQSJBUFMZ HPUPUIFiCH 1&2 Filter Sectionw 4FMFDUix1wPOUIFiFreq. RangewTXJUDI iHPw IJHI QBTT POUIFiFilter TypewTXJUDIBOEi12dBwPSi24dBwPOUIF iFilter Mode/Slopew TXJUDIBOE BO BQQSPQSJBUF iFilter Freq.w )[JTBHPPETUBSUJOHQPJOU 5IFiInfrasonic FilterwBOEiBass EQwGFBUVSFT cannot be used in this mode.

/FYU UVSOZPVSBUUFOUJPOUPUIFiCH 3&4 Input SectionwBOETFMFDUix1wPOUIFiFreq. RangewTXJUDI iHPw IJHI QBTT POUIFiFilter TypewTXJUDIBOEi12dBwPSi24dBwPOUIFiFilter Mode/SlopewTXJUDIBOEBOBQQSPQSJBUFiFilter Freq.w BHBJO )[JTBHPPETUBSUJOHQPJOU

After proper adjustment of the 450/4v2’s CH 1&2 and CH 3&4, and the subwoofer

BNQMJGJFST iInput Rangew BOE iInput Sens.w you can fine tune filter frequencies and slopes and attenuate the center channel or the left

BOESJHIUDIBOOFMQBJSXJUIUIFiInput Sens.w controls to achieve proper balance. For proper

BEKVTUNFOU PG UIF iInput Sens.w DPOUSPMT PG UIF

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.

Bi-Amplified5.1 System withMulti-ChannelSource, one 450/4v2 inthree-channelmode, 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-channelamplifier to drive rear surround speakers, effectively creating a true 5.1multi-channelsystem withleft-front,center-front,right-front,left-rearandleft-rightchannels.

The 300/2v2 in two-channelstereo 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.

To add this capability, connect the 300/2v2’s inputs to the rear (surround) outputs of a multichannel processor or source unit and set the

W T iAmp FilterwJO iHPw NPEF XJUI B i12dBw PS i24dBw GJMUFS TMPQF

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TRI-AMPLIFIEDSYSTEMS

Tri-amplifiedsystems are defined as systems in which separate amplifier channels drivelow-frequency(LF),mid-frequency(MF) andhigh-frequency(HF) speakers and are separately filtered to send appropriate frequency ranges to each speaker system.

The most common application of triamplification in mobile audio is to drive a subwoofer system from one or more amplifiers or channels (LF channels), mid-rangespeakers from a separate amplifier or set of channels (MF channels) andhigh-frequencyspeakers from a separate amplifier or set of channels (HF channels). One such configuration is to run subwoofers off the LF channel(s), midbass 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-woofersoff 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-amplifiedsystem in conjunction with a separate subwoofer amplifier that includes alow-passfilter. 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).

Input connection options for the Tri-AmplifiedStereo mode are as follows:

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

JOQVUT PG UIF W TFMFDU i2chw PO UIF iInput Modew TXJUDI JO UIF iCH 1&2 Input Sectionw 4VCXPPGFS BNQMJGJFS JOQVUT are connected to the preamp outputs of the

W 4FMFDU i1&2w PO UIF iSignal Fromw TXJUDI JO UIF iPreamp Output Sectionw

Result: the relative level of all channels will be

GJYFE CZ UIF W T iInput Sens.w TFUUJOHT and will not be user adjustable from the front of the vehicle.

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

JOQVUT PG UIF W TFMFDU i2chw PO UIF iInput Modew TXJUDI JO UIF iCH 1&2 Input Sectionw BOE UIF TFDPOE TUFSFP QBJS PG TPVSDF 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 andhigh-frequencychannels via the source unit’s fader control, without exceeding the maximum clean output level set by each

BNQMJGJFS TFDUJPOT iInput Sens.w DPOUSPMT

C) Subwoofer Level Control Only Required: a source unit or processor with left, right and dedicated subwoofer outputs is required.

Input Connections: one stereo pair of source unit outputs is connected to the CH 1&2

JOQVUT PG UIF W TFMFDU i2chw PO UIF iInput Modew TXJUDI JO UIF iCH 1&2 Input Sectionw BOE UIF TPVSDF VOJUT EFEJDBUFE 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.

! I M P O RTA N T

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.

Crossover setup for tri-amplified3.1 system with one 450/4v2 and a separate subwoofer amplifier:

Once the input and preamp output sections have

CFFO DPOGJHVSFE BQQSPQSJBUFMZ HP UP UIF iCH 1&2 Filter Sectionw PG UIF W 5IFTF TFUUJOHT will determine thehigh-passcutoff and slope of the bandpass filtering applied to the MF (mid-

GSFRVFODZ DIBOOFMT 4FMFDU ix1w PO UIF iFreq. RangewTXJUDI iBPw CBOEQBTT PO UIF iFilter Typew TXJUDI BOE i12dBw PS i24dBw PO UIF iFilter Mode/Slopew TXJUDI BOE BO BQQSPQSJBUF iFilter Freq.w )[ JT B HPPE TUBSUJOH QPJOU 5IF iInfrasonic Filterw BOE iBass EQw GFBUVSFT cannot be used in this mode.

/FYU UVSO ZPVS BUUFOUJPO UP UIF iCH 3&4 Input Sectionw 5IFTF TFUUJOHT XJMM EFUFSNJOF thehigh-passcutoff and slope of the high pass filtering applied to the HF(high-frequency)channels as well as thelow-passcutoff frequency and slope for the MF channels’ bandpass filter.

4FMFDU ix1w PO UIF iFreq. Rangew TXJUDI JG ZPVS desired MF to HF crossover frequency is below

)[ 4FMFDU ix10w PO UIF iFreq. Rangew TXJUDI if your desired MF to HF crossover frequency

JT BCPWF )[ 4FMFDU iHPw IJHI QBTT PO UIF iFilter Typew TXJUDI BOE i12dBw PS i24dBw PO UIF iFilter Mode/Slopew TXJUDI BOE BO BQQSPQSJBUF iFilter Freq.w

After proper adjustment of the 450/4v2’s CH 1&2 and CH 3&4, and the subwoofer amplifier’s iInput Rangew BOE iInput Sens.w ZPV DBO GJOF tune filter frequencies and slopes and attenuate the LF, MF and HF channel pair or with the iInput Sens.w DPOUSPMT UP BDIJFWF QSPQFS CBMBODF

'PS QSPQFS BEKVTUNFOU PG UIF iInput Sens.w 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.

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APPENDIX A:

Precise Frequency Selection Chart

“FILTER FREQ” CH 1&2 / CH 3&4

Detent

Panel

Actual

Number

Marking

Freq.

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

APPENDIX B:

 

 

 

 

 

 

 

 

 

 

 

 

Input Sensitivity Level Setting

3) 4XJUDI UIF iInput Voltagew UP iLoww BOE

8) *ODSFBTF UIF iInput Sens w DPOUSPM VOUJM

 

UVSO UIF iInput Sens.w DPOUSPM PO CPUI TFUT PG

 

the target voltage is delivered for that set

APPENDIX A:

channels all the way down.

 

 

of channels. If excessive voltage is read

Input Sensitivity Level Setting

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

 

 

on either set of channels with the control

+-"VEJPBNQMJGJFST VUJMJ[JOH UIF 3FHVMBUFE

volume. If either set of channels is being

 

 

at minimum (full counterclockwise),

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

driven by a source unit’s dedicated subwoofer

 

TXJUDI UIF BQQSPQSJBUF iInput Voltagew

delivery of their rated power when connected

output, also adjust the source unit’s subwoofer

 

TXJUDI UP iHighw BOE SF BEKVTU

to any load impedance from 1.5 - 4Ω per

level control to 3/4 of maximum output. This

9) Once you have adjusted each set of channels to

channel and when connected to a charging

will allow for reasonable gain overlap with

 

its maximum unclipped output level, reconnect

system with any voltage from 11 - 14.5V. This

moderate clipping at full volume.

 

 

UIF TQFBLFS T 5IF iInput Sens.w DPOUSPMT DBO

design is beneficial for many reasons. One of

5) Using the chart below, determine the

 

 

now be adjusted downward if either or both

these reasons is ease of setup. Because each

target voltage for input sensitivity

 

 

sets of channels requires attenuation to achieve

JL Audio amplifier will always deliver the

adjustment according to the nominal

 

 

the desired system balance.

 

same amount of power within its operational

impedance of the speaker system

 

 

 

 

 

 

 

 

range of impedances and supply voltages, the

connected to each set of outputs.

 

 

 

 

 

 

 

 

 

 

!

I M P O RTA N T

 

 

 

maximum, unclipped output is very predictable.

6) Verify that you have disconnected the speakers

 

 

 

 

Do not increase any “Input Sens.” setting in

This makes setting the gain structure via the

before proceeding. Play a track with an

 

input sensitivity controls very simple. Following

appropriate sine wave (within the frequency

the system beyond the maximum level

the directions below will allow the user to adjust

range to be amplified by each set of channels)

established during this procedure. Doing so

the input sensitivity of the amplifier(s) simply

at 3/4 source unit volume.

 

will result in audible distortion and possible

and easily in just a few minutes using equipment

7) $POOFDU UIF "$ WPMUNFUFS UP UIF iCH 1&2

speaker damage.

 

which is commonly available in installation bays.

Speaker Outputsw PS iCH 3&4 Speaker

 

 

 

 

 

 

 

 

 

Outputsw DPOOFDUPST PG UIF BNQMJGJFS *G UIF

 

*U XJMM CF OFDFTTBSZ UP SF BEKVTU UIF iInput

Necessary Equipment

channel pair is operating in stereo, it is only

Sens.w GPS UIF BGGFDUFE DIBOOFMT JG BOZ FRVBMJ[FS

t %JHJUBM "$ 7PMUNFUFS

necessary to measure one channel. If bridged,

CPPTU JT BDUJWBUFE BGUFS TFUUJOH UIF iInput

t $% XJUI B TJOF XBWF UFTU UPOF SFDPSEFE BU

make sure you test the voltage at the correct

Sens.wXJUI UIJT QSPDFEVSF 5IJT BQQMJFT UP

0 dB reference level in the frequency range

connectors (L+ and R–).

 

 

 

any EQ boost circuit, including the amplifier’s

to be amplified for that set of channels

 

 

 

 

 

iBass EQw BOE TPVSDF VOJU UPOF DPOUSPMT PS &2

)[ GPS TVCXPPGFS DIBOOFMT L)[ GPS

 

 

 

 

 

circuits. EQ cuts will not require re-adjustment.

a midrange application). The CleanSweep®

 

 

 

 

 

 

 

 

 

 

 

 

$BMJCSBUJPO %JTD DPOUBJOT UIF BQQSPQSJBUF

 

 

 

 

 

 

 

 

 

 

 

 

test tones and is available for sale at

 

 

 

 

 

 

 

 

 

 

 

 

http://store.jlaudio.com %P OPU VTF BUUFOVBUFE

Nom.

CHANNELS 1&2

 

 

 

CHANNELS 3&4

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

 

 

 

 

 

 

 

 

 

 

Impedance

Stereo

Bridged

Stereo

Bridged

 

 

 

 

The Nine-StepProcedure

 

 

 

 

 

 

 

 

 

 

 

 

 

24.5 V

 

49.0 V

 

 

 

17.3 V

 

34.6 V

(follow this procedure for each pair of channels)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1) %JTDPOOFDU UIF TQFBLFS T GSPN UIF

 

24.5 V

 

42.4 V

 

 

 

17.3 V

 

30.0 V

BNQMJGJFST iFront Speaker Outputsw BOE

 

 

 

 

 

 

 

 

 

 

 

 

 

24.5 V

 

34.6 V

 

 

 

17.3 V

 

24.5 V

iRear Speaker Outputsw DPOOFDUPST

 

 

 

 

 

 

2) Turn off all processing on the source

 

21.2 V

 

30.0 V

 

 

 

15.0 V

 

21.2 V

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Set fader control to center position

 

17.3 V

 

not recommended

12.2 V

 

not recommended

and subwoofer level control to 3/4 of

 

 

 

 

 

 

 

 

 

 

 

 

1.5Ω

 

15.0 V

 

not recommended

10.6 V

 

not recommended

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

23

APPENDIX C: TROUBLE SHOOTING

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

Please refer to Appendix B (page 22) to set the input sensitivity for maximum,low-distortionoutput.

“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 thefuse-holder.

Check the integrity of the connections made to each of the i+12VDCw iGroundw BOE iRemotew UFSNJOBMT. 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, theturn-onlead 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+12VDCwwire to the iRemotewterminal to see if the amplifier turns on.

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

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

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

Check your voltage source and grounding point. The power supply 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

FYUSFNFMZ EJGGJDVMU UP EFUFDU XJUI B DPNNPO %$ WPMUNFUFS

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 turns on, but there is no output”

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

FYBNQMF )[ GPS B TVC CBTT BQQMJDBUJPO PS L)[ GPS B GVMM range / high-passapplication). A steady, sufficient voltage (between 200mV and8.0-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.

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

25

APPENDIX D:

450/4v2 Specifications

General Specifications:

Recommended Fuse Value: 60A

Recommended Fuse Type: AFS, AGU or MaxiFuse™

Input Sections:

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

Input Type: Differential-balancedwith RCA jack inputs

Input Range: Switchable from 200mV - 2V RMS to 800mV - 8V RMS

Channels 1 & 2:

Amplifier Topology: Class A/B with patented Absolute Symmetry™ dual N-ChannelMOSFET output design

Power Supply: Independent, pulse width modulationregulated switching power supply with multistage impedance optimizing circuitry.

Rated Power (Stereo):

150W RMS x 2 @ 1.5-4Ω(11V - 14.5V)

Rated Power (Bridged):

300W RMS x 1 @ 3-8Ω(11V - 14.5V)

THD at Rated Power: <0.03% @ 4Ω per channel (20 Hz-20kHz)

Signal to Noise Ratio: >108.5 dB referred to rated power (A-weighted,20Hz-20kHz noise bandwidth)

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

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

Slew Rate: ± 25V/μs

CH 1&2 Filter: State-variable,12 dB/octave Butterworth or 24 dB/octaveLinkwitz-RileyLow-PassorHigh-Passwith 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 fortri-ampconfigurations. Defeatable.

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.

Channels 3 & 4:

Amplifier Topology: Class A/B with patented Absolute Symmetry™ dual N-ChannelMOSFET output design

Power Supply: Independent, pulse width modulationregulated switching power supply with multistage impedance optimizing circuitry.

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)

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

Slew Rate: ± 25V/μs

Channel 3&4 Filter: State-variable,12 dB/octave Butterworth or 24 dB/octaveLinkwitz-RileyHigh-Passwith continuously variable cutoff frequency from 50 - 500 Hz, switchable to a range of 500 - 5000 Hz, via x10 switch.

Preamp Output:

2-Channelpass-throughtype,switch-selectableto pass signal from CH 1&2 inputs only, from CH 3&4 inputs only or from all four inputs (summed).

Dimensions (LxWxH):

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

Due to ongoing product development, all specifications are subject to change without notice.

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

27

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

 

 

 

Signal From

 

 

 

 

 

Bass EQ

Infrasonic Filter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 & 2 | 3 & 4 | All

 

 

 

 

 

Off | On

 

Off | 30Hz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Either

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

feature

 

450/4v2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

sums the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CH 1&2 input

 

 

 

 

 

 

Left

Right

 

 

 

 

 

signals to

Four-ChannelSystem Amplifier

 

 

 

 

 

150W

(1.5-4Ω)150W

 

 

 

 

 

mono when

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

activated.

 

 

 

Left Output Right Output

Bridged: 300W x 1 (3-8Ω)

 

Remote

 

 

 

 

 

 

 

 

 

Bass Port

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CH 1 & 2 Filter Section

Freq. Range Filter Mode | Slope

 

x1 | x10 Off | 12dB | 24dB

 

95

Filter Type

75

130

60

200

 

50

500 LP | BP | HP

Filter Freq. (Hz)

CH 1 & 2 Input Section

Input Voltage

Input Sens.

 

 

Low | High

 

 

 

 

 

Input Mode

 

 

2ch | 4ch

CH 1

CH 2

1 & 2

1 & 2

Inputs

and

(Left)

(Right)

Only

3 & 4

CH 3 & 4 Filter Section

CH 3 & 4 Input Section

CH 3 & 4 Speaker Outputs

Freq. Range High-PassFilter

Input Voltage Input Sens.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

x1 | x10 Off | 12dB | 24dB

 

Low | High

 

 

95

Also sets

 

 

 

75

130

 

 

 

 

 

low-pass

 

 

 

60

 

cutoff for

 

 

 

200 CH 1 & 2

Left

 

Right

 

 

Bandpass

 

50

500

Filter

75W

(1.5-4Ω)

75W

 

 

(if selected)

 

 

 

HP Filter Freq. (Hz)

CH 3

CH 4

Bridged: 150W x 1 (3-8Ω)

(Left)

(Right)

 

 

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

29

NOTES

NOTES

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

31

LIMITED WARRANTY - AMPLIFIERS (USA)

+- "6%*0 XBSSBOUT UIJT QSPEVDU UP CF GSFF PG EFGFDUT JO NBUFSJBMT BOE XPSLNBOTIJQ GPS B QFSJPE PG ninety (90) days from the original date of purchase. The warranty term is extended to two (2) years if

JOTUBMMBUJPO JT QFSGPSNFE PS BQQSPWFE CZ BO BVUIPSJ[FE +- "6%*0 EFBMFS QSPPG PG JOTUBMMBUJPO PS BQQSPWBM required on purchase receipt).

5IJT XBSSBOUZ JT OPU USBOTGFSSBCMF BOE BQQMJFT POMZ UP UIF PSJHJOBM QVSDIBTFS GSPN BO BVUIPSJ[FE +- "6%*0 EFBMFS 4IPVME TFSWJDF CF OFDFTTBSZ VOEFS UIJT XBSSBOUZ GPS BOZ SFBTPO EVF UP NBOVGBDUVSJOH EFGFDU PS NBMGVODUJPO +- "6%*0 XJMM BU JUT EJTDSFUJPO SFQBJS PS SFQMBDF UIF EFGFDUJWF QSPEVDU XJUI OFX PS SFNBOVGBDUVSFE QSPEVDU BU OP DIBSHF %BNBHF DBVTFE CZ UIF GPMMPXJOH JT OPU DPWFSFE VOEFS XBSSBOUZ accident, misuse, abuse, product modification or neglect, failure to follow installation instructions,

VOBVUIPSJ[FE SFQBJS BUUFNQUT NJTSFQSFTFOUBUJPOT CZ UIF TFMMFS 5IJT XBSSBOUZ EPFT OPU DPWFS JODJEFOUBM or consequential damages and does not cover the cost of removing or reinstalling the unit(s). Cosmetic damage due to accident or normal wear and tear is not covered under warranty.

Warranty is void if the product’s serial number has been removed or defaced.

Any applicable implied warranties are limited in duration to the period of the express warranty as provided herein beginning with the date of the original purchase at retail, and no warranties, whether express or implied, shall apply to this product thereafter. Some states do not allow limitations on implied warranties, therefore these exclusions may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

If you need service on your JL AUDIO product:

"MM XBSSBOUZ SFUVSOT TIPVME CF TFOU UP +- "6%*0 T "NQMJGJFS 4FSWJDF 'BDJMJUZ GSFJHIU QSFQBJE UISPVHI BO BVUIPSJ[FE +- "6%*0 EFBMFS BOE NVTU CF BDDPNQBOJFE CZ QSPPG PG QVSDIBTF B DPQZ PG UIF PSJHJOBM TBMFT SFDFJQU %JSFDU SFUVSOT GSPN DPOTVNFST PS OPO BVUIPSJ[FE EFBMFST XJMM CF SFGVTFE VOMFTT TQFDJGJDBMMZ BVUIPSJ[FE CZ +- "6%*0 XJUI B WBMJE SFUVSO BVUIPSJ[BUJPO OVNCFS

Warranty expiration on products returned without proof of purchase will be determined from the manufacturing date code. Coverage may be invalidated as this date is previous to purchase date. Nondefective items received will be returned freight-collect.Customer is responsible for shipping charges and

JOTVSBODF JO TFOEJOH UIF QSPEVDU UP +- "6%*0 'SFJHIU EBNBHF PO SFUVSOT JT OPU DPWFSFE VOEFS XBSSBOUZ

For Service Information in the U.S.A. please call JL Audio Customer Service: (954) 443-1100 9:00 AM – 5:30 PM (Eastern Time Zone)

JL Audio, Inc

10369 North Commerce Pkwy.

Miramar, FL 33025

(do not send product for repair to this address)

International Warranties:

Products purchased outside the United States of America are covered only by that country’s distributor and not by JL Audio, Inc.

Absolute Symmetry™ Class A/B Amplifier Circuit is covered by U.S. Patent #6,294,959 and is pending in the countries listed below. Austria, Belgium, Brazil, Canada, China, France, Germany, Indonesia, Italy, Japan, Republic of Korea, Mexico, Netherlands, Norway, Russian Federation, Singapore, Sweden, Switzerland, United Kingdom, and all other PCT countries.

450/4v2MAN-CH-03-2007