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LIMITED WARRANTY - AMPLIFIERS (USA)

JL AUDIO warrants this product to be free of defects in materials and workmanship for a period of ninety

(90) days from the original date of purchase. The warranty term is extended to two (2) years if installation is

performed or approved by an authorized JL AUDIO dealer (proof of installation or approval required on

purchase receipt).

This warranty is not transferrable and applies only to the original purchaser from an authorized JL AUDIO

dealer. Should service be necessary under this warranty for any reason due to manufacturing defect or

malfunction, JL AUDIO will (at its discretion), repair or replace the defective product with new or remanufactured

product at no charge. Damage caused by the following is not covered under warranty: accident, misuse, abuse,

product modification or neglect, failure to follow installation instructions, unauthorized repair attempts,

misrepresentations by the seller.This warranty does not cover incidental 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:

All warranty returns should be sent to JL AUDIO ’s Amplifier Service Facility freight-prepaid through an

authorized JL AUDIO dealer and must be accompanied by proof of purchase (a copy of the original sales receipt).

Direct returns from consumers or non-authorized dealers will be refused unless specifically authorized by 

JL AUDIO with a valid return authorization number.

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. Non-defective

items received will be returned freight-collect. Customer is responsible for shipping charges and insurance in

sending the product to JL  AUDIO. Freight damage on returns is not covered under warranty.

For Service Information in the U.S.A. please call:

JL Audio customer service: (954) 443-1100 

during normal business hours (9:00 AM – 5:30 PM Eastern Time)

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.

JL4504MAN-CH-10-2002-Rev1

Absolute Symmetry

Class AB 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.

Summary of Contents for 450/4

Page 1: ... 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...

Page 2: ... equipment air bags seat belt systems ABS brake systems etc You should also take the time to securely mount the amplifier using the supplied screws so that it does not come loose in the event of a collision or a sudden jolt to the vehicle 20 lbs of aluminum traveling at 60 MPH will hurt you Stupid Mistakes to Avoid Check before drilling any holes in your vehicle to make sure that you will not be d...

Page 3: ... 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 4 can be operated in the following modes 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 mai...

Page 4: ...4 s Remote turn on connector 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 wir...

Page 5: ...mited to 0 or 6 dB allowing a range of 0 15 dB of boost to be selected 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 IMPORTANT JL AUDIO 450 4 9 24dB Configures the filter for CH1 2 to attenuate frequencies abo...

Page 6: ...up of the amplifier not covered in this manual please contact your dealer or the JL AUDIO Technical Department for assistance 954 443 1100 9 00 AM 5 30 PM Eastern Time Monday Friday JL AUDIO 450 4 11 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...

Page 7: ... 4 13 SYSTEM CONFIGURATIONS The 450 4 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 BI AMPLIFIED SYSTEMS Bi ...

Page 8: ...mp outputs are not used JL AUDIO 450 4 15 outputs is connected to the CH 1 2 inputs of the 450 4 select 2ch on the Input Mode switch in the CH 1 2 Input Section The second stereo pair of source unit outputs is connected to the subwoofer amplifier inputs In this mode the 450 4 s preamp output is not used Result with this option the user has the ability to fade the level of the subwoofer amplifier s...

Page 9: ...ls are unused User adjustability of left center and right channels depends on source unit processor Subwoofer level is user adjustable 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 The Summed Center Channel methods outlined below do not create a true center chan...

Page 10: ... a subwoofer system from one or more amplifiers or channels LFchannels mid range speakers from a separate amplifier or set of channels MFchannels and high frequency speakers from a separate amplifier or set of channels HFchannels One such configuration is to run subwoofers off the LFchannel s mid bass speakers off the MF channels and a passively crossed over mid high frequency component speaker sy...

Page 11: ...ult in audible distortion and possible speaker damage It will be necessary to re adjust the Input Sens for the affected channels if any equalizer boost is activated after setting the Input Sens with this procedure This applies to any EQ boost circuit including the amplifier s Bass EQ and source unit tone controls or EQ circuits EQ cuts will not require re adjustment IMPORTANT JL AUDIO 450 4 21 CHA...

Page 12: ...LY SETTHE INPUT SENSITIVITY ON MY AMPLIFIER Please refer to Appendix B page 20 to set the input sensitivity for maximum unclipped output MY AMPLIFIER DOESN TTURN ON 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 ...

Page 13: ...e as a bandpass filter for tri amp configurations 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 30Hz defeatable CHANNELS 3 4 Amplifier Topology Class AB with patented Absolute Symmetry dual N Channel MOSFET output design Power Supply Independe...

Page 14: ...JL AUDIO 450 4 27 26 JL AUDIO 450 4 INSTALLATION NOTES Use this diagram to document your amplifier s switch and control positions ...

Page 15: ...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 All warranty returns should be sent to JL AUDIO s Amplifier Service Facility freight prepaid through an authorized JL AUDIO dealer and must be accompanied by proof of purchase a copy of the origi...

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