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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 two (2) years. The warranty is extended to three (3) years total if installation is performed by an 
authorized JL Audio dealer using a JL Audio Premium Power Connection System for power wiring.

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  

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.

Printed in China

 

XD400/4v2 MAN-09-2013

Summary of Contents for XD 400/4v2

Page 1: ...allation 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 to familiarize yourself with...

Page 2: ...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 operatio...

Page 3: ...ventilated environment and in a manner which does not interfere with your vehicle s safety equipment air bags seat belt systems ABS brake systems etc You should also take the time to securely mount th...

Page 4: ...eaker 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 of the JL Aud...

Page 5: ...the set screw firmly taking care not to strip the head of the screw The ground connection should be made using 8 or 4 AWG wire and should be kept as short as possible while accessing a solid piece of...

Page 6: ...ventional 12 V turn on leads Depending on the characteristics of the audio signal one of the following methods may work better than the other We recommend trying DC Offset Sensing first as it does not...

Page 7: ...ts an input sensitivity range between 800mV and 8V This is useful for certain high output preamp level signals as well as speaker level output from source units and small amplifiers To use speaker lev...

Page 8: ...audio system Input Mode 2 Ch 4 Ch All 3 4 1 2 Sum Preouts From Remote Level Mode nal Input Voltage Low High e 1 Filter Mode Controls The XD400 4v2 employs 12dB per octave filters for each pair of cha...

Page 9: ...y added to the system This pass through preamp output can be configured two different ways using the switch labeled Preouts From 1 1 2 the preamp output delivers the same signal that is connected to t...

Page 10: ...put 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 outp...

Page 11: ...ticking or thumping noise in the output Over current conditions can be caused by a speaker impedance lower than the optimum load impedance range for the amplifier or a short circuit in the speaker wi...

Page 12: ...D400 4v2 s Input Sens settings and will not be user adjustable from the front of the vehicle B Fade Subwoofer Level vs HF Level Req uired a source unit or processor with two pairs of stereo outputs In...

Page 13: ...pair of source unit outputs is connected to the subwoofer amplifier inputs Res ult with this option the user has the ability to fade the level of the subwoofer amplifier s input relative to the HF ch...

Page 14: ...input sensitivity adjustment according to the nominal impedance of the speaker system connected to the amplifier outputs 6 Verify that you have disconnected the speakers before proceeding Play a track...

Page 15: ...tio 104 dB referred to rated power A weighted 20 Hz 20 kHz noise bandwidth 84 dB referred to 1W A weighted 20 Hz 20 kHz noise bandwidth Frequency Response 12 Hz 22 kHz 0 1dB Damping Factor 150 4 ohms...

Page 16: ...ay is required To test for this problem jump the 12VDC wire to the Remote terminal to see if the amplifier turns on I get a repetitive ticking or popping sound coming out of the speaker s Check the sp...

Page 17: ...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...

Page 18: ...JL Audio XD400 4v2 Owner s Manual INSTALLATION NOTES Use this diagram to document your amplifier s switch and control positions 4 Channel Amplifier Rem Offset Signal Input Voltage Low High Turn On Mo...

Page 19: ...19...

Page 20: ...etail 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 Thi...

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