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owner’s manual
400W 2/3/4 Channel 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, 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 fr
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Protect Your Hearing! installation aPP lications We value you as a long-term customer. For This amplifier is designed for operation in that reason, we urge you to practice restraint in vehicles with 12 volt, negative-ground electrical the operation of this product so as not to damage systems. Use of this product in vehicles with your hearing and that of others in your vehicle. positive ground and/or voltages other than 12V Studies have shown that continuous exposure to may result in damage t
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ENGLISH Planning Your installation It is important that you take the time to read this manual and that you plan out your Mounting the amplifier upside down is installation carefully. The following are some strongly discouraged. If mounting the amplifier considerations that you must take into account under a seat, make sure there is at least 1 inch when planning your installation. (2.5 cm) of space above the amplifier’s outer shell to permit proper cooling. c ooling efficiency c onsidera
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Product d escri Ption The JL Audio XD400/4 is a four-channel, 6) Find a good, solid metal grounding full-range audio amplifier utilizing JL Audio point close to the amplifier and connect NexD™ ultra-high speed switching technology to the negative power wire to it using deliver outstanding fidelity and efficiency. appropriate hardware (use of the JL Audio The XD400/4 can be operated with a wide ECS master ground lug, XB-MGLU is variety of source units and system configurations. recommende
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ENGLISH Power c onnections Before installing the amplifier, disconnect the The ground connection should be made negative (ground) wire from the vehicle’s battery. using 8 or 4 AWG wire and should be kept This will prevent accidental damage to the system, as short as possible, while accessing a solid the vehicle and your body during installation. piece of sheet metal in the vehicle. The surface of the sheet metal should be sanded at the contact point to create a clean, metal- to-metal conne
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t urn- o n l ead inPut s ection The XD400/4 uses a conventional +12V remote The XD400/4’s input section allows you to turn-on lead, typically controlled by the source send signals to the amplifier section through the unit's remote turn-on output. The amplifier will use of two or four differential-balanced inputs. turn on when +12V is present at its “Remote” Input connections are via up to two pairs of input and turn off when +12V is switched off. If traditional RCA-type jacks. a source unit d
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ENGLISH in Put s ensiti Vit Y c ontrols The controls labeled “Input Sens.” located in each channel section can be used to match the source unit’s output voltage to the input stage of each pair of amplifier channels for maximum clean output. Rotating the control clockwise will result in higher sensitivity (louder for a given input voltage). Rotating the control counter- clockwise will result in lower sensitivity (quieter for a given input voltage.) To properly set the amplifier for ma
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Filter c ontrols Most speakers are not designed to reproduce types or defeated completely by way of the the full range of frequencies audible by the human three-position “Filter Mode” switches: ear. For this reason, most speaker systems are “Off”: Defeats the filter completely, allowing comprised of multiple speakers, each dedicated the full range of frequencies present at the to reproducing a specific frequency range. Filters inputs to feed the amplifier. This is useful for are used to se
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ENGLISH r emote l eVel control ( oP tional) Pre outs The XD400/4 incorporates a pass-through preamp output section, so that additional amplifiers can be easily added to the system. This pass-through pre-amp output can be configured two different ways using the switch labeled “Preouts From”. 1) “1&2”: The preamp output delivers the same With the addition of the optional Remote signal that is connected to the CH 1&2 Inputs. Level Control (HD-RLC), you can control the This mode is usefu
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sPeaker outP uts “Left –” and “Right +” remain unused). When The XD400/4’s speaker outputs are designed bridged, each channel will deliver optimum to accept 16 AWG - 8 AWG wire. To connect the power into a 4 ohm load. speaker wires to the amplifier, first back out the set screws on the top of the terminal block, using the supplied 2.5 mm hex wrench. Strip 1/2 inch When a pair of channels are bridged, they (12 mm) of insulation from the end of each wire will deliver 200W x 1 into a 4 ohm l
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ENGLISH s tatus led / Protection circuitr Y There is a single multi-color LED on the top 5) LED off / Amplifier Shuts Off Unexpectedly surface of the amplifier to indicate the amplifier’s The only condition that will shut down operating status. an undamaged XD400/4 completely is if battery voltage or remote turn-on voltage drops below 10 volts. The “Status LED” will turn off when this occurs. The amplifier will turn back on when voltage climbs back above 11 volts. If this is happening in
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sYstem conF igurations The XD400/4 is a flexible amplifier, well- Inp ut Connections: the first stereo pair of source suited for a multitude of system configurations. unit outputs is connected to the “CH 1 (Left)” In this section, the most likely configurations for and “CH 2 (Right)” inputs of the XD400/4. a system with a single XD400/4 are explained in The second stereo pair of source unit outputs detail. is connected to the “CH 3 (Left)” and “CH 4 Once you have selected your desired (Righ
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ENGLISH 14), you can fine tune filter frequencies and B) Subwoofer Level Control Only: attenuate either pair of channels to achieve Requ ired: a source unit or processor with left, proper balance. For precise filter frequency right and dedicated subwoofer outputs. information refer to Appendix B (page 15). Inp ut Connections: The main stereo pair of source unit outputs is connected to the multi- a mPliF ier s Ystems “CH 1 (Left)” and “CH 2 (Right)” inputs of Using the “Preamp Outputs” of
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aPPendi X a : input s ensitivity l evel s etting 9) O nce you have adjusted the XD400/4 to Following the directions below will allow the its maximum low-distortion output level, installer to adjust the input sensitivity of each reconnect the speaker(s). The “Input Sens.” amplifier channel pair simply and easily in just a controls can now be adjusted downward if the few minutes using equipment which is commonly amplifier requires attenuation to achieve the available in installation bays. des
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ENGLISH aPP endi X b: aPPendi X c : Precise Frequency selection c hart Xd 400/4 s pecifications “Filter Freq ” g eneral s pecifications: detent Panel a ctual Recommended Fuse Value: 40A number marking Freq. Recommended Fuse Type: MAXI® or AGU Full counter-clockwise: 49 01 ............................49 02 ........... “50”............49 input s ections: 03 ............................50 No. of Inputs: Two Stereo Pairs 04 ............................50 Input Type: Differential-balanc
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aPP endi X d: troubles Hooting “How do i properly set the input sensitivity on my amplifier?” Please r efer to Appendix A (page 14) to set the input sensitivity for maximum, low-distortion output. “my amplifier doesn’t turn on.” Check t he 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
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ENGLISH “my amplifier shuts off once in a while, usually at higher volumes.” Check y our voltage source and grounding point. The power supply of the XD400/4 will operate with charging system voltages down to 10V. Shutdown problems at higher volume levels can occur when the charging system voltage (or remote turn- on voltage) momentarily drops below 10V. These dips can be of very short duration making them extremely difficult to detect with a common DC voltmeter. To ensure proper voltage,
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installation notes : Use this diagram to document your amplifier’s switch and control positions. 18 | JL Audio - XD400/4 Owner’s Manual
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ENGLISH 19
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l imited w arrant Y - a mPli Fiers ( 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 warrant
