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OWNER’S MANUAL
four-channel system amplifier
Thank you for purchasing a JL Audio amplifier for
your automotive sound system.
Your amplifier has been designed and manufactured to exacting
standards in order to ensure years of musical enjoyment in your vehicle.
For maximum performance and extended warranty
coverage, we highly recommend that you have your new amplifier
installed by an authorized JL Audio dealer. Your authorized
dealer has the training, expertise and installation equipmen
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PROTECT YOUR HEARING! INSTALLATION APPLICATIONS Cooling Efficiency Considerations: We value you as a long-term customer. For This amplifier is designed for operation in Your JL Audio amplifier employs an If mounting the amplifier under a seat, that reason, we urge you to practice restraint in vehicles with 12V, negative-ground electrical advanced type of heat management, called make sure there is at least 1 inch (2.5 cm) of the operation of this product so as not to damage systems. Use of t
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PRODUCT DESCRIPTION TYPICAL INSTALLATION SEQUENCE The JL Audio 450/4v2 is a four-channel system The 450/4v2’s flexible input and crossover The following represents the sequence for 7) Securely mount the amplifier using sections permit operation with a wide variety a typical amplifier installation, using an appropriate hardware. Class AB technology for all channels. All of source units and system configurations. The aftermarket source unit or OEM Interface 8) Connect the p
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POWER CONNECTIONS TURN-ON LEAD Before installing the amplifier, The ground connection should be made using The 450/4v2 uses a conventional +12V remote CH 1&2 Input Section disconnect the negative (ground) wire the same gauge wire as the power connection turn-on lead, typically controlled by the source Input Mode from the vehicle’s battery. This will prevent (4 AWG) and should be kept as short as possible, unit’s remote turn-on output. The amplifier will all four amplifier channels
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IMPORTANT ! CROSSOVER CONTROLS CH 3&4 Filter Section: The output of the amplifier will decrease for Crossovers are groups of individual electronic 2) Filter Mode/Slope CH 3 & 4 Filter Section CH 3 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-Pass Filter Inpu Range” switch is placed in the “High” ranges to pass through them by attenuating from two filter slopes. x1 | x10 Off | 12dB | 24
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SPEAKER OUTPUTS 3) Filter Freq. (Hz) 3) ALL 1) Infrasonic Filter The 450/4v2 employs JL Audio’s exclusive markings surrounding this rotary control CH 1&2 Input Section 24 dB/octave high-pass filter, with a fixed Regulated, Intelligent Power Supply (R.I.P.S.) are for reference purposes and are generally CH 3&4 Input Section 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 indepe
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IMPORTANT ! BRIDGING CONSIDERATIONS STATUS INDICATOR LIGHTS / SERVICING YOUR JL AUDIO AMPLIFIER If you connect a load higher than 4Ω nominal Bridging is the practice of combining the PROTECTION CIRCUITRY If your amplifier fails or malfunctions, please per channel in stereo mode (or 8Ω in bridged output of two amplifier channels to drive a single There are three status indicator lights on the mode), power will drop by half with every load. When bridged, each channel produce
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SYSTEM CONFIGURATIONS The 450/4v2 is a very flexible amplifier, well- B) Fade Subwoofer Level vs. HF Level Crossover Setup for Bi-Amplified System The separate amplifier will drive the subwoofer suited for a multitude of system configurations. R e q uir e d : a source unit or processor with front with one 450/4v2: system with low-pass filtering (select a filter In this section, the most likely configurations are and rear pairs of outputs. explained in detail. I np ut C o n n e c t i on s : t
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C) Fade HF Front to Rear with Non-Fading E) Front to Rear HF Fading and After proper adjustment of the 450/4v2’s CH Input connection options for bi-amplified 3.1 Subwoofer Level Subwoofer Level Control 1&2 and CH 3&4, and the subwoofer amplifier’s system with one 450/4v2 and a separate subwoofer R e q uir e d : a source unit or processor with front R e q uir e d: a source unit or processor with Input Range Input Sens. amplifier: and rear pairs of stereo outputs. front and rear pair
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IMPORTANT ! The “Summed Center Channel” methods D) Fade Between “Summed Center Channel” Crossover setup for bi-amplified 3.1 system with Bi-Amplified 5.1 System with outlined below do not create a true center Level and Left/Right Level with Separate one 450/4v2 and a separate subwoofer amplifier: Multi-Channel Source, one 450/4v2 in channel, they simply sum left and right signals Subwoofer Level Control three-channel mode, a JL Audio 300/2 to the center speaker system. This is not as R e
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TRI-AMPLIFIED SYSTEMS Tri-amplified systems are defined as systems Input connection options for the Tri-Amplified C) Subwoofer Level Control Only Crossover setup for tri-amplified 3.1 system with in which separate amplifier channels drive Stereo mode are as follows: R e q uir e d: a source unit or processor one 450/4v2 and a separate subwoofer amplifier: low-frequency (LF), mid-frequency (MF) and with left, right and dedicated high-frequency (HF) speakers and are separately A) No User Adjustab
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APPENDIX A: APPENDIX B: Precise Frequency Selection Chart Input Sensitivity Level Setting 3) Input Voltage Low 8) Input Sens Input Sens. the target voltage is delivered for that set “FILTER FREQ” CH 1&2 / CH 3&4 APPENDIX A: channels all the way down. of channels. If excessive voltage is read Detent Panel Actual Input Sensitivity Level Setting 4) Set the source unit volume to 3/4 of full on either set of channels with the control Number Marking Freq. volume
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APPENDIX C: TROUBLE SHOOTING “How do I properly set the input sensitivity on my amplifier” “My amplifier shuts off once in a while, usually at higher volumes” Please re fer to Appendix B (page 22) to set the input sensitivity for Check you r voltage source and grounding point. The power supply maximum, low-distortion output. of the 450/4v2 will operate with charging system voltages “My amplifier doesn’t turn on” down to 10V. Shutdown problems at higher volume levels Check t he fuse, not j
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APPENDIX D: 450/4v2 Specifications General Specifications: Channels 3 & 4: Recommended Fuse Value: 60A Amplifier Topology: Class A/B with patented Absolute Recommended Fuse Type: AFS, AGU or MaxiFuse™ Symmetry™ dual N-Channel MOSFET output design Power Supply: Independent, pulse width modulation- Input Sections: regulated switching power supply with multistage No. of Inputs: Two Stereo Pairs (CH 1&2, CH 3&4) impedance optimizing circuitry. Input Type: Differential-balanced with RCA jack i
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INSTALLATION NOTES: Use this diagram to document your amplifier’s switch and control positions. +12VDC Ground Remote Preamp Output Section CH 1 & 2 Speaker Outputs CH 1 & 2 Bass Control CH 1 & 2 Filter Section CH 1 & 2 Input Section CH 3 & 4 Filter Section CH 3 & 4 Input Section CH 3 & 4 Speaker Outputs Signal From Bass EQ Infrasonic Filter Freq. Range Filter Mode | Slope Input Voltage Input Sens. Freq. Range High-Pass Filter Input Voltage Input Sens. | | | | | | | | | | | | 1 & 2 3 & 4 All Of
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NOTES NOTES 30 | JL Audio - 450/4v2 Owner’s Manual 31
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LIMITED WARRANTY - AMPLIFIERS (USA) ninety (90) days from the original date of purchase. The warranty term is extended to two (2) years if required on purchase receipt). accident, misuse, abuse, product modification or neglect, failure to follow installation instructions, or consequential damages and does not cover the cost of removing or reinstalling the unit(s). Cosmetic damage
