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owner’s manual
320W 4-Channel, Full-Range 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 perfor
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Prote Ct Your Hearing! installation aPP liC ations Planning Your installation We value you as a long-term customer. For This amplifier is designed for operation in It is important that you take the time to read Mounting the amplifier upside down is that reason, we urge you to practice restraint in vehicles with 12 volt, negative-ground electrical this manual and that you plan out your strongly discouraged. the operation of this product so as not to damage systems. Use of this product in vehi
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Produ Ct d esCri Ption Power Conne Ctions The JL Audio J2-320.4 is a four-channel, full- 5) Run speaker cables from the speaker systems Before installing the amplifier, disconnect the Any wires run through metal barriers (such as range audio amplifier utilizing to the amplifier mounting location. negative (ground) wire from the vehicle’s battery. firewalls), must be protected with a high quality Class B technology for all channels. 6) F ind a good, solid metal grounding point This will preve
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t urn- o n l ead The J2-320.4 is turned on and off 1) L ow-Level Inputs: A standard left/ Make sure you observe correct polarity in If you wish to feed all four channels by using using a conventional +12V remote turn- right pair of RCA type jacks in the making the “High Level Input” connections. only two channels of input, set the “CH 3&4 on lead, typically controlled by the “Amplifier Inputs” section is used for Failure to do so will reduce bass and affect Input From” switch to “1&2” and us
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Filter Controls “bass bo ost” Controls The active filter built into each channel attenuate frequencies above the selected filter Each channel pair of the J2-320.4 includes a The preamp output signal is not affected by the section of the J2-320.4 can be used to eliminate frequency at a rate of 12dB per octave. This is single band, boost-only bass equalizer controlled “Bass Boost” processing selected for the amplifier potentially harmful and/or undesired frequencies useful for connection of subw
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bridging Considerations am Pli Fier s tatus indiC ator l ig Hts & s ervi Cing Your tma a mPli Fier Bridging is the practice of combining the 1) Left Channel Only or Right Channel Only Prote Ction CirC uitr Y If your amplifier fails or malfunctions, please output of two amplifier channels to drive a single Information: If you wish to send a left-only There are two status indicator lights on the return it to your authorized JL Audio dealer so load. When bridged, each channel produces or right
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aPPendix a : aPPendix b: input s ensitivity l evel s etting 8) Increase the “Input Sens.” control until the J2-320.4 s pecifications Following the directions below will allow the target voltage is observed with the voltmeter. installer to adjust the input sensitivity of each 9) Once you have adjusted the amplifier to g eneral s pecifications: amplifier channel pair simply and easily in just a its maximum low-distortion output level, Recommended Fuse Value: 60A few minutes using equipment whic
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aPP endix C: troubles Hooting “How do i properly set the input sensitivity on my amplifier” “my amplifier turns on, but there is no output” Please r efer to Appeaset the input sensitivity for maximum, low- Check t he input signal using an AC voltmeter to measure the distortion output. voltage from the source unit while an appropriate test tone is “my amplifier doesn’t turn on” played through the source unit (disconnect the input cables Check t he fuse, not just visually, but with a continu
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installation notes : Use this diagram to document your amplifier’s switch and control positions. Channel 1 & 2 Controls Pre-Outs Amplifier Inputs Channel 3 & 4 Controls Power CH 3&4 Protect Input From LEFT CH 1 (Left) CH 3 (Left) Bass Boost Bass Boost | 1&2 3&4 High-Level Inputs High-Level Inputs Off +12dB Off +12dB 40 150 60 1.2k min max min max 60 1.2k 40 150 Low-Pass High-Pass High-Pass Low-Pass | | HP Off LP HP | Off | LP Filter Mode RIGHT CH 2 (Right) CH 4 (Right) Input Sens. Filter Freq
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installation notes : installation notes : 18 JL Audio 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 one (1) year from the original date of purchase. 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
