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owner’s manual
250W Monoblock Subwoofer 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 performa
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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 12V, 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 to th
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! IMPORTANT Planning Your installation It is important that you take the time to read Mounting the amplifier upside down is this manual and that you plan out your strongly discouraged. installation carefully. The following are some considerations that you must take into account If mounting the amplifier under a seat, when planning your installation. make sure there is at least 1 inch (2.5 cm) of space above the amplifier’s outer shell to permit c ooling efficiency c onsiderations:
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tYP ical installation s equence The following represents the sequence 7) Securely mount the amplifier using for a typical amplifier installation, using an appropriate hardware. aftermarket source unit or OEM Interface 8) C onnect the positive and negative power product. Additional steps and different wires to the amplifier. procedures may be required in some applications. 9) Connect the remote turn-on wire If you have any questions, please contact your to the amplifier. authorized
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Power c onnections Before installing the amplifier, disconnect the Any wires run through metal barriers (such as negative (ground) wire from the vehicle’s battery. firewalls), must be protected with a high quality This will prevent accidental damage to the system, insulating grommet to prevent damage to the the vehicle and your person during installation. insulation of the wire. Failure to do so may result in a dangerous short circuit. Ground Remote + VDC FUSE Speaker Output (Mono) ! IM
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“rem ote” turn- on “am Pli Fier in Put s” The J2-250.1 is turned on and off The J2-250.1 offers two input connection using a conventional +12V remote turn- methods, one for high-level (speaker level) signals on lead, typically controlled by the and one for low-level (preamp level) signals. source unit’s remote turn-on output. Preamp Amplifier Outputs Inputs Ground Remote + VDC FUSE Speaker Output (Mono) LEFT LEFT 30A High-Level Inputs Power Protect Remote Level Port min max 60 240 O +9dB M
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IMPORTANT ! “in Put sensiti Vit Y” (gain ) ad Justment Make sure you observe correct polarity in Located next to the input connectors is a rotary making the “High-Level Input” connections. control labeled “Input Sens.”. This rotary control Failure to do so will result in a complete loss of can be used to match the source unit’s output signal (no bass). voltage to the input stage of the amplifier for maximum clean output. The connections for the “High-Level Inputs” plug wires are as follo
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“l P Filter ” (cro sso Ver ) c ontrol “Prea mP outP uts ” The J2-250.1 employs a 12dB/octave low-pass The J2-250.1 incorporates a preamp output (LP) active filter for its internal channel. This section, designed to make multiple amplifier feature is designed to attenuate frequencies above systems easy to set up. This section consists its filter frequency, so that the system’s subwoofers of a pair of RCA-type jacks marked do not reproduce any audible midrange content. “Preamp Outputs”. The l
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“bass bo ost” c ontrol remote le Vel c ontrol The J2-250.1 includes a single band, boost- The J2-250.1 includes a remote level control only bass equalizer controlled by a rotary knob that can be mounted in the front of the vehicle. marked “Bass Boost”. This control has a boost This control allows the owner to adjust the overall range of 0dB (full-counterclockwise) to +9dB subwoofer level to taste. To connect the remote (full-clockwise) and is centered at 45 Hz. bass control knob, insert its
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! IMPORTANT s Pea Ker outP ut Speaker connection to the J2-250.1 is Do NOT attempt to “bridge” two J2-250.1’s straightforward and takes place at the far together or combine their output to a single right of the power/speaker connection load in any manner. Doing so will damage the panel. Two positive (“+”) connections and amplifier(s). two negative (“–”) connections are available via a connector labeled “Speaker Output ! IMPORTANT (Mono)”. The dual connections allow for two separate spea
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status indicator l ig Hts / s er Vicing Your a mPliF ier Protection c ircuitr Y If your amplifier fails or malfunctions, please There are two status indicator lights on the return it to your authorized JL Audio dealer so amplifier’s control panel. These are as follows: that it may be sent in to JL Audio for service. There are no user serviceable parts or fuses inside 1) “ Power” (Green): Located at the far left of the the amplifier. The unique nature of the circuitry amplifier’s control p
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aPPendix a : input s ensitivity l evel s etting 8) Increase the “Input Sens.” control until the 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 amplifier channel pair simply and easily in just a its maximum low-distortion output level, few minutes using equipment which is commonly reconnect the speaker(s). The “Input Sens.” available in installation bays
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aPPendix b: J2-250.1 specifications g eneral s pecifications: Recommended Fuse Value: 30A Recommended Fuse Type: ANL at battery, 1x 30A ATC fuses on amplifier chassis. input section: Low-Level Input: Single-ended with RCA jacks Low-Level Input Range: 200mV - 4V RMS High-Level Input: Single-ended with molded connector High-Level Input Range: 630mV - 20.5V RMS a mplifier s ection: Amplifier Topology: Class A/B Monaural with Dual N-Channel MOSFET output stage Power Supply: PWM switching type
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aPPendix c: troublesHooting “How do i properly set the input sensitivity on my amplifier” Please refer to Appendix A (page 12) to set the input sensitivity for maximum, low-distortion output. “my amplifier doesn’t turn on” Check the 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, ins
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“my amplifier turns on, but there is no output” Check the input signal using an AC voltmeter to measure the voltage from the source unit 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 the amplifier (example: 50 Hz for a sub bass application or 1 kHz for a full range / high-pass application). A steady, sufficient voltage (between 0.
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installation notes : Use this diagram to document your amplifier’s switch and control positions. Preamp Amplifier Outputs Inputs LEFT LEFT High-Level Inputs Power Protect Remote Level Port min max 60 240 O +9dB Input Sens. LP Filter Frequency (Hz) Bass Boost RIGHT RIGHT 16 JL Audio
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Preamp Amplifier Outputs Inputs LEFT LEFT High-Level Inputs Power Protect Remote Level Port min max 60 240 O +9dB Input Sens. LP Filter Frequency (Hz) Bass Boost RIGHT RIGHT 17
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installation notes : 18 JL Audio
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installation notes : 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
