APPENDIX D: TROUBLE SHOOTING

“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, inspect the fuse-holder.

Check the integrity of the connections made to each of the “+12VDC”, “Ground”, and “Remote” terminals. Ensure that no wire insulation is pinched by the terminal set screw and that each connection is tight.

Check to make sure there is +12V at the “Remote” connection of the amplifier. In some cases, the turn-on lead from the source unit is insufficient to turn on multiple devices and the use of a relay is required. To test for this problem, jump the “+12VDC” wire to the “Remote” terminal to see if the amplifier turns on. If this does not work, proceed to the next step.

“I get a distorted / attenuated sound coming out of the speaker(s)”

Check the speaker wires for a possible short, either between the positive and negative leads or between either speaker lead and the vehicle’s chassis ground. If a short is present, you will experience distorted and/or attenuated output. The “Protect” light will illuminate in this situation. It may be helpful to disconnect the speaker wires from the amplifier and use a different set of wires connected to a test speaker.

Check the nominal load impedance to verify that of the amplifier is driving a load equal to or greater than 2 ohms.

Check the input signal and input signal cables to make sure signal is present at the “Amplifier Inputs” and the cables are not pinched or loose. It may be helpful to try a different set of cables and/or a different signal source to be sure.

“My amplifier’s output fluctuates when I tap on it or hit a bump”

Check the connections to the amplifier. Make sure that the insulation for all wires has been stripped back far enough to allow a good contact area inside the terminal block.

Check the input connectors to ensure that they all are making good contact with the input jacks on the amplifier.

“My amplifier shuts off once in a while, usually at higher volumes”

Check your voltage source and grounding point. The power supply of the A1400 will operate with charging system voltages down to 10V. Shutdown problems at higher volume levels can occur when the charging system voltage 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, inspect all wiring and termination points. It may also be necessary to upgrade the ground wire connecting the battery to the vehicle’s chassis and the power wire connecting the alternator to the battery. Many vehicles employ small (10 AWG - 6 AWG) wire to ground the battery to the vehicle’s chassis and to connect the alternator to the battery. To prevent voltage drops, these wires should be upgraded to 4 AWG when installing amplifier systems with main fuse ratings above 60A. Grounding problems are the leading cause of misdiagnosed amplifier “failures.”

“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 0.2 and 8.0-volts) should be present at the output of the signal cables.

Check the output of the amplifier. Using the procedure explained in the previous check item (after plugging the input cables back into the amplifier) test for output at the speaker outputs of the amplifier. Unless you enjoy test tones at high levels, it is a good idea to remove the speaker wires from the amplifier while doing this. Turn the volume up approximately half way. 5V or more should be measured at the speaker outputs. This output level can vary greatly between amplifiers but it should not be in the millivolt range with the source unit at half volume. If you are reading sufficient voltage, check your speaker connections as explained below.

Check to ensure that the speaker wires are making a good connection with the metal inside the terminal block. The speaker wire connectors are designed to accept up to 8 AWG wire. Make sure to strip the wire to allow for a sufficient connection with the metal inside the terminal block.

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JL AUDIO A1400

JL AUDIO A1400

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JL Audio A1400 owner manual Appendix D Trouble Shooting, How do I properly set the input sensitivity on my amplifier
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A1400 specifications

The JL Audio A1400 is a powerful multi-channel amplifier designed to meet the demanding requirements of car audio enthusiasts. Renowned for its exceptional performance and quality, the A1400 is a prime choice for those seeking to enhance their automotive sound experience.

One of the standout features of the A1400 is its Class D amplifier technology. This design not only ensures high efficiency, allowing the amplifier to produce more power without generating excessive heat, but it also reduces the overall weight of the unit. The A1400 is capable of delivering 1400 watts of peak power, making it suitable for driving multiple speakers with ease, whether they are part of a full-range setup or a dedicated subwoofer stage.

The amplifier offers a fully flexible configuration, supporting 4-channel output, which enables users to run it in several different modes: 4-channel, 3-channel, or bridging it to a 2-channel operation for increased power to a pair of subwoofers. This versatility makes the A1400 adaptable for various audio setups, whether it's powering front and rear speakers or providing a rich low-frequency response.

In addition to its powerful output, the A1400 includes advanced technologies like differential balanced inputs, allowing for a clean signal transfer and reduced noise interference from external sources. This feature is particularly beneficial in automotive environments where electronic noise can impact sound quality.

The amplifier also comes equipped with a variable crossover network, enabling users to tailor the audio output to their specific needs. With this functionality, users can adjust the crossover frequency to ensure that each speaker is receiving the appropriate range of frequencies for optimal sound clarity and performance.

Aesthetic considerations have not been overlooked; the JL Audio A1400 is housed in a sleek aluminum and steel chassis designed for durability while also promoting effective heat dissipation. The illuminated JL Audio logo adds a touch of style, making this amplifier visually appealing.

With its outstanding power delivery, flexible configurations, and sophisticated features, the JL Audio A1400 stands out as a reliable and high-performance option for anyone looking to elevate their car audio experience. Whether you're an audiophile or just stepping into the world of high-quality sound systems, the A1400 promises to deliver an audio experience that is both immersive and exhilarating.
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