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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 equipment to ensure
optimum performance from this product. Should you
decide to install the amplifier yourself, please take the time
to read this manual thoroughly so as to familiarize yourself
with its installation requirements and setup procedures.
If you have any questions regarding the instructions in this
manual or any aspect of your amplifiers operation, please contact your
authorized JL Audio dealer for assistance. If you need further assistance,
please call the JL Audio Technical Support Department
at (954) 443-1100 during business hours.
OWNER’S MANUAL
A4300
four-channel full-range amplifier
1

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  • Page 1

    A4300
    four-channel full-range amplifier

    OWNER’S MANUAL

    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 equipment to ensure
    optimum performance from this product. Should you
    decide to install the amplifier yourself, please take the time
    to read this manual thoroughly so as to familiarize yourself
    with its installation requirements and setup procedures.
    If you have any questions regarding the instructions in this
    manual or any aspect of your amplifier’s operation, please contact your
    authorized JL Audio dealer for assistance. If you need further assistance,
    please call the JL Audio Technical Support Department
    at (954) 443-1100 during business hours.



  • Page 2

    PROTECT YOUR HEARING!
    We value you as a long-term customer. For
    that reason, we urge you to practice restraint in
    the operation of this product so as not to damage
    your hearing and that of others in your vehicle.
    Studies have shown that continuous exposure to
    high sound pressure levels can lead to permanent
    (irreparable) hearing loss. This and all other
    high-power amplifiers are capable of producing
    such high sound pressure levels when connected
    to a speaker system. Please limit your continuous
    exposure to high volume levels.
    While driving, operate your audio system in
    a manner that still allows you to hear necessary
    noises to operate your vehicle safely (horns,
    sirens, etc.).
    SERIAL NUMBER
    In the event that your amplifier requires
    service or is ever stolen, you will need to have
    a record of the product’s serial number. Please
    take the time to enter that number in the space
    provided below. The serial number can be found
    on the bottom panel of the amplifier and on the
    amplifier packaging.

    INSTALLATION APPLICATIONS
    This amplifier is designed for operation in
    vehicles with 12 volt, negative-ground electrical
    systems. Use of this product in vehicles with
    positive ground and/or voltages other than 12V
    may result in damage to the product and will void
    the warranty.
    This product is not certified or approved for
    use in aircraft.
    Do not attempt to “bridge” the outputs of this
    amplifier with the outputs of a second amplifier,
    including an identical one.

    Chassis Ground
    Connector
    (pg. 5)
    +12 V Power
    Remote Turn-On
    Connector
    Connector
    (pg. 4)
    (pg. 5)

    PLANNING YOUR INSTALLATION
    It is important that you take the time to read
    this manual and that you plan out your
    installation carefully. The following are some
    considerations that you must take into account
    when planning your installation.
    Cooling Efficiency Considerations:
    The outer shell of your JL Audio amplifier
    is designed to remove heat from the amplifier
    circuitry. For optimum cooling performance,
    this outer shell should be exposed to as large a
    volume of air as possible. Enclosing the amplifier
    in a small, poorly ventilated chamber can
    lead to excessive heat build-up and degraded
    performance. If an installation calls for an
    enclosure around the amplifier, we recommend
    that this enclosure be ventilated with the aid
    of a fan. In normal applications, fan-cooling
    is not necessary.
    Channels 1 & 2
    Speaker Outputs
    (pg. 8)

    Channels 3 & 4
    Speaker Outputs
    (pg. 8)

    If mounting the amplifier under a seat,
    make sure there is at least 1 inch (2.5 cm) of
    space above the amplifier’s outer shell to permit
    proper cooling.
    Safety Considerations:
    Your amplifier needs to be installed in a dry,
    well-ventilated environment and in a manner
    which does not interfere with your vehicle’s safety
    equipment (air bags, seat belt systems, ABS brake
    systems, etc.). You should also take the time to
    securely mount the amplifier using the supplied
    screws so that it does not come loose in the event
    of a collision or a sudden jolt to the vehicle.
    Stupid Mistakes to Avoid
    • Check before drilling any holes in your vehicle
    to make sure that you will not be drilling
    through a gas tank, brake line, wiring harness or
    other vital vehicle system.
    • Do not run system wiring outside or underneath
    the vehicle. This is an extremely dangerous
    practice which can result in severe damage to
    your vehicle and person.

    Serial Number:

    Input Voltage
    Selection
    (pg. 6)

    • Protect all system wires from sharp metal
    edges and wear by carefully routing them,
    tying them down and using grommets and
    loom where appropriate.

    Power
    Ch. 1 & 2 Filter
    Ch. 1 & 2 Input
    Ch. 3 & 4
    Status
    Frequency
    Sensitivity
    Filter Mode
    Indicator
    Selector
    Control
    Selection
    (pg. 10)
    (pg. 7)
    (pg. 6) Ch. 1 & 2
    (pg. 7)
    Ch. 3 & 4
    Ch. 3 & 4
    Input Sensitivity
    Protection Status
    Channels 3 & 4
    Filter Mode
    Filter Frequency
    Control
    Indicator
    Preamp Input Jacks
    Selection
    Selector
    (pg. 6)
    (pg. 10)
    (pg. 6)
    (pg. 7)
    (pg. 7)

    Channels 1 & 2
    Preamp Input Jacks
    (pg. 6)

    2

    Mounting the amplifier upside down is
    strongly discouraged.

    • Do not mount the amplifier in the engine
    compartment, under the vehicle, on the roof
    or in any other area that will expose the
    amplifier circuitry to the elements.

    Left & Right
    Ch. 3 & 4
    Pre-Out Signal
    Preamp Output
    Bass Boost
    Selection Switch
    Jacks
    On/Off Switch
    (pg. 8)
    Jack for
    Ch. 3 & 4
    (pg. 8)
    (pg. 8)
    Remote Bass
    Input Selection
    Control Knob
    Switch
    (pg. 8)
    (pg. 6)

    JL AUDIO A4300

    JL AUDIO A4300

    3



  • Page 3

    PRODUCT DESCRIPTION
    The JL Audio A4300 is a four-channel,
    full-range audio amplifier utilizing patented
    Absolute Symmetry™ Class A/B technology
    for all channels.
    The A4300 can be operated with a wide variety
    of source units and system configurations.
    TYPICAL INSTALLATION SEQUENCE
    The following represents the sequence
    for a typical amplifier installation, using an
    aftermarket source unit or OEM Interface
    processor (like the CleanSweep CL441dsp).
    Additional steps and different procedures may
    be required in some applications. If you have
    any questions, please contact your authorized
    JL Audio dealer for assistance.
    1) Disconnect the negative battery post
    connection and secure the disconnected cable
    to prevent accidental re-connection during
    installation. This step is not optional.
    2) Run power wire (minimum 8 AWG) from the
    battery location to the amplifier mounting
    location, taking care to route it in such a
    way that it will not be damaged and will not
    interfere with vehicle operation. Use 4 AWG
    or larger power wire and a power distribution
    block if additional amplifiers are being
    installed with the A4300.
    3) Connect power wire to the positive battery
    post. Fuse the wire with an appropriate fuse
    block (and connectors) within 18 inches (45
    cm) wire length of the positive battery post.
    This fuse is essential to protect the vehicle.
    Do not install the fuse until the power wire
    has been securely connected to the amplifier.
    4) Run signal cables and remote turn-on wire
    from the source unit to the final amplifier
    mounting location.
    5) Run speaker cables from the speaker systems
    to the amplifier mounting location.
    6) Find a good, solid metal grounding point
    close to the amplifier and connect the
    negative power wire to it using appropriate
    hardware (use of the JL Audio ECS master
    ground lug, XA-MGL-1 is recommended).
    Use the same size power wire as the wire
    connected to the “+12VDC” connection
    (minimum 8 AWG), no longer than 36 inches
    4

    (90 cm) from the amplifier to the ground
    connection point. In some vehicles, it may be
    necessary to upgrade the battery ground wire.
    (See page 5 for important notice).
    7) Securely mount the amplifier using the
    supplied screws.
    8) Connect the positive and negative power
    wires to the amplifier. A fuse near the
    amplifier is not necessary.
    9) Connect the remote turn-on wire
    to the amplifier.
    10) Connect the input cables to the amplifier.
    11) Connect the speaker cables to the amplifier.
    12) Carefully review the amplifier’s control
    settings to make sure that they are set
    according to the needs of the system.
    13) Install the power wire fuse (40A for a
    single A4300) and reconnect the negative
    battery post terminal.
    14) Turn on the source unit at a low level
    to double-check that the amplifier is
    configured correctly. Resist the temptation
    to crank it up until you have verified the
    control settings.
    15) Make necessary adjustments to the input
    sensitivity controls to obtain the right
    overall output and the desired balance
    in the system. See Appendix A (page 14)
    for the recommended input sensitivity
    setting method.
    16) Enjoy the fruits of your labor with your
    favorite music.
    POWER CONNECTIONS
    Before installing the amplifier, disconnect the
    negative (ground) wire from the vehicle’s battery.
    This will prevent accidental damage to the system,
    the vehicle and your body during installation.

    JL AUDIO A4300

    The A4300’s “+12VDC” and “Ground”
    connections are designed to accept 8 AWG 4 AWG power wire. 8 AWG is a minimum power
    wire size for this amplifier.
    If you are installing the A4300 with other
    amplifiers and wish to use a single main power
    wire, use 4 AWG or larger main power wire
    (depending on the overall current demands of all
    the amplifiers in the system). This 4 AWG or
    larger power wire should terminate into a
    distribution block mounted as close to the
    amplifiers as possible and should connect to the
    A4300 with 8 AWG - 4 AWG power wire.
    Note: Smaller AWG numbers mean bigger wire
    and vice-versa (1/0 AWG is the largest, 2 AWG is
    smaller, then 4 AWG, then 8 AWG, etc.).
    To connect the power wires to the amplifier,
    first back out the set screw on the top of the
    terminal block, using the supplied 2.5 mm hex
    wrench. Strip 1/2 inch (12 mm) of insulation from
    the end of each wire and insert the bare wire into
    the terminal block, seating it firmly so that no
    bare wire is exposed. While holding the wire in
    place, tighten the set screw firmly, taking care not
    to strip the head of the screw.
    The ground connection should be made using
    the same gauge wire as the power connection
    and should be kept as short as possible, while
    accessing a solid 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 connection between the chassis
    and the termination of the ground wire. For
    optimal grounding, we recommend the use of a
    JL Audio ECS master ground lug (XA-MGL-1).
    Alternatively, a sheet metal screw or bolt can be
    used with a star washer.
    Any wires run through metal barriers (such
    as firewalls), must be protected with a high
    quality rubber grommet to prevent damage to the
    insulation of the wire. Failure to do so may result
    in a dangerous short circuit.

    JL AUDIO A4300

    Many vehicles employ small (10 AWG 6 AWG) wire to ground the battery to the
    vehicle chassis and to connect the alternator’s
    positive connection 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.
    FUSE REQUIREMENTS
    It is absolutely vital that the main power
    wire(s) to the amplifier(s) in the system be
    fused within 18 inches (45 cm) of the positive
    battery post connection. The fuse value at each
    power wire should be high enough for all of the
    equipment being run from that power wire. If
    only the A4300 is being run from that power wire,
    we recommend a 40A fuse be used. AFS (mini
    blade fuse), AGU (big glass fuse) or MaxiFuse™
    (big plastic-body fuse) types are recommended.
    No fuse is required or recommended directly
    before the amplifier power connection. If one is
    desired, we recommend the use of a 40A fuse.
    TURN-ON LEAD
    The A4300 uses a conventional +12V remote
    turn-on lead, typically controlled by the source
    unit’s remote turn-on output. The amplifier will
    turn on when +12V is present at its “Remote”
    input and turn off when +12V is switched off. If
    a source unit does not have a dedicated remote
    turn-on output, the amplifier’s turn-on lead can
    be connected to +12V via a switch that derives
    power from an ignition-switched circuit.
    The A4300’s “Remote” turn-on connector is
    designed to accept 18 AWG – 12 AWG wire. To
    connect the remote turn-on wire to the amplifier,
    first back out the set screw on the top of the
    terminal block, using the supplied 2.5mm hex
    wrench. Strip 1/2 inch (12mm) of wire and insert
    the bare wire into the terminal block, seating it
    firmly so that no bare wire is exposed. While
    holding the wire in the terminal, tighten the set
    screw firmly, taking care not to strip the head of
    the screw and making sure that the wire (not the
    insulation) is firmly gripped by the set screw.

    5



  • Page 4

    INPUT SECTION
    The A4300’s input section allows you to send
    signal to the amplifier section through the use of
    either two or four differential-balanced inputs.
    Input connections are via traditional
    RCA-type jacks.

    If you wish to send four discrete channels into
    the A4300, simply use all four inputs (channels
    1 & 2 and channels 3 & 4) and set the “CH 3&4
    Input From” switch to “Discrete”.
    If you wish to feed all four channels by using
    only two channels of input, set the “CH 3&4
    Input From” switch to “1&2” and use only the
    inputs to channels 1 & 2.
    Input Voltage Range:
    A wide range of signal input voltages can be
    accommodated by the A4300’s input sections
    (200mV – 8V). This wide range is split up into
    two sub-ranges, accessible via a switch located to
    the left of the Input Connectors. Be aware that the
    position of this switch will dictate the sensitivity
    range for all four input channels.
    The “Low” position on the “Input Voltage”
    switch selects an input sensitivity range between
    200mV and 2V. This means that the “Input
    Sens.” rotary control will operate within that
    voltage window. If you are using an aftermarket
    source unit or an OEM interface processor with
    conventional preamp-level outputs, this is most
    likely the position that you will use.
    The “High” position on the “Input Voltage”
    switch selects an input sensitivity range between
    800mV and 8V. This is useful for certain highoutput preamp level signals as well as speakerlevel output from source units and
    small amplifiers.

    6

    To use speaker-level sources, splice the speaker
    output wires of the source unit or small amplifier
    onto a pair of RCA plugs for each input pair.
    No line output converter is needed in most cases.

    Do not increase any “Input Sens.” setting for
    any channel(s) of any amplifier in the system
    beyond the maximum level established during
    the procedure outlined in Appendix A (page
    14). Doing so will result in audible distortion
    and possible speaker damage.

    The output of the amplifier will decrease for
    a given input voltage when the “Input Range”
    switch is placed in the “High” position.
    Conversely, the output will be higher with the
    switch in the “Low” position. While this may
    sound counter-intuitive, it is consistent with the
    descriptions in this section.

    FILTER CONTROLS
    Most speakers are not designed to reproduce
    the full range of frequencies audible by the
    human ear. For this reason, most speaker
    systems are comprised of multiple speakers, each
    dedicated to reproducing a specific frequency
    range. Filters are used to select which frequency
    range is sent to each section of a speaker system.
    The division of frequency ranges to different
    speakers can be done with passive filters (coils
    and/or capacitors between the amplifier outputs
    and the speakers), which are acceptable and
    commonly used for filtering between midrange speakers and tweeters. Filtering between
    subwoofer systems and satellite speaker systems
    is best done with active filters, which cut off
    frequency content at the input to the amplifier.
    Active filters are more stable than passive filters
    and do not introduce extraneous resistance,
    which can degrade subwoofer performance.
    The active filter built into each channel section
    of the A4300 can be used to eliminate potentially
    harmful and/or undesired frequencies from
    making their way through the amplifier sections
    to the speaker(s). This serves to improve tonal
    balance and to avoid distortion and possible
    speaker failure. Correct use of these filters can
    substantially increase the longevity and fidelity
    of your audio system.

    INPUT SENSITIVITY CONTROLS
    Once the appropriate “Input Voltage” range
    has been selected, the controls labeled “Input
    Sens.” located in each “Channel Controls”
    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 maximum
    clean output, please refer to Appendix A (page
    14) in this manual. After using this procedure,
    you can then adjust any or all “Input Sens.”
    levels downward if this is required to achieve the
    desired system balance.

    JL AUDIO A4300

    JL AUDIO A4300

    1) “Filter Mode” Control: The A4300 employs a
    12dB per octave filter for each pair of channels
    (one filter for channels 1&2 and another filter
    for channels 3&4). Each of these filters can
    be configured independently into one of two
    filter types or defeated completely by way of the
    three-position “Filter Mode” switches:
    “Off”: Defeats the filter completely, allowing
    the full range of frequencies present at the
    inputs to feed the amplifier. This is useful
    for systems utilizing outboard crossovers or
    requiring full-range reproduction from one or
    both of the A4300’s channel pairs.
    “LP” (Low-Pass): Configures the filter to
    attenuate frequencies above the selected filter
    frequency at a rate of 12dB per octave. This is
    useful for connection of subwoofer(s) to one
    or both of the A4300’s channel pairs in a
    bi-amplified system.
    “HP” (High-Pass): Configures the filter to
    attenuate frequencies below the selected filter
    frequency at a rate of 12dB per octave. This is
    useful for connection of component speakers to
    one or both of the A4300’s channel pairs in a
    bi-amplified system.
    2) “Filter Freq. (Hz)” The filter frequency
    markings surrounding this rotary control
    are for reference purposes and are generally
    accurate to within 1/3 octave or better. If you
    would like to select the filter cutoff frequency
    with a higher level of precision, consult the
    chart in Appendix B (page 15).
    Tuning Hint: If you are using the A4300 to drive
    a subwoofer system (“LP” mode), a component
    satellite speaker system (“HP” mode) or both,
    80 Hz is a good baseline “Filter Freq. (Hz)”
    setting. After properly adjusting the “Input
    Sens.”, as outlined in Appendix A (page 14), you
    can fine tune the “Filter Freq. (Hz)” control to
    achieve the desired system frequency response.

    7



  • Page 5

    BASS BOOST CONTROLS
    2) “Sum”: When the A4300 is being used to drive
    front and rear speaker systems, this preamp
    output mode will deliver a summed front/rear
    stereo signal to a subwoofer amplifier, while
    permitting fading of the front and rear speaker
    systems from the source unit. This method
    prevents a loss of signal to the subwoofer
    amplifier when the system is faded to the front
    or the rear by the head unit.

    1) “CH 3&4 Bass Boost”: Found in the “Channel
    3 & 4 Controls” section, this switch allows the
    user to activate a 6 dB boost centered at 48 Hz
    for channels 3 & 4. When the “CH 3&4 Bass
    Boost” is activated, the inputs to “CH 3 (Left)”
    and “CH 4 (Right)” are summed to create a
    mono signal. The “Filter Mode” switch in the
    “Channel 3 & 4” section must be in the “LP”
    position for the bass boost to be functional.
    2) “Remote Bass Port”: This port allows you to
    connect an optional remote boost knob (sold
    separately as JL Audio Model RBC-1) that can
    be mounted in the front of the vehicle. With
    the RBC-1 connected, the boost is no longer
    limited to 0 or +6 dB, allowing a variable
    range of 0 to +12 dB of boost to be selected.
    PRE-OUTS
    The A4300 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
    “Pre-Outs Input From”.

    Note: Any signal delay between the front and rear
    channels can result in a cancellation of signals
    within certain frequency ranges when using the
    “Sum” position. If you experience a loss of bass
    output in the “Sum” position, compared to the
    “1&2” position, you are likely dealing with a
    delayed signal in either the front or rear outputs
    of the source unit. If the front to rear delay is
    desirable for other reasons or if it cannot be
    defeated at the source unit, we recommend that
    you use the “1&2” position.
    Note: In either mode, the preamp output signal
    is not affected by the “CH 3&4 Bass Boost”
    processing selected for the amplifier or by any
    crossover filter selected (if the input signal is fullrange, the preamp output will be full-range).
    Note: The signal level of the “Preamp Output” is
    line-level (low voltage), regardless of the position
    selected in the A4300’s “Input Voltage” switch.
    An additional amplifier connected to these
    preamp outputs should have its input voltage
    switch set to the “Low” position.

    1) “1&2”: The preamp output delivers the same
    signal that is connected to the CH 1&2 Inputs.
    This mode is useful for feeding a subwoofer
    amplifier when the A4300 is being used to
    drive front and rear speaker systems. In this
    mode, the preamp output signal will depend
    only on the input signal level of CH 1&2,
    allowing Channels 3&4 to be faded without
    affecting the subwoofer level. If CH 1&2 is
    faded in this mode, the signal level of the
    preamp output will change accordingly.
    8

    SPEAKER OUTPUTS
    The A4300’s speaker outputs are designed to
    accept 16 AWG - 8 AWG wire.
    Each pair of the A4300’s channels are
    designed to deliver power into speaker loads equal
    to or greater than 2 ohms per channel when using
    a “stereo” configuration and speaker loads equal
    to or greater than 4 ohms per bridged pair of
    channels when using a “bridged” configuration.

    JL AUDIO A4300

    Speaker loads below 2 ohms nominal per
    channel are not recommended and may cause
    the amplifier to initiate a protection mode
    which reduces power output.
    BRIDGING CONSIDERATIONS
    Bridging is the practice of combining the
    output of two amplifier channels to drive a single
    load. When bridged, each channel produces
    signals of equal magnitude, but opposite polarity.
    The combined output of the two channels
    provides twice the output voltage available from a
    single channel. The A4300 has been designed for
    bridging of its channel pairs without the need for
    input inversion adaptors.
    To bridge a pair of channels, use the
    “Left +” and “Right –” speaker connectors only
    (the “Left –” and “Right +” remain unused).
    When bridged, each channel will deliver
    optimum power into a 4 ohm load.

    JL AUDIO A4300

    When a pair of channels are bridged, they
    will deliver 150W x 1 into a 4 ohm load or
    90W x 1 into an 8 ohm load. Operating a
    pair of bridged channels into a load lower
    than 4 ohms is not recommended.
    Because a bridged pair of channels requires
    that both channels receive input, you need to
    connect both left and right inputs to the source
    unit. Connection of only one input will result in
    reduced power output, increased distortion and
    can cause the amplifier to overheat.
    Do not do this!
    When a pair of the A4300’s channels are
    operating in bridged mode, the output will be in
    mono (only one channel). This mono channel
    can contain right channel only information,
    left channel only information or the sum of
    the information from both the right and left
    channels. In order to achieve one of these options,
    configure the inputs to that pair of channels in
    one of these two ways:
    1) Left Channel Only or Right Channel Only
    Information: If you wish to send a left-only
    or right-only signal to a pair of the A4300’s
    channels, use a “Y-Adaptor” to split the single
    channel signal into both left and right RCA
    inputs. This option is useful when using a pair
    of the A4300’s channels to drive left channel
    speakers only and the other pair of the A4300’s
    channels to drive right channel speakers only.
    2) Left + Right Channel Information:
    When bridged and fed by a stereo input, a pair
    of the A4300’s channels will automatically
    combine the left and right channels into a
    summed mono (left + right) channel. This
    option is useful when using a pair of the
    A4300’s channels to drive a subwoofer system
    or a summed mono center channel.

    9



  • Page 6

    AMPLIFIER STATUS INDICATOR LIGHTS &
    PROTECTION CIRCUITRY
    There are two status indicator lights on the
    input / control end of the amplifier.

    1) “Power” (Green): lights to indicate that the
    amplifier is turned on and operating normally.
    2) “Protect” (Red): Indicates that the amplifier
    protection circuitry has been activated to
    prevent product failure due to a short-circuit
    or a dangerously low impedance connected
    to the amplifier output(s). Connecting the
    speaker outputs to an impedance lower than
    2 ohms stereo (4 ohms bridged) will cause
    this protection mode to activate. When this
    protection mode is activated, the amplifier will
    reduce it maximum power output to protect its
    circuitry, which will manifest itself as increased
    distortion. When the problem is corrected, the
    amplifier will return to normal operation.
    Advanced Rollback Thermal protection
    Unlike conventional thermal protection
    systems, which shut down an amplifier when it
    overheats, this system protects the amplifier by
    gradually reducing power output if the amplifier’s
    safe operating temperature is exceeded. The
    amplifier will continue to operate and return
    to normal power output once its temperature
    returns to a normal range.

    10

    Low-Voltage protection:
    If the car’s supply voltage drops below 10
    volts, the entire amplifier will shut itself off to
    protect its internal circuitry. The green “Power”
    indicator will turn off when this occurs. The
    amplifier will turn back on when voltage climbs
    back above 10 volts. This may happen in a rapid
    cycle when bass-heavy program material causes
    a weak charging system to dip below 10 volts
    momentarily. If this is happening in your system,
    turn your audio system off and have your power
    wiring, ground connections and charging
    system inspected.
    SERVICING YOUR JL AUDIO AMPLIFIER
    If your amplifier fails or malfunctions, please
    return it to your authorized JL Audio dealer so
    that it may be sent in to JL Audio for service.
    There are no user serviceable parts or fuses inside
    the amplifier. The unique nature of the circuitry
    in the JL Audio amplifiers requires specifically
    trained service personnel. Do not attempt
    to service the amplifier yourself or through
    unauthorized repair facilities. This will not only
    void the warranty, but may result in the creation
    of more problems within the amplifier.

    If you have any questions about the installation or
    setup of the amplifier not covered in this manual,
    please contact your dealer or technical support.
    JL Audio Technical Support:
    (954) 443-1100
    9:00 AM – 5:30 PM (Eastern Time Zone)
    Monday - Friday

    JL AUDIO A4300

    SYSTEM CONFIGURATIONS
    The A4300 is a flexible amplifier, well-suited
    for a multitude of system configurations. In
    this section, the most likely configurations are
    explained in detail.
    Once you have selected your desired
    configuration, you can use the amplifier panel
    drawing on pages 18 & 19 to mark the required
    switch positions for easy reference.
    BI-AMPLIFIED SYSTEMS
    Bi-amplified systems are defined as systems
    in which separate amplifier channels drive lowfrequency (LF) and high-frequency (HF) speakers
    and are separately filtered to send appropriate
    frequency ranges to each speaker system.
    The most common application of
    bi-amplification in mobile audio is to drive a
    subwoofer system from one or more amplifiers or
    channels and component speakers from separate
    amplifiers or channels.
    The A4300 can be configured to drive a biamplified system by itself or with a separate
    subwoofer amplifier.
    Bi-Amplified System with one A4300
    In this configuration, channels 3&4 of the
    A4300 will drive subwoofers (stereo or bridged)
    with low-pass filtering. Channels 1&2 will
    drive component speakers in stereo with
    high-pass filtering.

    B) Fade Subwoofer Level vs. HF Level
    Required: a source unit or processor with two
    pairs of stereo outputs.
    Input Connections: the first stereo pair source
    unit outputs is connected to the “CH 1 (Left)”
    and “CH 2 (Right)” inputs of the A4300. The
    second stereo pair of source unit outputs is
    connected to the “CH 3 (Left)” and “CH 4
    (Right)” inputs (select “Discrete” on the “CH
    3&4 Input From” switch).
    Result: in this mode, the user has the ability to
    fade or control the level of the LF channels
    relative to the HF channels via the source
    unit’s fader control without exceeding the
    maximum clean output level set by each
    amplifier section’s “Input Sens.” controls.
    C) Subwoofer Level Control Only:
    Required: a source unit or processor with
    one pair of stereo outputs and dedicated
    subwoofer outputs.
    Input Connections: the main stereo pair of
    source unit outputs is connected to the “CH
    1 (Left)” and “CH 2 (Right)” inputs of the
    A4300. The source unit’s dedicated subwoofer
    output is connected to the “CH 3 (Left)” and
    “CH 4 (Right)” inputs (select “Discrete” on
    the “CH 3&4 Input From” switch).
    Result: in this mode, the user has the ability to
    control the absolute level of the LF channels
    relative to the HF channels.

    Input connection options for a bi-amplified system
    with one A4300 are as follows:
    A) No User Adjustability:
    Required: a basic source unit or processor
    with one pair of stereo outputs.
    Input Connections: a single pair of stereo source
    unit outputs connected to the “CH 1 (Left)”
    and“CH 2 (Right)” inputs of the A4300 (select
    “1&2” on the “CH 3&4 Input From” switch.
    Result: the relative level of the LF and HF
    channels will be determined by the A4300’s
    “Input Sens.” settings and will not be user
    adjustable from the front of the vehicle.

    JL AUDIO A4300

    Set the “Input Sens.” in the “Channel 3 &
    4 Controls” section with the source unit’s
    subwoofer level control set at 3/4 of full output.
    See Appendix A (page 14) for details.
    Crossover Setup for Bi-Amplified System
    with one A4300:
    Once the input sections have been configured
    appropriately, go to the “Channel 3 & 4
    Controls”. Select “LP” (low-pass) on the “Filter
    Mode” switch and an appropriate “Filter Freq.”
    (80 Hz is a good starting point).

    11



  • Page 7

    Next, turn your attention to the “Channel 1 &
    2 Controls” and select “HP” (high-pass) on the
    “Filter Mode” switch and an appropriate “Filter
    Freq.” (again, 80 Hz is a good starting point).
    After proper adjustment of the “Input Sens.”
    controls for both channel pairs using the method
    shown in Appendix A (page 14), you can fine
    tune filter frequencies and attenuate either pair
    of channels to achieve proper balance. For precise
    filter frequency information refer to Appendix B
    (page 15).
    Bi-Amplified System with one A4300 in
    four-channel mode and a separate
    subwoofer amplifier
    This configuration requires that the separate
    subwoofer amplifier has a built-in low-pass filter.
    All JL Audio amplifiers have this feature.
    In this configuration, channels 1&2 of the A4300
    will drive front component speakerswith highpass filtering. Channels 3&4 will drive
    rear component speakers in stereo, also with
    high-pass filtering. The separate amplifier
    will drive the subwoofer system with low-pass
    filtering (80 Hz is a good starting point).
    Input connection options for a bi-amplified
    system with one A4300 and a separate subwoofer
    amplifier are as follows:
    A) No User Adjustability:
    Required: a basic source unit or processor with
    one pair of stereo outputs.
    Input Connections: a single pair of stereo source
    unit outputs is connected to the “CH 1 (Left)”
    and “CH 2 (Right)” inputs of the A4300 (select
    “1&2” on the “CH 3&4 Input From” switch).
    Connect the subwoofer amplifier inputs to
    the preamp outputs of the A4300 (Select
    “1&2” on the “Pre-Outs Input From” switch.
    Alternatively, the A4300 can receive its input
    from the subwoofer amplifier’s preamp output
    set to “full-range” mode (if applicable).
    Result: the relative level of the LF and front
    and rear HF channels will be fixed by the
    A4300’s “Input Sens.” settings (as well as the
    subwoofer amplifier’s settings) and will not be
    user adjustable from the front of the vehicle.

    12

    B) Fade Subwoofer Level vs. HF Level:
    Required: a source unit or processor with front
    and rear pairs of stereo outputs.
    Input Connections: one stereo pair of source
    unit outputs is connected to the “CH 1 (Left)”
    and “CH 2 (Right)” inputs of the A4300
    (select “1&2” on the “CH 3&4 Input From”
    switch). The second stereo pair of source
    unit outputs is connected to the subwoofer
    amplifier inputs.
    Result: with this option, the user has the ability
    to fade the level of the subwoofer amplifier’s
    input relative to the HF channels, but
    cannot control front-to-rear fading of the
    HF channels. The relative level of the front and
    rear HF channels will be fixed by the A4300’s
    “Input Sens.” settings and will not be user
    adjustable from the front of the vehicle.
    C) Subwoofer Level Control Only:
    Required: a source unit or processor with left,
    right and dedicated subwoofer outputs.
    Input Connections: The main stereo pair
    of source unit outputs is connected to the
    “CH 1 (Left)” and “CH 2 (Right)” inputs
    of the A4300 (select “1&2” on the “CH 3&4
    Input From” switch). The source unit’s
    dedicated subwoofer output is connected to
    the subwoofer amplifier inputs.
    Result: with this option, the user has the ability
    to control the absolute level of the subwoofer
    channel relative to the HF channels, but
    cannot fade the front and rear HF channels
    relative to each other.

    D) Front to Rear HF Fading and Subwoofer
    Level Control:
    Required: a source unit or processor with
    front and rear pairs of stereo outputs plus a
    dedicated subwoofer output.
    Input Connections: one stereo pair of source
    unit outputs is connected to the “CH 1 (Left)”
    and “CH 2 (Right)” inputs of the A4300.
    The second stereo pair of source unit
    outputs is connected to the “CH 3 (Left)”
    and “CH 4 (Right)” inputs of the A4300
    (select “Discrete” on the “CH 3&4 Input
    From” switch). The source unit’s dedicated
    subwoofer output is connected to the
    subwoofer amplifier inputs.
    Result: with this option, the user has the ability to
    fade the front and rear HF channels relative to
    each other and also has the ability to control
    the absolute level of the subwoofer channel
    relative to the HF channels.

    Set the subwoofer amplifier’s “Input Sens.”
    with the source unit’s subwoofer level control
    set at 3/4 of full output.
    Crossover Setup for Bi-Amplified System with
    one A4300 and a separate subwoofer amplifier:
    Once the input and preamp output sections
    have been configured appropriately, go to the
    “Channel 1 & 2 Controls” and “Channel 3 &
    4 Controls” You will set both control sections
    identically to start:
    Select “HP” (high-pass) on the “Filter Mode”
    switch and an appropriate “Filter Freq.” (80 Hz is
    a good starting point). Make these adjustments to
    both control sections.
    After proper adjustment of the A4300’s
    “Input Sens.” controls, and the subwoofer
    amplifier’s input sensitivity controls, you can fine
    tune filter frequencies and attenuate either pair
    of channels to achieve proper balance. For proper
    adjustment of the “Input Sens.” controls of the
    A4300 use the method shown in Appendix A
    (page 14). For precise filter frequency information
    for the A4300 refer to Appendix B (page 15).
    Refer to the subwoofer owner’s manual for
    proper adjustments.

    Set the subwoofer amplifier’s “Input Sens.”
    with the source unit’s subwoofer level control
    set at 3/4 of full output.

    JL AUDIO A4300

    JL AUDIO A4300

    13



  • Page 8

    APPENDIX A:
    Input Sensitivity Level Setting
    Following the directions below will allow the
    installer to adjust the input sensitivity of each
    amplifier channel pair simply and easily in just a
    few minutes using equipment which is commonly
    available in installation bays.
    Necessary Equipment
    • Digital AC Voltmeter
    • CD with a sine-wave test tone recorded at
    0 dB reference level in the frequency range
    to be amplified for that set of channels
    (50 Hz for subwoofer channels, 1 kHz for a
    midrange application). Do not use attenuated
    test tones (-10 dB, -20 dB, etc.).
    The Nine-Step Procedure
    1) Disconnect the speaker(s) from the
    amplifier’s speaker output connectors.
    2) Turn off all processing (bass/treble, loudness,
    EQ, etc.) on the source unit, processors (if
    used) and amplifier. Set fader control to center
    position and subwoofer level control to 3/4 of
    maximum (if used to feed the A4300).
    3) Switch the “Input Voltage” switch to “Low”
    and turn the “Input Sens.” control all the
    way down.
    4) Set the source unit volume to 3/4 of full
    volume. This will allow for reasonable gain
    overlap with moderate clipping at full volume.
    5) Using the chart on this page, determine the target
    voltage for input sensitivity adjustment according
    to the nominal impedance of the speaker system
    connected to the amplifier outputs.
    6) Verify that you have disconnected the speakers
    before proceeding. Play a track with an
    appropriate sine wave (within the frequency
    range to be amplified by the A4300) at 3/4
    source unit volume.
    7) Connect the AC voltmeter to the speaker output
    connectors of the amplifier. If the channel
    pair is operating in stereo, it is only necessary
    to measure one channel. If bridged, make sure
    you test the voltage at the correct connectors
    (L+ and R–).

    8) Increase the “Input Sens.” control until the
    target voltage is observed with the voltmeter.
    9) Once you have adjusted the A4300 to its
    maximum low-distortion output level,
    reconnect the speaker(s). The “Input Sens.”
    controls can now be adjusted downward if the
    amplifier requires attenuation to achieve the
    desired system balance.

    Do not increase any “Input Sens.” setting for
    any amplifier channel or channel pair in the
    system beyond the maximum level established
    during this procedure. Doing so will result in
    audible distortion and possible speaker damage.
    It will be necessary to re-adjust the
    “Input Sens.” for the affected channels if any
    equalizer boost is activated after setting the
    “Input Sens.” with this procedure. This applies
    to any EQ boost circuit, including source unit
    tone controls or EQ circuits. EQ cuts will not
    require re-adjustment.

    Nom.
    Impedance

    Target AC Voltage
    Stereo

    Bridged



    13.4 V

    26.8 V



    13.4 V

    25.6 V



    13.4 V

    24.6 V



    12.8 V

    not recommended



    12.3 V

    not recommended

    APPENDIX B:
    Precise Frequency Selection Chart
    “FILTER FREQ” AMP FILTER

    Detent
    Panel
    Actual
    Number
    Marking
    Freq.
    Full counter-clockwise: 53
    01 . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
    02 . . . . . . . . . . . “50” . . . . . . . . . . . .53
    03 . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
    04 . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
    05 . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
    06 . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
    07 . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
    08 . . . . . . . . . . . “55” . . . . . . . . . . . .56
    09 . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
    10 . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
    11 . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
    12 . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
    13 . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
    14 . . . . . . . . . . . “60” . . . . . . . . . . . .65
    15 . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
    16 . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
    17 . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
    18 . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
    19 . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
    20 . . . . . . . . . . . “80” . . . . . . . . . . . .81
    21 . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
    22 . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
    23 . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
    24 . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
    25 . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
    26 . . . . . . . . . . “120” . . . . . . . . . . 115
    27 . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
    28 . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
    29 . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
    30 . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
    31 . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
    32 . . . . . . . . . . “150” . . . . . . . . . . 177
    33 . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
    34 . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
    35 . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
    36 . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
    37 . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
    38 . . . . . . . . . . “200” . . . . . . . . . . 218
    39 . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
    Full-clockwise: 225

    APPENDIX C:
    A4300 Specifications
    General Specifications:
    Recommended Fuse Value: 40A
    Recommended Fuse Type: AFS, AGU or MaxiFuse™

    Input Sections:
    No. of Inputs: Two Stereo Pairs
    Input Type: Differential-balanced with RCA jack inputs
    Input Range: Switchable from 200mV - 2V RMS to
    800mV - 8V RMS

    Amplifier Section:
    Amplifier Topology: Class A/B with patented Absolute
    Symmetry™ dual N-Channel MOSFET output design
    Power Supply: Unregulated MOSFET switching type
    Rated Power at 12.5 V (Stereo, all channels driven):
    45W RMS x 4 @ 4 ohms, 75W RMS x 4 @ 2 ohms
    Rated Power at 12.5 V (Bridged, all channels driven):
    90W RMS x 2 @ 8 ohms, 150W RMS x 2 @ 4 ohms
    THD at Rated Power:
    <0.08% @ 4 ohms per ch. (20 Hz - 20 kHz)
    Signal to Noise Ratio: >104 dB referred to rated power
    (A-weighted, 20 Hz-20 kHz noise bandwidth)
    Frequency Response: 10 Hz - 25 kHz (+0, -1dB)
    Damping Factor: >200 @ 4 ohms per ch./50 Hz,
    >100 @ 2 ohms per ch. /50 Hz
    Slew Rate: ± 22V/µs
    Power output at 14.4V supply voltage and 1% THD:
    70W RMS x 4 @ 4 ohms (14.4V, 1% THD)
    110W RMS x 4 @ 2 ohms (14.4V, 1% THD)
    Rated Power (Bridged):
    140W RMS x 2 @ 8 ohms (14.4V, 1% THD)
    220W RMS x 2 @ 4 ohms (14.4V, 1% THD)

    Amplifier Filter:
    Filter Type: State-variable, 12dB/octave Butterworth
    with continuously variable cutoff frequency selection
    from 50-200 Hz.
    Configurable as Low-Pass or High-Pass. Defeatable.

    Preamp Output:
    Pass-through type, buffered.
    Switch-selectable to pass signal from CH 1&2 inputs
    only or from all four inputs (summed).

    Dimensions(LxWxH):
    13.8" x 9.25" x 2.50" (350mm x 235mm x 63.5mm)
    Due to ongoing product development, all specifications are subject to
    change without notice.

    14

    JL AUDIO A4300

    JL AUDIO A4300

    15



  • Page 9

    APPENDIX D: TROUBLE SHOOTING
    “How do I properly set the input sensitivity on my amplifier”
    Please refer to Appendix A (page 14) 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 each channel
    of the amplifier is driving a load equal to or greater than
    2 ohms in stereo mode (4 ohms bridged).
    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.

    16

    JL AUDIO A4300

    “My amplifier shuts off once in a while, usually at higher volumes”
    Check your voltage source and grounding point. The power supply
    of the A4300 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.

    JL AUDIO A4300

    17



  • Page 10

    INSTALLATION NOTES:
    Use this diagram to document your amplifier’s switch and control positions.

    18

    JL AUDIO A4300

    JL AUDIO A4300

    19



  • Page 11

    LIMITED WARRANTY - AMPLIFIERS (USA)
    JL AUDIO warrants this product to be free of defects in materials and workmanship for a period of
    ninety (90) days from the original date of purchase. The warranty term is extended to two (2) years if
    installation is performed or approved by an authorized JL AUDIO dealer (proof of installation or approval
    required on purchase receipt).
    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
    or remanufactured product at no charge. Damage caused by the following is not covered under warranty:
    accident, misuse, abuse, product modification or neglect, failure to follow installation instructions,
    unauthorized repair attempts, misrepresentations by the seller. This warranty does not cover incidental
    or consequential damages and does not cover the cost of removing or reinstalling the unit(s). Cosmetic
    damage due to accident or normal wear and tear is not covered under warranty.
    Warranty is void if the product’s serial number has been removed or defaced.
    Any applicable implied warranties are limited in duration to the period of the express warranty as
    provided herein beginning with the date of the original purchase at retail, and no warranties, whether
    express or implied, shall apply to this product thereafter. Some states do not allow limitations on implied
    warranties, therefore these exclusions may not apply to you. This warranty gives you specific legal rights,
    and you may also have other rights which vary from state to state.
    If you need service on your JL AUDIO product:
    All warranty returns should be sent to JL AUDIO’s Amplifier Service Facility freight-prepaid through
    an authorized JL AUDIO dealer and must be accompanied by proof of purchase (a copy of the original
    sales receipt). Direct returns from consumers or non-authorized dealers will be refused unless specifically
    authorized by JL AUDIO with a valid return authorization number.
    Warranty expiration on products returned without proof of purchase will be determined from the
    manufacturing date code. Coverage may be invalidated as this date is previous to purchase date. Nondefective items received will be returned freight-collect. Customer is responsible for shipping charges and
    insurance in sending the product to JL AUDIO. Freight damage on returns is not covered under warranty.

    For Service Information in the U.S.A. please call
    JL Audio Customer Service: (954) 443-1100
    9:00 AM – 5:30 PM (Eastern Time Zone)
    JL Audio, Inc
    10369 North Commerce Pkwy.
    Miramar, FL 33025
    (do not send product for repair to this address)
    International Warranties:
    Products purchased outside the United States of America are covered only
    by that country’s distributor and not by JL Audio, Inc.

    Absolute Symmetry™ Class A/B Amplifier Circuit is covered by U.S. Patent #6,294,959 and is pending in the
    countries listed below. Austria, Belgium, Brazil, Canada, China, France, Germany, Indonesia, Italy, Japan, Republic of Korea,
    Mexico, Netherlands, Norway, Russian Federation, Singapore, Sweden, Switzerland, United Kingdom, and all other PCT countries.

    A4300MAN-04-2006






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