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 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 our Technical Support Department
at (954) 443-1100 during business hours.
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IMPORTANT
!
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.
Mounting the amplifier upside down is
strongly discouraged.
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.
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
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 appropriate
hardware so that it does not come loose in the
event of a collision or a sudden jolt to the vehicle.
ventilated with the aid of a fan. In normal
applications, fan-cooling is not necessary.
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.
Speaker Outputs
(pg. 10)
• 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.
Speaker Output (Mono)
• Protect all system wires from sharp metal
edges and wear by carefully routing them,
tying them down and using grommets and
loom where appropriate.
• 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.
Product descriPtion
The JL Audio J2-250.1 is a monoblock
subwoofer amplifier utilizing Class A/B
technology. Its frequency response is limited
to the range below 100 Hz. It is not designed
for driving midrange speakers or tweeters.
It has been optimized for low-frequency
amplification. For detailed specifications,
please refer to Appendix B (page 13).
3
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tYPical installation sequence
The following represents the sequence
7) Securely mount the amplifier using
appropriate hardware.
8) Connect the positive and negative power
wires to the amplifier.
9) Connect the remote turn-on wire
to the amplifier.
10) Connect the RCA input cables
to the amplifier.
for a typical amplifier installation, using an
aftermarket source unit or OEM Interface
product. 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, 2 AWG or 1/0
AWG power wire if additional amplifiers
are being installed with the J2-250.1.
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 connected to the amplifier.
11) Connect the speaker wires 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 power wire fuse (30A for a single J2-250.1)
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 12)
for the recommended input sensitivity
setting method.
16) Enjoy the fruits of your labor with your
favorite music.
4) Run signal cables (RCA cables) and remote
turn-on wire from the source unit to the
amplifier mounting location.
5) Run speaker wire 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 minimum 8 AWG power wire, no longer
than 36 inches (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).
4
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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 person during installation.
Any wires run through metal barriers (such as
firewalls), must be protected with a high quality
insulating grommet to prevent damage to the
insulation of the wire. Failure to do so may result
in a dangerous short circuit.
Ground
Remote
+ 12VDC
IMPORTANT
!
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 (or larger) when installing a J2-250.1.
The J2-250.1’s “+12 VDC” (positive) and
“Ground” (ground) connections are designed
to accept up to 4 AWG power wire. 8 AWG is a
minimum power wire size for this amplifier.
If you are installing the J2-250.1 with other
amplifiers and wish to use a single main power
wire, use 2 AWG or 1/0 AWG main power wire
(depending on the overall current demands of
all the amplifiers in the system). This 2 AWG
or 1/0 AWG power wire should terminate into
a distribution block mounted as close to the
amplifiers as possible and should connect to the
J2-250.1 with 8 or 4 AWG power wire.
Fuse requirements
While the J2-250.1 has a 30A ATC fuse on its
power connection panel, this fuse does nothing to
protect the vehicle from a dangerous short circuit
in the power wire. It only protects the amplifier.
It is absolutely vital that the main power lead 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
J2-250.1 is being run from that power wire, we
recommend a 30A fuse be used. AFS, ATC, AGU
or MAXI-type fuses are recommended.
Note: that 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.).
FUSE
To connect the power and ground wires to the
amplifier, strip 1/2-inch (12 mm) of insulation
from each wire and insert the bare wire into the
the appropriate terminal block positions on the
J2-250.1. Use a Phillips screwdriver to secure the
wire via the screw on the top of each terminal.
The “Ground” connection should be made
using 8 AWG or 4 AWG wire 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. The use of a star
washer to lock down the connection is advisable.
30A
5
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“remote” turn-on
“amPliFier inPuts”
The J2-250.1 is turned on and off
using a conventional +12V remote turn-
on lead, typically controlled by the
source unit’s remote turn-on output.
The J2-250.1 offers two input connection
methods, one for high-level (speaker level) signals
and one for low-level (preamp level) signals.
Preamp
Outputs
Amplifier
Inputs
Ground
Remote
+ 12VDC
LEFT
LEFT
High-Level Inputs
a
RIGHT
RIGHT
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.
18 AWG wire is more than adequate for
the remote turn-on connection. To connect
the remote turn-on wire to the amplifier, strip
1/2-inch (12 mm) of insulation from the wire
and insert it into the “Remote” receptacle on the
power connector. Tighten the connector down
using a Phillips screwdriver.
You may run a stereo or a mono signal into
the inputs of the amplifier. The amplifier’s input
section automatically sums stereo signals to mono
for the internal amplifier section.
The amplifier will operate with only one
input connection (left or right), but will require
an increase in input sensitivity to overcome the
loss of signal. If a mono input signal is to be run
into the RCA jacks, we recommend that you use
a “Y-adaptor” to split the mono signal into both
the Left and Right inputs of the amplifier.
1) Low-Level Inputs: A standard left/
right pair of RCA type jacks in the
“Amplifier Inputs” section is used for
preamp level (low-level) signal input
on the J2-250.1. This is the preferred
connection method whenever available.
2) High-Level Inputs: If your system does not
offer a preamp level signal option, you can
connect speaker level signals directly to the
“High-Level Inputs” connector using the
supplied mating connector and wire harness.
Simply splice the appropriate left/right and
positive/negative wires to the included harness
and plug the harness into the “High-Level
Inputs” connector on the amplifier. The
J2-250.1 will attenuate the high-level signal to
make it compatible with its input stage.
6
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IMPORTANT
!
“inPut sensitiVitY” (gain) adJustment
Located next to the input connectors is a rotary
control labeled “Input Sens.”. This rotary control
can be used to match the source unit’s output
voltage to the input stage of the amplifier for
maximum clean output.
Make sure you observe correct polarity in
making the “High-Level Input” connections.
Failure to do so will result in a complete loss of
signal (no bass).
The connections for the “High-Level Inputs” plug
wires are as follows from left to right on the plug:
White: Left Positive (+)
mplifier
nputs
White/Black: Left Negative (–)
Black: Common Ground (rarely used)*
Gray: Right Positive (+)
LEFT
Gray/Black: Right Negative (–)
min max
Input Sens.
60
*The only time you will use the “Common
Ground” connection is with some older (pre-
1980’s) factory systems or head units that ground
their speakers to chassis ground. To use this
connection, ground the black wire on the plug to
chassis ground and only connect the Left and Right
Positive plug wires to the factory radio outputs.
LP Filter Fr
RIGHT
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 12) in this manual. After using this
procedure, you can then adjust the level of the
amplifier by adjusting the input sensitivity
downward, if the amplifier requires attenuation to
achieve the desired system balance.
IMPORTANT
!
If you plan to use the preamp outputs to feed a
stereo amplifier, you must connect a stereo
signal to the input of the amplifier. A mono
signal into the amplifier will result in a mono
signal out of the preamp output.
Do not increase the “Input Sens.” setting for
any amplifier in the system beyond the maximum
level established during the procedure outlined
in Appendix A (page 12). Doing so will result in
audible distortion and possible speaker damage.
7
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“lP Filter” (crossoVer) control
“PreamP outPuts”
The J2-250.1 employs a 12dB/octave low-pass
(LP) active filter for its internal channel. This
feature is designed to attenuate frequencies above
its filter frequency, so that the system’s subwoofers
do not reproduce any audible midrange content.
The low-pass filter in the J2-250.1 is fully
variable between 60 Hz and 240 Hz via the “LP
Filter Frequency” control knob. The “10 o’clock”
position corresponds to 80 Hz and is a good
starting point for system tuning.
The J2-250.1 incorporates a preamp output
section, designed to make multiple amplifier
systems easy to set up. This section consists
of a pair of RCA-type jacks marked
“Preamp Outputs”.
Preamp
Outputs
LEFT
RIGHT
max
60
240
Oꢀ
t Sens.
LP Filter Frequency (Hz)
Bass
The Preamp outputs deliver the same signal that
is being fed to the inputs. (If the input signal are
full-range, the preamp outputs will be full-range).
This signal is not affected by the bass boost or LP
FIlter processing selected for the amplifier.
IMPORTANT
!
The signal level of the preamp output is always
low-level regardless of whether you are using
the “High-Level Inputs” or the Low-Level
(RCA-jack) Inputs.
8
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“bass boost” control
remote leVel control
The J2-250.1 includes a single band, boost-
only bass equalizer controlled by a rotary knob
marked “Bass Boost”. This control has a boost
range of 0dB (full-counterclockwise) to +9dB
(full-clockwise) and is centered at 45 Hz.
The J2-250.1 includes a remote level control
that can be mounted in the front of the vehicle.
This control allows the owner to adjust the overall
subwoofer level to taste. To connect the remote
bass control knob, insert its plug into the jack
labeled “Remote Level Port” on the amplifier
and route the cable and control to the desired
location in the front of the vehicle.
Oꢀ +9dB
Hz)
Bass Boost
Protect
Remote
Level Port
+9dB
s Boost
Care should be taken to securely mount this
control in a manner that does not interfere with
vehicle operation.
When setting the amplifier’s input sensitivity,
the Remote Level Control should be unplugged or
at full clockwise rotation (maximum level).
9
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IMPORTANT
!
sPeaKer outPut
Speaker connection to the J2-250.1 is
straightforward and takes place at the far
right of the power/speaker connection
panel. Two positive (“+”) connections and
two negative (“–”) connections are available
via a connector labeled “Speaker Output
(Mono)”. The dual connections allow for two
separate speaker wire runs to be parallel-
connected to the amplifier’s mono output.
Do NOT attempt to “bridge” two J2-250.1’s
together or combine their output to a single
load in any manner. Doing so will damage the
amplifier(s).
IMPORTANT
!
Before reconnecting the battery ground and
turning the system on, verify that all control
settings on the amplifier are set according to
the needs of the system.
Speaker Output (Mono)
IMPORTANT
!
Speaker loads below 2Ω nominal are not
recommended and will cause the amplifier to
enter into a protection mode.
Do not chassis ground any speakers connected
to this or any other JL Audio amplifier. Doing so
will cause the amplifier to go into protection.
To connect the speaker wires to the amplifier,
strip 1/2-inch (12 mm) of insulation from
each speaker wire and insert them into their
appropriate connector (observing correct
polarity). Then, tighten each connector using a
Phillips screwdriver.
10
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status indicator ligHts /
serVicing Your amPliFier
Protection circuitrY
There are two status indicator lights on the
amplifier’s control panel. These are as follows:
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.
1) “Power” (Green): Located at the far left of the
amplifier’s control panel, this LED lights to
indicate that the amplifier is turned on and
operating normally.
2) “Protect” (Red): Located at the far right of the
control panel, this LED lights to indicate that
the amplifier has exceeded its safe operating
temperature or has detected a short-circuit
in its speeaker output. For information
on troubleshooting this amplifier, refer to
Appendix C (pages 14, 15).
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
Hi
Power
Protect
ote
Port
11
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aPPendix a:
input sensitivity level setting
8) Increase the “Input Sens.” control until the
target voltage is observed with the voltmeter.
9) Once you have adjusted the amplifier 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.
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.).
IMPORTANT
!
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.
the nine-step Procedure
1) Disconnect the speaker(s) from the
amplifier’s speaker output connectors.
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.
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 connected, set the amplifier’s Remote Bass
Control at maximum (full clockwise).
3) Turn the “Input Sens.” control all the
way down.
nom. impedance
target ac Voltage
4Ω
3Ω
2Ω
26.5 V
25 V
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.
22.5 V
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) at 3/4 source unit volume.
7) Connect the AC voltmeter to the speaker output
connectors of the amplifier. Make sure you test
the voltage at the correct connectors (+ and –).
12
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aPPendix b:
J2-250.1 specifications
general specifications:
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
amplifier section:
Amplifier Topology: Class A/B Monaural with
Dual N-Channel MOSFET output stage
Power Supply: PWM switching type, unregulated
Rated Power with less than 1% THD (14.4V supply):
175W RMS x 1 @ 4Ω
210W RMS x 1 @ 3Ω
250W RMS x 1 @ 2Ω
Frequency Response: 10 - 100 Hz (+/– 1 dB)
crossover section:
Low-Pass Filter: 12 dB/octave with continuously variable
cutoff frequency selection from 60 - 240 Hz. Non-defeatable.
Preamp outputs:
2-Channel, pass-through with unity gain, RCA-type jacks.
bass boost:
Single-band with 45 Hz center frequency, adjustable from
0 to +12dB.
remote level control:
Via included, wired remote control knob. Full mute to
0 dB range.
dimensions (lxwxH):
10.60" x 9.60" x 2.15" (269 mm x 244 mm x 55 mm)
Due to ongoing product development, all specifications are subject to
change without notice.
13
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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, 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.
“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.
14
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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 0.2 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.
15
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installation notes:
Use this diagram to document your amplifier’s switch and control positions.
Preamp
Outputs
Amplifier
Inputs
LEFT
LEFT
High-Level Inputs
Power
min
Inp
RIGHT
RIGHT
16
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Protect
Remote
Level Port
n
max
60
240
Oꢀ +9dB
Bass Boost
put Sens.
LP Filter Frequency (Hz)
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installation notes:
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installation notes:
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limited warrantY - amPliFiers (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
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. Non-
defective 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.
J2250_1-CH-06-2009
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