owner’s manual
1000W 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.
IMPORTANT
!
ProteCt Your Hearing!
installation aPPliCations
Planning Your installation
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.
This amplifier is designed for operation in
vehicles with 12V, 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.
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.
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.
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.
Remote Turn-On
Connector
(pg. 6)
Chassis Ground +12 V Power
Fuses
(pg. 5)
Speaker Outputs
(pg. 9)
Connector
(pg. 5)
Connector
(pg. 5)
• 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.
Ground
Remote
+ ��VDC
FUSES
35A
Speaker Output (Mono)
Serial Number:
35A
35A
• Protect all system wires from sharp metal
edges and wear by carefully routing them,
tying them down and using grommets and
loom where appropriate.
Made in China
High-Level
Input Jack
(pgs. 6, 7)
Left & Right
Preamp Output Jacks
(pg. 8)
Low-Pass Filter
Frequency Selector
(pg. 8)
Remote
Level Port
(pg. 9)
Power Status
Indicator
(pg. 10)
Left & Right
Preamp Input Jacks
(pg. 6)
Input Sensitivity
Control
(pg. 7)
Bass Boost
Level Control
(pg. 9)
Protection
Status Indicator
(pg. 10)
• 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.
Amplifier Inputs
Pre-Outs
Amplifier Controls
Amplifier Status
High-Level Inputs
LEFT
LEFT
Protect Power
min max
40
300
Off +12dB
Bass Boost
Input Sens.
LP Filter Frequency (Hz)
Remote Level Port
RIGHT
RIGHT
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ProduCt desCriPtion
Power ConneCtions
The JL Audio J2-1000.1 is a monoblock
subwoofer amplifier utilizing highly efficient
Class D technology. Its frequency response
is limited to the range below 160 Hz. It is
not designed for driving midrange speakers
or tweeters. Every aspect of its operation
has been optimized for low-frequency
amplification. For detailed specifications,
please refer to Appendix B (page 13).
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 4 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).
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.
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.
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.
IMPORTANT
Ground
Remote
+ ��VDC
!
35A
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
J2-1000.1.
tYPiCal installation sequenCe
The following represents the sequence
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.
The J2-1000.1’s “+12 VDC” (positive) and
“Ground” (ground) connections are designed to
accept 4 AWG power wire. 4 AWG is a minimum
power wire size for this amplifier.
Fuse requirements
While the J2-1000.1 has three 35A ATC fuses
on its power connection panel, these do nothing
to protect the vehicle from a dangerous short
circuit in the power wire. They only protect 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 J2-1000.1 is being run from that power
wire, we recommend a 100A fuse be used. ANL
blade-type fuses are recommended.
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 4 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 2 AWG or 1/0
AWG power wire if additional amplifiers
are being installed with the J2-1000.1.
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.
4) Run signal cables (RCA cables) and remote
turn-on wire from the source unit to the
amplifier mounting location.
If you are installing the J2-1000.1 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
J2-1000.1 with 4 AWG power wire.
13) Install power wire fuse (100A for a single
J2-1000.1) 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.
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.).
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
J2-1000.1. Use a Phillips screwdriver to secure the
wire via the screw on the top of each terminal.
The “Ground” connection should be made
using 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.
FUSES
16) Enjoy the fruits of your labor with your
favorite music.
35A
35A
35A
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IMPORTANT
!
“remote” turn-on
“amPliFier inPuts”
“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.
The J2-1000.1 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 J2-1000.1 offers two input connection
methods, one for high-level (speaker level) signals
and one for low-level (preamp level) signals.
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:
Amplifier Inputs
High-Level Inputs
LEFT
Ground
Remote
+ ��VDC
White: Left Positive (+)
Amplifier Contro
35A
White/Black: Left Negative (–)
Black: Common Ground (rarely used)*
Gray: Right Positive (+)
Gray/Black: Right Negative (–)
min max
Input Sens.
LP
*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.
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.
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.
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.
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.
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.
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 J2-1000.1. 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
J2-1000.1 will attenuate the high-level signal to
make it compatible with its input stage.
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“lP Filter” (CrossoVer) Control
“Pre-outs” (PreamP outPuts)
“bass boost” Control
sPeaKer outPut
The J2-1000.1 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 J2-1000.1 is fully
The J2-1000.1 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 “Pre-Outs”.
The J2-1000.1 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 +12dB
(full-clockwise) and is centered at 45 Hz.
Speaker connection to the J2-1000.1 is
straightforward and takes place at the far right
of the power/speaker connection panel. A
single positive (“+”) connection and a single
negative (“–”) connection are available via a
connector labeled “Speaker Output (Mono)”.
variable between 40 Hz and 300 Hz via the “LP
Filter Frequency” control knob. The 12 o’clock
position corresponds to a 150 Hz filter frequency.
The “10 o’clock” position corresponds to 80 Hz
and is a good starting point for system tuning.
Pre-Outs
LEFT
Speaker Output (Mono)
Off +12dB
)
Bass Boost
Controls
RIGHT
40
300
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.
remote leVel Control
LP Filter Frequency (Hz)
The J2-1000.1 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.
IMPORTANT
!
Speaker loads below 1Ω nominal are not
recommended and will cause the amplifier to
enter into a protection mode.
IMPORTANT
!
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.
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.
Remote Level Port
IMPORTANT
!
Do NOT attempt to “bridge” two J2-1000.1’s
together or combine their output to a single
load in any manner. Doing so will damage
the amplifier(s).
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).
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.
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9
status indiCator ligHts /
serViCing Your amPliFier
ProteCtion CirCuitrY
There are two status indicator lights on the top
of the amplifier. 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): lights to indicate that the
amplifier is turned on and operating normally.
2) “Protect” (Red): 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.
Amplifier Status
Protect Power
Jl audio technical support:
(954) 443-1100
9:00 AM – 5:30 PM (Eastern Time Zone)
Monday - Friday
Level Port
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aPPendix a:
aPPendix b:
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.
J2-1000.1 specifications
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.
general specifications:
Recommended Fuse Value: 100A
Recommended Fuse Type: ANL at battery, 3x 35A ATC
fuses on amplifier chassis.
necessary equipment
input section:
• Digital AC Voltmeter
Low-Level Input: Single-ended with RCA jacks
Low-Level Input Range: 200mV - 6.5V RMS
High-Level Input: Single-ended with molded connector
High-Level Input Range: 630mV - 20.5V RMS
• 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.
amplifier section:
Amplifier Topology: Class D Monaural
Power Supply: PWM switching type, unregulated
Rated Power with less than 1% THD (14.4V supply):
400W RMS x 1 @ 4Ω
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 connected, set the amplifier’s Remote Bass
Control at maximum (full clockwise).
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.
500W RMS x 1 @ 3Ω
700W RMS x 1 @ 2Ω
900W RMS x 1 @ 1.5Ω
1000W RMS x 1 @ 1Ω
Frequency Response: 10 - 160 Hz (+/– 0.5dB)
Crossover section:
3) Turn the “Input Sens.” control all the
way down.
Low-Pass Filter: 12 dB/octave with continuously variable
nom. impedance
target aC Voltage
cutoff frequency selection from 40 - 300 Hz. Non-defeatable.
4Ω
3Ω
40 V
39 V
38 V
37 V
32 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.
Preamp outputs:
2-Channel, pass-through with unity gain, RCA-type jacks.
2Ω
1.5Ω
1Ω
bass boost:
Single-band with 45 Hz center frequency, adjustable from
0 to +12dB.
6) Verify that you have disconnected the speakers
before proceeding. Play a track with an
remote level Control:
Via included, wired remote control knob. Full mute to
0 dB range.
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 –).
dimensions (lxwxH):
14.60" x 9.60" x 2.15" (371 mm x 244 mm x 55 mm)
Due to ongoing product development, all specifications are subject to
change without notice.
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aPPendix C: troublesHooting
“How do i properly set the input sensitivity on my amplifier”
“my amplifier turns on, but there is no output”
Check the input signal using an AC voltmeter to measure the
Please refer to Appendix A (page 12) to set the input sensitivity for
maximum, low-distortion output.
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.
“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.
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.
“my amplifier’s output fluctuates when i tap on it or hit a bump”
Check the connections to the amplifier. Make sure that the
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.
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.
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installation notes:
Use this diagram to document your amplifier’s switch and control positions.
Amplifier Inputs
Pre-Outs
Amplifier Controls
Amplifier Status
High-Level Inputs
LEFT
LEFT
Protect Power
min max
40
300
Off +12dB
Bass Boost
Input Sens.
LP Filter Frequency (Hz)
Remote Level Port
RIGHT
RIGHT
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installation notes:
installation notes:
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