JL Audio J2250.1 User Manual
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.
PROTECT YOUR HEARING!
LP Filter Frequency (Hz)Input Sens. Bass Boost
Power Protect
Remote
Level Port
LEFT
RIGHT
LEFT
RIGHT
Preamp
Outputs
Amplifier
Inputs
min max 60 240 O +9dB
High-Level Inputs
Protectio n Status
Indicator
(pg. 11)
Left & Right
Preamp Out put Jacks
(pg. 8)
Left & Right
Preamp Inp ut Jacks
(pg. 6)
High-Level
Input Jack
(pg. 6,7)
Power Stat us
Indicator
(pg. 11)
Bass Boost
Control
(pg. 9)
Filter
Frequenc y Selector
(pg. 8)
Remote
Level Po rt
(pg. 9)
Input Sensitiv ity
Control
(pg. 7)
+12 V Power
Connector
(pg. 5)
Chassis Ground
Connector
(pg. 5)
Remote Turn-On
Connector
(pg. 6)
Speaker Outputs
(pg. 10)
Made in China
Speaker Output (Mono)Ground FUSE
30A
Remote+ 12VDC
Fuse
(pg. 5)
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.
Serial Number:
INSTALLATION APPLICATIONS
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
th e w ar ran ty.
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.
2 JL Audio
PLANNING YOUR INSTALLATION
IMPORTANT
!
Speaker Outputs
(pg. 10)
Speaker Output (Mono)Ground FUSE
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.
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.
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.
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.
• 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
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.
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.
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).
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.
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 necessar y 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 JL Audio
POWER CONNECTIONS
Speaker Output (Mono)Ground FUSE
30A
Remote+ 12VDC
IMPORTANT
!
Speaker Output (Mono)Ground FUSE
30A
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.
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 VD C” (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.
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
J2-250.1. 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-tometal connection between the chassis and the
termination of the ground wire. The use of a star
washer to lock down the connection is advisable.
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 batter y 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.
5
“REMOTE” TURNON
Speaker Output (Mono)Ground FUSE
30A
Remote+ 12VDC
LP Filter Frequency (Hz)Input Sens. Bass Boost
Remote
Level Port
LEFT
RIGHT
LEFT
RIGHT
Preamp
Outputs
Amplifier
Inputs
min max 60 240 O +9dB
High-Level Inputs
The J2-250.1 is turned on and off
using a conventional +12V remote turnon lead, typically controlled by the
source unit’s remote turn-on output.
The amplif ier 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 ignitionswitched 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.
“AMPLIFIER INPUTS”
The J2-250.1 offers two input connection
methods, one for high-level (speaker level) signals
and one for low-level (preamp level) signals.
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 JL Audio
Loading...