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3
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.
IMPORTANT
!
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).
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
Protection Status
Indicator
(pg. 11)
Left & Right
Preamp Output Jacks
(pg. 8)
Left & Right
Preamp Input Jacks
(pg. 6)
High-Level
Input Jack
(pg. 6,7)
Power Status
Indicator
(pg. 11)
Bass Boost
Control
(pg. 9)
Filter
Frequency Selector
(pg. 8)
Remote
Level Port
(pg. 9)
Input Sensitivity
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)