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| JL Audio - 300/4
v3
Owner’s Manual
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Cooling efficiency Considerations:
Your JL Audio amplifier employs an
advanced type of heat management, called
RealSink™. This feature takes advantage of
convection and radiation effects to remove
heat from the amplifier circuitry. For optimum
cooling performance, the vertical heat sinks
located at the back of the amplifier 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, but
you still need to follow some basic guidelines:
• Amplifier mounted vertically with heat sink fins
pointing up: Optimum
• Amplifier mounted horizontally,
right side up: Good
• Amplifier mounted horizontally, but upside
down: Fair (not recommended if there is
less than 1 inch (2.5 cm) clearance above the
amplifier heat sinks)
• Amplifier mounted vertically with heat sink fins
pointing laterally: Fair
• Amplifier mounted vertically with heat sink fins
pointing down: Poor (not recommended)
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.
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.
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
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.
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.
Front Channel
Input Voltage
Range Selector
(pg. 6)
Front Channel
Filter Slope
Selection
(pg. 8)
Front Channel
Filter Frequency
Range Selector
(pg. 8)
Front Channel
Left and Right
Input Jacks
(pg. 6)
Rear Channel
Left and Right
Input Jacks
(pg. 6)
Front Channel
Input Mode
Selector
(pg. 6)
Remote Turn-On
Connector
(pg. 6)
Chassis Ground
Connector
(pg. 6)
+12 V Power
Connector
(pg. 5)
Front Channel
Speaker Outputs
(pg. 8)
Rear Channel
Input Voltage
Range Selector
(pg. 6)
Rear Channel
Filter Slope
Selection
(pg. 8)
Rear Channel
Filter Frequency
Range Selector
(pg. 8)
Rear Channel
Input Sensitivity
Control
(pg. 7)
Rear Channel
Speaker Outputs
(pg. 8)
Front Channel
Filter Cutoff
Frequency Selector
(pg. 8)
Front Channel
Filter Mode
Selector
(pg. 7)
Rear Channel
Filter Mode
Selector
(pg. 7)
Rear Channel
Filter Cutoff
Frequency Selector
(pg. 8)
Front Channel
Input Sensitivity
Control
(pg. 7)
Bridged
Left
Right
+12VDC
Ground Remote
Front Filter Controls
Front Input Section
Front Speaker Outputs
Bridged
Left
Right
Rear Speaker Outputs
Left Ch.
Right Ch.
Filter Freq. (Hz)
Filter Slope
Freq. Range
Input Voltage
Input Sens.
Input Mode
12dB | 24dB
Filter Mode
Off | LP | HP
x1 | x10
Low | High
Rear Input Section
Left Ch.
Right Ch.
Input Voltage
Input Sens.
Low | High
2ch | 4ch
50
60
75
95
130
200
500
300/4
v3
Four-Channel Full-Range Amplifier
Rear Filter Controls
Filter Freq. (Hz)
Filter Slope
Freq. Range
12dB | 24dB
Filter Mode
Off | LP | HP
x1 | x10
50
60
75
95
130
200
500