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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:
Chassis Ground
Connector
(pg. 6)
+12 V Power
Remote Turn-On
Connector
Connector
(pg. 6)
(pg. 7)
+12VDC
Ground Remote
450/4
v2
Four-Channel System Amplifier
2 | JL Audio - 450/4
Owner's Manual
v2
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.
Preamp Output
Signal Selector
Speaker Outputs
(pg. 10)
Preamp Output Section
CH 1 & 2 Speaker Outputs
Signal From
1 & 2 | 3 & 4 | All
Left
150W
Left Output
Right Output
Bridged: 300W x 1 (3-8 )
Left and Right
Preamp Output Jacks
(pg. 10)
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)
CH 1&2
Infrasonic Filter
Filter Slope
On/O Switch
Selection / Defeat
(pg. 11)
(pg. 9)
CH 1&2
CH 1&2
Bass EQ
Filter Frequency
On/O Switch
Range Selector
(pg. 11)
(pg. 11)
(pg. 9)
CH 1 & 2 Bass Control
CH 1 & 2 Filter Section
Bass EQ
Infrasonic Filter
Freq. Range Filter Mode | Slope
Off | On
Off | 30Hz
x1 | x10
Off | 12dB | 24dB
95
Either
Filter Type
75
130
feature
sums the
CH 1&2 input
60
200
Right
signals to
mono when
150W
LP | BP | HP
(1.5-4Ω)
50
500
activated.
Remote
Filter Freq. (Hz)
Bass Port
Jack for
Selects CH 1&2
Remote Bass
HP or LP Cuto
Control Knob
Frequency or HP Cuto
(pg. 11)
of Bandpass Filter
(pg. 8)
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.
CH 3&4
CH 1&2 Input
HP Filter Slope
Sensitivity Control
Selection / Defeat
(pg. 8)
(pg. 9)
CH 1&2
CH 3&4
CH 3&4
Input Voltage
Filter Frequency
Input Voltage
Range Selector
Range Selector
Range Selector
(pg. 7)
(pg. 9)
(pg. 7)
CH 1 & 2 Input Section
CH 3 & 4 Filter Section
CH 3 & 4 Input Section
Input Voltage
Input Sens.
Freq. Range
High-Pass Filter
Input Voltage
Low | High
x1 | x10
Off | 12dB | 24dB
Low | High
95
Input Mode
Also sets
75
130
low-pass
cutoff for
60
200
CH 1 & 2
Bandpass
2ch | 4ch
Filter
50
500
(if selected)
1 & 2
1 & 2
CH 1
CH 2
CH 3
Inputs
and
HP Filter Freq. (Hz)
(Left)
(Right)
Only
3 & 4
(Left)
Selects CH 3&4
CH 1&2
Selects
Left and Right
2ch / 4ch
High-Pass Cuto
Left and Right
Frequency and Low-Pass
Input Jacks
Input Mode
(pg. 7)
(pg. 7)
Cuto for CH 1&2 Bandpass
Filter
(pg. 10)
CH 3&4
Input Sensitivity
Control
(pg. 8)
CH 3&4
Speaker Outputs
(pg. 11)
CH 3 & 4 Speaker Outputs
Input Sens.
Left
Right
75W
75W
(1.5-4Ω)
CH 4
Bridged: 150W x 1 (3-8 )
(Right)
CH 3&4
Input Jacks
(pg. 7)
3
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