JL Audio 450/4V2 Protect Your Hearing, Installation Applications, Planning Your Installation

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.).

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.

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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

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:

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:

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:

considerations that you must take into account when planning your installation.

t "NQMJGJFS NPVOUFE WFSUJDBMMZ XJUI IFBU TJOL GJOT	t Check before drilling any holes in your vehicle
pointing up: Optimum	to make sure that you will not be drilling
t "NQMJGJFS NPVOUFE IPSJ[POUBMMZ	through a gas tank, brake line, wiring harness or
right side up: Good	other vital vehicle system.
t "NQMJGJFS NPVOUFE IPSJ[POUBMMZ CVU VQTJEF	t %P OPU SVO TZTUFN XJSJOH PVUTJEF PS VOEFSOFBUI
down: Fair (not recommended if there is	the vehicle. This is an extremely dangerous
less than 1 inch (2.5 cm) clearance above the	practice which can result in severe damage to
amplifier heat sinks)	your vehicle and person.
t "NQMJGJFS NPVOUFE WFSUJDBMMZ XJUI IFBU TJOL GJOT t 1SPUFDU BMM TZTUFN XJSFT GSPN TIBSQ NFUBM
pointing laterally: Fair	edges and wear by carefully routing them,
t "NQMJGJFS NPVOUFE WFSUJDBMMZ XJUI IFBU TJOL GJOT	tying them down and using grommets and
pointing down: Poor (not recommended)	loom where appropriate.
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compartment, under the vehicle, on the roof or in any other area that will expose the amplifier circuitry to the elements.

Chassis Ground

CH 1&2

CH 1&2 Input

CH 3&4

CH 3&4

Infrasonic Filter

Filter Slope

HP Filter Slope

Input Sensitivity

Connector

On/Off Switch

Selection / Defeat

Sensitivity Control

Selection / Defeat

Control

+12 V Power

(pg. 6)

CH 1&2

(pg. 11)

CH 1&2

(pg. 9)

CH 1&2

(pg. 8)

CH 3&4

(pg. 9)

CH 3&4

(pg. 8)

Remote Turn-On

Preamp Output

Bass EQ

Filter Frequency

Input Voltage

Filter Frequency

Input Voltage

CH 3&4

Connector

Connector

Signal Selector

Speaker Outputs

On/Off Switch

Range Selector

Range Selector

Range Selector

Range Selector

Speaker Outputs

(pg. 6)

(pg. 7)

(pg. 10)

(pg. 11)

(pg. 11)

(pg. 9)

(pg. 7)

(pg. 9)

(pg. 7)

(pg. 11)

+12VDC Ground Remote		Preamp Output Section	CH 1 & 2 Speaker Outputs
		Signal From
		1 & 2 3 & 4 All
	450/4v2
		Left	Right
Four-Channel System Amplifier				  
		Left Output Right Output	Bridged: 300W x 1 (3-8Ω)

CH 1 & 2 Bass Control

Bass EQ	Infrasonic Filter
Off On		Off 30Hz
		Either
		feature
		sums the
		CH 1&2 input
		signals to
		mono when
		activated.
Remote
Bass Port

CH 1 & 2 Filter Section

Freq. Range Filter Mode Slope

	x1 x10 Off 12dB 24dB
	95	Filter Type
75	130
60	200
50	500 LP BP HP

Filter Freq. (Hz)

CH 1 & 2 Input Section

Input Voltage	Input Sens.
Low High
		Input Mode
		2ch 4ch
CH 1	CH 2	1 & 2	1 & 2
		Inputs	and
(Left)	(Right)	Only	3 & 4

CH 3 & 4 Filter Section

Freq. Range High-Pass Filter

x1 x10 Off 12dB 24dB

	95	Also sets
75	130
		low-pass
60		cutoff for
	200 CH 1 & 2
		Bandpass
50	500	Filter
		(if selected)

HP Filter Freq. (Hz)

CH 3 & 4 Input Section

Input Voltage	Input Sens.
Low High
CH 3	CH 4
(Left)	(Right)

CH 3 & 4 Speaker Outputs

LeftRight


  

Bridged: 150W x 1 (3-8Ω)

Left and Right	Jack for	Selects CH 1&2	CH 1&2	Selects	Selects CH 3&4	CH 3&4
Preamp Output Jacks	Remote Bass	HP or LP Cutoff	Left and Right	2ch / 4ch	High-Pass Cutoff	Left and Right
(pg. 10)	Control Knob	Frequency or HP Cutoff	Input Jacks	Input Mode	Frequency and Low-Pass	Input Jacks
	(pg. 11)	of Bandpass Filter	(pg. 7)	(pg. 7)	Cutoff for CH 1&2 Bandpass	(pg. 7)
		(pg. 8)			Filter
					(pg. 10)

2 JL Audio - 450/4v2 Owner’s Manual 3