JL Audio 450/4V2 Manual

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20 | JL Audio - 450/4v2 Owner’s Manual

C) Subwoofer Level Control Only

Req uired: a source unit or processor

with left, right and dedicated

subwoofer outputs is required.

Inp ut Connec tions: one stereo pair of source

unit outputs is connected to the CH 1&2

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iInput ModewTXJUDIJOUIFiCH 1&2 Input

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subwoofer output is connected to the

subwoofer amplifier inputs. In this mode, the

450/4v2’s preamp output is not used.

Res ult: the user has the ability to control the

absolute level of the subwoofer channel

relative to the MF and HF channels.

IMPORTANT

Set the subwoofer amplifier’s “Input

Sens.” with the source unit’s subwoofer

level control set at 3/4 of full output.

Refer to the subwoofer amplifier owner’s

manual for proper adjustment.

Crossover setup for tri-amplified 3.1 system with

one 450/4v2 and a separate subwoofer amplifier:

Once the input and preamp output sections have

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will determine the high-pass cutoff and slope of

the bandpass filtering applied to the MF (mid-

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RangewTXJUDIiBPwCBOEQBTTPOUIFiFilter

TypewTXJUDIBOEi12dBwPSi24dBwPOUIF

iFilter Mode/SlopewTXJUDIBOEBOBQQSPQSJBUF

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cannot be used in this mode.

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Input Sectionw5IFTFTFUUJOHTXJMMEFUFSNJOF

the high-pass cutoff and slope of the high pass

filtering applied to the HF (high-frequency)

channels as well as the low-pass cutoff frequency

and slope for the MF channels’ bandpass filter.

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desired MF to HF crossover frequency is below

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if your desired MF to HF crossover frequency

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iFilter TypewTXJUDIBOEi12dBwPSi24dBw

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After proper adjustment of the 450/4v2’s CH

1&2 and CH 3&4, and the subwoofer amplifier’s

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tune filter frequencies and slopes and attenuate

the LF, MF and HF channel pair or with the

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controls of the 450/4v2 use the method shown in

Appendix B (page 22). For precise filter frequency

information for the 450/4v2 refer to Appendix

A (page 22). Refer to the subwoofer amplifier

owner’s manual for proper adjustments.

TRIAMPLIFIED SYSTEMS

Tri-amplified systems are defined as systems

in which separate amplifier channels drive

low-frequency (LF), mid-frequency (MF) and

high-frequency (HF) speakers and are separately

filtered to send appropriate frequency ranges to

each speaker system.

The most common application of tri-

amplification in mobile audio is to drive a

subwoofer system from one or more amplifiers

or channels (LF channels), mid-range speakers

from a separate amplifier or set of channels

(MF channels) and high-frequency speakers

from a separate amplifier or set of channels

(HF channels). One such configuration is to

run subwoofers off the LF channel(s), mid-

bass speakers off the MF channels, and a

passively crossed over mid/high frequency

component speaker systems on the HF channels.

Another approach is to run subwoofers off the

LF channel(s), mid-woofers off the MF channels

and tweeters off the HF channels (all actively

crossed over).

By activating the CH 1&2 bandpass filter

feature, the 450/4v2 can easily be configured

to drive a tri-amplified system in conjunction

with a separate subwoofer amplifier that

includes a low-pass filter. CH 3&4 of the

450/1 will drive the HF speakers (75W x 2),

CH 1&2 will drive the MF speakers (150W

x 2) and the separate subwoofer amp(s)

will drive the LF speakers (subwoofers).

Input connection options for the Tri-Amplified

Stereo mode are as follows:

A) No User Adjustability

Req uired: a basic source unit or processor with

left and right stereo outputs.

Inp ut Connec tions: a single pair of stereo

source unit outputs is connected to the CH

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UIFiInput ModewTXJUDIJOUIFiCH 1&2

Input Sectionw4VCXPPGFSBNQMJGJFSJOQVUT

are connected to the preamp outputs of the

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TXJUDIJOUIFiPreamp Output Sectionw

Res ult: the relative level of all channels will be

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and will not be user adjustable from the front

of the vehicle.

B) Fade Subwoofer Level vs. MF/HF Level

Req uired: a source unit or processor with front

and rear pairs of outputs is required.

Inp ut Connec tions: one stereo pair of source

unit outputs is connected to the CH 1&2

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iInput ModewTXJUDIJOUIFiCH 1&2 Input

SectionwBOEUIFTFDPOETUFSFPQBJSPGTPVSDF

unit outputs is connected to the subwoofer

amplifier inputs. In this mode, the 450/4v2’s

preamp output is not used.

Res ult: the user has the ability to adjust the level

of the subwoofer channel relative to the mid

and high-frequency channels via the source

unit’s fader control, without exceeding the

maximum clean output level set by each

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