System Configurations, BI-AMPLIFIED Systems

SYSTEM CONFIGURATIONS

The 450/4v2 is a very flexible amplifier, well- suited for a multitude of system configurations. In this section, the most likely configurations are explained in detail.

Once you have selected your desired configuration, you can use the amplifier panel drawings on the bottom of the following pages to mark the required switch positions for easy reference.

BI-AMPLIFIED SYSTEMS

Bi-amplified systems are defined as systems in which separate amplifier channels drive low- frequency (LF) and high-frequency (HF) speakers and are separately filtered to send appropriate frequency ranges to each speaker system.

The most common application of bi- amplification in mobile audio is to drive a subwoofer system from one or more amplifiers or channels and component speakers from separate amplifiers or channels.

The 450/4v2 can be configured to drive a bi-amplified system by itself or with a separate subwoofer amplifier.

Bi-Amplified System with one 450/4v2

In this configuration, CH 1&2 of the 450/4v2 will drive subwoofers (stereo 150W x 2 or bridged 300W x 1) with low-pass filtering. CH 3&4 will drive component speakers in stereo (75W x 2) with high-pass filtering.

Input connection options for a bi-amplified system with one 450/4v2 are as follows:

A)No User Adjustability

Required: a basic source unit or processor with left and right stereo outputs.

Input Connections: a single pair of stereo source unit outputs connected to the CH 1&2 inputs of

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Result: the relative level of the LF and HF

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from the front of the vehicle.

B)Fade Subwoofer Level vs. HF Level Required: a source unit or processor with front

and rear pairs of outputs.

Input Connections: the first stereo pair of source unit outputs is connected to the CH 1&2 inputs of the 450/4v2. The second stereo pair of source unit outputs is connected to the CH

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Result: in this mode, the user has the ability to fade or control the level of the LF channels relative to the HF channels via the source unit’s fader control without exceeding the maximum clean output level set by each

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C)Subwoofer Level Control Only

Required: a source unit or processor with left, right and subwoofer outputs.

Input Connections: the main stereo pair of source unit outputs is connected to the CH 3&4 inputs of the 450/4v2. The source unit’s dedicated subwoofer output is connected to the CH

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Result: in this mode, the user has the ability to control the absolute level of the LF channels relative to the HF channels.

! I M P O RTA N T

Set the CH 1&2 “Input Sens.” with the source unit’s subwoofer level control set at 3/4 of full output. See Appendix B (page 22) for details.

Crossover Setup for Bi-Amplified System with one 450/4v2:

Once the input sections have been

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point). You may also choose to activate the

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After proper adjustment of the CH

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shown in Appendix B (page 22), you can fine tune filter frequencies and slopes and attenuate either pair of channels to achieve proper balance. For precise filter frequency information refer to Appendix A (page 22).

Bi-Amplified System with one 450/4v2 in four-channel mode and a separate subwoofer amplifier

This configuration requires that the separate subwoofer amplifier has a built-in low-pass filter. All JL Audio subwoofer amplifiers have this feature.

In this configuration, CH 1&2 of the 450/4v2 will drive front component speakers (stereo 150W x 2) with high-pass filtering. CH 3&4 will drive rear component speakers in stereo (75W x 2) with high-pass filtering.

The separate amplifier will drive the subwoofer system with low-pass filtering (select a filter

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subwoofer amplifier may or may not be connected to the preamp outputs of the 450/4v2, depending on which connection option you choose.

Input connection options for a bi-amplifier system with one 450/4v2 and a separate subwoofer amplifier are as follows:

A)No User Adjustability

Required: a basic source unit or processor with left and right stereo outputs.

Input Connections: a single pair of stereo source unit outputs is connected to the CH 1&2

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inputs to the preamp outputs of the 450/4v2

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Result: the relative level of the LF and front and rear HF channels will be fixed by the 450/4v2’s

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adjustable from the front of the vehicle.

B)Fade Subwoofer Level vs. HF Level Required: a source unit or processor with front

and rear pairs of stereo outputs.

Input Connections: one stereo pair of source unit outputs is connected to the CH 1&2

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iInput ModewTXJUDIJOUIFiCH 1&2 Input Sectionw 5IFTFDPOETUFSFPQBJSPGTPVSDF unit outputs is connected to the subwoofer amplifier inputs. In this mode, the 450/4v2’s preamp output is not used.

Result: with this option, the user has the ability to fade the level of the subwoofer amplifier’s input relative to the HF channels, but cannot control front-to-rear fading of the HF channels. The relative level of the front and rear HF channels will be fixed by the 450/4v2’s iInput Sens.wTFUUJOHTBOEXJMMOPUCFVTFS adjustable from the front of the vehicle.

14 JL Audio - 450/4v2 Owner’s Manual