Manual JL Audio 4v3 (page 6 of 13) (English)

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10 | JL Audio - 300/4v3 Owner’s Manual

SYSTEM CONFIGURATIONS

The 300/4v3 is a 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 Page 22 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 300/4v3 can be configured to drive a

bi-amplified system by itself or with a separate

subwoofer amplifier.

Bi-Amplified System With One 300/4v3

In this configuration, the rear channels of the

300/4v3 will drive subwoofers (stereo 75W x 2 or

bridged 150W x 1) with low-pass filtering. The

front channels will drive component speakers in

stereo (75W x 2) with high-pass filtering.

Input connection options for a bi-amplified system

with one 300/4 v2 are as follows:

A) No User Adjustability:

Req uired: a basic source unit or processor with

one pair of stereo outputs.

Inp ut Connections: a single pair of stereo

source unit outputs connected to the

front channel inputs of the 300/4v3

(select “2ch” on the “Input Mode”

switch in the “Front Input Section”).

Res ult: the relative level of the LF and HF

channels will be fixed by the 300/4v3’s “Input

Sens.” settings and will not be user adjustable

from the front of the vehicle.

B) Fade Subwoofer Level vs. HF Level

Req uired: a source unit or processor with front

and rear pairs of outputs.

Inp ut Connections: the first stereo pair of source

unit outputs is connected to the front inputs

of the 300/4v3. The second stereo pair of

source unit outputs is connected to the rear

inputs (select “4ch” on the “Input Mode”

switch in the “Front Input Section”).

Res ult: 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

amplifier section’s “Input Sens.” controls.

C) Subwoofer Level Control Only

Req uired: a source unit or processor with left,

right and subwoofer outputs.

Inp ut Connections: the main stereo pair of

source unit outputs is connected to the front

inputs of the 300/4v3. The source unit’s

dedicated subwoofer output is connected to

the rear inputs (select “4ch” on the “Input

Mode” switch in the “Front Input Section”).

Res ult: in this mode, the user has the ability to

control the absolute level of the LF channels

relative to the HF channels.

IMPORTANT

Set the rear channel “Input Sens.” with the

source unit’s subwoofer level control set at

3/4 of full output. See Appendix A (page 14)

for details.

STATUS INDICATOR LIGHTS /

PROTECTION CIRCUITRY

There are three status indicator lights on the

top of the amplifier. These are as follows:

1) “ Power” (Green): lights to indicate that the

amplifier is turned on and operating normally.

2) “ Thermal” (Red): lights to indicate that

the amplifier has exceeded its safe operating

temperature, putting the amplifier into a self-

protection mode, which reduces the power

output of the amplifier. The red light will shut

off and the amplifier will return to normal,

full-power operating mode if the heat sink

temperature drops back to a safe level.

3) “Low Ω” (Amber): lights to indicate that the

impedance of the speaker load connected to

the amplifier is lower than the optimum load

impedance range for the amplifier. When this

light is on, a protection circuit engages and

reduces the power output of the amplifier.

The amber indicator will also light when a

short-circuit is detected in the speaker wiring

(this can be a short between the positive and

negative speaker wires or between either

speaker wire and the vehicle chassis).

There is only one condition that will shut down

an undamaged 300/4v3 completely… If battery

voltage drops below 10 volts, the entire amplifier

will shut itself off. The green “Power” indicator

on the top of the amplifier will turn off when this

occurs. The amplifier will turn back on when

voltage climbs back above 10 volts. This may

happen in a rapid cycle when bass-heavy program

material causes a weak charging system to dip

below 10 volts momentarily. If this is happening

in your system, have your charging system

inspected to make sure it is working properly.

For information on troubleshooting this

amplifier, refer to Appendix E (page 20).

SERVICING YOUR JLAUDIO AMPLIFIER

If your amplifier fails or malfunctions, please

return it to your authorized JLAudio dealer so

that it may be sent in to JLAudio for service.

There are no user serviceable parts or fuses inside

the amplifier. The unique nature of the circuitry

in the JLAudio amplifiers requires specifically

trained service personnel. Do not attempt

to service the amplifier yourself or through

unauthorized repair facilities. This will not only

void the warranty, but may result in the creation

of more problems within the amplifier.

If you have any questions about the installation or

setup of the amplifier not covered in this manual,

please contact your dealer or technical support.

JLAudio Technical Support:

(954) 443-1100

9:00 AM – 5:30 PM (Eastern Time Zone)

Monday - Friday

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JL Audio 4v3 Manual

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