Bedienungsanleitung JL Audio A4300 (Seite 6 von 11) (Englisch)

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SYSTEM CONFIGURATIONS

The A4300 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

drawing on pages 18 & 19 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 A4300 can be configured to drive a bi-

amplified system by itself or with a separate

subwoofer amplifier.

Bi-Amplified System with one A4300

In this configuration, channels 3&4 of the

A4300 will drive subwoofers (stereo or bridged)

with low-pass filtering. Channels 1&2 will

drive component speakers in stereo with

high-pass filtering.

Input connection options for a bi-amplified system

with one A4300 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 “CH 1 (Left)”

and“CH 2 (Right)” inputs of the A4300 (select

“1&2” on the “CH 3&4 Input From” switch.

Res ult: the relative level of the LF and HF

channels will be determined by the A4300’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 two

pairs of stereo outputs.

Inp ut Connections: the first stereo pair source

unit outputs is connected to the “CH 1 (Left)”

and “CH 2 (Right)” inputs of the A4300. The

second stereo pair of source unit outputs is

connected to the “CH 3 (Left)” and “CH 4

(Right)” inputs (select “Discrete” on the “CH

3&4 Input From” switch).

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

one pair of stereo outputs and dedicated

subwoofer outputs.

Inp ut Connections: the main stereo pair of

source unit outputs is connected to the “CH

1 (Left)” and “CH 2 (Right)” inputs of the

A4300. The source unit’s dedicated subwoofer

output is connected to the “CH 3 (Left)” and

“CH 4 (Right)” inputs (select “Discrete” on

the “CH 3&4 Input From” switch).

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

control the absolute level of the LF channels

relative to the HF channels.

Set the “Input Sens.” in the “Channel 3 &

4 Controls” section with the source unit’s

subwoofer level control set at 3/4 of full output.

See Appendix A (page 14) for details.

Crossover Setup for Bi-Amplified System

with one A4300:

Once the input sections have been configured

appropriately, go to the “Channel 3 & 4

Controls”. Select “LP” (low-pass) on the “Filter

Mode” switch and an appropriate “Filter Freq.”

(80 Hz is a good starting point).

JL AUDIO A4300 11

AMPLIFIER STATUS INDICATOR LIGHTS &

PROTECTION CIRCUITRY

There are two status indicator lights on the

input / control end of the amplifier.

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

amplifier is turned on and operating normally.

2) “Protect” (Red): Indicates that the amplifier

protection circuitry has been activated to

prevent product failure due to a short-circuit

or a dangerously low impedance connected

to the amplifier output(s). Connecting the

speaker outputs to an impedance lower than

2 ohms stereo (4 ohms bridged) will cause

this protection mode to activate. When this

protection mode is activated, the amplifier will

reduce it maximum power output to protect its

circuitry, which will manifest itself as increased

distortion. When the problem is corrected, the

amplifier will return to normal operation.

Advanced Rollback Thermal protection

Unlike conventional thermal protection

systems, which shut down an amplifier when it

overheats, this system protects the amplifier by

gradually reducing power output if the amplifier’s

safe operating temperature is exceeded. The

amplifier will continue to operate and return

to normal power output once its temperature

returns to a normal range.

Low-Voltage protection:

If the car’s supply voltage drops below 10

volts, the entire amplifier will shut itself off to

protect its internal circuitry. The green “Power”

indicator 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,

turn your audio system off and have your power

wiring, ground connections and charging

system inspected.

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

10 JL AUDIO A4300

JL Audio A4300 Seite 6

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