Bedienungsanleitung JL Audio A4300 (Seite 7 von 11) (Englisch)

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D) Front to Rear HF Fading and Subwoofer

Level Control:

Req uired: a source unit or processor with

front and rear pairs of stereo outputs plus a

dedicated subwoofer output.

Inp ut Connections: one stereo pair of 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 of the A4300

(select “Discrete” on the “CH 3&4 Input

From” switch). The source unit’s dedicated

subwoofer output is connected to the

subwoofer amplifier inputs.

Res ult: with this option, the user has the ability to

fade the front and rear HF channels relative to

each other and also has the ability to control

the absolute level of the subwoofer channel

relative to the HF channels.

Set the subwoofer amplifier’s “Input Sens.”

with the source unit’s subwoofer level control

set at 3/4 of full output.

Crossover Setup for Bi-Amplified System with

one A4300 and a separate subwoofer amplifier:

Once the input and preamp output sections

have been configured appropriately, go to the

“Channel 1 & 2 Controls” and “Channel 3 &

4 Controls” You will set both control sections

identically to start:

Select “HP” (high-pass) on the “Filter Mode”

switch and an appropriate “Filter Freq.” (80 Hz is

a good starting point). Make these adjustments to

both control sections.

After proper adjustment of the A4300’s

“Input Sens.” controls, and the subwoofer

amplifier’s input sensitivity controls, you can fine

tune filter frequencies and attenuate either pair

of channels to achieve proper balance. For proper

adjustment of the “Input Sens.” controls of the

A4300 use the method shown in Appendix A

(page 14). For precise filter frequency information

for the A4300 refer to Appendix B (page 15).

Refer to the subwoofer owner’s manual for

proper adjustments.

JL AUDIO A4300 13

Next, turn your attention to the “Channel 1 &

2 Controls” and select “HP” (high-pass) on the

“Filter Mode” switch and an appropriate “Filter

Freq.” (again, 80 Hz is a good starting point).

After proper adjustment of the “Input Sens.”

controls for both channel pairs using the method

shown in Appendix A (page 14), you can fine

tune filter frequencies and attenuate either pair

of channels to achieve proper balance. For precise

filter frequency information refer to Appendix B

(page 15).

Bi-Amplified System with one A4300 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 amplifiers have this feature.

In this configuration, channels 1&2 of the A4300

will drive front component speakerswith high-

pass filtering. Channels 3&4 will drive

rear component speakers in stereo, also with

high-pass filtering. The separate amplifier

will drive the subwoofer system with low-pass

filtering (80 Hz is a good starting point).

Input connection options for a bi-amplified

system with one A4300 and a separate subwoofer

amplifier 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 is 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).

Connect the subwoofer amplifier inputs to

the preamp outputs of the A4300 (Select

“1&2” on the “Pre-Outs Input From” switch.

Alternatively, the A4300 can receive its input

from the subwoofer amplifier’s preamp output

set to “full-range” mode (if applicable).

Res ult: the relative level of the LF and front

and rear HF channels will be fixed by the

A4300’s “Input Sens.” settings (as well as the

subwoofer amplifier’s 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 stereo outputs.

Inp ut Connections: one stereo pair of source

unit outputs is 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). The second stereo pair of source

unit outputs is connected to the subwoofer

amplifier inputs.

Res ult: 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 A4300’s

“Input Sens.” settings and will not be user

adjustable from the front of the vehicle.

C) Subwoofer Level Control Only:

Req uired: a source unit or processor with left,

right 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 (select “1&2” on the “CH 3&4

Input From” switch). The source unit’s

dedicated subwoofer output is connected to

the subwoofer amplifier inputs.

Res ult: with this option, the user has the ability

to control the absolute level of the subwoofer

channel relative to the HF channels, but

cannot fade the front and rear HF channels

relative to each other.

Set the subwoofer amplifier’s “Input Sens.”

with the source unit’s subwoofer level control

set at 3/4 of full output.

12 JL AUDIO A4300

JL Audio A4300 Seite 7

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