Bedienungsanleitung JL Audio 300 (Seite 7 von 13) (Englisch)

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

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

front inputs of the 300/4v3 (select “2ch”

on the “InputMode” switch in the “Front

Input Section”). 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.

IMPORTANT

Set the subwoofer amplifier’s “Input Sens.”

with the source unit’s subwoofer level control

set at 3/4 of full output.

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 (front,

typically) of source unit outputs is connected

to the front inputs of the 300/4v3. The second

stereo pair of source unit outputs (rear,

typically) is connected to the rear inputs of

the 300/4v3 (select “4ch” on the “Input Mode”

switch in the “Front Input Section”). 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.

IMPORTANT

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

300/4v3 and a separate subwoofer amplifier:

Once the input and preamp output

sections have been configured appropriately,

go to the “Front Filter Controls” and

“Rear Filter Controls” You will set both

control sections identically to start:

Select “x1” on the “Freq. Range” switch, “HP”

(high-pass) on the “Filter Mode” switch and

“12dB” or “24dB” on the “Filter Slope” switch

and an appropriate “Filter Freq.” (80 - 90 Hz is a

good starting point). Select the same settings for

the “Rear Filter Controls”.

After proper adjustment of the 300/4v3’s

front and rear “Input Sens.” controls and the

subwoofer amplifier’s input sensitivity controls,

you can fine tune filter frequencies and slopes and

attenuate either pair of channels to achieve proper

balance. For proper adjustment of the “Input

Sens.” controls of the 300/4v3 use the method

shown in Appendix A (page 14). For precise filter

frequency information for the 300/4v3 refer to

Appendix D (page 18). Refer to the subwoofer

amplifier owner’s manual for proper adjustments.

Crossover Setup for Bi-Amplified System

with one 300/4v3:

Once the input sections have been configured

appropriately, go to the “Rear Filter Controls”.

Select “x1” on the “Freq. Range” switch, “LP”

(low-pass) on the “Filter Mode” switch and

“12dB” or “24dB” on the “Filter Slope” switch

and an appropriate “Filter Freq.” (80-90 Hz is a

good starting point).

Next, turn your attention to the “Front Filter

Controls” and select “x1” on the “Freq. Range”

switch, “HP” (high-pass) on the “Filter Type”

switch and “12dB” or “24dB” on the “Filter

Mode/Slope” switch and an appropriate “Filter

Freq.” (again, 80-90 Hz is a good starting point).

After proper adjustment of the front and rear

“Input Range” and “Input Sens.” controls using

the method shown in Appendix A (page 14), 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 D (page 18).

Bi-Amplified System with one 300/4v3 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, the front channels of

the 300/4v3 will drive front component speakers

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

channels will drive rear component speakers in

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

The separate amplifier will drive the subwoofer

system with low-pass filtering (select a filter

frequency of 80-90 Hz to start).

Input connection options for a bi-amplified

system with one 300/4v3 and a separate subwoofer

amplifier are as follows:

A) No User Adjustability:

Req uired: a basic source unit or processor with

left and right stereo outputs.

Inp ut Connections: a single pair of stereo

source unit outputs is connected to the

front inputs of the 300/4v3 (select “2ch”

on the “Input Mode” switch in the “Front

Input Section”) and also connected to the

subwoofer amplifier inputs via a pair of

“Y-Adaptors” like the JLAudio ECS model

XD-CLRAICY-1F2M. Alternatively, the

300/4v3 can receive its input from the

subwoofer amplifier’s preamp output set

to “full-range” mode.

Res ult: the relative level of the LF and front

and rear HF channels will be fixed by

the 300/4v3’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 front inputs of the

300/4v3 (select “2ch” on the “Input Mode”

switch in the “Front Input Section”). 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 300/4v3’s

“Input Sens.” settings and will not be user

adjustable from the front of the vehicle.

fading the signal to the subwoofer amplifier.

JL Audio 300 Seite 7

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