Bedienungsanleitung JL Audio XD400 (Seite 13 von 20) (Englisch)

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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).

MULTIAMPLIFIER SYSTEMS

Using the “Preamp Outputs” of the

XD400/4v2, it is easy to configure many

different multi-amplifier systems.

The most common type involves the

addition of a subwoofer amplifier, such as

the XD600/1v2. Common configurations

of such a system are described below.

Bi-Amplified System with one XD400/4v2 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 amplifiers have this feature.)

In this configuration, channels 1&2 of the

XD400/4v2 will drive front component speakers

in stereo with 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).

Here are three possible configuration options:

A) 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 XD400/4v2

(select “2 Ch.” on the “Input Mode” 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 XD400/4v2’s “Input Sens.”

settings and will not be user adjustable from

the front of the vehicle.

B) 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 XD400/4v2 (select “2 Ch.” on the “Input

Mode” 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.

C) 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 XD400/4v2.

The second stereo pair of source unit outputs

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

4 (Right)” inputs of the XD400/4v2 (select

“4 Ch.” on the “Input Mode” switch). The

source unit’s dedicated subwoofer output is

connected to the subwoofer amplifier inputs.

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