Bedienungsanleitung JL Audio XD400 (Seite 8 von 20) (Englisch)

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8 | JL Audio - XD400/4v2 Owner’s Manual

Do not increase any “Input Sens.” setting for

any channel(s) of any amplifier in the system

beyond the maximum level established during

the procedure outlined in Appendix A (page 14).

Doing so will result in audible distortion and

possible speaker damage.

FILTER CONTROLS

Most speakers are not designed to reproduce

the full range of frequencies audible by the human

ear. For this reason, most speaker systems are

comprised of multiple speakers, each dedicated

to reproducing a specific frequency range. Filters

are used to select which frequency range is sent

to each section of a speaker system. The division

of frequency ranges to different speakers can be

done with passive filters (coils and/or capacitors

between the amplifier outputs and the speakers),

which are acceptable and commonly used

for filtering between mid-range speakers and

tweeters. Filtering between subwoofer systems

and satellite speaker systems is best done with

active filters, which cut off frequency content at

the input to the amplifier. Active filters are more

stable than passive filters and do not introduce

extraneous resistance, which can degrade

subwoofer performance.

The active filter built into each channel section

of the XD400/4v2 can be used to eliminate

potentially harmful and/or undesired frequencies

from making their way through the amplifier

sections to the speaker(s). This serves to improve

tonal balance and to avoid distortion and possible

speaker failure. Correct use of these filters can

substantially increase the longevity and fidelity of

your audio system.

Input Mode

2 Ch.

4 Ch.

All

3&4

1&2

Sum

Preouts From Remote Level Mode

4 Channel Amplifier

Rem.

Oset

Signal

Input Voltage

Low

High

Turn-On Mode

1) “Filter Mode” Controls: The XD400/4v2

employs 12dB per octave filters for each

pair of channels. Each of these filters can be

controlled or defeated completely by way of the

three-position “Filter Mode” switches in each

Channel Section:

“Off”: Defeats the filter completely, allowing

the full range of frequencies present at the inputs

to feed these channels. This is useful for systems

utilizing outboard active crossovers or requiring

full-range reproduction from this channel pair.

“LP” (Low-Pass): Configures the filter to

attenuate frequencies above the indicated filter

frequency, at a rate of 12dB per octave. This

is useful for connection of subwoofers to one

or more of the XD400/4v2’s channel pairs in a

bi-amplified system.

“HP” (High-Pass): Configures the filter to

attenuate frequencies below the indicated filter

frequency at a rate of 12dB per octave. This is

useful for connection of component speakers

or coaxials to one or more of the XD400/4v2’s

channel pairs in a bi-amplified system.

2) “Filter Freq. (Hz)” The filter frequency

markings surrounding these rotary controls

(one in each Channel Section) are for reference

purposes and are generally accurate to within

1/3 octave or better. If you would like to select

the filter cutoff frequency with a higher level

of precision, consult the chart in Appendix B

(page 15).

Tuning Hint: If you are using the XD400/4v2

to drive a subwoofer system (“LP” mode), a

component satellite speaker system (“HP” mode)

or both, 80 Hz is a good baseline “Filter Freq.

(Hz)” setting. After properly adjusting the “Input

Sens.”, as outlined in Appendix A (page 14), you

can fine tune the “Filter Freq. (Hz)” control to

achieve the desired system frequency response.

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