Bedienungsanleitung JL Audio M200 (Seite 8 von 20) (Englisch)

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8 | JL Audio - XD200/2 Owner’s Manual

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 the M200/2 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 this filter can substantially increase the

longevity and fidelity of your audio system.

1) “Filter Mode” Control: The M200/2 employs a

12dB per octave filter which can be configured

as a high-pass or low-pass filter type, or

defeated completely by way of the three-

position “Filter Mode” switch:

“Off”: Defeats the filter completely, allowing

the full range of frequencies present at the

inputs to feed the amplifier. This is useful for

systems utilizing outboard active crossovers or

requiring full-range reproduction from one or

more of the M200/2’s channel pairs.

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

attenuate frequencies above the selected filter

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

useful for connection of subwoofer(s) to the

M200/2 in a bi-amplified system.

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

attenuate frequencies below the selected filter

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

useful for connection of component speakers to

the M200/2 in a bi-amplified system.

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

markings surrounding this rotary control

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 13).

Tuning Hint: If you are using the M200/2

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 12), you

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

achieve the desired system frequency response.

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