Bedienungsanleitung JL Audio M500 (Seite 8 von 20) (Englisch)

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8 | JL Audio - M500/3 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 each channel

section of the M500/3 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.

1) “Filter Mode” Controls: The M500/3 employs

a 12dB per octave high-pass filter for its main

channels. The Subwoofer Channel employs a

low-pass filter with the option of 12dB or 24dB

/ octave slopes. Each of these filters can be

controlled or defeated completely by way of the

“Filter Mode” switch in each Channel Section:

Channel 1 & 2 Filter: 2dB/octave High-Pass only

“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 for this

channel pair.

“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 this channel pair in a

bi-amplified system.

Subwoofer Channel Filter: 12dB/octave

or 24dB / octave, Low-Pass only

“Off”: Defeats the filter completely, allowing

the full range of frequencies present at the

inputs to feed this channel. This is useful for

systems utilizing outboard active crossovers.

“12dB” (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

in a bi-amplified system. This shallower slope

gently attenuates high-frequencies from your

subwoofer signal and is often well-suited for

sedans and coupes with trunks.

“24dB” (Low-Pass): Configures the filter

to attenuate frequencies above the indicated

filter frequency at a rate of 24dB per octave.

This is useful for connection of subwoofers

in a bi-amplified system. This sharper slope

more aggressively removes high-frequencies

from your subwoofer signal and is often well-

suited for SUV’s, wagons and hatchbacks.

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).

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JL Audio M500 Seite 8

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