Bedienungsanleitung JL Audio 3v2 (Seite 8 von 20) (Englisch)

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8 | JL Audio - XD500/3v2 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 XD500/3v2 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.

3 Channel Amplifier

Rem.

Oset

Signal

Input Voltage

Low

High

Turn-On Mode

1) “Filter Mode” Controls: The XD500/3v2

employs 12dB per octave filters for each pair of

main channels (one high-pass filter for channels

1&2 and another high-pass / bandpass filter for

channels 3&4. The subwoofer channel provides

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” switches 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 from 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.

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