Manual JL Audio XD600 (page 8 of 20) (English)

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8 | JL Audio - XD600/1v2 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 low-pass filter built into the

XD600/1v2 is designed to attenuate frequencies

above its filter frequency, so that the system’s

subwoofers do not reproduce any audible

midrange content.

This serves to improve tonal balance and

to avoid distortion. Correct use of the filter

can substantially improve the fidelity of your

audio system.

2) LP Filter Operation: The low-pass filter in the

XD600/1v2 is fully variable between 50 Hz and

500 Hz via the “Filter Freq.” control knob (80

Hz is a good starting point for tuning most

systems). The filter also features the ability to

select between a moderate “12dB” per octave

or a steep “24dB” per octave slope via the “LP

Filter Mode/Slope” switch.

Depending on the subwoofer system and

the vehicle, different slopes may be required

to produce a smooth transition to the mid-

bass speakers in the system. Experiment to

find the slope which best matches the acoustic

requirements of your system.

Tuning Hint: A trunk mounted sub whose

output has to “fight” through a rear deck or a

back seat often benefits from the 12 dB/octave

slope which lets more upper bass content pass

through. A sub that fires directly into the

listening environment is more likely to benefit

from a 24 dB/octave slope.

Note: The above hint is not ‘set-in-stone”… You

should always listen to the system carefully to

determine the best choice as vehicle acoustics and

other factors play a big role in choosing the most

appropriate filter slope.

3) Precise Frequency Selection: The filter

frequency markings on the front panel of

the amplifier are for reference purposes and

are generally accurate to within 1/3 octave

or better. If you would like to select the filter

frequency with a higher level of precision,

consult Appendix B (page 13) of this manual.

This chart gives you a more accurate frequency

for each of the forty detented positions of the

frequency selection control. This method can

be very useful if the amplifier is mounted in

a location where you can’t see the front panel

markings easily.

4) Defeating the LP Filter: The Low-Pass filter

can also be defeated completely, by switching

the “LP Filter Mode/Slope” switch to the

“Off” position. This is useful if you are using

an external active crossover in the system.

With the internal crossover turned off, the

XD600/1v2’s upper frequency response limit is

500 Hz, due to its subwoofer-specific design.

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JL Audio XD600 Manual

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