Bedienungsanleitung JL Audio MHD900 (Seite 11 von 24) (Englisch)

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channel filter is a low-pass filter (attenuates

high frequencies). For each filter, the user can

select from a shallow (12dB/octave) filter slope

or a more aggressive (24dB/octave) slope.

1) “High-Pass Filter” Controls (Front and Rear

channels) or “Low-Pass Filter” Control (Sub

Channel): These switches allow you to select filter

slopes or defeat the filter(s) completely.

“Off”: Defeats the filter completely. Useful when

using an external crossover, such as one built into

a head unit or signal processor.

“12dB”: Configures the filter to attenuate

frequencies above or below the selected

filter frequency at a rate of 12 dB per octave

(Butterworth alignment).

“24dB”: Configures the filter to attenuate

frequencies above or below the selected filter

frequency at a rate of 24 dB per octave (Linkwitz-

Riley alignment).

Depending on the speaker system and the

vessel, different filter slopes may be required to

produce a smooth transition between the sound

of different speakers in the system.

In high-pass mode, the sharper “24dB” setting

will do a better job of protecting small speakers

with limited power handling. In low-pass

mode, the “24dB” setting can also help by more

aggressively removing lower midrange output

from a subwoofer system.

The shallower “12dB” octave setting

allows for more output overlap between

the speakers being crossed over. In many

cases, this will result in a smoother “blend”

or transition between speaker systems.

Experiment to find the slope or combination

of slopes which best matches the acoustic

requirements of your system.

2) “Filter Freq. (Hz)” Control:

This control selects the frequency at which the

filter begins to attenuate the signal and refers

specifically to the frequency at which output

has been attenuated by -3dB.

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 charts

in Appendix B (page 18) of this manual.

“80 Hz” is a good starting point for most systems

where a subwoofer is connected to the Subwoofer

Channel and component systems or coaxials to

the four main channels.

INFRASONIC FILTER Subwoofer Ch. Only)

The “Infrasonic Filter” is a 24 dB/octave high-

pass filter, with a fixed cutoff frequency of 30 Hz.

This filter is designed to conserve amplifier power

and protect subwoofer systems, without audibly

degrading the sub-bass output.

With ported enclosures, the use of the

“Infrasonic Filter” is highly recommended to

protect the speaker(s) from excessive excursion

below box tuning.

With sealed enclosures, the use of the filter

is less necessary, but can still help protect the

speaker system from excessive excursion.

The “Infrasonic Filter” can be completely

defeated by selecting the “Off” position on its

switch. This bypasses all signal from flowing

through the circuit.

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