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10 | JL Audio - HD1200/1 Owner’s Manual

2) “Filter Slope” Control: This switch allows you

to select from two filter slopes:

“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

vehicle, 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.

3) “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.

INFRASONIC FILTER

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.

The output of the amplifier decreases for a

given input voltage when the “Input Range”

switch is placed in the “High” position. The

output increases with the switch in the “Low”

position. While this may sound counter-

intuitive, it is correct as described.

“Input Sens.” Control

Located to the left of the “Input Voltage”

switch is a rotary control labeled “Input Sens.”.

Once the appropriate “Input Voltage” range has

been selected, this control can be used to match

the source unit’s output voltage to the input stage

of each pair of amplifier channels for maximum

clean output. Rotating the control clockwise will

result in higher sensitivity (louder for a given

input voltage). Rotating the control counter-

clockwise will result in lower sensitivity (quieter

for a given input voltage). To properly set the

amplifier for maximum clean output, please refer

to Appendix C (pages 18, 19) in this manual.

After using this procedure, you can then adjust

the relative level by adjusting the input sensitivity

downward, if it requires attenuation to achieve

the desired system balance.

Do not increase the “Input Sens.” setting for

any amplifier in the system beyond the maximum

level established during the procedure outlined in

Appendix C (pages 18, 19). Doing so will result in

audible distortion and possible speaker damage.

CROSSOVER CONTROLS

Crossovers are groups of electronic filters

designed to control the frequency ranges

that each speaker in a system will be tasked

with reproducing. Proper crossover setup is

critical to sound quality and reliability.

The HD1200/1 has one filter, which can be

configured as a high-pass filter (attenuates low

frequencies) or as a low-pass filter (attenuates

high frequencies). Additionally, the user can

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

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

1) “Filter Mode” Control: this switch allows you

to defeat or configure the filter into one of two

filter types:

“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 crossovers or

requiring full-range reproduction.

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

to attenuate frequencies below the selected

filter frequency. Useful for connection of

component speakers in a bi-amplified system.

“LP” (Low-Pass): Attenuates frequencies

above the selected filter frequency.

Useful for connection of subwoofer(s)

in a bi-amplified system.

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