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10 | JL Audio - HD600/4 Owner’s Manual

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 HD600/4 has two individual filters,

one for the “Front” channels and the

other for the “Rear” channels. Each 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.

Each Channel Control section contains

identical crossover filter controls.

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

to configure the filter for that Channel Pair

into one of two filter types.

“Off”: Defeats the filter completely, allowing

the full range of frequencies present at the

inputs to feed that pair of channels. This

is useful for systems utilizing outboard

crossovers or requiring full-range reproduction

from that pair of channels.

“HP” (High-Pass): Configures the

CH 1&2 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.

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.

“Input Voltage” Switch

A wide range of signal input voltages can

be accommodated by each of the HD600/4’s

differential-balanced inputs (200mV – 8V RMS).

This wide range is split up into two sub-ranges,

accessible via the “Input Voltage” switches located

in each input section of the amplifier. Be aware

that each input section’s “Input Voltage” switch

will have to be configured, regardless of how many

input cables are actually feeding the amplifier.

The “Low” position on each “Input

Voltage” switch selects an input sensitivity

range between 200mV and 2V. This means that

the “Input Sens.” rotary control will operate

within that voltage window. If you are using

an aftermarket source unit, with preamp-level

outputs, this is most likely the position that

you will use (regardless of what voltage output

capability is claimed by the source unit).

The “High” position on each “Input Voltage”

switch selects an input sensitivity range between

800mV and 8V. This is for use with speaker-level

outputs from source units and small amplifiers

found in many OEM (factory-installed) systems.

To use speaker-level sources, splice the speaker

output wires of the source unit or small amplifier

onto a pair of RCA plugs for each input pair

or use the JL Audio ECS Speaker Wire to RCA

adaptor (XB-CLRAIC2-SW).

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 next to the “Input Voltage” switch

in each input section 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 each pair of amplifier channels 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 of each channel pair by adjusting

the input sensitivity downward on either or both

channel pairs, if they require 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.

Be aware that both “Input Sens.” adjustments

will have to be made, regardless of how many

input cables are feeding the amplifier. These

controls will allow you to set the appropriate

relative levels for the “Front” channels relative

to the “Rear” channels and any other amplifier

channels in the system.

JL Audio 4 Seite 6

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