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8 | JL Audio - XD1200/1v2 Owner’s Manual

ENGLISH

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

XD1000/1v2’s upper frequency response limit is

500 Hz, due to its subwoofer-specific design.

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.

REMOTE LEVEL CONTROL OPTIONAL

With the addition of the optional Remote

Level Control (HD-RLC), you can control the

subwoofer volume from the front of the vehicle

The HD-RLC connects to the jack labeled

“Remote Level Control” on the Connection

Panel of the amplifier using a standard telephone

cable (supplied with the HD-RLC). If desired,

multiple XD (and HD) amplifiers can be

controlled from a single HD-RLC controller

using a single-line, four-wire phone line splitter

and multiple phone cables.

When connected to the amplifier, the

HD-RLC operates as follows: At full counter-

clockwise rotation, the audio will mute

completely. At full clockwise rotation the level

will be the same as if the HD-RLC was not

connected at all. In other words, it operates

strictly as a level attenuator.

INPUT SENSITIVITY CONTROLS

The control labeled “Input Sens.” can be used

to match the source unit’s output voltage to the

input stage of the XD1000/1v2 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 A (page

) in this manual. After using this procedure,

you can then adjust the “Input Sens.” levels

downward if this is required to achieve the

desired system balance.

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 12).

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 low-pass filter built into the

XD1000/1v2 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

XD1000/1v2 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

backseat 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.

JL Audio 1v2 Seite 5

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