Bedienungsanleitung JL Audio 1000 (Seite 5 von 13) (Englisch)

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This is completely independent of the amplifier’s

internal filter and allows the user to match, stagger

or overlap the subwoofer low-pass filter frequency

of the amplifier crossover with the output filter’s

frequency for precise control and optimized

midbass performance.

If you would like to select the filter frequency

with a higher level of precision, consult

Appendix A: Chart A-2 (page 12) of this manual.

The signal level of the “Preamp Output” is

affected by the setting of the “Input Voltage Range”

switch (of the input section chosen by the

“Signal From” switch). See Appendix B (page 14)

for details on “Input Voltage” settings. All “slave”

amplifiers should get this switch set to “Low”.

See Appendix C (page 16) for details.

ADVANCED BASS CONTROL SECTION

The 1000/1 includes a versitile bass processing

section consisting of two primary components: a

fully variable, 24 dB per octave infrasonic filter and a

parametric, single-band equalizer.

1) “Infrasonic Filter”: The infrasonic filter is a

24 dB/octave high-pass filter, with a fully variable

cutoff frequency between 15 - 60 Hz.When set at

frequencies lower than 30 Hz, it conserves amplifier

power without audibly affecting the quality of the

sub-bass output. If set at frequencies higher that

30 Hz, there will be an audible effect, but one which

may be desirable for SPL competition purposes or

curve shaping of a bottom-heavy system.

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.

CAUTION

If you would like to select the infrasonic filter

frequency with a higher level of precision, consult

Appendix A: Chart A-3 (page 13) of this manual.

The infrasonic filter can be completely defeated

by selecting the “Off” position on the “Mode”

switch.This bypasses all signal from flowing

through the circuit.

2) Parametric Bass Equalizer: The parametric

equalizer allows the used to select the center

frequency of the boost band as well as the

bandwidth (“Q”) of the boost band.

The “Q" control selects the bandwidth of the

boost around the center frequency. Lower numbers

pertain to wider bandwidths while higher number

pertain to narrower bandwidths.

The “Center Freq.” control selects the center

frequency of the boost bandwidth within a range of

20 - 80 Hz. If you would like to select the filter

frequency with a higher level of precision, consult

Appendix A: Chart A-4 (page 13) of this manual.

The “Boost” control determines how much

boost (in dB) you are adding to the bass signal.

A range of 0 - 15dB of boost is available.

The “Remote Bass Port” allows the connection

of an optional remote boost knob (the RBC-1)

that can be mounted in the front of the vehicle.

This optional control takes the place of the

“Boost” knob on the amplifier when connected

and bypasses the “Boost” control on the amplifier.

The “Advanced Bass Control” section will only

operate when the amplifier's filter is activated with

the “Amp LP Filter” switch in the “12dB” or

“24dB” position. It will not work with this switch in

the “Off” position.This is to prevent cascading the

processing of multiple amplifiers when configured

in a master/slave arrangement as shown in

Appendix C (page 16). If you are using an external

active crossover and would like to use the

“Advanced Bass Control” features, set the

“Amp LP Filter” switch on “12dB” and rotate the

frequency selection knob fully clockwise to the

“200 Hz” position.This will activate the “LF Boost”

and “Infrasonic Filter” controls without significantly

affecting the crossover point selected by the

external active crossover.

IMPORTANT

JL AUDIO 1000/1 9

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.

2) 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 A:

Chart A-1 (page 12) 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.

3) Defeating the Amplifier Filter: The Low-

Pass filter can also be defeated completely, by

switching the “Mode/Slope” switch to the “Off”

position.This is useful if you are using an external

active crossover in the system. Keep in mind that

turning the internal crossover off also defeats the

“Advanced Bass Control” section processing

(see page 9 for details).With the internal

crossover turned off, the 1000/1’s upper

frequency response limit is 250 Hz, due to its

bass-specific Class D design.

PREAMP OUTPUT SECTION

The 1000/1 incorporates a flexible preamp

output section, designed to make multiple amplifier

systems easy to set up.

The Preamp output can be configured in three

different “Output Modes”:

1) “Full-Range”: This is a pass-through mode

for the preamp output, delivering the same signal

that is being fed to the “Amplifier Input Section”

(If the input signal is full-range, the preamp output

will be full-range).This signal is not affected by the

“Advanced Bass Control” processing selected

for the amplifier.

2) “Amp Filter”: The preamp output delivers

the same signal that is feeding the 1000/1’s

amplifier section, including all the processing

induced by the “Amp LP Filter” and “Advanced

Bass Control” sections. This is primarily used for

running additional 1000/1’s in a “Slave”

configuration from the “Master” amplifier. For

detailed information on Master/Slave

configurations, see Appendix C (page 16). If the

“Output Mode” switch is in the “Amp Filter”

position and the “Amp LP Filter” switch is in the

“Off” position, there will be no output from the

preamp output jacks.The independent output filter

controls (“Filter Slope”, “Filter Freq” and “Filter

Mode”) are inactive in “Amp Filter” mode.

3) “Out Filter”: The preamp output is filtered by

a fully variable, active filter incorporated into the

output section and is not affected by the bass

control processing selected for the amplifier.

In “Out Filter” mode, the user can select:

a) High-pass (“HP”) or low-pass (“LP”) filtering by

way of the “Filter Mode” switch.

b) 12 dB/octave or 24 dB/ octave filter slope by way

of the “Filter Slope” switch.

c) A filter cutoff frequency between 40 - 200 Hz for

the preamp output signal by way of the “Filter

Control” switch.

8 JL AUDIO 1000/1

JL Audio 1000 Seite 5

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