Bedienungsanleitung JL Audio 1200 (Seite 5 von 13) (Englisch)

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8 | JL Audio - 1200/1v3 Owner’s Manual

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 C: Chart A-1 (page 16)

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 10 for

details). With the internal crossover turned

off, the 1200/1v3’s upper frequency response

limit is 250 Hz, due to its bass-specific

Class D design.

PREAMP OUTPUT SECTION

The 1200/1v3 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”:

+12VDC Ground Remote

Low/High

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 1200/1v3’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

1200/1v3’s in a “Slave” configuration from the

“Master” amplifier. For detailed information on

“Master/Slave” configurations, see Appendix

D (page 18). 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.

IMPORTANT

The output of the amplifier will decrease

for a given input voltage when the “Input

Range” switch is placed in the “High” position.

Conversely, the output will be higher with

the switch in the “Low” position. While this

may sound counter-intuitive, it is correct

as described.

3) Input Sensitivity Adjustment: Located

next to the “Input Voltage” switch, in the

“Amplifier Input Section”, is a rotary control

labeled “Input Sens.”. Once the appropriate

“Input Voltage” range has been selected, this

rotary control can be used to match the source

unit’s output voltage to the input stage of the

amplifier 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 14) in this manual. After

using this procedure, you can then adjust

the level of the amplifier by adjusting the

input sensitivity downward, if the amplifier

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 A (page

14). Doing so will result in audible distortion

and possible speaker damage.

CROSSOVER CONTROLS

Crossovers are groups of individual electronic

filters which allow only certain frequency

ranges to pass through them by attenuating

frequencies outside the selected range. These

filters allow the user to specify what frequency

range will be sent out of each channel section

of the amplifier. This, in turn, allows each

speaker system to only reproduce a range of

frequencies it is well-suited for, resulting in

reduced distortion and improved fidelity.

AMPLIFIER LOWPASS FILTER

The 1200/1v3 employs a sophisticated, state-

variable, low-pass active filter for its internal

channel. This feature is designed to attenuate

frequencies above its filter frequency, so that the

system’s subwoofers do not reproduce any audible

midrange content.

+12VDC Ground Remote Preamp Output Section

Infrasonic Filter

“Q” Center Freq. Boost (dB)

Amp LP Filter

Advanced

Bass

Control

Amplifier Input Section

Subwoofer Output

MONO OUTPUT ONLY

Left Output Right Output Left Ch. Right Ch.Filter Freq. (Hz)

Filter Freq. (Hz)

Infrasonic Freq. (Hz) Remote Bass Port

Full Range

Amp Filter

Out Filter

Output Mode Filter Slope Mode

Mode

Slope

Input Voltage Input Sens. Signal Sensing

12dB

24dB

Filter Mode

Bass EQ

Off

12dB

24dB Low

High Off

OnOff

100

200 15

100

200

0.5

0.7

1.1

1.6

2.7

4.3

80 0

+10

+13

+15

Monoblock Subwoofer Amplifier

1) Filter Operation: The low-pass filter in the

1200/1v3 is fully variable between 40 Hz and

200 Hz via the “Filter Freq.” control knob

and features the ability to select between a

moderate “12dB” per octave or a steep “24dB”

per octave slope via the “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 back seat

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.

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.

JL Audio 1200 Seite 5

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