Bedienungsanleitung JL Audio A2150 (Seite 4 von 11) (Englisch)

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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 filter built into the A2150 can be

used to eliminate potentially harmful and/or

undesired frequencies from making their way

through the amplifier sections to the speaker(s).

This serves to improve tonal balance and to avoid

distortion and possible speaker failure. Correct

use of these filters can substantially increase the

longevity and fidelity of your audio system.

1) “Filter Mode” Control: The A2150 employs a

12dB per octave filter which can be configured

into one of two filter types or defeated

completely by way of the three-position “Filter

Mode” switch:

“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 from the

A2150’s channels.

“LP” (Low-Pass): Configures the filter to

attenuate frequencies above the selected filter

frequency at a rate of 12dB per octave. This is

useful for connection of subwoofer(s) to the

A2150’s in a bi-amplified system.

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

attenuate frequencies below the selected filter

frequency at a rate of 12dB per octave. This is

useful for connection of component speakers to

the A2150’s channels in a bi-amplified system.

2) “Filter Freq. (Hz)” 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

chart in Appendix B (page 13).

Tuning Hint: If you are using the A2150 to drive

a subwoofer system (“LP” mode), a component

satellite speaker system (“HP” mode) or both,

80 Hz is a good baseline “Filter Freq. (Hz)”

setting. After properly adjusting the “Input

Sens.”, as outlined in Appendix A (page 12), you

can fine tune the “Filter Freq. (Hz)” control to

achieve the desired system frequency response.

JL AUDIO A2150 7

INPUT SECTION

The A2150’s input section allows you to send

signal to the amplifier section through the use

of two differential-balanced inputs, one for

the left channel and one for the right channel.

Connection is via RCA-type jacks.

Input Voltage Range:

A wide range of signal input voltages can be

accommodated by the A2150’s input section

(200mV – 8V). This wide range is split up into

two sub-ranges, accessible via a switch located to

the left of the Input Connectors.

The “Low” position on the “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 or an OEM interface processor with

conventional preamp-level outputs, this is most

likely the position that you will use.

The “High” position on the “Input Voltage”

switch selects an input sensitivity range between

800mV and 8V. This is useful for certain high-

output preamp level signals as well as speaker-

level output from source units and

small amplifiers.

To use speaker-level sources, splice the speaker

output wires of the source unit or small amplifier

onto a pair of RCA plugs. No line output

converter is needed in most cases.

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 consistent with the

descriptions above.

INPUT SENSITIVITY CONTROL

Once the appropriate “Input Voltage” range

has been selected, the control labeled “Input

Sens.” located in the “Amplifier Controls”

section 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

12) in this manual. After using this procedure,

you can then adjust any or all “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.

6 JL AUDIO A2150

JL Audio A2150 Seite 4

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