Bedienungsanleitung JL Audio A6450 (Seite 4 von 11) (Englisch)

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INPUT SENSITIVITY CONTROLS

Once the appropriate “Input Voltage” range

has been selected, the controls labeled “Input

Sens.” located in each “Channel Controls”

section 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 the amplifier for maximum

clean output, please refer to Appendix A (page

14) 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

14). 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 filter built into each channel section

of the A6450 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 A6450 employs a

12dB per octave filter for each pair of channels

(one filter for channels 1&2, another filter for

channels 3&4 and a third filter for channels

5&6). Each of these filters can be configured

independently into one of two filter types

or defeated completely by way of the three-

position “Filter Mode” switches:

“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 one or

more of the A6450’s channel pairs.

JL AUDIO A6450 7

INPUT SECTION

The A6450’s input section allows you to send

signal to the amplifier section through the use of

two, four or six differential-balanced inputs.

Input connections are via three pairs of

traditional RCA-type jacks.

If you wish to send six discrete channels into

the A6450, simply use all six inputs and set the

“Input Mode” switch in the “Channel 5 & 6

Controls” section to “Discrete”.

If you wish to feed all six channels by using

only four channels of full-range input, set the

“Input Mode” switch in the “Channel 5 & 6

Controls” section to “Sum” and use only the

inputs to channels 1, 2, 3 & 4.

If you wish to feed all six channels by using

two channels of full-range input and two

channels of low-frequency input (subwoofer

output from the source unit), set the “Input

Mode” switch in the “Channel 5 & 6 Controls”

section to “Discrete”. It will be necessary to split

the full-range signals with y-adaptors and feed

these signals into the inputs to channels 1, 2, 3 &

4. The dedicated subwoofer signal should be sent

to channels 5 & 6.

If you wish to use only two channels of input

to deliver signal to all six amplifier channels,

it will be necessary to split the two signals with

y-adaptors and feed these signals into the inputs

to channels 1, 2, 3 & 4. Set the “Input Mode”

switch in the “Channel 5 & 6 Controls”

section to “Sum” and use only the inputs

to channels 1, 2, 3 & 4.

Input Voltage Range:

A wide range of signal input voltages can

be accommodated by theA6450’s CH 1&2 and

CH 3&4 input sections (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 for each input pair.

No line output converter is needed in most cases.

The CH 5&6 input section is designed to

accept only line-level signals and may clip

(distort) if high-level signals are applied to it.

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.

6 JL AUDIO A6450

JL Audio A6450 Seite 4

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