Bedienungsanleitung JL Audio M700 (Seite 7 von 20) (Englisch)

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Input Voltage Range:

The M700/5’s input sections are designed to

accept signal voltages from 100mV – 4V. This

will accommodate all preamp level signals and

many speaker level signals.

To use speaker-level sources, simply splice the

speaker output wires of the source unit onto a

pair of RCA plugs for each input pair. (or use

JL Audio part XD-CLRAIC2-SW) No “line

output converter” is needed in most cases.

If you find that the output cannot be reduced

sufficiently with a direct speaker level signal

applied to the amplifier, you may use a “line

output converter” to reduce the signal level.

INPUT SENSITIVITY CONTROLS

The controls labeled “Input Sens.” located in

each channel 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 M700/5 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” Controls: The M700/5 employs

12dB per octave filters for each pair of main

channels (one high-pass filter for channels

1&2 and another high-pass / bandpass filter

for channels 3&4. The Subwoofer Channel

provides a low-pass filter with the option of

12dB or 24dB / octave slopes. Each of these

filters can be controlled or defeated completely

by way of the three-position “Filter Mode”

switches in each Channel Section:

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