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JL Audio xd700 Manual

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8 | JL Audio - XD700/5v2 Owner’s Manual
To properly set the amplifier for maximum
clean output, please refer to Appendix A (page
16) 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
16). 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 XD700/5v2 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 XD700/5v2
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:
Channel 1 & 2 Filter: 12dB/octave High-Pass
only, with x10 multiplier switch
“Off”: Defeats the filter completely, allowing
the full range of frequencies present at the inputs
to feed these channels. This is useful for systems
utilizing outboard active crossovers or requiring
full-range reproduction from this channel pair.
“x1” (High-Pass): Configures the filter
to attenuate frequencies below the indicated
filter frequency at a rate of 12dB per octave.
This is useful for connection of component
speakers or coaxials to this channel pair in a
bi-amplified system.
… 8 …


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