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8 JL Audio
INPUT SENSITIVITY CONTROLS
The “Input Sens.” control is 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). The “Input Sens.” control
is equipped with a LED “Clipping” trim ring to
simplify the input sensitivity setting process.
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 the “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.
LOWPASS FILTER CONTROL
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.
JD monoblock amplifiers are equipped with
an active low-pass filter designed to attenuate
frequencies above its filter frequency, so that the
system’s subwoofers do not reproduce any audible
midrange content.
This serves to improve tonal balance and
to avoid distortion. Correct use of the filter
can substantially improve the fidelity of your
audio system.
LP Filter Operation:
JD monoblock amplifiers employ a 12 dB per
octave low-pass active filter with fully variable
frequency selection between 50 Hz and 500 Hz
via the “LP Filter Freq. (Hz)” control knob
(80 Hz is a good starting point for tuning
most systems).
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