JL Audio JX400/4D Manuel D'utilisation page 8

INPUT SENSITIVITY CONTROLS
The controls labeled "Input Sens." located in
each channel pair's control 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
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.
!
I M P O R TA N T !
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.
8
FILTER CONTROLS
The active filter built into each channel
section of the JX400/4D 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 JX400/4D
employs a 12dB per octave filter for each pair
of channels (one filter for channels 1&2 and
another filter for channels 3&4). 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:
"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 one or both of the JX400/4D's channel pairs
in a bi-amplified system.
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
both of the JX400/4D's channel pairs.
JL Audio