Filter
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11
© 2002 Directed Electronics, Inc
The crossover and filter gain adjust-
ments can be performed two different
ways, by using a piece of audio test
equipment called an RTA (Real Time
Analyzer) or by listening to a familiar
piece of music. The RTA is most
commonly used to achieve the flattest
possible system response in preparation
for a sound-off competition. Although an
RTA may help in setting a flat system
response, it does not allow for your
personal listening preferences. When
setting the EQ filter and gain controls
using a familiar piece of music, adjust-
ments can be made according the way
you like the music to sound in relation
to the vehicles acoustics and the type of
drivers in the system.
1. Set all filter gain controls to their
flat setting by adjusting all the filter
knobs to the center or 0 setting
when they are extended and set to
their in position.
2. Set all frequency controls to their
flat setting by adjusting all the filter
knobs knobs to the flat or 0 setting
when they are extended and set to
their out position.
3. If using the dedicated subwoofer
output, set its gain and frequency
control to the center position.
NNOOTTEE::
When interfacing Directed class d amplifiers with non-
defeatable low-pass crossovers adjust the amplifiers
crossover point to its highest frequency setting.
4. Turn on the head unit and play a
familiar piece of music as reference
material.
5. If the front and rear outputs have
been set to high pass by setting the
switch on the rear panel to the high
pass setting, adjust the front
crossover to the lowest possible
setting with a minimum of distor-
tion. Repeat for the rear speakers.
6. At this time adjust the subwoofer
frequency and volume to match the
crossover settings for the satellite
speakers. When set properly the
bass should not be localized and
voices should not be heard through
the subwoofers.
7. Adjusting the frequency control
knobs out direction from center will
change the center frequency and
bandwidth parameter for that
particular filter. The higher the
frequency (clockwise) for a filter
the wider bandwidth, the lower the
frequency (counter-clockwise) the
narrower bandwidth.
8. Once the center frequencies and
bandwidth have been adjusted
controls have been set, use the
filter gains (filter knob’s in position)
to fine tune the system for differing
tastes in music or material.
CROSSOVER AND FILTER ADJUSTMENTS