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© 2004 Directed Electronics, Inc
SUBSONIC FILTER ADJUSTMENT
Sealed Enclosure: Set to Fs of the woofer or higher.
Ported Enclosure: Set to tuning frequency of enclosure or higher.
Sealed Bandpass: Set to Fs of enclosure.
Ported Bandpass: Set to low tuning frequency of enclosure.
Infinite Baffle: Set to Fs of the woofer or higher.
Aperiodic: Set to Fs of the woofer or higher.
This amplifier incorporates a subsonic filter
to maximize the performance of a
subwoofer. The subsonic filter is a high pass
filter that removes unwanted bass output
at very low frequencies from the woofer.
This increases the output of a subwoofer by
as much as 3 dB by increasing the mechan-
ical power handling of the subwoofer.
Depending on the type of enclosure the
subsonic filter can increase the useable low
frequency output by an additional 10 dB!
Acceptable boost levels are determined by
the type of enclosure used, wattage of the
amplifier, and the woofer’s excursion capa-
bility.
To adjust this filter, place the Subsonic Filter
switch to the IN position and turn the
Subsonic Frequency adjustment to the
desired frequency (15–50 Hz).
The following guidelines should be used
for proper set-up of the subsonic filter to
provide optimum performance and relia-
bility from your system.