HI-PASS (Subsonic filter): Use the
HI-PASS knob of the amplifier to set the
internal high-pass crossover from 10–40Hz.
The amplifier will pass audio above the
selected frequency threshold. This is used
to protect the subwoofer driver from over-
excursion due to ultra-low frequencies.
Typically you want to set it one octave
below the enclosure's tuning frequency (eg
if the box is tuned for 40Hz, use a setting of
20Hz).
LO-PASS: Use the LO-PASS knob of
the amplifier to set the internal low-pass
crossover from 40–160Hz. The amplifer will
pass audio below the selected frequency
threshold. The subwoofer should only
play deep sub-bass notes. If you hear
vocals from the subwoofer, try lowering the
crossover point until only the sub-bass is
heard.
BASS BOOST: The variable bass boost
control on the side of the amplifier is
designed to give you increased output,
0–6dB, at 40Hz. The setting for this control
is subjective. If you turn it up, you must
readjust the input gain control to avoid
clipping the amplifier.
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