8. Determine Crossover of the QSub
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In this section we will determine the low pass frequency and slope
and the phase of the subwoofer. Our approach is to use the QSub to
help smooth the overall in room bass response and extend the low
frequencies.in order to achieve this goal it is recommended to allow
overlapping. You should use the frequency, phase and slope setting
of the sub to achieve the smoothest overall bass response. This way
the mains and a single QSub load the room from three positions. In
the example in Figure 6 below, the best location for the sub (red line)
has a dip at 70 Hz. The mains (black line) don’t have the same dip so
they are allowed to run down to about 60 Hz to eliminate the dip.
With this arrangement all dips below 100 Hz are eliminated. Below
100 Hz, EQ is required only to shape the response to match the
target curve. A conventional crossover would fail to eliminate the
dips regardless of the number of subwoofers. No possible subwoofer
locations were able to remove the dip.
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