Wisdom Audio DCAB-1 - Manual (Page 33)

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Choose a frequency that is centered on the peak in your system, add 5-6 dB of
amplitude to begin with, and start opening up the width of the filter by reducing
the Q. Then, as you begin to see the results, fine-tune the settings to flatten the
peak, adjusting frequency, amplitude and Q as needed.
Once again, you do not have to get this perfect just yet. You will be refining
your settings later.
Work from the Bottom Up Having corrected the two most predictable problems in the planar magnetic
section of the response (above the crossover frequency), you can now use the
remaining two boost and two notch filters to address the largest remaining aber-
rations in your room’s response. Work from the crossover frequency up, solving
one problem at a time in a methodical way
By the time you are done with the planar section of this one channel, the area
above the crossover should begin to look like the target curve described above
and shown below:
It should be relatively flat from the crossover up to about 600 Hz, and then shelf
down to another relatively flat plateau from there to about 20 kHz. If it isn’t
quite as smooth as you’d like it, don’t worry: the final adjustments are done after
the woofer section is also calibrated.
Switch to the Bass Section Once again, you are going to work from the bottom of the range up.
Rough In Bassis The first step to is make sure the Bassis section is “roughed in” (set to approxi-
mate values). The low frequency regenerator in your Adrenaline speaker is
capable of delivering far more output than its relatively small enclosure would
normally allow; this initial setting of the Bassis filter gets it close enough that you
can see what is really happening with the acoustics of your room. The factory
default settings for Bassis are as follows:
Smooth the 40-80 Hz Octave Once you have confirmed that the Bassis filter is “roughed in,” work on the
40-80 Hz range. In almost all residential spaces, there will be some significant
problems that need to be addressed in this range. (The bass problems in smaller
rooms may extend up to 120 Hz or more).
Use the boost filter to fill the most significant dip in response between 40 Hz
and the crossover frequency for your system. The Q for this boost is usually in
the 85-90 range.
Take care when boosting low frequency dips in response — if the microphone
is sitting in a null (an area of cancellation) in your room, adding more power to
the region won’t help. In this situation, there is a reflection that is cancelling out