Wisdom Audio DCAB-1 - Manual (Page 27)

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The Amplitude and Q parameters interact with each other to a significant
degree. Specifically, when the Q is at 100% (an extremely narrow spike or
notch), the effect on the frequency response is minimal. As you open up the Q,
not only does the result affect more frequencies (which you would expect), but
the absolute size of the correction increases. Thus the amplitude values are sug-
gestive rather than authoritative. Some experimentation will be necessary until
you develop a “feel” for the nature of the controls.
boost 4 The low pass portion of the crossover has a single parametric boost filter that
works in the same way as those on the high pass side. The first two columns
give you control over the center frequency (in Hz) of the filter, for the Left and
Right speakers, respectively. The next two columns give you Left/Right control
over the amplitude (or height) of the boost. The last two columns give you con-
trol over the Q (or width) of the boost. Taken together, these controls allow you
to tame the largest or most troublesome dip in the system’s bass response, as
measured in your own listening room.
The Amplitude and Q parameters interact with each other to a significant
degree. Specifically, when the Q is at 100% (an extremely narrow spike or
notch), the effect on the frequency response is minimal. As you open up the Q,
not only does the result affect more frequencies (which you would expect), but
the absolute size of the correction increases. Thus the amplitude values are sug-
gestive rather than authoritative. Some experimentation will be necessary until
you develop a “feel” for the nature of the controls.
Caution! As described earlier, trying to correct a room null (cancellation)
by adding more power to the problem will not fix anything. It will,
however, place a great deal of strain on your power amplifier, and on
the low frequency regenerators.
If the system seems not to respond to the boost control, you are
probably trying to fix a null. Back off the boost adjustment and
address the room null by other means (speaker placement, listener
placement, bass traps, etc.). Your system will sound better without
the added stress of unsuccessfully trying to solve a problem with
added power.
Boost & Bassis? Be careful using the boost control below the bassis frequency in
Hz. Bassis is capable of adding a great deal of power demand to
its operating range of frequencies, and adding even more on top of
bassis can be unwise, and potentially dangerous for your amplifier.
If there is a dip in response below the bassis frequency, limit your
boost settings to a Q above 90% to ensure they affect only a narrow
range of frequencies.