UAD Powered Plug-Ins Manual v5.2 - Just Music

Gain Knob
Q (Bandwidth)
Knob
This parameter determines the amount by which the frequency setting for the
band is boosted or attenuated. The available range is ±20 dB.
The behavior of the Q parameter varies depending on the band mode and
the gain. For this reason Q is detailed separately in the parametric and shelf
mode sections (see “Parametric Q” on page 207 and “Shelf Q” on
page 210).
Parametric EQ
A band is in parametric mode when shelf mode is disabled (see “Shelf Enable
Button” on page 210). Three types of parametric EQ are available, as determined
by the Parametric Type selector.
Parametric Type
Selector
The Parametric Type selector changes the response of the band
controls to reflect the behavior of various analog equalizers. It is
a global control for all 5 bands, and has no effect on the low
and high cut filters. Click the Parametric Type display to rotate between Types
I, II, and III.
The filter algorithm is the same in all three parametric types. The difference is
in the dependency between the gain and Q parameters. Each parametric
type has its own response characteristics.
In Type I mode, the Q remains constant regardless of the gain setting. In Type
II mode, the Q increases as gain is boosted, but remains constant as gain is
attenuated. In Type III mode, the Q increases as gain is boosted and attenuated.
See Figure 62, Figure 63, and Figure 64.
Parametric Q
The Q (bandwidth) knob sets the proportion of frequencies surrounding the
center frequency to be affected by the gain control. The Q range is 0.25–16;
higher values yield sharper slopes.
Note that the Q numeric value in relation to its knob position is warped (i.e.
not linear) and varies according to the parametric type.
UAD Powered Plug-Ins Manual - 207 - Chapter 22: Cambridge EQ