Universal Audio Ampex ATR-102 Manual page 53

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.
When set to Type I, the bandwidth remains at a fixed Q regardless of the gain
Type I
setting for the band; there is no Q/Gain interdependency. In addition, there
is a finer resolution of the Q knob in the middle of its range. This makes it eas-
ier to achieve subtle bandwidth changes. Note that the Q value and knob po-
sitions do not change as the gain is modified. See
Figure 10. Parametric Type I response
When set to Type II, there is a Q/Gain dependency on boost. The bandwidth
Type II
increases continuously as the gain is boosted, but not when attenuated. The
Q knob position determines the maximum Q at full gain.
Filter bandwidth is broader at lower boost settings and narrower at higher
boost settings. This can produce a smoother, more natural response when
boosting filter gain.
UAD Powered Plug-Ins Manual - 53 -
Figure 10.
Chapter 3: Cambridge EQ