MOTU UltraLite-mk3 Hybrid User Manual page 84

Type IV
Figure 11-21: Type IV EQ filter style.
The Type IV EQ filter is a more extreme form of the
Type III filter. It exhibits a high degree of
interaction between Q and gain in order to
maintain as closely as possible an equal amount of
area under the response curve as gain is adjusted.
Type IV is the most gentle of the four EQ styles and
is ideal for large scale EQ adjustments, especially
on sub-mixes and complete mixes. This EQ style is
also ideal for any applications where subtle changes
in the overall character of the sound are desired.
For example, it can be used for mastering
applications, such as the overall adjustments that
must often be applied to entire tracks to match
other tracks on the album.
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Shelf filters
Figure 11-22: Shelf filter Q parameter overshoot.
When two top-most bands in the EQ tab are set to
their shelf filter setting (Figure 11-10), the Q
parameter controls the amount of overshoot
applied to the response curve, as illustrated in
Figure 11-22. When Q = 0.01 (the lowest setting),
normal shelving is applied with no overshoot. This
produces the response provided by a first order
shelf. When Q = 1.0 (the default setting), the
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