Solid State Logic X-EQ - Manual (Page 21)

Constant Q New
Defined Q is always perfectly maintained independent of bell gain
(also below 6dB). In terms of P – 3dB definition of this equaliser
can be classified as proportional.
P/2
Parallel
Recreates the passive LC parallel equaliser with all its advantages
(sound) and disadvantages (band interaction, asymmetry). As found
in graphic equalisers.
3dB boost, 0 – 3dB (x2) cut
6.2 Shelving Filters
Low and High shelves
Q value is used to control overshoot characteristic. On the left is the
Low shelf filter with a low Q value, on the right the High shelf filter
exhibits overshoot with a large Q value.
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