In the 16 kHz and 27 kHz high-shelf filters, the inverse bell filter added by the Bandwidth control
has a higher gain than in normal modes and is located for both around 8 kHz. This enables you
to obtain optimal control between the very high end of the spectrum and the high-medium
frequencies where you might experience sibilance.
Special 16 kHz and 27 kHz high-shelf filter modes with Bandwidth set to minimum
Pulsar Massive - User Manual - page 12 / 35