[Ray Thomas[_2_]]

I believe the 'pressure build-up' rubber rings that are supplied with the
Sennheiser MKH20 act as a sort of small-scale HF lift when the mic is used
in the diffuse field, and perhaps they also serve to increase directionality
(or modify the off axis response) slightly also ? Could the same principle
be applied usefully to any flat response omni mic used in the diffuse field,
or is it specifically applicable to the MKH RF mics....and how much lift
could one expect anyway, in real terms ?
Thanks for your advice,
Ray