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Scott Dorsey Scott Dorsey is offline
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Default pressure buildup rings on Sennheiser mics

Ray Thomas wrote:
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 ?


Yes.

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 ?


DPA sells ball-shaped "Acoustic Pressure Equalizers" that do similar things,
and you can make your own too. They come with frequency response plots
showing on-axis and 90' off-axis response changes. If you copy DPA's design
and make solid rubber 1" and 2" diameter balls, they should match the same
plots that DPA shows for their 1" and 2" balls. They should work with any
omni mike.
--scott



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"C'est un Nagra. C'est suisse, et tres, tres precis."