| http://www.w3.org/ns/prov#value | - The intermediate layer 330 a may comprise an air pocket between the outer air flow limiting layer 330 b and the microphone body 324 b and inner layers 330 c, 330 d, or may comprise a diffusing material, such as a foam material or woven or non-woven fibrous material or the like, such as described above with respect to diffusing layers 130 a, 230 a.
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