The capsule heads KK 131 to 145 und KK 183 to 185 are part of the variable digital miniature microphone system. KK 145 is a pressure gradient transducer with cardioid characteristic just like the KK 184. However, it has an acoustic bass roll-off characteristic in the free field and therefore suppresses interfering LF noise (wind, structure-borne noise). Since proximity effect is a natural feature of pressure gradient microphones, the KK 145 appears to be optimized for a flat frequency response at a recording distance of approximately 15 cm (speech cardioid).
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