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KK... capsule heads are part of the variable miniature microphone system. Together with the KM D (nx) or KM A (nx) output stages, the KK... capsule heads form a complete microphone. KK 184 (nx) + KM D (nx) = KM 184 D (nx) or KK 184 (nx) + KM A (nx) = KM 184 A (nx).
KK 133 is a diffuse-field equalized pressure transducer with a free-field treble boost (4-5 dB at 12 kHz). The detachable sound diffraction sphere provides a very smooth treble rise, associated with increasing directivity. The frequency response in the diffuse sound field is flat up to 12 kHz. The capsule is made of titanium.