Sennheiser SKP 3000 - Manual (Page 7)

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HiDyn plus is a wideband compander system which compresses
the audio signal in the transmitter in a ratio of 2:1 (related to
dB). In the receiver the signal is expanded in an identical and
opposite way in a 1:2 ratio to restore the original signal.
HiDyn plus has been specially developed for high quality
radiomicrophone systems.
Note:
Only transmitters and receivers that are equipped with
HiDyn plus can work correctly with each other. If non
HiDyn plus equipment was mixed with HiDyn plus , the
dynamic range would be drastically reduced and the
transmission would sound blunt and flat.
HiDyn plus is
permanently active and cannot be switched off.