Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 323)

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3 Setting the Sound Recording
Wind filter : When [ Enable ] is set, it reduces the wind noise when
recording outdoors. This feature works only when you
use the built-in microphone for movie shooting. Note
that [
Enable ] reduces low bass sounds, so set it to
[ Disable ] when there is no wind. It will record a more
natural sound than with [ Enable ].
Attenuator : Automatically suppresses sound distortion caused by
loud noises. Even if [ Sound rec. ] is set to [ Auto ] or
[ Manual ] before shooting, sound distortion may still
result if there is a very loud sound. In such a case,
setting it to [
Enable ] is recommended.
Using the microphone
Normally, the built-in microphone for movie shooting records
monaural sound. Stereo sound recording is possible by connecting
an external stereo microphone equipped with a miniature stereo
plug (3.5 mm diameter) to the camera’s external microphone IN
terminal (p.28). Using the Directional Stereo Microphone DM-E1
(sold separately) is recommended.
Line input
Line out stereo sound from a mixer, etc., can be input directly to the
camera. By connecting a miniature stereo plug (3.5 mm diameter) to
the camera’s Line IN terminal (p.28), stereo sound will be recorded
with the movie. The standard IN level is -8 dBV. Adjust the sound
recording level to suit the Line OUT level.
Wind Filter/Attenuator