Canon EOS-1D C - Manual (Page 41)

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3 Setting the Sound Recording
Using headphones
By connecting stereo headphones (commercially available)
equipped with a 3.5 mm mini plug to the camera’s headphone
terminal (p.13), you can listen to the sound during movie shooting. If
you are using an external stereo microphone, you can listen to the
sound in stereo.
To adjust the headphone’s sound volume, press the button,
then hold down the button and tilt the <9> up or down. The
sound volume level is not displayed on the screen. Adjust while
listening to the headphones.
You can also use headphones during movie playback.
The audio output to the headphones will not have noise reduction applied. It
will therefore be different from the sound recorded with the movie.