Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 284

Note Audio is also output when the camera is connected to televisions via HDMI, except when [Sound rec.] is set to [Disable]. In case of feedback from television audio output, move the camera away from the television or turn down the volume. The sound volume balance between L (left) and R (right) cannot be adjusted. Sound is recorded at a 48 kHz/16-bit sampling rate. Sound Recording/Sound-Recording Level Auto The sound-recording level is adjusted automatically. Auto level control will take effect automatically in response to the sound level. Manual You can adjust the sound-recording level as needed. Select [Rec. level] and turn the < > dial while looking at the level meter to adjust the sound-recording level. Look at the peak hold indicator, and adjust so that the level meter sometimes lights up on the right of the "12" (-12 dB) mark for the loudest sounds. If it exceeds "0", the sound will be distorted. Line input Line input can be used as the audio source. Audio supplied this way is combined with video to record movies. You can adjust the recording level to one of 64 levels. The adjustment method is the same as for [Manual]. Disable Sound will not be recorded. 284