Canon 814XL-S - Manual (Page 130)

NORMAL
Usually the switch should be set to this posi­
tion. At this position, the camera will record sur­
rounding sounds of your interest as they are,
making use of the camera's entire recording
frequency range. It is also suitable for recording
bass sounds such as those from music, drums,
bells, etc. Since it limits echo, all sorts of sounds
will be recorded providing there is no back­
ground noise, such as wind.
BASS CUT
At this setting, the low range of the recording
frequency is eliminated to record sounds clearly
when the sound source is close to the micro­
phone, when filming inside an echoing room or
in windy, noisy places, or during street inter­
views.