respeaker 4 mic array become saturated

i’m using respeaker 4 mic array for recording audio.

i use this command to record:

arecord -Dac108 -f S32_LE -r 44100 -c 4 -d 10 audio.wav

but it become saturated

i mean when i plot the recorded audio i see that for long time it has the maximum value but the audio was sth different.

is there any way to change the gain of the recorder or other way to not getting saturated?