> Funnily, parecord gives better output than arecord, audacity using
pulse input is unbearable, but using alsa hw0:0 seems fine again.

do you mean stereo recording using hw:0,0 is OK ?

arecord -c 2 -Dhw:0,0  stereo.wav

how about mono recording ?

arecord -c 1 -Dplughw:0,0  mono.wav

the signal will be much lower if the left and right channel of mic input
are out of phase when using software downmix with (left+right)/2

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https://bugs.launchpad.net/bugs/1259070

Title:
   N90SV, Realtek ALC663, Mic, Internal  Underruns, dropouts or
  crackling sound

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