I have the same question. It is not the volume from the audio OUT but how well the Microphone records.
I have used the 2 mic board and the 6-mic board, and I seem to be getting better audio recordings with the 2 mic board.
What is the differences in the microphone devices themselves between the 2 mic and 6 mic PI hats?
I have also ordered the 4 mic board as well, and will be testing that one.
Thanks