I have the exact same need.
I have a (“birdy”?) noise in my yard at night and I would to track it down.
I registered a spetrum analysis with a android app and it showed a 1160 Hz signal.
I have just got a 4-Mic array respeaker with a raspberry.
I have launched the standard doa example (vad_doa.py in mic_array github repo).
But I would like to implement a new feature to filter given a frequency window around 1160 Hz.