I am currently working with the Human-Wildlife Conflict Cell at the Salim Ali Centre for Ornithology and Natural History (SACON), Coimbatore, Tamil Nadu, India. As part of this work, I am interested in studying infrasonic vocalizations (rumbles) produced by elephants to monitor their movement patterns, with the goal of predicting elephant movement and helping mitigate human-elephant conflict.

I have the following questions:

1. Besides the AudioMoth, are there other devices capable of recording infrasonic sound (typically below 20 Hz) suitable for field deployment in monitoring elephant rumbles?
2. What are the individual components required to set up an AudioMoth for infrasound recording, specifically
   • The main device/circuit board
   • The plug-in low-frequency microphone
   • The low-frequency audio filtering board
   • The plug-in underground (geophone/seismic) sensor
   • The protective case
3. Is the low-frequency audio filtering board essential for capturing usable infrasonic data, or can this be bypassed/substituted?
4. Where can these components be purchased or acquired (India-accessible suppliers, if possible)?
5. What software tools are recommended for visualizing, processing, and analyzing low-frequency elephant vocalizations (e.g., spectrogram generation, filtering, and rumble detection/classification)?