Look for the DIY versions to save a couple hundred $$. https://shop.raspberryshake.org/ I'll eventually go for the Shake&Boom to maybe find out more about the hum I sometimes perceive (Post from months ago). Though it seems to have mostly subsided, this sounds like a worthwhile endeavor that expands your perception. Featured in this video: Infrasound: What You Can't Hear CAN Hurt You https://youtu.be/UTvr8L5v8u8 He brings a lot of audio knowledge to the table and shows what microphones to avoid because of sensitivity roll-off below 20Hz.