I am trying to dial down K67. I am thinking about gold plating myself for the diaphragm in the future, but I am not ready for the expense. It is the hardest part of the project because the sound quality mostly depends on the diaphragm quality, and the rest of the capsule is literally a container.

I started the hobby a while back when I tried to create an ESP32 field recorder, but the sound quality was terrible with the MEMS style micropones. I ordered the Japanese Primo mics (14db for 10mm is crazy), and said if Japanese dudes can do it, I can do it too.

I was trying to create a visualizer tool for my steps in the backyard with ESP32 microphones, which sync perfectly and analyze the sound locations with Time Difference of Arrival (TDOA) methods. I got close, but mic sensitivity, even at 14db is not 100% unless I place the mics 30-40 inches apart. I am still working on that project, but that also got expensive because $28 for ESP32-S3 POE and $25 primo mic per node got very expensive quickly as I wanted to cover more areas. I hope to share it soon with HN.