Did you take some inspiration from Mike's works
Not really, I've read that when I was almost finished
This is just a mobile box chamber…
What's the measurement outside of the chamber?
Slightly over 39. The room is absolutelly silent, as long as I an not deaf. I even took it to countryside to a house with thick walls, another nearest house is at least 30 m, during winter night at about 01:00 in another silent room again 38.8 dBA. I think the chinese toy I got (GM1358) just has very shifted lower treshold. It is very sensitive, but should measure from 30 dBA. I think it is not linearly sensitive, that's the problem. As normal speech should be about 60 dBA and that's where I am. Anyway, as I said, I do not aspire on providing valid absolute value of noise, more like comparing for the time being.