It is geometry
It is sound path problem- her parents are directly above us. I tried once while talking myself, running a radio but she (when upstairs) could still hear everything. I only want the talking sound to be vague. I often hear neighbors and know they are talking but not understand a...
I live in Japan. My wife is Japanese. We live in her parent's house on the first floor and they live on the second floor. They can hear us perfectly with all doors shut. I'd like to have a microphone for plugging into a PC with a fitting that obscures voices. What should I search for? Google is...