Posted by raptor2990 on Jan 22, 2019; 2:17am
URL: https://www.es-forum.com/Trying-to-identify-a-frequency-sound-tp4033510p4033526.html

I would ask permission for a quick walkaround in order to identify the source of the new signal. If it's not originating on your floor, then you won't figure it out any other way.