Three months of uninterrupted service in a hostile environment has to be a new Annoyatron record. People have literally dismantled office equipment and even been on their knees trying to locate the source of the 12KHz sound. Successful deployment tactics seems to be associated with sound reflection and diffusion.
Anoyatrons are already difficult enough to locate if they’re installed beneath a desk or in the cushion of a chair, but if you deploy them in pairs behind perforated ceiling tiles, they seem to be almost impossible to locate – at least by middle management execs. Great fun !