the paranormal and frequency

Just found this http://www.bayareaparanormal.com/articles/article_soundpt2.html

Its an interesting read, sort of got me thinking on other methods of investigation, working with sound other than EVP/VSP's etc

what about trying to adapt some sort of sonar device

http://www.force4outdoor.co.uk/228/Plastimo-Portable-Sonar-Fish-Finder.html?referrer=froogle&utm_source=google&utm_medium=froogle&utm_campaign=pid228

we could use it to scan a room or area to see what it picks up

http://www.theregister.co.uk/2009/07/01/spanish_sonar_superpowers/