Reply To: http://hebrewbooks.org/pdfpager.aspx?req=22679&st=&pgnum=99&hilite=

golfer:

What I understood about the walls having ears is that under the right architectural conditions, sound can travel across a diagonal from one corner to another and someone in the opposite corner will be able to hear what should be impossible for him to hear, considering that even people just a few feet away from the speaker can’t hear it.