Hi all! Can anyone explain me why the directivity of a loudspeaker varies with frequencies? It is observed that the speaker is omni-directional at low frequencies and becomes increasingly forward-directional towards higher frequencies. This is to due with the wavelength, but I have no clue on why it is so. http://www.linkwitzlab.com/rooms.htm This website mention some more observations but it doesn't provide explanaton. Can anyone help explain me?