Huygen's Principle- relating to loudspeaker design


Google "acoustics.salford.ac.uk" for some fascinating soundwave theory presentations. I'm interested in the application to room treatment. Ideas?
ptss
Sincere apologies. CORRECT link
http://www.acoustics.salford.ac.uk/feschools/waves/diffract3.php
(Thank goodness I checked it!)
Wow i didn't know that.
EBM, I'm shocked; I thought you knew everything. It just goes to show-you know-live and learn-especially us dinosaurs.