Posted by Rapid [ 81.225.30.76 ] on June 02, 2005 at 18:09:42:
Hello!
I've read a few pages in Earl Geddes acoustic waveguide theory paper from 1989. It says that the oblate spheroidal waveguide requires a wavefront that is planar axisymmetric and it's found at the end of a properly designed phase plug or emitted by a vibrating circular piston.
I wonder which devices would give a planar axisymmetric wavefront except for compression drivers? Ribbons (but I guess it can't be rectangular)? Other speakers? What does a dome tweeter give?
I haven't taken any courses in acoustics (but is M.sc in EE), so I don't understand most of the things in the paper 
Anyway, it's interesting to read and try to understand.
/Mattias
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