A possible cause of non uniform frequency response of linoleum triagular pyramid speaker

A reason could be the relatively large front area compared to drive unit area.
This could cause substantial diffraction effects [Olson].


The Auratone 5C type speaker front area is almost just as small as the 5in drive unit.


Would a square base pyramid solve the problem? Speaker mounted on the square side. Then a long pyramid created?


Wilson designing the Auratine 5C must have known very well the throry of loudspeakers.


Such closed small dimension loudspeakers are called 0th order gradient loudspeakers and have flat frequency response as well as a good polar response approaching somewhat an omni ideal
[Olson].


Reference:


Gradient Loudspeakers - Harry F. Olson - JAES 1972