Horn's directivity related to the pressure distribution at their
mouth: part I 
Today’s studies about horns are actually based almost completely upon directivity control. In
fact, while a good power response is finally recognized so important in professional loudspeaker
systems engineering, the directivity behaviour of horns represents certainly a useful tool to get it.
The directional properties of these devices are governed by the wavefront’s shape presented at
the mouth. An analisys of the sound pressure’s magnitude and phase distribution across the horn’s mouth
could certainly be helpful to understand how the wavefront is shaped there.
Moreover, this could help to understand what happen in some particular circumstances. For
example midrange beaming or high frequency mouth diffraction phenomena are two well
known obstacles to overcome designing a broad band constant directivity horn. A method
forwarded by us to perform such analisys will be shown through graphic illustrations. Presented
will be even the results obtained performing measurements upon real devices and the correlation
to the polar plots.
Horn's directivity related to the pressure distribution at their
mouth: part II 
The directional properties of horn devices are governed by the wavefront’s shape presented at the
mouth. An analisys of the sound pressure distribution across the horn’s mouth that we call Pressure
Distribution Mapping could certainly be helpful to understand how the wavefront is shaped
there.
Moreover, this could help to understand what happen in some particular circumstances.
For example midrange beaming or high frequency mouth diffraction phenomena are two well
known obstacles to overcome designing a broad band constant directivity horn. The method forwarded by us in the previous work is here extended to some different cases and
improved in the data processing. The results that come out of such analisys will be shown through graphic illustrations.
Presented will be the results obtained performing measurements upon real devices correlated to
traditional directivity plots as well.
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