Article: Acoustic Radiation of a Horn Loudspeaker etc.

[WMcD]

Submitted for your consideration:

Attached is an article which uses FEA to analyze a horn tweeter. It is interesting to me because it shows that the wavefront moves perpendicular to the wall of the horn (at least of the mostpart) and is curved. It is also interesting to see the bullet type phase plug. (Little edit here.)

Gil

Acoustic_Radiation_of_a_Horn_Speaker[1].pdf

[Daddy Dee]

Thanks Gil.

[Groomlakearea51]

Ditto, Thanks; Interesting (added to the "library")

[pauln]

I've always assumed that the waves maintained perpendicular to the walls to the degree that the frequency of the sound (the relative size of the initial emmission, really) and the curvature of the horn were fairly matched, so that the wave front is curved (these two things go together geometrically) based on the radial spherical expansion of waves in free space. Otherwise, one would have to come up with an explanation for why the center axis of the wave would be going more slowly than the off axis parts at the horn walls. That is, if the wave front was a flat plane, the distance from the plug to the front center is shorter than the curved distances of the wall edges.

Would the "ideal" horn's wall curvature match the natural curvature of a radiating free space wave (same geometric perpendicularity match)?

Does the non-ideal horn's deviant curvature force the wave to be perpendicular in a way that an ideally matched one does not?

If so, wouldn't this forcing be a loss or load? Acoustic impedence?