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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: RE: Midrange horn wings or baffle question posted by tomservo on March 9, 2023 at 09:37:44:
An old landmark paper on this topic, by the guy who figured this out first.
http://xlrtechs.com/dbkeele.com/PDF/Keele%20(1975-05%20AES%20Preprint)%20-%20Whats%20So%20Sacred%20Exp%20Horns.pdf
Note that Don describes a transition that minimizes diffraction but (if i recall he worked for EV at the time)
The way the math works, if one wants two different pattern angles in H and V, then the shape gets confusing If one wants to loose pattern control at the same F both H and V.
If one had 90 degrees horizontal and 45 degrees Vertical, the height of the mouth has to be twice the width. AND that is a horn that doesn't come to a point. This is an astigmatic point source, the optical equivalent of one focal length H and a second longer one V.
So how could one make a CD horn / make a horn that losses pattern at the same Frequency H and V
Well the JBL 2360 was an example of how and instead of a smooth transition use an abrupt transition to cause diffraction along that slot effectively producing a new source to fill out the horn horizontal.
https://www.hifisentralen.no/forumet/classifieds/jbl-2360-horn-par.231257/cover-image
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- An old landmark paper on this topic - tomservo 14:27:47 03/10/23 (0)
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