DEPRECATED - 90x60 degree horn - elliptical profile with wide radius - 2 bolt 1" compression drivers
Description
Marking this DEPRECATED because it likely needs modifications to work well with any mainstream compression driver, due to the throat exit angle being 0 degrees (10 would be more typical for a real bolt on driver, I've since found). This is an elliptical horn/waveguide with 90x60 degree coverage angle, very roughly based on the Sica SSH-1 design on clearance at https://www.amplifiedparts.com/products/horn-sica-1-compression-elliptic. I chose this design both because of the elliptical profile and because Sica publishes polar plots for it (see attached PDF). It should be fairly constant directivity between about 1.2-14KHz with some pattern control outside of that range. If anything, my model may outperform Sica's due to the wide radius at the mouth where Sica shows a fairly sharp cutoff. This design also differs from Sica's in being designed for 1" bolt-on compression drivers. It's made for 3" (76.2mm) spaced bolts. A popular example of a driver my design will fit is B&C's DE250: https://www.parts-express.com/bc-de250-8-1-polyimide-horn-driver-8-ohm-2-3-bolt--294-605. Compared to the Sica and other commercially available horns, this design also has a much sturdier connection between the compression driver interface and the rest of the horn. This should make the design stable for use with heavier duty compression drivers such as Emilar vintage models, although that remains to be tested.
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