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Omni-directional Horn-speaker 2426H
Hello,
I need advice or (mathematical) helps.
I want to build a omni directional horn. I want to use the JBL 2426H driver in combination with JBL 2118H. Crossover frequence about 800hz
How can i calculate the horn for the 2426H and the 2118H?
Do you think its an good idea?
Kind regards Matthias
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Cross-section of the Bella Luna horn
This is a 184.54 mm long exponential horn with a 104.16 times expansion (from 506.71 mm² to 52778.76 mm²).
We need a transition from vertical to horizontal, and I decided upon a quarter ellipse (the red curve). The remainder of the horn is straight (the blue curve).
I wrote a C++ programme to bend the horn around a curve like this one (the red curve followed by the blue curve) and to generate a point cloud for conversion into a 3D drawing. The conversion of the point cloud was carried out by CATIA (https://en.wikipedia.org/wiki/CATIA).
This is how the length of the horn to a given point on the red curve is calculated:
https://en.wikipedia.org/wiki/Ellipt...he_second_kind
The bending programme also requires the normal line
https://en.wikipedia.org/wiki/Normal_(geometry)
to be calculated for any given point on the curve.
The woofer is radiating into a surface given by a quadratic function such that the slope is 1 at the centre and 0 at the outer edge.
The benefit of this design is that the loudspeaker comes close to being a point source horizontally.