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WE11 long throat ideas

What curvature formulas does those vintage long throat horns use?
Is it just an extension of the regular tractrix?

I am thinking of making an extension of my 2" throat horns down to 1,4" reaching to the bottom of the driver-exit just to eliminate that driver exit angle error (10 degrees meeting 4 degrees). By extending the current throat curvature (approx. 4 degees) the extension would be 107 mm long. But would it be a good idea to make it longer?

The horns are 200Hz tt-horns with Radian 750Pb drivers used down to 350Hz 1st order filter.

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Topic - WE11 long throat ideas - pix 22:45:35 02/01/17 (18)


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