About this 3D model

Hyperbolic Horn defined by Salmon equation. Horn can be parametrized - you can change horn throat radius, cut-off frequency, T parameter, length, wall thickness, etc. You can find more details here: https://www.grc.com/acoustics/an-introduction-to-horn-theory.pdf OpenSCAD does not allow to create parametric curves so I have designed it using Autodesk Inventor. Inventor file is attached. A project using this horn: http://www.thingiverse.com/thing:1925707