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OS-SE WaveguideAs a result of extensive experimentation and BEM analysis a new formula for a smoothly terminated waveguide profile was developed, which is now implemented in Ath.
Ath allows for variation of the formula parameters arbitrarily and independently in every radial direction, offering virtually unlimited possibilities of the overall horn shapes. The formula also sets an opening angle at the throat, matching a compression driver exit if needed. In addition to that a secondary flare roll-back algorithm was developed to terminate the profile into free air seamlessly, making free standing waveguides a viable option. The algorithm itself is proprietary but can be utilized in the Ath tool.
Further reading: OS-SE Waveguide.pdf
Example: OS-SE formula in Desmos calculator
(For more details about the formula please see the User Guide)