"Duke's speaker is not an Horn .... Waveguide !!!!!!!"
A waveguide is a type of horn, characterized by constant directivity, minimum-wavefront-disturbance curvatures, and a lack of vanes or diffractive shapes or features to modify directivity. Some of my models use what I would definitely call a "waveguide", and others use a device that has many (but not all) of the characteristics of a pure waveguide, so I call it a "waveguide-style horn". Macrojack's conical horns, designed by Bill Woods, are probably what I'd call "waveguide-style horns". Others may use different terminology and/or draw their lines of demarcation in a different place. For example, Bill Woods called my waveguide a "conical horn".
Duke
A waveguide is a type of horn, characterized by constant directivity, minimum-wavefront-disturbance curvatures, and a lack of vanes or diffractive shapes or features to modify directivity. Some of my models use what I would definitely call a "waveguide", and others use a device that has many (but not all) of the characteristics of a pure waveguide, so I call it a "waveguide-style horn". Macrojack's conical horns, designed by Bill Woods, are probably what I'd call "waveguide-style horns". Others may use different terminology and/or draw their lines of demarcation in a different place. For example, Bill Woods called my waveguide a "conical horn".
Duke