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Re: when horn expansion and mouth size exceed the 1/4 lambda

"For example a conical horn with a given mouth dimension will have less low end loading than an exponential horn with the same mouth dimension and length".
Of course, because of the flare rate of the conic versus the exponential. While the exponential flare near the mouth is rapid that's not where most of the resistive characteristic of the horn is derived; that happens at the throat, where the horn cross section is the smallest. The quicker the expansion near the throat the less the resistive loading. And, more to the point of the question at hand, vis-versa.

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