Horn Design Experiment - Does Shape Really Matter?

How much does the shape affect the performance of a horn or waveguide? This video is made to answer that.
Each of the four are exactly the same size and thickness, making all the horns the same depth. Changes in shape are to the flare from completely flat to fully rounded.
As noted in the video, the flat one has a significantly larger hole at the throat, and that's the biggest difference between the samples.
Best overall is the fully rounded, with the smoothest response and the most horn loading gain centered at around 2800Hz. BUT, and this is important, "best" in this instance probably won't translate to audibly better for most serious listeners. Younger people who still have the capability to hear those high frequencies may hear a difference, but preference for sound quality is subjective, even though one measures objectively better.
The response is virtually identical below 8KHz and there's not a lot of musical content above that in most songs. As the horn gets deeper the shape may have a more pronounced effect on the response, but the changes would have to be large to result in an easy to hear difference.
One finding is that it seems a more important factor to avoid cancellations in the higher frequency (like that 13KHz null in the flat horn) is to make the throat as close to the tweeter dome as possible. This requires more tests, and I'll do that the next time I design a horn.
Watch the video showing the horn I made for my speakers here:    • What Does a Tweeter Horn Do? And Diff...  

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