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Exit angle mismatch

Posted by Mr_Steady on February 2, 2017 at 16:11:54:
So you are saying you are using a 1.4" driver on a horn that has a 2" throat? Build the extension, or get a 2" driver. Honestly I would recommend the 2" driver. Lots of reasons if you have the time.
Please remember what Kloss told you about the WE snail horns. The were designed to utilize the capabilities of the 555 driver, which is a very wideband driver that goes really low, 120Hz or something. Unfortunately acoustic horns are not wide range transformers. The snail horns are beautiful, but an anachronism. Build one to look at if you want.
Your filter is -3db at 350Hz? You driver is operating a lot lower than that.
Hope this helps,
Edit: I also meant to say that all horns are a ratio of loading to distortion. Slow expansions like the long hyperbolic load the best at the bottom, but have high distortion. Fast expansions like the conical do not load well, but have low distortion. If you take what physics gives you then you might use a hyperbolic horn for bass, especially since distortion is hard to hear in bass, and you might use a conical for a tweeter, because you don't care about low end loading, but you do care about the low distortion. Which brings us to finding the right compromise with the midrange horn where you want both. The tractrix fits the category, but I prefer the Spherical (Kugelwellen) profile.

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