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Multi-Way Conventional loudspeakers with crossovers

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Old Today, 08:35 AM   #2721
mabat is offline mabat  Czech Republic
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Sorry, Kees, I don't buy it. This is even what Mr. Panzer recommends and also there's an example horn project utilizing this very method. And I really can't see how it could be wrong - technically. It's just a shape of the outer shell that is different.
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Old Today, 09:03 AM   #2722
mabat is offline mabat  Czech Republic
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The outer cylinder extended 5 mm past the throat, so the whole interior is now enclosed in the outer shell (however irrelevant that is) -

-105mm-polars-png
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File Type: png 105mm-mesh.PNG (239.8 KB, 106 views)
File Type: png 105mm-polars.png (23.7 KB, 194 views)
File Type: png 105mm-field-6661.png (197.3 KB, 96 views)
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Old Today, 09:16 AM   #2723
mabat is offline mabat  Czech Republic
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The raw mesh file -
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File Type: png mesh-file.PNG (104.6 KB, 99 views)
File Type: png mesh-file-f.PNG (110.6 KB, 26 views)
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Old Today, 09:53 AM   #2724
mabat is offline mabat  Czech Republic
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My attempt to explain the worse behaviour for the longer tube is that due to the presence of the tube the SPL falls slower to the sides and as such there's a higher chance for the diffracted waves to noticeably interfere back.
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Old Today, 10:01 AM   #2725
kessito is offline kessito  Netherlands
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Thank you for trying!
I have to be honest; you have me in doubt now, I will do some of my own experiments once back home.

Another thing why I often try to not use subdomains in tjese cases; you will see that if you change the thickness of the domain coupler ( so not 5mm but ie 50mm in front of the mouth) the results change. I have never gotten a satisfactory answer from mr .Pfanzer about the optimum, I usually use 50mm if I have to because of many more subdomains.
You could als try not using subdomains at all, this gives the best matching results with reality in my experience.
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Old Today, 10:03 AM   #2726
kessito is offline kessito  Netherlands
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One other obvious observation; of course this is , diffraction wise, the worst possible shape since all diffraction pathlengths are equal.
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Old Today, 10:06 AM   #2727
mabat is offline mabat  Czech Republic
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Well, I have found the subdomains to be pretty useful, they definitely work well fo me. Also notice that in this case the interface is just flat. The 5 mm is the depth of the physical body, not the interface.
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Old Today, 10:08 AM   #2728
mabat is offline mabat  Czech Republic
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Quote:
Originally Posted by kessito View Post
One other obvious observation; of course this is , diffraction wise, the worst possible shape since all diffraction pathlengths are equal.
Yeah, but if I make the tube very short (5 mm), i.e. the edge very "sharp", these problems just go away to a great extent (#2713) - that's what is interesting. I would expect it to be the other way around.
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Old Today, 10:25 AM   #2729
wesayso is online now wesayso  Netherlands
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Can you make it flat for 5mm and follow up conical back to the throat? Sort of a horn shape without going all out to follow the inner horn shape. If that works, following the true horn shape would also work out (or perform even better).
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Old Today, 10:33 AM   #2730
mabat is offline mabat  Czech Republic
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I will certainly implement several options for this shape, including the "real" one, as this is quite interesting.
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