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Rounding internal angles
Rounding internal angles
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Old 21st March 2011, 09:25 PM   #1
ziocalepino is offline ziocalepino  Italy
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Default Rounding internal angles

Hi, a friend of mine told me that internal angles of the labyrinth of a BLH encoluse must be rounded.

I''m building Bicor 200 enclosures that have many acute angles between their inner sectors. I presume that who designed this plan wanted the angles be sharp. I'm I wrong? I think that to vary too much relative dimensions of pieces can affect the sound. This friend suggested me to pass with sand paper very lightly, using hands and not a mechanical sander.

What do you think about this argument? Reading some other posts it seems to be a good idea but I don't know how much to round!

Many thanks

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Old 22nd March 2011, 12:27 AM   #2
steviedon is offline steviedon  United States
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Any sharp angles and/or roundovers/countouring , are inherent to the design as you suspect. I suspect that rounding/countouring in a design that has sharp angles, may yield undesirable midrange energy emanating from the mouth......to what degree, who knows. Keep the design as it's drawn. Happy building
It is only rarely that one can see in a little boy the promise of a man, but one can almost always see in a little girl the threat of a woman. ~Alexandre Dumas

Last edited by steviedon; 22nd March 2011 at 12:30 AM.
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Old 22nd March 2011, 05:05 AM   #3
planet10 is offline planet10  Canada
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Rounding internal angles
There is another thread on this subject with posts as recent as yesterday.

Folded Horns: Smooth curves vs angled corners

community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
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Old 25th March 2011, 11:51 AM   #4
ziocalepino is offline ziocalepino  Italy
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Thanks for helping. Does anybody have pictures to understand how much it is necessary to sand? I've no idea about this.

Thks again

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Old 25th March 2011, 12:15 PM   #5
Saturnus is offline Saturnus  Denmark
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I thought it was just pointed out that the sharp corners are part of the design. Rounding any of the corners will mean you increase the bandwidth of the horn, ie. it produces more midrange, and that is generally undesirable in a BLH.
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Old 25th March 2011, 03:13 PM   #6
ziocalepino is offline ziocalepino  Italy
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I think I'll do a compromize. Only smoothing sharp corners without create a proper "curve" instead of angle. This to minimize turbulence and to reduce middle tones enhancement. Soon few pictures of my work.
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