Rounding internal angles

[ziocalepino]

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

Ziocalepino

[steviedon]

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

[planet10]

There is another thread on this subject with posts as recent as yesterday.

Folded Horns: Smooth curves vs angled corners

dave

[ziocalepino]

Thanks for helping. Does anybody have pictures to understand how much it is necessary to sand? I've no idea about this.

Thks again

Ziocalepino

[Saturnus]

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.

[ziocalepino]

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.