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Old 5th April 2005, 04:50 PM   #1
Tyimo is offline Tyimo  Hungary
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Default Back Loaded Horn Bending

Hi!

I saw the Carfrae Litle-big-horn laudspeaker and the design is fascinated me a lot! So, I would like to try to build a back loaded horn like this, in this style.

I read a very good articel on the Lowther Club of Norway about their's All fun horn. My plan is that I would use theirs calculated reducted size horn. (ca.40Hz)

Has somebody any idea how could I calculate the bend around a circle?

Tyimo
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Old 5th April 2005, 08:02 PM   #2
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http://www.diyaudio.com/forums/showt...933#post280933

This is a simplification of the problem, but it might help.

:)ensen.
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Old 6th April 2005, 04:59 PM   #3
Tyimo is offline Tyimo  Hungary
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Hi Purplepeople!

Thanks! I will read it.

I attached the horn what I would like to bend ca. 270 grade.
I don't kno how I could calculte the line lenght modification for the
bending?

Tyimo
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Old 7th April 2005, 01:09 AM   #4
mike.e is offline mike.e  New Zealand
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http://wiki16.parsimony.net/cgi-wiki...gi?wiki27133;1

Quote:
HornFolding - Microsoft (tm) Excel (tm) spreadsheet by W.H.Geiger
HornMath - Collection of formulas, mostly provided by W.H.Geiger
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Old 7th April 2005, 05:46 PM   #5
Tyimo is offline Tyimo  Hungary
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Hi Mike.e!

Thanks a lot! Very good site and this is what I meant.

Greets:

Tyimo
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Old 11th April 2005, 05:13 PM   #6
Tyimo is offline Tyimo  Hungary
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Hi!

I am trying to ask here also my question:

Could somebody tell me which horn folding method would give better result:

-the factory Fostex enclosure with sharp corners & steps or
-the attached (Isophon) enclosure with smooth curves?

What are the advantages or disadvantages?

Tyimo
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Old 12th April 2005, 01:51 AM   #7
GM is offline GM  United States
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Greets!
Quote:
Has somebody any idea how could I calculate the bend around a circle?
If you mean the acoustic length then it's SQRT(inside pathlength*outside pathlength).
Quote:
Could somebody tell me which horn folding method would give better result:

-the factory Fostex enclosure with sharp corners & steps or
-the attached (Isophon) enclosure with smooth curves?

What are the advantages or disadvantages?
Depends on your performance goals. If you don't want much upper harmonics coming from the mouth then you can use sharp corners to limit BW, though some argue that the reflections back to the throat can modulate the driver, but if you make smooth bends then you may have to deal with excessive comb filtering mids BW emanating from the mouth.

GM
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Old 12th April 2005, 05:07 PM   #8
Tyimo is offline Tyimo  Hungary
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Thanks GM!!


Tyimo
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Old 14th April 2005, 05:21 PM   #9
Tyimo is offline Tyimo  Hungary
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Hi!

Has somebody any information about this fascinating BLH enclosure?
I find (only) the picture on the fullrangedriver.com site.
It called Replikon.

Thanks

Tyimo
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Old 14th April 2005, 07:59 PM   #10
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There is a manufacturers site somewhere -- i even have a bookmark (which i can't find)... i'm pretty sure i got there off of the FR Forum...

dave
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