
Home  Forums  Rules  Articles  The diyAudio Store  Gallery  Blogs  Register  Donations  FAQ  Calendar  Search  Today's Posts  Mark Forums Read  Search 
MultiWay Conventional loudspeakers with crossovers 

Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving 

Thread Tools  Search this Thread 
29th May 2004, 06:34 PM  #1 
diyAudio Member
Join Date: May 2004
Location: port townsend

theoretically ideal horn design?
hi everyone
I am very new to this world and still looking for alot of answers to simple questions.so here is my question of the day. After seeing that many people are building horn speakers(i hope my wording is correct),is a horn speaker by deffinition a encolure that is tapering and spiraling?if so what are the benifits of this design? The horns that i have been looking at are very angular internally is this on pupose or to simplify the building procces?is somthing like the nautilus the ideal shape for a horn.And lastly does any one know of a source for the equations to figure the internal shape of something like a nautilus? Thank you all for looking and please respond with ANY info,i mean it when i say that i have alot of learning to do. Thanks Yosh 
29th May 2004, 07:21 PM  #2 
diyAudio Member
Join Date: Oct 2003
Location: .

My favourite is the spherical (aka tractrix) ...

29th May 2004, 07:24 PM  #3 
diyAudio Member
Join Date: Oct 2003
Location: .

Here is one...

29th May 2004, 07:27 PM  #4 
diyAudio Member
Join Date: May 2004
Location: port townsend

by spherical you mean a spherical inclosure behind the driver?

29th May 2004, 09:25 PM  #5 
diyAudio Member

Hi fellow builder, I'm biulding some horns for myself too aswell (Car subwoofer (2x8" fancy design discussion))
Horn is basically a pipe which diameter changes along the way by means of mathematical function (hyperbolic, exponential, tractrix, conical)
__________________
Profanity took a very interesting form in Russia where there exists a language of sorts, most of its words based on four basic profane roots  nouns p...is, wh.0.e, c..t and verb f..k. It is possible to sensibly communicate using just these four basic roots. 
29th May 2004, 09:35 PM  #6  
diyAudio Member
Join Date: Oct 2003
Location: .

Quote:


29th May 2004, 09:40 PM  #7 
diyAudio Member
Join Date: Oct 2003
Location: .

It is interesting to note that the most expensive horns use the spherical (tractrix) flair  claiming it provides the least colouration of sound.

29th May 2004, 09:49 PM  #8 
diyAudio Member
Join Date: Nov 2003
Location: Brighton UK

As with everything there is no such thing as ideal or perfect.
A "caternary" profile is probably the best compromise. This profile is formed by a hanging chain. But TBH a mildy truncated version is better. sreten. 
30th May 2004, 01:11 AM  #9 
diyAudio Member

Actually there is an ideal shape and that is having a straight center line which is only common with mid range and higher frequency horns like those pictured above. Straight bass horns are uncommon due to the required lengths involved. The folded horns that you've seen are for bass and maybe even midbass frequencies since the folds have less of an effect in the lower frequencies. The best expansion rate (flair rate) is a matter of preference and debate and seems to be frequency dependant.
A nautilus shell has a "golden ratio" rate of expansion. See http://www.camerahobby.com/EbookGol..._Chapter16.htm . If made large enough, it might make a great bass horn. Here's some good basics about horn theory: http://www.volvotreter.de/downloads/...le_Horns_1.pdf http://www.volvotreter.de/downloads/...le_Horns_2.pdf http://www.volvotreter.de/downloads/...le_Horns_3.pdf
__________________
Everyone has a photographic memory. It's just that most are out of film. 
31st May 2004, 03:54 AM  #10 
diyAudio Member
Join Date: Nov 2002
Location: NZ


Thread Tools  Search this Thread 


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
LM4702 reference design note 1490  ideal 1st amplifier?  Spasticteapot  Solid State  8  20th February 2013 09:47 PM 
Need help with 1st horn sub design  Marzen  Subwoofers  16  16th June 2007 01:09 PM 
PA Horn Sub Design  Mission313  MultiWay  20  19th April 2006 01:47 PM 
how to go from horn response to a folded bass horn design?  paulspencer  Subwoofers  8  4th November 2005 10:44 PM 
New To Site?  Need Help? 