Spherical Horn / Kugelwellen - Trichter

[Hoerninger]

Angelo,

I have to disagree, go through the mathematics and you will see the difference. The tractrix contour will merge into a baffle by definition, the Kugelwellentrichter will form a shape that is closed at the back, if you go on calculating.

I know the Klang&Ton pretty well. Nice paper but I would not call it a reference. Concerning horns they are writing what others have done before. And the Kugelwellentrichter is mostly unknown in Germany - and elsewhere.

In your site you will find some links to original Kugelwellentrichter literature. (I have used your site to depose there a lot of links relating scientific reserches and implementations mainly connected with JBL - and KLANGFILM.)
__________
Peter

hello Peter

according to Klang & Ton 4/91 the Kugelwellenhorn , and Tractrix horn , are identical :

http://www.audiovoice-acoustics.com/...sted=1#post746

see Part 2 of the article series.

Angelo

[Hoerninger]

An explanation in English for the spherical wave horn (Kugelwellentrichter) you find in

audioXpress
Horn Theorie:
An introduction, part 2, page 1
by Bjorn Kolbrek, 2008

Links for part 1 and 2:
http://www.audioxpress.com/magsdirx/...olbrek2884.pdf
http://www.audioxpress.com/magsdirx/...olbrek2885.pdf
___________
Peter

[JBL 4645]

No need to play that loud in the home the warmth of the sound will be nice around 75db. That look’s smashing in the rosewood or what ever very stylish and elegant looking.

[Hoerninger]

Recently I found the Siemens/ Klangfilm patent to this topic:
http://worldwide.espacenet.com/publi...R=952179C&KC=C

The patent started January 12, 1940, shortly after the beginning of war. The patent came to public 1956.
In the early 50s Siemens/ Klangfilm built the huge "EURONOR II" based on spherical wave horns, which had short distances to the screen. There had been a predecessor "EURONOR" with 2 meter long HF horns. It had great success with its introduction in 1938. Production stopped with the beginning of war.
http://www.filmsoundsweden.se/backspegel/euronor.html

This Klangfilm document shows that they used the expression Sperical Wave horn:
http://www.klangfilm.org/data/docume...3-a6-a1/01.jpg

An English description of Spherical Wave Horn you find on Kolbreks home page:
http://kolbrek.hoyttalerdesign.no/images/misc/horntheoryintroarticle.pdf

The copied artikel of post #1 is taken from
Prof.Dr.-Ing. W.Reichardt „Grundlagen der Elektroakustik“(S.359 – S.362) , Akademische Verlagsgesellschaft Geest & Portig K.-G., Leipzig, 3. Auflage 1960

Benutzer der deutschen Sprache lesen besser hier:
VISATON Diskussionsforum, Anleitungen (Tutorials), Bücher- und Linklisten:
http://www.visaton.de/vb/showthread.php?t=27995
____________
Peter

[gibber]

Thanks for this wrap-up, Peter

It is indeed a different expansion. Also wasn't aware it requires a dome to begin with. Was that the reason some of the German monster horns of the 80's used Dynaudio D54 as a driver? I would have thought like Bruce Edgar and others had it, i.e. same as tractrix, until reading this and your visaton.de thread.

Highly appreciated. Sad we have 700 miles or so between us, but let me know if you plan to be in Munich sometime this year !

Ralph