Klangfilm K-L430 Eurodyn

[Tsingtao_1903]

So, a fellow Havenite generously lent me one of his K-L430 horns to do a deep dive. This horn is relatively short (about 8.8") to fit into a very tight cabinet space. The expansion is very fast. The mouth appeared to be Tractrix. But, the math did not work out. Perhaps it's dual-expansion? Started out with something else and ended up with a tractrix? Anyway, still taking measurements and making calculations.



The horn came with a custom made adapter flange for a JBL type driver. Just so happened that my Axi2050 mounted just fine.

 

[doglv]

What are your thoughts to how low they go?

Very cool looking. They look like a great match to 15" woofers and kind of remind me of the big Shindo's.

 

[MrEd]

That driver is so big it squashed Santa...
Cool stuff

 

[Tsingtao_1903]

What are your thoughts to how low they go?

Short horn length, small mouth (~14"x14"), my guess is around 450-500Hz. Still need to figure out the mystery expansion to know for sure.

 

[Tsingtao_1903]

Santa

Santa makes for a very cushy cushion.

 

[Boli46]

Santa makes for a very cushy cushion.

It’s a Kugelwellen (spherical wave) horn, not tractrix.

 

[Tsingtao_1903]

It’s a Kugelwellen (spherical wave) horn, not tractrix.

Thanks so much. I was having a hard time figuring it out from the dimensions.

 

[Boli46]

Thanks so much. I was having a hard time figuring it out from the dimensions.

For a description of the Kugelwellenhorn you might like to Google the Jean-Michel Le Cléac’h presentation Acoustical horns and waveguides from the 2010 ETF. It starts at page 78.

 

[Tsingtao_1903]

The Kugelwellen expansion got me really close to the dimensional measurements from the actual horn. Still tweaking the model. But, Kugelwellen it is! The theoretical cutoff frequency is around 380Hz.

 

[old_borg]

Can't like this enough!

 

[Tsingtao_1903]

In the presentation "Acoustical horns and waveguides" by Jean-Michel Le Cl'each, there is a slide showing the Klangfilm horn with acoustic lens at the mouth. Can't read German. But, I suspect the idea is to minimize beaming of the higher frequencies.

 

[FalseMetal666]

In the presentation "Acoustical horns and waveguides" by Jean-Michel Le Cl'each, there is a slide showing the Klangfilm horn with acoustic lens at the mouth. Can't read German. But, I suspect the idea is to minimize beaming of the higher frequencies.

View attachment 61317

Google translate will OCR images.

 

[Felice]

Beautiful Tractrix Horn. I myself listen to slightly smaller Tractrix horns.

 

[Boli46]

You haven’t read this thread from the start, have you?

 

[Felice]

Beautiful Tractrix Horn. I myself listen to slightly smaller Tractrix horns.

You haven’t read this thread from the start, have you?

But from the beginning. Why?

 

[Boli46]

If you had, you’d know that this is not a tractrix horn, it’s a Kugelwellen (spherical wave) horn. Quite different.

 

[Felice]

Dear Boly46. You bore me. And Jean-Michel Le Cléac'h's ETF 2010 page 78 doesn't make it any more correct either.
I wish you a good time.

 

[S0und Dragon]

I am going to assume good intentions and poor translation. Let’s keep this light hearted and respectful.

 

[Felice]

Everything has been said from my side. Wish a good night.

 

[Tsingtao_1903]

A couple of Klangfilm horn head-scratchers.

In the US and elsewhere, the male threads are on the driver and the female threads are on the horns. The Klangfilm took the opposite approach to mounting the driver. An M80 adapter with the male threads is mounted to the back of the horn via four tapped holes. Then, the driver screws onto the adapter.



Also, the opening in the adapter is smaller than the horn throat.


No idea why.