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In the Forum: Horn-Loaded Speakers
In the Thread: Klangfilm: actual knowledge is better then fetish imagination
Post Subject: Why *** chose this approach is beyond me...Posted by Romy the Cat on: 6/9/2010
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 ayebee wrote:
If you look at the original Bionor drawings (you can find them at klangfilm.free.fr) you see that the "bass" horn is actually made out of two sections, the outer is curved, the inner is conical and expand both horizontally and laterally (more in the lateral), as opposed to the outer section. This gives the perceived "negative expansion", which is quite probably just a photographic illusion. Why Klangfilm chose this approach is beyond me...

Anders, why Klangfilm chose this approach is a wider and a bit complicated question. Let me try to expend on it.

Inspecting some interesting older, in some cases worthy performing designs, we sometimes come to the very same observation: we recognize something and we have no idea why it was done so. It might be applicable to anything: speakers, amplifiers, tubes, you name it.  Here is where we need to be very careful about what comes next. The most moronic people recognize this “other way of doing things”, crate a cult around it, place this “other way of doing things” to virtual altar and pray to this “other way of doing things”.  More intelligent people try to rational the “other way of doing things” with some auditable advantages that they might note. There is however another approach that I develop for myself and that I adherent to. My approach is that sometimes the “other way of doing things” 70 years back does have cogent base and sometimes it absolutely does not. It is just a way how it was done and there is absolutely nothing valuable behind it.

I do not really feel that in the end of the 40s when Siemens started produce Bionor they spent even a fraction of efforts to audition them and tested them at the level as we do today? It was made to power room of a few hundred men in movie theaters. The Siemens amps in time were way more restricted and limited – it was no need and no source for too high quality of reproduction. So, the profile of the Bionor throat might come from some kind of reasons or might be just because they did it so and it’s it. If any reasons even existed then I would estimate it as very negligible reason. The diameter of the throat is very large and the little negative curve that they had is absolutely negligible. This horn itself is a bit different then the horn that we are accustom – it does not work as horn but rather as open baffle with a little help in lower MF and upper bass. In the case of this guy above with his large MF horn the Bionor’s bass “horn” will not be running very high and the throat area is even less important.

So, the Klangfilm might not “chose” this approach, the might juts did it and did not care what they do.

The Cat

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