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jessie.dazzle wrote:

Romy, I'm trying to understand your logic in choosing a multi-cell design (instead of a single-cell oval or rectangular 180Hz exponential horn of the same vertical height)... Was this in the interest of achieving a more diffused radiation pattern (less beaming) or possibly a desire to keep horn length short?

Oh, well. When I begin this think about the larger Fundamental Channel I was thinking about the rectangular 180Hz exponential horn. They I found a site that give me an idea that other options are possible. Ironically the site that gave me the idea was my own. If you look at home page, at the site center image then you might see a cartoonish of multi-cell horn. The fun part that I very much like the sharp curve of this horn and I thought that I will be able to do the same. I was talking with a few horn makers asking them for 21-23 cell horn that will have 160 degree opening. You the problem is that math to circulate the Multi-cell try assure the right curve of the side cell and as I understand it presume HF radiation. To make the long story short - I made 18 cell as I was not able to find anybody who do semi-omni 23-cell. That would be the lower MF only but people apparently do not get the DSET concept applied to horns.

Yes. The logic with multi-cell was coming from the fact that they would be shorter as I do not want the Fundamental Channel to be excurted too much further. And yes, wider radiation pattern also was my intention in the new room. The new multi-cell made to have 2” less height then my 250 Tractrix as in the spherical horn there are those chords from top and bottom. My initial idea was to have less cell in center – only one row and 2 extra vertical cells from sides – 22-24 cells, or to have sort of narrow middle with two multi-cell budges on the side. I would not able to find anybody who would go for the implementation such an ambition thing. It would be virtually a combination of 2 18-cell and one vertical rectangular combined together per channel. It is possible to build it but it is VERY difficult (if possible) to curves averting into the same 2” throat. It however might be possible if the condition will care only lower MF.

Here I am with my conformist multi-cell, it is not what I would like to but it is what I have. The idea was that if it does not work for Macondo then I will add it to my Altec 19 project. As I said I am not too pleased with visual aspect of the multi-cell. The whole beauty of the spherical shape is that it natural and it does not look like hardware makes efforts to produce sound.  The multi-cell makes hardware too much trying – I do not like it.  Might be I need to see how it works in black or might be I need to mount the multi-cell in place the  Fundamental Channel after I paint them and to see if the multi-cell will feel right. As now, the multi-cell feels like “it is not from there”….

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