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Dominik wrote:

You probably decline this option, because this horn is from plasctic ( You can take carbon horn also). Polish autotech make Iwata 300 for me. You Can order from them what You want.

Yes, the Iwata horns are good as they have right horizontal vs. vertical proportion for my case but the Iwata profile optimized for HF, something that I do not need. Still I am looking into some kind of derivation of Iwata profile – I need to look into this further. My leading idea is 18-cell horn by in my custom shape…

el`Ol wrote:

Probably too "budget", but they have almost everyting. http://stores.ebay.de/Stereo-Lab

Thanks, el`Ol, the Stereo-Lab do juts fast opening horns – I do not need then for Fundamentals Channel. Also they do spherical horns and I very much would like to stay away from spherical for this given lower MF Channel.  Might be I will consider an oval shape - it is hard to do it in mass, however….

jessie.dazzle wrote:

When you get those cat paws on a 170-180Hz horn, you'll likely try listening to it while letting it cover more than just 600Hz of bandwidth (letting it run up higher than 1000Hz)... There is a possibility that one day you'll decide this is in fact the way you want to use it, in which case you might wish you had gone with a round horn.

I do not think I will. I will most certainly do not need it to go over 1000Hz, why would I? It is very much not my objective. All the I would like to do it to give to Fundamentals Channel some room from the bottom to breathe as I fill it is a bit too contortionistic now.

jessie.dazzle wrote:

You do have the space for it, but it would require that you move the Injection Channel up; since it is running at -12dB, this should not upset the perceived height of the image.

This is not my objective as well. If anything I would love to find a way to move the Injection Channel down, closer to MF and HF channels. I do not how to do it, though…

jessie.dazzle wrote:

The new, larger round horn could be mounted not under, but on top of the arm currently supporting the 250Hz horn. Running a physically high-mounted 170-180Hz channel up into lower mid-range, one would logically be concerned about upsetting the perceived height of the image; In my experience (I use this configuration), the image does not so much move up, but rather increases in scale and opens up. This, to me is more like what I hear in a concert hall or theater; such a configuration does require a minimum 12-foot listening distance, which appears possible in your case. You could get some idea of the effect by running your high-mounted Injection Channel at -0dB.

Possible, but this would require moving my Injection Channel up – a big “no-no” in my book. You report that “image does not so much move up”  - it is not what I experienced in my old room. What crossover point and type of filter you use for Fundamentals Channel LOW pass filter?

jessie.dazzle wrote:

To avoid vignetting caused by the new 170-180Hz horn, the Injection Channel enclosure could be inverted so that the driver is at the top.

I am planning to avoid vignetteing by using non-spherical horns. No matter what it will be the horn high won’t be higher than 17-18”, in fact I would like to keep it 15”-16” at best if possible. If you calculate the surface that is needed to write 170-180Hz horn with 15” then you will have a good near 160 degree horn. For very much LOWER MF…. I see no problem with that. I did not those horns designed but I do not see what it shall not be made. If I knew what driver to use then I would do it. I would love S2/S3 to be able to handle the job as I love their lower knee but they are not good for pushing them too much lower.

jessie.dazzle wrote:

You'd likely also have to increase the footprint of the chassis to insure stability (extend the base plates by bolting on square section metal tubes).

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