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Dominik wrote:

I print almost all posts from this site. For last months I study them a lot. I completly suck in by Romy vision of sound reproduction. First I decied to build melquiades amplifier and give it a try with my ob setup. Next step is "horns" I found on ebay german plastic horns, but anywhere I cant get not plastic but massive 115hz horn for a fair price. I spoke with german company but they want 12 000 euro for two 115hz horns!!!! I want to hear sound of this horns, I never heard it before. Yestarday I met my friend who run big company - they building agricultural units and have lot of cnc machines.He told me: "give me auto cad 2d project and then I can tell You if I can do it for You" I dont know how to use autocad. I tried but its to complicated. So gentelmans, Do You have  auto cad 2d drawings of 115hz horns with 4" throat?

Dominik, I ma not pleased with your “suck in by Romy vision of sound reproduction” but this is another subject.

Regarding your autocad and the horn things….

I would not advise to build anything as you have an idea what it might be. Find somebody and listen horns, get a grip what it is all about – horn are tricky, most of them are very bad an you might not like them.

Anyhow, there are many free circulation tools that would allow to get horn prose and dump it into autocad. I have at my site a tool for Tractrix profile, with which you calculate whatever you wish:

http://www.romythecat.com/Docs/TractrixCal.xls

Some might feel that 115hz horn might not be Tractrix but to have slower opening. There are some cone and pros for this view. I do not have exponential of another calculator handy but you might find them online. Still, I would strongly discourage you to make actions juts because any Moron on line, would it be me or anybody else, juts has a “vision of sound reproduction”. Get the reference points, correlate them with own objectives and then make a decision if it might benefit you.

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