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In the Forum: Horn-Loaded Speakers
In the Thread: Another time aligned 5-way horn project
Post Subject: Not more than 2m long horn neededPosted by Murataltuev on: 10/18/2015
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 Romy the Cat wrote:

The Supravox was 12” the Goto 4” how did you convert one into another? You would need a 3-4 feet adopter to do so.
I used GOTO's converter from dual 4" to aprox 200sq sm2 throat. It is still 2 times smaller than existing throat.Now I'm preparing 0.5m long part to reach 4" from existing horn throat and connect single driver.
Goto has 4” exit – it is what it is and this gives to you the throat of the horn. Then decide what lower frequency you would like to get from it. Let say it will be 40Hz. Calculate let say exponential horn for 4” and 40Hz and you will have your target length. For instance it will be 9 feet. 
I can't go longer than 2m. Any suggestions about configuration of horn with this length limit ? May be higher frequency ?
installation as example: I do have 40Hz horns working nicely with the system and they are not visible or detectable in the room. No HornResp would give you any advice – the system design is the derivative of your mind and your creation.
HornResp can help to get desirable frequency response and other parameters. But I don't know how to use it for GOTO drivers. I don't think that I can get Thiele-Small parameters for modelling. So, only experiments...I think I missed about your 40Hz horn. I don't see any information or reference at Macondo dedicated web-page (http://goodsoundclub.com/MacondoAcousticSystem.aspx).Can you suggest what thread to read about it ?
So, instead of thinking what kind horn you might need to build you need to think about completely different subject: “How will I integrate my horn into my system and my life if I did build it?” You need to have a clear and agreeable with yourself plane and only then build the horn. After a proper horn will be build you would need to spend time with the horn and driver to teach them to sound in the way you expect. It will take time to learn about loading, back chamber (in your case back exit damping), crossovering and many other things. 
 
Rgs, the Cat
Yes, all other things after I get proper sound from this driver. I'll try to get it from 2m long horn. In this case I can keep initial design of the whole system. Longer horn will need another room. For now I don't want to move from existing room. May be later I'll build dedicated single room house and think how to integrate horn in construnction of this house. But not now. Now 

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