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In the Forum: Horn-Loaded Speakers
In the Thread: Another time aligned 5-way horn project
Post Subject: Do not panic...Posted by Romy the Cat on: 10/18/2015
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 Murataltuev wrote:
I did some experiments today again with GOTO in my existing horn and it is obvious for me that I need different horn for GOTO.

Here we go. Now you got it.

 Murataltuev wrote:
Existing horn was modelled and designed for Supravox and I see perfect curve with it.But GOTO in it shows same curve for 50-100Hz but then drops significantly till 400Hz and then rises to the same level till 1000Hz. But even with this terrible frequency response I hear sound of another league!I tried to return to Supravox, because I have no idea what horn I need to make for this GOTOs, but can't any more.
I want GOTO's transparent, lite and airy bass.

Can someone suggest me what kind of horn to make for GOTO?Here in Moscow it is very cheap, so I can try to make different ones.The only problem is that it can't be longer than 2 meters.
Please, help! 

I do not think that anybody would “suggest” what horn you need for them. There are tons of Goto systems out there, mostly in Asia and most of them do not work properly. There are many reasons why and one of them that there is not a lot of sensible horn system designer worked with Gotos. Even those who did play with Goto hardly even saw the SG-146LD. 
 
It is 4” exit with very 1.9T diaphragm. The drivers with such high flux are very atypical for bass. If you played with variable flux (electromagnet) them you know that lower frequency is beneficial for lower flax. If you driver let say 300Hz then you get much better bass at 1.3T then at 1.7T. Gut it would be all true for conventional compression driver that we get used to. The 146LD is not a conventional and has the diaphragm and suspension designed to work in bass at a very magnetic flux. How good the design and how to take advantage of positive thing of the design and how to hide the negative is the key for self-education. 
 
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. Anyhow, do not be so much worry about the sickout on the Goto response – you will have a bigger fish to fry. You 6 feet objective are kind of irrelevant to say frankly. 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. Now you will know the dimension of your midbass channels and now you would need to think HOW to locate the midbass channels relative to the rest of the system in order to preserve the time alignment, the room usability and esthetics, the direction the MF will come from, the integration aspect and many other subjects. In my mind to bid a horn is very simple, to put it all together as unified design idea is very complex. I am not trying to suck my own dick but look at my 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. 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

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