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Ever think of building a Cornu Spiral horn? Now you can!
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Old 7th April 2014, 08:27 PM   #1541
xrk971 is online now xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
For you my friend, Cal - no problem. I think the RS driver is already in my 150 driver long TS database. What are you looking for in a design? Bass extension or compactness?
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Old 7th April 2014, 08:32 PM   #1542
xrk971 is online now xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
Quote:
Originally Posted by edodo View Post
XRK,
Have you experienced with a cornu with only one horn, like a snail spiral. That way we could lower the frequency of the lowest note possible while still have a manageable speaker size??
No, but it is easy enough to simulate as it can be approximated as one long straight horn with side exit. Question is where should the exit go? Bottom? Up? You can get deeper bass extension but it may not be as smooth. With one horn you can use Hornresp to model easily enough even. What driver and size overall were you thinking of? Note that channel width will be very narrow if you want to get extra path length. This may add horn like peaks and harmonic distortion. It will sound like a brass horn full of harmonic content.
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Old 7th April 2014, 10:15 PM   #1543
Cal Weldon is offline Cal Weldon  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
Allright, internet is back Amazing how much you depend on it huh?

X, I am thinking about scaling it up a bit. If I make it 36" from the original squared off horn drawing and make it 5" deep, would that work or do you have other suggestions? Like would that make the driver chamber the right size or...
Is 32" enough or...
I would use thin ply front and back like before.
Attached Files
File Type: pdf Cornu orig.pdf (3.5 KB, 49 views)
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Old 8th April 2014, 11:45 AM   #1544
xrk971 is online now xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
Default Cornu for RS 40-1254

Cal,
Your hunch on sizing it was good. The RS 40-1354 will work very nicely in a 36 in x 5 in deep Cornu. Here are the simulation results assuming good amount of stuffing in the driver chamber and light-to-moderate stuffing in the channels up to split point. Mount the speaker 53 in (at centerline) above the floor to minimize floor bounce null. Let us know how the build goes and good luck!
X

SPL vs Freq:

Click the image to open in full size.

Cone displacement:

Click the image to open in full size.

Impedance:

Click the image to open in full size.
Attached Images
File Type: png Cornu6a-rs1354-freq-1m.png (36.2 KB, 339 views)
File Type: png Cornu6a-rs1354-displ.png (29.8 KB, 339 views)
File Type: png Cornu6a-rs1354-Impedance.png (29.5 KB, 338 views)
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Old 8th April 2014, 12:30 PM   #1545
Cal Weldon is offline Cal Weldon  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
Thank you very much.

This build will be slower than others. Dad gets back into town soon so a lot of the weekends are spent with him.
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Old 8th April 2014, 08:11 PM   #1546
gtoro is offline gtoro
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Good evening everybody, i'm looking to this project and thinking to built a low cost foam based sample with for example the 4" cinese dual cone speaker cheaper respect fostex, lowther, etc. Could i expect a good result form this driver and this size?
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Old 8th April 2014, 09:47 PM   #1547
Cal Weldon is offline Cal Weldon  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
If you have the parameters, someone might be able to help.
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Old 8th April 2014, 09:48 PM   #1548
Cal Weldon is offline Cal Weldon  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
Just found out that the repro places ahve only 36" paper and there is a 1" border so the biggest the new ones can be is 34".

You ok with that X?
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Old 9th April 2014, 12:00 AM   #1549
xrk971 is online now xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
You can print out over multiple sheets and tape together. 34 in can work but you will lose bass extension. I think you should try 36 if possible.
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Old 9th April 2014, 01:35 AM   #1550
Cal Weldon is offline Cal Weldon  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
ok. I will see what I can do. Thanks again
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