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Ever think of building a Cornu Spiral horn? Now you can!
Ever think of building a Cornu Spiral horn? Now you can!
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Old 16th October 2013, 04:45 PM   #1071
FranciscoPerez is offline FranciscoPerez  Spain
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Hey!!

Long time no post
I've been really busy all this time, but finally got the cornus finished!!
Lacquering and finishing the wood was really a tough job but it was all worth it!!
I wanted to drop a line here to thank you all for your help and info, it's because of you that they ended up so well!!

This is how they look like:

Click the image to open in full size.


I wrote a post in my blog with some additional pictures and info, if you want to take a look:

Spiral horn speakers under construction. Part3 | 22 nanofarads

Thank you guys!!
Fran
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Old 16th October 2013, 07:04 PM   #1072
Xerxes75 is offline Xerxes75  Netherlands
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Wow! That looks great. And like the "original" a double Cornu.
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Old 16th October 2013, 07:38 PM   #1073
FranciscoPerez is offline FranciscoPerez  Spain
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Glad you liked it Xerxes
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Old 16th October 2013, 08:03 PM   #1074
Cal Weldon is offline Cal Weldon  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
Very nice Fran. Everything looks so neat and clean.
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Old 17th October 2013, 12:04 AM   #1075
norman bates is offline norman bates  United States
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awesome
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Old 17th October 2013, 12:10 AM   #1076
ODougbo is offline ODougbo  United States
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That's a nice project, memorable for sure.
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Old 17th October 2013, 02:28 AM   #1077
xrk971 is online now xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
Very nice job on the Cornu's there Fran. The white lacquer looks great and I really like how they turned out. Looks a bit similar to my all white foam core Cornu's - no need to lacquer
How did you make the curved wooden channels?
X
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Old 17th October 2013, 09:09 AM   #1078
FranciscoPerez is offline FranciscoPerez  Spain
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Wow thank you guys!

I made an autocad file from the spiral layout and CNC'd the middle plate. Then I inserted long strips of 4mm okume plywood which bent at some extent through the middle plate, and glued them to it. The remaining part of the spiral (the inner part) was left because okume did not bend that much, and I had to cut small strips of it and glue them together to finish the form of each spiral's arm.

Lacquering the wooden channels was hard, because it was not possible to polish the surface as fine as the front and black plates, which are totally flat. If you touch the front and back plates they feel completely smooth, but if you touch the horn mouths they feel a little more rough. Anyway, nobody is supposed to touch the inner part of the horns, and they look as good as the front plate, just feeling a little more rough to touch.
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Old 12th November 2013, 12:17 AM   #1079
webber is offline webber  United States
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Default All I can say is WOW !!!

Hi All,

I want to give an extra thanks xrk971 and Cal for getting me inspired to build the Cornu speakers. I just finished the secon one on Sunday and got the stuffing right an hour ago. I built the 20" version with 3.75" walls and was lucky enough to be able to print any size drawing at work. The first one was done a few weeks ago and I have been listening at home and decided to bring it into work to show a few friends that are big Bose fans. They were shaking their heads in disbelief of the 3.5" Vifa driver was hitting the lows and the mids and upper range was so clear. I had the foam board before I found this thread because I have been flying R/C models for decades and also had some gap filling foam safe instant glue that made the build go quick. I noticed recently the Vifa drivers went on sale at PE for $9.90 so I bought 10 more, such a deal. I will be building more of these for gifts. Most of what I read is way over my head being a newbie so I was very pleased how well they sound. Thanks again to all for your input.

Scott (aka Webber)
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Old 12th November 2013, 01:10 AM   #1080
xrk971 is online now xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
Webber,
Congrats on the new Cornu's and having a good time amazing your friends at work. I did not know the Vifa's are on sale for $10 ea. That is a great deal. Post some pics please.
Regards,
X
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