Ever think of building a Cornu Spiral horn? Now you can! - Page 70 - diyAudio
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Old 13th March 2013, 09:15 AM   #691
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Hi!!
These are some pictures of the pair of cornus I'm currently building.
Thanks for such a good thread!! I couldn't follow it until now, and there's a lot of good info inside!

Click the image to open in full size.

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Click the image to open in full size.

They're not finished yet, but will post some updates soon!!
Take a look at my blog 22 nanofarads | Audio & Electronics Blog for further description and pictures of the build.

Regards,
Fran

Last edited by FranciscoPerez; 13th March 2013 at 09:23 AM.
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Old 13th March 2013, 09:19 AM   #692
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Fran,
Very nice work! You made it out of wood with a divider just like the real thing. Was it a lot of work to get to where you are now?
Can't wait to get your listening impressions.
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Old 13th March 2013, 09:36 AM   #693
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Glad you liked it!!
I'm sorry I couldn't figure out how to add clickable thumbnails to the post :S

To be honest it is a lot of work! This is one of my first speaker projects, and never built anything similar before. I feel comfortable with electronics, amp building etc, but wood work is totally new to me.

If I couldn't have CNC'd the middle plate, I would've never started this project. This would be the hardest part if done manually but with a CNC machine this is not a problem. Therefore, the hardest part for me has been gluing the entire spiral to the middle plate, and filling the remaining gaps with glue.

Anyway I'm far from finished yet!! Still have to glue the top and botom plates and add damping and the speaker. Not to mention white lacquering the whole enclosure.
There are still several things left to do, but can't wait to hear how all this sound!!

Hope it's worth the effort, I'll keep you up to date with this!!

Thanks again for the tips and all the valuable info inside this and the other threads in this forum!!

Regards,
Fran
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Old 13th March 2013, 09:45 AM   #694
xrk971 is online now xrk971  United States
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Fran,
Your courage to take on the Cornu challenge in wood is very admirable and more than many of us have - which is what led me down the easy (and maybe lazy) way of building the Cornu in foam core. It is very easy and can be done in several hours - I feel bad saying that because I know how hard you must have worked But you have an all-wood speaker that will sound great, look great, and will be quite a conversation piece in your home or wherever you plan to mount it. Do not worry - it will sound fantastic, especially since you did a great job by CNC'ing the channel pattern - which can be critical to how it sounds. Make sure you hang it on a wall - absolute must to get wall reinforcement of the horn mouth for the bass. It will not sound anything like its potential by sitting in free space in the middle of a room when testing there.
Good luck with the remainder of your build!
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Old 13th March 2013, 10:14 AM   #695
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Thanks for your kind words xrk971!
Hope everything ends up well. Building this has been challenging and a lot of fun! I'll soon be posting some updates!

Kind regards,
Fran
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Old 13th March 2013, 01:58 PM   #696
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I agree with X. Nice job Fran.

To post pics, hit post reply and go down to 'manage attachments'
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Old 14th March 2013, 07:55 PM   #697
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Thanks Cal!

This is a picture of the finished middle plate. Now it's time to sand everything and get rid of the unwanted glue.
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Old 15th March 2013, 12:26 AM   #698
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Fran,
That looks really nice - you are very good at this. Can't wait 'till you are finished and report back on the sound.
X
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Old 15th March 2013, 12:37 AM   #699
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Hey Fran,

How are going to glue the front and back?
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Old 15th March 2013, 10:27 AM   #700
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Thanks for the compliment X!! The picture is a little deceiving, I should sand the joints thoroughly yet if I want to get a more professional look.

About gluing the front and back plates, I'm not sure yet. The only idea I had in mind is to apply a strip of glue along each spiral arm, and then put the front (or back) in place. Once the front is in place, I'd put something heavy on top of the speaker to ensure everything makes good contact and let dry.

Do you have any other idea??
Prior to all that I'll sand the spiral arms a little just in case something's got different height. That way I'll be sure that the spiral arms make contact with the plate through all their way.

Forgot to mention that i haven't drilled the holes for the speaker cables yet. I should've done it before gluing to the middle plate, now It's gonna be more difficult to do.

Sorry if what I write is not easily understandable, I'm not very good at english
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