Ever think of building a Cornu Spiral horn? Now you can! - Page 72

Douglas Ingram · 20th March 2013, 01:14 PM

Quote:

Originally Posted by techbiker

Hey guys!

I just thought about a neat idea in the other foam core thread. Since vibrations appear to be one of the central issues of foam core, has anyone thought about damping vibrations with a liquid damper? You could possible apply it to the interior and exterior of the cornu.

DEI 050220 Boom Mat Spray-on : Amazon.com : Automotive

When I get around to making another set of cornu spiral horns, I will coat them with a spray like this. If anyone is making a set at the moment though, I encourage you to give this a try and report your findings! The main issue that we've discussed is that it might be petroleum-based and may dissolve the foam, although this spray appears to be mild.

I can't imagine how this stuff would work in this situation.

FranciscoPerez · 21st March 2013, 02:03 PM

Hi there!
Finally wired the cabinet and glued the back plate and everything seems to be ok!! Used an utp twisted pair like you suggested, and both wires go through the spiral after cutting some small notches on top of it. This way couldn't be easier!! I'm really happy with the result and did not need to drill a single hole.

Each cable measures around 1.2ohms, hope this is ok.
Thanks for all your help!! Hopefully the enclosure will be finished this week and ready to be lacquered! I'll keep posting some updates.

Kind regards,
Fran

Cal Weldon · 21st March 2013, 02:42 PM

Nice work Fran, looking forward to the results.

prezden · 21st March 2013, 04:42 PM

Looking good!

FranciscoPerez · 21st March 2013, 04:55 PM

Thank you both! It would be great to see some pictures of your cornus Prezden!

prezden · 21st March 2013, 05:43 PM

Fransico-
The 2 that I have completed so far are on page 34 - post 332 and page 41 - post 405. I'm just starting work on another pair. Lots of fun making them and not much money involved

prezden · 21st March 2013, 05:45 PM

Whoops- sorry I spelled your name wrong

FranciscoPerez · 21st March 2013, 06:08 PM

They look great !!!

zayne742 · 22nd March 2013, 12:42 AM

Francisco,
Those do looks very nice. Just curious, what dimensions did you build these?

FranciscoPerez · 22nd March 2013, 07:49 AM

Thanks Zayne

,
middle plate is 75x75x1cm and front and back are 70x70x1cm baltic birch ply.
The spirals are made from okume plywood 4mm thick in strips of 14cm, so the entire speaker's depth is 16cm.

21st March 2013, 02:42 PM	#713
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Nice work Fran, looking forward to the results. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

21st March 2013, 04:55 PM	#715
FranciscoPerez diyAudio Member Join Date: Jan 2013	Thank you both! It would be great to see some pictures of your cornus Prezden! __________________ www.22nanofarads.com

21st March 2013, 06:08 PM	#718
FranciscoPerez diyAudio Member Join Date: Jan 2013	They look great !!! __________________ www.22nanofarads.com

22nd March 2013, 12:42 AM	#719
zayne742 diyAudio Member Join Date: Jun 2006 Location: Looavull	Francisco, Those do looks very nice. Just curious, what dimensions did you build these? __________________ Fliping Switches, Pushing Buttons, and Turning Knobs.

22nd March 2013, 07:49 AM	#720
FranciscoPerez diyAudio Member Join Date: Jan 2013	Thanks Zayne , middle plate is 75x75x1cm and front and back are 70x70x1cm baltic birch ply. The spirals are made from okume plywood 4mm thick in strips of 14cm, so the entire speaker's depth is 16cm. __________________ www.22nanofarads.com


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21st March 2013, 04:42 PM	#714
prezden diyAudio Member Join Date: Nov 2008	Looking good!

21st March 2013, 05:43 PM	#716
prezden diyAudio Member Join Date: Nov 2008	Fransico- The 2 that I have completed so far are on page 34 - post 332 and page 41 - post 405. I'm just starting work on another pair. Lots of fun making them and not much money involved

21st March 2013, 05:45 PM	#717
prezden diyAudio Member Join Date: Nov 2008	Whoops- sorry I spelled your name wrong

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