Ever think of building a Cornu Spiral horn? Now you can! - Page 64

guangui · 17th February 2013, 08:01 PM

Quote:

Originally Posted by Switters

Hi solhaga,
I had the same problem, I used vinyl glue to seal the back panel and this leaved some leakage. I tried to seal them pouring some glue from the horn mouth and then rotating the cabinet to let it flow along the corners formed by the plywood and the foamcore board.

In my experience vinyl glue is too liquid, it's easily absorbed by wood and "shrink" too much when drying. Next build I'll try a more dense glue.

Wouldn't Contact Cement be a good alternative?

solhaga · 17th February 2013, 08:04 PM

I use silicone sealant:

Switters · 09:23 PM

Quote:

Originally Posted by guangui

Wouldn't Contact Cement be a good alternative

I never tried contact cement but if it is fast setting or if there are solvent reacting with polystyrene I wouldn't use it, otherwise it should be ok.

Quote:

Originally Posted by solhaga

I use silicone sealant

From the photo it seems that horn throats are closed... or it's a trick of my declining sight?

solhaga · 17th February 2013, 09:32 PM

No, they are not closed. The foam I´m using is not rigid enough so I have to put spacers at the top. Like bridges.

Switters · 17th February 2013, 09:45 PM

Quote:

Originally Posted by solhaga

No, they are not closed. The foam I´m using is not rigid enough so I have to put spacers at the top. Like bridges.

Mmm... this could be an useful trick, thank you

Cal Weldon · 17th February 2013, 11:43 PM

solhaga, you, without a doubt, win the ugly award. They might be the best sounding of the bunch but OMG man!

guangui · 18th February 2013, 12:04 AM

Quote:

Originally Posted by Cal Weldon

solhaga, you, without a doubt, win the ugly award. They might be the best sounding of the bunch but OMG man!

LOL, but once he puts the front baffle in place you will not be able to see the mess inside.

xrk971 · 18th February 2013, 01:05 AM

Solhaga,
What are the channels made of? Black foam core or is that like vinyl? There are no points for internal beauty as long s it sounds good

if channels are foam core and cut cleanly, they seal nicely with cheap white glue. They are also stiff in compression and would not require bracing at throat.

turk 182 · 18th February 2013, 01:43 AM

well holy cow i was walking through the mall and i saw an "OPENING SOON" sign for a Dollar Tree store. soon i too will have foamcore at LAST!

hey can we change the name and call foamcore cornu's to cornFu's (the capital F is in praise of foamcore)

solhaga · 18th February 2013, 03:35 AM

Quote:

Originally Posted by xrk971

Solhaga,
What are the channels made of? Black foam core or is that like vinyl? There are no points for internal beauty as long s it sounds good

if channels are foam core and cut cleanly, they seal nicely with cheap white glue. They are also stiff in compression and would not require bracing at throat.

It is 5mm XPS foam that is normally used as floor underlay.

17th February 2013, 11:43 PM	#636
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	solhaga, you, without a doubt, win the ugly award. They might be the best sounding of the bunch but OMG man! __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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17th February 2013, 08:04 PM	#632
solhaga diyAudio Member Join Date: Jun 2009 Location: Värsta Götaland	I use silicone sealant:

17th February 2013, 09:32 PM	#634
solhaga diyAudio Member Join Date: Jun 2009 Location: Värsta Götaland	No, they are not closed. The foam I´m using is not rigid enough so I have to put spacers at the top. Like bridges.

18th February 2013, 01:05 AM	#638
xrk971 diyAudio Member Join Date: Oct 2012 Location: Virginia	Solhaga, What are the channels made of? Black foam core or is that like vinyl? There are no points for internal beauty as long s it sounds good if channels are foam core and cut cleanly, they seal nicely with cheap white glue. They are also stiff in compression and would not require bracing at throat.

18th February 2013, 01:43 AM	#639
turk 182 diyAudio Member Join Date: Oct 2012	well holy cow i was walking through the mall and i saw an "OPENING SOON" sign for a Dollar Tree store. soon i too will have foamcore at LAST! hey can we change the name and call foamcore cornu's to cornFu's (the capital F is in praise of foamcore)