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

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#1,403
Yep, I'll use your method when I come around to do the real things.

Unfortunately, in my case, wife was not too impressed. In fact, she said "what is that ugly box?"

Hmm... will try to turn them into some kind of art, like the printed ones I saw, or maybe even painted.
 
#1,405
xrk971 said:
Giuseppe,
You are one of the lucky ones who has such a nice driver. The Eikona's are very special drivers that deserve a special Cornu. If you want to fully utilize the Eikona's capabilities, I recommend an extra large but thin Cornu that is 34 in x 4 in deep - that will give deep bass extension down to mid 40 Hz while keeping the sound balanced. Because of the large size, I recommend you make the front and back out of thin 5 mm plywood and use foam core for just the channels so that they can be curved and glued. Use stuffing in the main driver chamber and loosely stuffed in the horn channels leading from the throat to the bifurcation point. Put the stuffing in a porous cheesecloth "sock" with a string tied to it on both ends so you can pull it out to adjust amount of stuffing inside the sock, and pull it back into position.

Here are the results of the simulation for SPL vs Freq, Impedance, Cone Excursion.

It is important to mount it on a wall at the correct optimal height of 45 inches from the floor (adjust to taste but start there).

Good luck!

Cheers,
X
Click to expand...



Thousand Thanks, XRK971, your words help me a lot.
34 inch is a little big for the wall they are intended to stay, but think will do something between 30 and 34 inch.

And thanks for the plywood suggestion.

Now I nedd to identify where to buy the foam.
Is there any code os something to search?

Lots of thanks again
 
#1,409
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#1,410
gmonno said:
Thousand Thanks, XRK971, your words help me a lot.
34 inch is a little big for the wall they are intended to stay, but think will do something between 30 and 34 inch.

And thanks for the plywood suggestion.

Now I nedd to identify where to buy the foam.
Is there any code os something to search?

Lots of thanks again
Click to expand...

Let me know what your max size is? 30 inches?
 
#1,413
xrk971 said:
You might try flexible or "bendy" plywood. Here is an example and it looks like they may have distributors in Europe.

KoskiFlex - Thin and flexible birch plywood | Koskisen Oy

Koskisen Spain and Portugal

Calle Eras, 20, Planta Baja, Local 2
28411, Moralzarzal (Madrid)
Spain
firstname.lastname@koskisen.com

There is a foam board distributor in Germany: Crescent Europe - Best of Passepartouts
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This would be fantastic, and they are near Madrid, only 20Km far.
I'll call them tomorrow, hope will not be obliged to buy a 100m roll. 🙂

Many thanks
 
#1,414
gmonno said:
Yes, 30 inches would be max size, as the wall has 90 inch length


As for the foam, what about using CORK?
Has anyone tried it?

And I've found foam here in Madrid, there are places were to buy depron


Thanks
Click to expand...

Just make it 30 in x 30 in x 4 in deep - should work fine - 52 Hz reach (-3dB point). Cork is too soft and flimsy to make a rigid channel wall.
 
#1,417
xrk971 said:
Squiffy,
Thanks for posting the video! iPhone video probably doesn't do it justice. Looks very nice and glad you are enjoying it.
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The iPhone just doesn't do them justice.

X I am currently sitting with the dog chillaxing to the sound of Griegs Peer Gynt Suites and Piano Concerto and the sounds filling the room is just blowing me away! The bass is rumbling my feet yet every tiny little note including the tings on the triangle is perfectly clear. I can almost hear the swish of the conductors baton it's so defined. These puppies are definitely made for classical music without doubt.
 
#1,419
Last post tonight and just wanted to say Muddy Waters runs deep and clear on the Cornu's

Wow the blues are sweet. I cannot believe a home made turntable and a set of nothing drivers in a packing case could produce such fantastic sounds.

Now where did that post about the tall horns out of foam board go 🙂
 
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