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Old 25th November 2012, 07:38 PM   #51
xrk971 is offline xrk971  United States
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It just occurred to me that if you use big drivers like a 5 incher, you will need the depth for the full sound. This can be done by hand tacking 2 horns on both sides of one panel with hole cutout, then gluing the tops and bottoms on to get 8 horns per speaker like the original Cornu. Still is faster than messing with a divider panel that needs the channels cut out. Also, you may need to use a masonite panel as foam core board is too small for 70 cm x 70 cm dimension.
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Old 25th November 2012, 07:39 PM   #52
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I am seeing stuff here in Canada that is 4X8 sheets @ 1/4" RynoBoard is it?
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Old 25th November 2012, 07:43 PM   #53
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Quote:
Originally Posted by Cal Weldon View Post
I was thinking about using wood for the front and back and holding them together with bolts inside tubular sleeves. I would need a lot of help with these.
Use the jpg image plan from here http://sebastian-pitkanen.blogspot.c...copy-horn.html for your project, it should work as this was designed for 5 inch horn. Make the walls out of foam core board and hot melt glue to wood panels. You can bolt four corners for extra strength and maybe use 4 bolts with tubes where the speaker screws are. This sounds like fun and doable in a weekend. Have fun, let me know if you need more tips. I have not tried Ryno Board but it looks like it should work well as it is thicker and stiffer.

Last edited by xrk971; 25th November 2012 at 07:47 PM.
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Old 25th November 2012, 08:33 PM   #54
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I will have to source the board. It doesn't seem like it is a stocked item around here. I agree with the extra bolts where the driver is. Also, it would be nice to do it in one go rather than two horns. Two horns = twice the chance to screw it up.

Yes I will have many questions for you especially concerning technique. Your hot melt, do I read that as a hot glue gun with the whitish sticks that you put in the back? If so great, I have that, if not please explain.
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Old 25th November 2012, 09:41 PM   #55
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Quote:
Originally Posted by Cal Weldon View Post
I will have to source the board. It doesn't seem like it is a stocked item around here. I agree with the extra bolts where the driver is. Also, it would be nice to do it in one go rather than two horns. Two horns = twice the chance to screw it up.

Yes I will have many questions for you especially concerning technique. Your hot melt, do I read that as a hot glue gun with the whitish sticks that you put in the back? If so great, I have that, if not please explain.
Yes hot melt glue gun with sticks. I sized the horn entrance for your driver as a 1.5 in wide channel with the depth of the walls as 3 inches. This makes the Ao equal to Sd of the driver. Three inches is not too thick and you can stick with one layer of horn channels. :
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Old 25th November 2012, 09:56 PM   #56
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There are Dollar Tree stores in BC, have you checked there to see if they have it? I would play around with the cheap stuff first to get some experience before making it with the premium ryno board stuff. Get lots of glue sticks, they go faster than you think.
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Old 25th November 2012, 11:35 PM   #57
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I am seeing stuff here in Canada that is 4X8 sheets @ 1/4" RynoBoard is it?
I've worked with a simular product here in the states called "Gator Board".
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Old 26th November 2012, 01:00 AM   #58
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I think they're both made in the States, no?
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Old 26th November 2012, 02:50 AM   #59
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Default First sound from Cornu mini horns

I just had a few minutes to listen to the Cornu mini horns after hanging them in the recreation room. I was not really expecting much because when I look at the design, it just seems too open - there are all these open channels, I mean there really isn't a box that is closed. I put on Suzanne Vega - My Favorite Plum because it has a good test of the bass response and beautiful vocals. I was absolutely blown away, I mean my jaw dropped, and I have an ear to ear grin and could not stop listening, except that I have things to do like go to work. The sound stage is amazing, and it is so open and full bodied. Just listen to me, I sound like a wine critic describing a wonderful Petit Sirah... Put it this way, I have never heard anything like this before from ANY speaker, let alone a pair of 3.5 in drivers in a foam box. Just flabbergasted. I love these spiral horns and am a true believer now. The sound output from the horns radiates in a 360 degree pattern from the edges of the thin cabinet and really makes the room feel bigger than it is, but you do not lose the imaging because of the detail from the two point source full range drivers doing their job. You can walk around and the sweet spot is rather large. I am also noticing that they are very efficient - I am only using the Lepai at half setting and the sound just fills the room.
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Old 26th November 2012, 01:38 PM   #60
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by cochleus View Post
I've worked with a simular product here in the states called "Gator Board".
This Gatorboard product looks really nice with wood fiber veneer. How hard is it to cut - does it require a saw or is an X-Acto knife still sufficient? This might be the ticket for an upgraded spiral horn - now that I know the design sounds awesome.

I have some leftover Pergo "wood" laminate that seems like it would make an excellent facing for these foam projects. You can link multiple ones together to get desired width. Has anyone made speaker cabs out of this material?
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