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Old 29th December 2012, 09:41 PM   #961
xrk971 is online now xrk971  United States
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Quote:
Originally Posted by bcmbob View Post
xrk971, got a link? not sure about "the other thread".
Bob,

Post 188 and 191 in the cornu thread.

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

Last edited by xrk971; 29th December 2012 at 09:43 PM.
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Old 30th December 2012, 03:30 PM   #962
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Default Cardboard box

Click the image to open in full size.

Cut up a box, taped it tight, dropped in some 3 inch FR drivers hooked it up and it sounds good.
For a free box.

I was thinking about trying out a Cornu spiral out of card board and dropping in these drivers.

Is a 24" or smaller size a safe way to go with these 3" drivers? They aren't too deep maybe 2.5".
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Old 30th December 2012, 03:41 PM   #963
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I thought about cardboard also. But if you find the right "Dollar Store" the $5 investment in foam board for two 24s provides a very stable and strong build.
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Old 30th December 2012, 06:21 PM   #964
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Quote:
Originally Posted by bcmbob View Post
I thought about cardboard also. But if you find the right "Dollar Store" the $5 investment in foam board for two 24s provides a very stable and strong build.
I second what Bob says.

I used to build with cardboard but find that it is not as stable as it bends in one direction easier than another and the color is just plain objectionable. Having said that, I would not discourage trying it out in cardboard as for the spirals, cardboard nicely bends in one axis and is stiff in other without requiring the scoring with a razor. You can use double layer cardboard for the faces which is stable and strong in both dimensions. In a pinch, you can glue two sheets of single ply cardboard with grain crossed at 90 deg. Let dry and use for face. You will have to cover the cardboard with vinyl contact paper, paint, cloth, etc as the kraft brown color is fugly. Notice how most speaker cone paper is black? They add carbon black to it otherwise it would have the color of brown cardboard and people would ask why they are paying so much money for a cardboard driver .

Really though, if you can locate a Dollar Tree with the 20x30 in foam core boards, buy a dozen or so and you will have lots of speaker building adventures ahead of you.

Those drivers look perfect for trying on this project. What model and size are they?

Good luck!
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Old 30th December 2012, 06:37 PM   #965
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This is my guess:

The Madisound Speaker Store
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Old 31st December 2012, 11:45 PM   #966
xrk971 is online now xrk971  United States
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I am out of foam core... the hands are getting restless again not having built something with a razor and hot melt for 2 weeks now. Another run to Dollartree is in order, I might have to buy a whole case of 25 sheets this time like Cal does SWMBO actually said she will pick it up for me if she happens to go by the store!

I have been day dreaming about building a 50 driver line array using a foam core open baffle cabinet with the $1 Aurasound 3 in neodymium full range drivers from Madisound. The drivers are $1 if you buy 50...

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Old 31st December 2012, 11:51 PM   #967
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I love your SWMBO. Please mention my name the next time you give her a big hug.

The cases up here are 50 sheets. They are so heavy I can only carry half a box at a time.
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Old 1st January 2013, 01:06 AM   #968
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Quote:
Originally Posted by xrk971 View Post
I have been day dreaming about building a 50 driver line array using a foam core open baffle cabinet with the $1 Aurasound 3 in neodymium full range drivers from Madisound. The drivers are $1 if you buy 50...
50 drivers at 82 mm C-C means a 4100 mm line array. You got 14 foot ceilings?

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Old 1st January 2013, 01:27 AM   #969
xrk971 is online now xrk971  United States
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50 drivers at 82 mm C-C means a 4100 mm line array. You got 14 foot ceilings?

dave
Actually I have 24 ft ceiling in family room, but I meant 25 per side for 7 footers. They are 16 ohm though, I am not sure how to wire to get 4 or 8 ohm total unless 16 drivers per side.
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Old 1st January 2013, 01:48 AM   #970
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18 drivers: 3 sets in series of 6 in parallel = 8 ohms
20 drivers: 4 sets in series of 5 in parallel = 12.8 ohms
21 drivers: 3 sets in series of 7 in parallel = 6.9 ohms
24 drivers: 3 sets in series of 8 in parallel = 6 ohms
24 drivers: 4 sets in series of 6 in parallel = 10.7 ohms
25 drivers: 5 sets in series of 5 in parallel = 16 ohms

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