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Old 7th December 2012, 12:42 AM   #441
6L6 is offline 6L6  United States
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One spiral complete! The next will be a mirror image, like Cal's.

Click the image to open in full size.
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Old 7th December 2012, 12:57 AM   #442
xrk971 is online now xrk971  United States
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6L6,
Congratulations on this big step . It wasn't too hard was it?

Last edited by xrk971; 7th December 2012 at 01:05 AM.
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Old 7th December 2012, 01:05 AM   #443
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Not at all. But there is a learning curve. (no pun intended, but it's not that bad, actually...) In fact what I learned on the way (mostly gluhandling, to invent a word...) makes me wonder if I should just start again... I mean, there is about 12 bucks worth of materials there. No big deal.

But I won't make that decision until I bond the top to the spiral. Which might be done with liquid nails (it can span a bit of gap) because there was some sloppy cutting of the foamcore before I figured out how to to it cleanly.

As with anything, there are things you need to know before building one that can only be learned by building one.
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Old 7th December 2012, 01:20 AM   #444
xrk971 is online now xrk971  United States
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It looks pretty good to me. As long as it is sealed tight, it will sound fine. The sound waves are the only ones who will see the internal imperfections, which don't affect sound quality. The outside will look great - cabinet grade birch plywood. Good luck eith the face and liquid nails.
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Old 7th December 2012, 02:15 AM   #445
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Quote:
Originally Posted by 6L6 View Post
But there is a learning curve.
<snip> that can only be learned by building one.
I have learned much. Some has been rewarding, some well..
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Old 7th December 2012, 02:22 AM   #446
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...so I did the grill cloth today. I didn't think it was that involved, I've done grills that way in the past but I forgot that this was more than 30 feet. Makes me question my choice of materials. Took me than 2 hours.

Gotta give up the computer, SWMBO needs it for a bit.
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Old 7th December 2012, 03:00 AM   #447
xrk971 is online now xrk971  United States
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Originally Posted by Cal Weldon View Post
...so I did the grill cloth today. I didn't think it was that involved, I've done grills that way in the past but I forgot that this was more than 30 feet. Makes me question my choice of materials. Took me than 2 hours.

Gotta give up the computer, SWMBO needs it for a bit.
Looks good Cal. You used hot melt to hold the cloth on? I noticed the wood floor ( or Pergo?) you have there - that might make nice material for front panels....
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Old 7th December 2012, 03:30 AM   #448
xrk971 is online now xrk971  United States
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I finished one Son of Conucopya or micro-Cornu spiral horn today with driver mounted. I have not had much of a chance to listen but it does sound good - lots of extra bass and room filling sound from the edges. Of course the bass doesn't go as deep as the tc9's as the driver has an Fs of around 200 Hz and the channels are tuned around 87 Hz I think. It really will be over the top for a desktop speaker for my pc but I think it will work well on little stands (like the ones used to hold plates up). I will have to await full judgement when I can get both left and right to listen to as it is not fair to judge it in mono and with such a cheap no-name driver scrounged from a cheap pc speaker. You can see how small it looks bext to the 20 inch minis. I actually left enough room to put a smaller 3 in driver in this cabinet. Maybe the TB W3-881si they have on clearance at PE?
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Last edited by xrk971; 7th December 2012 at 03:38 AM.
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Old 7th December 2012, 07:07 AM   #449
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I'm just a spectator right now, but this is a very intriguing (seemingly easy) DIY project! Some thoughts: (1) has anyone tried using pre-made material for the spirals? I am no handy-man, but here are some ideas: vinyl moulding, weather stripping (if wide enough), or even a garage door seal like a visiting dog destroyed in my house several summers ago like:
http://www.lowes.com/pd_290249-1410-...t_avg_rating|1

This product is 2.75" wide ... at least ballpark for proper width (or is it?);

(2) How much design is required for such a speaker? I know zero about horns. From a quick read of the thread the design seems to be "forgiving" but why not try for the best?
(3) This seems a simple idea -- any commercial examples of it?

Last edited by Soldermizer; 7th December 2012 at 07:24 AM.
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Old 7th December 2012, 10:00 AM   #450
xrk971 is online now xrk971  United States
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Quote:
Originally Posted by Soldermizer View Post
I'm just a spectator right now, but this is a very intriguing (seemingly easy) DIY project! Some thoughts: (1) has anyone tried using pre-made material for the spirals? I am no handy-man, but here are some ideas: vinyl moulding, weather stripping (if wide enough), or even a garage door seal like a visiting dog destroyed in my house several summers ago like:
Shop Frost King 18' Garage Door Replacement Seal at Lowes.com

This product is 2.75" wide ... at least ballpark for proper width (or is it?);

(2) How much design is required for such a speaker? I know zero about horns. From a quick read of the thread the design seems to be "forgiving" but why not try for the best?
(3) This seems a simple idea -- any commercial examples of it?
Design is limited to scaling overall size and depth of channel to match driver piston area. I'm sure someone will model this soon and that will open up the design. It is forgiving though.

Commercially made by Cornu in Germany. That is why we call it Cornucopya.

Other materials for channels are always welcome. They need to be structurally stiff in direction perpendicular to bend but easy to bend.

Last edited by xrk971; 7th December 2012 at 10:13 AM.
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