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Ever think of building a Cornu Spiral horn? Now you can!
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Old 18th February 2015, 06:56 AM   #2041
giantstairs is offline giantstairs  Spain
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Sounds like a leak in the cornus. Can you get in the cabs to seal with silicon?
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Old 18th February 2015, 07:29 AM   #2042
gtoro is offline gtoro
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Last night a quick test with only back side glueded just for smell the "flavour", non bad at all.....
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Old 22nd February 2015, 05:29 PM   #2043
gtoro is offline gtoro
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First finished ..Click the image to open in full size.

And a good confermati on of initial impressions, clean not so deep in low but very pleasant to listen

Last edited by gtoro; 22nd February 2015 at 05:35 PM.
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Old 22nd February 2015, 05:37 PM   #2044
xrk971 is online now xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
Nice work! I can't see your picture too well - it is tiny and won't enlarge.
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Old 22nd February 2015, 06:13 PM   #2045
gtoro is offline gtoro
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I try .. Click the image to open in full size.
Click the image to open in full size.
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Old 22nd February 2015, 06:13 PM   #2046
gtoro is offline gtoro
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The photo was by smartphone..
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Old 22nd February 2015, 07:28 PM   #2047
xrk971 is online now xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
Gtoro,
What driver is that? Looks like an "Air" with copper phase plug and whizzer.
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Old 22nd February 2015, 08:30 PM   #2048
gtoro is offline gtoro
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A chinese driver i posted on 1558, long time to receive them and no time to work... So just now i finish my speaker, i don't try other speakers but what i listen from them is not so bad, actually the other channel loudpeaker is coming from main system and is a tannoy driver.
In comparison the sound of cornu lose some body in low frequencies , but is incredible how low is the difference compared to a more big and expensive speaker.
Last think is that drivers needs a burning time, as long sa they work the sound will better in particular in the extremes. Maybe people in this forum know that but i'm happy to share my esperience. Thanks a lot again xrk, your project is very fun to build and sound very nice
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Old 1st March 2015, 09:05 AM   #2049
gtoro is offline gtoro
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Click the image to open in full size.

The job was done.
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Old 1st March 2015, 10:46 PM   #2050
colinegreen is offline colinegreen  United States
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Default Spiral BLH boom box version 3

My latest design iteration -

Now based on a 3" driver. I am thinking the Tang band W3-1878. The overall dimension is 12" x 20". The horn is 90" long down the middle. The narrow end is 0.5" nearest the driver, and the spiral grows to about 2" before widening out to the biggest mouth I can fit in the overall box. Grid is 1".

Is this good enough to try to build, or should I make refinements first?

I have a pretty good technique down for making these now in my computer software, so new versions are not hard to make.

My hunch is that the horn does not expand enough in with as it spirals around. There is an exponential function in there, but scaled and manipulated to make it fit.

xrk971, what do you think?
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