Ever think of building a Cornu Spiral horn? Now you can! - Page 129 - diyAudio
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Old 6th February 2014, 03:26 AM   #1281
prezden is offline prezden  Canada
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Hi X- Yes the TB Bamboo were great- A little expensive for this project.

cheers
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Old 6th February 2014, 12:12 PM   #1282
xrk971 is online now xrk971  United States
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Originally Posted by prezden View Post
Hi X- Yes the TB Bamboo were great- A little expensive for this project.

cheers
I will suggest the Faital Pro 4FE35 for $25 ea. The published freq response curve looks just as good as the bamboo and it has 91dB efficiency. Get the 4 ohm version - they give lower THD and higher power with the TPA31xx amps.
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Old 6th February 2014, 07:33 PM   #1283
prezden is offline prezden  Canada
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Thanks X
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Old 7th February 2014, 08:41 PM   #1284
Halair is offline Halair  Norway
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One pair of Vifa TC9's arrived today, fingers crossed for sound by monday
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Old 12th February 2014, 12:35 AM   #1285
FozzZ is offline FozzZ  Canada
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Why do some of the spiral horns I've seen have a double layer, one in front of te other? There appears to be a duplicate spiral behind the first seperated by a wood layer. What purpose does this serve?
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Old 12th February 2014, 01:57 AM   #1286
xrk971 is online now xrk971  United States
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The wooden variety with double layer is how the original Cornu is built. It uses segmented pieces of thin wood and the middle layer has a slot cut in it to hold the segments in alignment. There is no acoustic benefit to having a middle layer - other than for it to force the the wave to travel down 8 horns rather than 4. The foam core method uses easily curved foam core that is held in place by hot melt glue which sets fast enough that fingers are all that is needed to hold the curve shape in place. Look at Sebastien's wooden cornu website to see how the wooden ones are built.
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Old 12th February 2014, 04:16 AM   #1287
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Three questions.

I am getting down to making the fins of the horn, can someone please remind me how far apart I need to make slits in order to curve the foamcore?

I seem to recall one side being better for making those slits. Is one side better?

I have the option of mounting the speakers against the wall. But the listener will be off axis then. So would I be better mounting flush to wall or toeing them out to face the listener?


Thanks
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Old 12th February 2014, 07:58 AM   #1288
xrk971 is online now xrk971  United States
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Curving the channels requires scoring cuts on the concave side. Cut deep enough to piece through top layer of paper. For right radius bends use 1 mm spacing and vary from there up to 5 mm spacing for gentle bends. Use round object with curve like a PVC pipe to form curve by pressing against strip of now scored foam on one side and palm on other side. Pre curve channels then glue section by section.

These work best flat against wall as wall helps to extend bass. Maybe make a clever angled small box where driver is to toe in driver but horns lay flat?

Good luck!
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Old 12th February 2014, 08:10 AM   #1289
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Maybe make a clever angled small box where driver is to toe in driver but horns lay flat?
This is going to open new perspectives !
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Old 17th February 2014, 09:04 PM   #1290
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Default 5" Tang Band

What can I say, it sounds great and it was easy. Thanks XR!
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