What horn profile should I use when I turn my new horns - diyAudio
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Old 2nd February 2015, 11:32 PM   #1
djn is offline djn  United States
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Default What horn profile should I use when I turn my new horns

Hi All. I've been turning for a couple years now and would like to experiment with other horn profiles. I currently have the wood 350HZ tractrix horns and I'd like to try something different.

I now cross at 700hz to the horns then 7khz to the big *** Heils. I want to keep those crossover points.
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Old 3rd February 2015, 01:30 AM   #2
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djn,

You could try an oblate spheroid profile as Cessaro horns use. Dr. Bruce Edgar prefers tractrix for the midrange but since you are able to turn any profile you choose, give it a shot and see which profile sounds best to you. Cessaro speakers are truely world class !!!
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Old 3rd February 2015, 06:02 PM   #3
djn is offline djn  United States
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Thanks Hot. I looked up Oblate Spheroid and saw images that are oblong and that is too hard to turn on my lathe. Is there a round version???
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Old 3rd February 2015, 06:17 PM   #4
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djn, what is the maximum diameter you can turn?
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Old 3rd February 2015, 07:26 PM   #5
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djn,

The horns I am talking about are all round. Check the Cessaro speaker site ( Germany ) for a look at their designs.

Also look up The Lansing heritage site under " Daniels speaker " where he shows how he turned the horns and the dimensions.
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Old 4th February 2015, 12:17 AM   #6
djn is offline djn  United States
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Thanks Hot. I can turn 30" inboard and 88" outboard.
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Old 4th February 2015, 12:51 AM   #7
xrk971 is offline xrk971  United States
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Tractrix sounds great. Make a profile template using Volvotreter's spreadsheet.
http://www.volvotreter.de/dl-section.htm

Have a listen to a foam core tractrix here.
Presenting the Trynergy - a full range tractrix synergy.
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Old 4th February 2015, 01:47 AM   #8
djn is offline djn  United States
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hi X, I have been running 350hz wood tractrix horns for 10 years now. They sound great but I thought I would try something different. The lathe is calling!
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Old 4th February 2015, 02:52 AM   #9
jcx is offline jcx  United States
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the Oblate Spheroid waveguide has a circular cross section - just revolve a hyperbola about the mirror symmetry axis between the 2 branches

quickly approaches a cone of constant angle a few times the throat diameter away from the entrance
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Old 4th February 2015, 04:20 AM   #10
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I have no real business posting here, but what the heck...

If you want something different than tractrix, I suspect there are only two profiles worth trying. One is the oblate spheroid already mentioned. This would put you into Earl Geddes' camp - low diffraction, low HOM generation, constant directivity so a wide listening area but much EQ needed to flatten the naturally falling on-axis HF response.
Click the image to open in full size.

The other would be the Le Cléac'h profile. More directional than the OS, naturally flatter on axis, highs will drop off axis, small sweet spot, more single-listener oriented. A bit more challenge to turn as the profile continues well around the mouth of the horn, but that contributes to the intended wave-launch.
Click the image to open in full size.

But hey, what do i know?
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