Plans for Alfredo Horn from Alf Lepp - Page 3 - diyAudio
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Old 13th November 2013, 02:21 AM   #21
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Thanks Dave,

I have pretty much done as you have suggested except calculate the angles. I'm going to have friend do it up in cad and see what happens. I will post the results when I have them. As for the commercial rights... I have not been able to find anything on Chris Power, Alf or the club he belonged to.
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Old 16th November 2013, 12:19 AM   #22
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Well tomorrow begins the cutting of this horn and I plan to keep good photo record of everything. Stay tuned
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Old 20th November 2013, 02:10 AM   #23
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Well, it may not be much to look at but it was a lot of work to interpret the drawing and put it down on the side panels. I've cut the pieces for around the back of god horn but it's just a pile of wood. Altogether it will be 48 pieces, many different angles. 18 mm maple ply. 1m x 550cm.
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Old 20th November 2013, 02:12 AM   #24
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The horn is not called the god horn....that's my new phone interpreting text. I couldn't attach photos from my phone so I'll figure out how to do it.
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Old 23rd November 2013, 08:32 PM   #25
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Default alfredo build pics

http://imageshack.com/a/img440/2840/m51m.jpg

http://imageshack.com/a/img62/603/0s34.jpg
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Old 8th December 2013, 10:29 PM   #26
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I have a clean CAD version of the plans if anyone wants to PM me.
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Old 21st December 2013, 09:54 PM   #27
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All the wood cut and ready to be glued in place.

http://img194.imageshack.us/img194/8876/mwuf.jpg
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Old 21st February 2014, 03:28 AM   #28
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Default The initial build is almost done, next finishing

Here are a few more shots. Still have a couple of deflectors and chokes to add and then staining. Are there any horn builders out there with some experience with damping?

https://imageshack.com/i/0z15yxj

https://imageshack.com/i/f1dj19j

https://imageshack.com/i/0nuq4xj
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Old 16th March 2014, 04:46 PM   #29
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almost done with the sanding. Attached two links to the profiles of the horn. I have chosen to leave out the last deflector on the bottom of the mouth. My thanks to Bando for all the help in getting the angles right.

Any thought on finish or damping would be appreciated.

https://imageshack.com/i/0x79ulj
https://imageshack.com/i/b5d22qj
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Old 16th March 2014, 06:20 PM   #30
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It is likely the horn was designed to use no damping except maybe in the initial chamber. I would at least line that with cottom or wool felt.

After that lining on the transitions (points at the folds) to help kill HF getting thru the horn -- the horn has smoothish transitions which will help pass HF you don't want gettingout the mouth.

Lastly experimenting with polyfill near the start of the horn to control the relative bass levels.

These last 2 really require being able to temporily attach the side so that it can be removed and yet be fully sealedup -- best to use draft exclusion tape (weather seal) and lots of screws.

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