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Old 25th August 2005, 09:35 PM   #1
zobsky is offline zobsky  India
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Default front horn designs - post your results / pics

relatively little DIY work going on here, compared to back horns.

since I can't afford $$$ for a pair of commercial front loaded horns ala oris, azura etc , ... i'd be interested in seeing what the members of this forum have achieved.

thanks
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Old 25th August 2005, 10:38 PM   #2
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This is a good link Round Wooden Front Horns Click the image to open in full size.
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Old 27th August 2005, 01:56 PM   #3
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Here's yet another way to do it with fibreglass...

http://www.steinmusic.de/horn/artikelee.html
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Old 27th August 2005, 02:20 PM   #4
AuroraB is offline AuroraB  Norway
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Have been eyeing at the Oris for a quite some time....
making horns in fiberglass is actually piece-of-cake, once you have suitable mold, but rumours have that fiberglass rings...
Any comments or ideas for damping.....???

Or any other ideas for materials than fiberglass or wood??
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Old 27th August 2005, 04:28 PM   #5
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Take a look at the link I posted. You will find the answers there. The cardboard "mold" becomes part of the horn, providing additional damping. Check it out.

There are also damping produxts available at auto supply stores than can be appliad to the back of the horn.
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Old 27th August 2005, 11:31 PM   #6
zobsky is offline zobsky  India
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thanks, .. seen those links before.

question: when building a 4 sided front horn with curved sides, ... how does one get the edges to meet up square.

One way to do it is to use a bandsaw (eg. http://www.volvotreter.de/pics/02240004.jpg in article http://www.volvotreter.de/pics_plans.htm ) but i don't have (or have the space for) a bandsaw. Is the only alternative the use of wood strips (eg Dr. Edgar's method in http://www.volvotreter.de/downloads/...ge-Horn-07.jpg ) ?
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Old 28th August 2005, 12:01 PM   #7
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You can certainly screw and glue sides that are not square, then go back with some fiberglass and smooth out the corners. I built some front horns with MDF sides and bent "hardboard" on the curved side. Wasn't pretty, but it was pretty straight foward building.
Joe
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Old 29th August 2005, 01:59 PM   #8
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Another cardboard / fibreglass option...

http://audioroundtable.com/PiSpeaker...ges/14408.html
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Old 29th August 2005, 02:21 PM   #9
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Quote:
Originally posted by AuroraB
Have been eyeing at the Oris for a quite some time....
making horns in fiberglass is actually piece-of-cake, once you have suitable mold, but rumours have that fiberglass rings...
Any comments or ideas for damping.....???

Or any other ideas for materials than fiberglass or wood??
Use this DIY hotwire / foam technique to make your own "suitable horn mold"...

http://www.interestingprojects.com/c...rframe03.shtml
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Old 29th August 2005, 03:26 PM   #10
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My experience using styrofoam and polyester resin was not good. Yhe styrofoam dissolved.

I am in the process of making a mold to cast a 24" front horn from portland cement or plaster of Paris. This back burner project started more than two years ago. I have tested the back half of the mold which is solid glass reinforced poly resin and steel mesh as a horn speaker with one of the wide range drivers I use in my Ultor loudspeaker designs and it sounded magically sweet! I am on the right track.

I may offer to bang these out as a service to audiophile DIY'ers when I can finish the tooling.
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