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Posts: 52 | Thanked: 191 times | Joined on Apr 2010
#6
http://en.wikipedia.org/wiki/Horn_%28acoustic%29
That's all I got so far

Not sure about the material, may be I can make a model that the horns can be tilted up/down by assembling two printed materials to make the total cost cheaper in case that the horn will be better in metal.
 

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