If you haven't already purchased the horn it might be wise to stick the the Altec 811 sectoral. Does it have to be as small as the one shown? If it does maybe consider looking through PE and finding a two bolt 1" that meets your needs. Here's the general area:
1" bolt on horn - Parts Express Ships Fast and Ships Free
This one is small and economical:
Dayton Audio H812 1" Exponential Horn 100x60 2-Bolt 270-304
If you don't find a bolt on horn you like here is an adapter for a screw on.
http://www.parts-express.com/pe/show...number=290-562





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