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Your on the right track but I would use Bending Ply, it is made for this application. Just have to specify which direction it bends in when you buy it.
An no, you don't find it at the Big Box stores.
I have found how much a boat is used is inversely related to how much it weighs.
Kudzu Craft Lightweight kayaks
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I'd look at 1/4" OSB. It seems bendy enough any time I've used it
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Bending ply 2" thick? Not easy or cheap.
This is a perfect application for a traditional "Brick mold".
Use poplar cut into short sticks in a staggered glue up to create the basic curve then cut/grind/sand it smooth and to the final dimensions. Veneer over this.
3/4" poplar stock is inexpensive, poplar has been the substrate wood choice for hundreds of years and the brick mold uses smalller parts laminated together to resist movement, warping or cracking over time.
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Do you care about the sound quality? If so, choose bending ply or make your own by kerfing the wood before you bend it. A series of narrowly spaced kerfs will allow the substrate to bend. A dense core to your horn will help in keeping the sound inside the horn vs. having the whole horn vibrate. I'm assuming the horn is simply to direct the sound in a certain direction. Most audiophile sites use baltic birch as the core.
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Allan Hill
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I'm not sure about the quality of bendy-ply you can get in your area. But in mine, the inner and outer surfaces are ROUGH!
Talk about telegraphing through the veneer!
Does a wooden audio horn need to inert without providing its own sympathetic frequencies?
If so, I'd recommend MDF - inert and dense. Evil for dust, no question but you'll probably contribute minimal unwanted additional frequencies.