And how does the different horn material (e.g. wood/plastic/metal) affect the sound?

Thanks.

It does both of those.

Just as you would expect, but the shape of the horn influences the sound and soundstage much more than the material itself.

In that case, is there any benefit of using wooden horn besides good look? Or we can make a horn just as good with plastic?

Thanks.

• Characteristics of various horn flares

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That said, there is a difference in how different materials ring. The bell modes of a given horn made from different materials will be different. A metal horn might ring sharply, whereas a plastic horn of the same shape will not. A wood horn will probably be even more well damped. It all depends on the material, its hardness and internal stresses, damping, bracing, etc.