Acoustic speaker for cell phone

[vinyljan]

Thinking of doing something for fun for my small workshop.  Any ideas?  Curved edges might be difficult to draw.....or not .  Some small folded horns look interesting, but finicky to build and I don't want to spend too much time on it.



Pic is from a Youtube vid.

[PsyCLown]

That is a pretty cool idea, I would like to see what you come up with and how much of a difference it makes.