Herman - You have posted this already - or someone has - I remember looking at it.
Here's an explanation as to why I use my megaphone:
http://www.acoustichorn.com/tech/conical-horn-geometry/
I would urge everyone who has a genuine interest in this topic to read the explanation offered in the above link.
Here's an explanation as to why I use my megaphone:
http://www.acoustichorn.com/tech/conical-horn-geometry/
I would urge everyone who has a genuine interest in this topic to read the explanation offered in the above link.