Re: FIR filters
Ah ... drum head behaviour, it's a worry but I still remember this from Uni mathematics :-/
.... It can be described by the solution of a second order partial differential equation with the appropriate boundary conditions - wave equation. There are some cool animations on the web.
To me the easiest way to see where cone or diaphragm break is occuring is where the smooth-ish frequency response becomes at bit ragged. For a cone driver the directivity also narrows as the center of the speaker decouples (sort of) from the outer parts of the cone. With a compression driver the wave front shape is usually compromised.
There are lots of things that contribe to distortion - the linear behaviour of the motor, the suspension, cone breakup, resonances etc.
Im not a speaker designer either .... So if anyone can correct me or add some information please do so.
