ive ran out of screws,20 short :P ,it makes Some bass- with no glue and just screws holding it :-DIve finished tech for the year.We went as far as reactive circuits and then moved onto real and imaginary power etc
I did see the acoustical impedence curves.and had a discussion at Cornus horn forum about it with the quarter-wave.com guy i think.
Its nice to know that you can model mechanical filters closely,with electrical ones :-)
Cheers