Thanks for the positive feedback on the horh work. It represents a first pass through and there are many areas I want to expand and dig in a little bit deeper. The room boundary and room interaction is just one topic. I am going to program the math in MathCad and also use some ANSYS acoustic simulations to get the wave plots you describe coming from the code you use for horns. The ANSYS FEM should help correlate the MathCad work (I am gettign ready with the following explanation at work : "No boss, our new superconducting magnet design really does look like a horn.").

Thanks again,

Martin